ZloaderXLS
YARA-2025-0915
Medium
general
Active
No description available for this rule
ZloaderXLS.yar
Valid Syntax
/*
Zloader detection - this file is free for commerical use and basis for product detection
*/
//import "vt"
rule ZloaderXLS
{
strings:
$0 = {B9202CEDF8B56B55DFC369C04292461DFFC168F0C975DF1312A521A22CC51D7F8E857F73F7E38F6EA01D19E3047B609F8A1DD4F16329B39D4A4504308CC43596E114EE4D184F90844B1E55428E4EC06F422B5BD56AB3922092FA5E8A12707B77322101F646CAA5BFBB70DEA770994AA10602CA87CA35B62C34369CD61442CC459772EF18D18E0FF384EC64849F48DFA34848B8D1F1ABFACFAFECDEA8A09DC288CA0DB686DD40FF1576854138DDD273F2685C4E5AAF}
$1 = {457863656C20342E30204D6163726F73}
condition:
all of them
}
rule ZloaderXLSBehavior
{
strings:
$0 = {992416C9D8B2A755FBF74CD25442A820166C2CD933F79E3BE372BD1F07B5C3989CA74AAFF2422B24EB1B475DA5DF374FD9AD5689811A183C61A50F98F4BABEBC2837878049899A52A57BE670674CB23D8E90721F90A4D2FA3802CB35762680FD800ECD7551DC18EB899138E3C943D7E503B6B01D583DEEE5F99824E290B4BA3F364EAC4A430883B3C092D4ECA8F946C916422ECAB927F52EA42B89A1CD59C254F919B0E85E6535D135A8DE20F20B8C12C3B00C895FCF6720192DE6BF3B9E89ECDBD6596CBCDD8EB28E7C365ECC4EC1FF1460F53FE813}
$1 = {457863656C20342E30204D6163726F73}
condition:
all of them
}
rule ZloaderDLL
{
strings:
$0 = {C69CB5F9A703F54F601B4FDDA36E5AD1279DFE0EFD19444FE10498F2601BAD0C691BF4D04AC15E5060A4EE813B9DE29FAA1BF4D82E9FDA53D534AFED291CF4D85B82F52956F65F2263DCBE58C69CBB0380A4CB80705BD6254961F94F6021FA55669F8BEDFD271A2A3B9B75CEDFB0165D6CAB64B4C087F55364556D1B4AE9C41F27A389D1E019E04F4BB38BEBFE794CA9B847277394C0B9D1E51EAF4F5B8355B1C1DB4A99AE9E62D71FF412C6D6CFB9CAAEAE1DCCA9305AA9B7B03D75F1411B4B9DBD192B1EA3656853}
$1 = {C14B43BBDDE31693D6DCAC579F200F546C2006EE1BB74204B9800B667C7F5EDD31E467DB1B6D17929A0D6B8376733682F28C448CA3010FE39146B3E3D9D42F639F81699C634C65E60A837C10F4C028DD5865D0962EF2D350BC3BB0887460887D7CB4C7C925A840B5E51678147CE0F0F0A7A4C82C46E91C99DC6B1CD31DCF894E5EE1E1D816D97020289615F90CFDF72369BB4EC5F5C28860958E8E}
condition:
all of them
}
rule ZloaderDLLNew
{
strings:
$0 = {9CB5F9A703F54F601B4FDDA36E5AD1279DFE0EFD19444FE10498F2601BAD0C691BF4D04AC15E5060A4EE813B9DE29FAA1BF4D82E9FDA53D534AFED291CF4D85B82F52956F65F2263DCBE58C69CBB0380A4CB80705BD6254961F94F6021FA55669F8BEDFD271A2A3B9B75CEDFB0165D6CAB64B4C087F55364556D1B4AE9C41F27A389D1E019E04F4BB38BEBFE794CA9B847277394C0B9D1E51EAF4F5B8355B1C1DB4A99AE9E62D71FF412C6D6CFB9CAAEAE1DCCA9305AA9B7B03D75F1411B4B9DBD192B1EA365685336C7A984D634A3B3F05022B654EECD9876B103605B3BE7524FA0CECEF8F5BC3B9F76D46CE370378DDFE84454CD56F94528C3DB6CCF2234F546371A9C640A61094F3793A3D5F39B9B77F88D926E8D10E8DF0BC3AEA4CE5929DDD584462EEEB92E6A19B2428310C0BFBC}
condition:
all of them
}
rule ZloaderXLSInvoice
{
strings:
$0 = {FFCCFF06000E0005FF0000B2B2B2FF010007000E0005FF0000B2B2B2FF010008000E0005FF0000B2B2B2FF010009000E0005FF0000B2B2B2FF010093020B0039000600004F75747075749208770092080000}
$1 = {0206000E0005FF00007F7F7FFF010007000E0005FF00007F7F7FFF010008000E0005FF00007F7F7FFF010009000E0005FF00007F7F7FFF01009302100036000B00004C696E6B65642043656C6C92084B00920800}
$2 = {010312FF0900480065006100640069006E006700200033000000030005000C000703000044546AFF250005000207000E00070432338EA9DBFF020093020E00340009000048656164696E67203492083900920800000000000000}
$3 = {010311FF0900480065006100640069006E006700200032000000030005000C000703000044546AFF250005000207000E000704FF3FA2B8E1FF050093020E00330009000048656164696E67203392084700920800000000}
$4 = {0004AD20E00014000F000000F5FF200000941111970B970B00049620E000140011000000F5FF200000946666BF1FBF1F0004B720E000140005002B00F5FF200000F8}
$5 = {000004AB20E000140005000000F5FF2000009C1111160B160B00049A20E00014000E000000F5FF200000941111BF1FBF1F00049620E000140005000900F5FF20}
$6 = {00FF250005000206000E00070400004472C4FF010007000E00070400004472C4FF0600930211003D000C00005761726E696E67205465787492083F0092080000}
$7 = {003F3F3FFF010007000E0005FF00003F3F3FFF010008000E0005FF00003F3F3FFF010009000E0005FF00003F3F3FFF0100930204003A8005FF92082400920800}
$8 = {41646D696E6973747261746F722020202020202020202020202020202020202020202020202020202020202020202020202020202020202020202020202020202020202020}
condition:
all of them
}
rule ZloaderDLLFancy
{
strings:
$0 = {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}
$1 = {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}
$2 = {8B45E00BF78D3C023BF872043BFA73188D460133D23BC6720583F801730333D24285D28BF07401418B45C88D14303BD68955BC72043BD0730141034DCCC1EA1F03C90BCA8D343F8975E08B75BC894DE8C1E91803F680C1308BC7C1E81F0BF0880B}
$3 = {0064003D002200660061006C0073006500220020007600610072006900610062006C0065004C0065006E006700740068003D00220074007200750065002200200067006C006F006200620069006E0067003D002200660061006C00730065002200200070006900700065006C0069006E00650049006E007000750074003D002200660061006C00730065002200200070006F0073006900740069006F006E003D0022006E0061006D006500640022003E000D000A000900090009003C006D0061006D006C003A006E0061006D0065003E}
$4 = {002F006D0061006D006C003A006E0061006D0065003E000D000A0009000900090009003C006D0061006D006C003A0075007200690020002F003E000D000A0009000900090009003C006D0061006D006C003A006400650073006300720069007000740069006F006E0020002F003E000D000A000900090009003C002F006400650076003A0074007900700065003E}
$5 = {6685FF7D438BCFF7D90FB7F103FEF645D4017403FF45B08B4DDC8B5DD88B55D8D16DDCC1E11FD1EB0BD98B4DD4C1E21FD1E90BCA4E895DD8894DD475D1837DB000740566834DD40166817DD4008077118B4DD481E1FFFF0100}
$6 = {000D000A000900090009003C006D0061006D006C003A006400650073006300720069007000740069006F006E003E000D000A0009000900090009003C006D0061006D006C003A0070006100720061003E000D000A00090009000900090009003C0021002D002D0020006400650073006300720069007000740069006F006E00200020002D002D003E000D}
$7 = {F6FF751B8365F60066817DFAFFFF750966C745FA008040EB0E66FF45FAEB08FF45F6EB03FF45F2663DFF7F731C668B55F2668955E08B55F48955E28B55F80BC18955E6668945EAEB1C66F7D91BC98365E40081E1}
$8 = {55A48B75C003D285F68975B07E588D5415E08955A88B559C83C2088955AC8B55A88B75AC0FB7360FB7128B7FFC0FAFD6836590008D34173BF772043BF27307C74590010000}
$9 = {00008B55AC8B75C003D285F68975B07E528D75D88D5415E08975A48955B88B55A48B75B80FB7360FB7128365BC000FAFD68B70FC8D1C163BDE72043BDA7307C745BC01}
$10 = {E0F64518018B55A08B4DB466890A74320FBFC9014D143945147F276683220066817D940080C64203010F95C0FEC8240D0420884202C6420430C6420500E9AFF9FFFF}
$11 = {F80148088365EC008D0C3F8BD7C1EA1F8D3C1B0BFA8B50088BF3C1EE1F8D1C128B55080BDE89088978048958080FBE128D34113BF18955F072043BF27307C745EC01}
$12 = {0023C881E2FF7F00006685C9895DA0C645D0CCC645D1CCC645D2CCC645D3CCC645D4CCC645D5CCC645D6CCC645D7CCC645D8CCC645D9CCC645DAFBC645DB3FC7}
$13 = {8B4D988B55A803C985D289559C7E558D4C0DC483C308894DA4895DA08B4DA08B55A40FB7120FB709836588000FAFCA8B56FC8D1C0A3BDA72043BD97307C74588}
$14 = {55F88B7DF48B75F4D16DF8C1E21FD1EF0BFA8B55F0C1E61FD1EA0BD6FF4DBC897DF48955F075CF837DB800740566834DF00166817DF0008077118B55F081E2FF}
$15 = {83C10484D274523A51FC754D8A50FD84D2743C3A51FD75378A50FE84D274263A51FE75218A50FF84D274103A51FF750B8345FC04397DFC72C2EB3F0FB640FF0F}
$16 = {00894D947406C643022DEB04C64302206685D28B75F48B7DF0752E85F6752A85FF752666213B663BC80F95C0FEC8240D0420884302C6430301C6430430C64305}
$17 = {FFFF4B8A034B3C357D0E8B4DC0EB44803B397509C603304B3B5DC073F23B5DC08B45A073044366FF00FE032AD880EB030FBECB885803C6440104008B458C8B4D}
$18 = {4741497350726F636573736F724665617475726550726573656E74}
$19 = {446C6C52656769737465725365727665724030}
$20 = {496E7465726C6F636B656444656372656D656E74}
$21 = {496E7465726C6F636B6564496E6372656D656E74}
condition:
all of them
}
rule ZloaderWord
{
strings:
$0 = {3D170A6D23A3C814B363EAD1C976207D9A6D4D87CC2427276D04609ADD6102811789E92A3A7F25A96D3ACD2C129AC0E918BE3187E1A0B49C6C4446F11231B3F4}
condition:
all of them
}
String Definitions
{"name":"$0","value":"{B9202CEDF8B56B55DFC369C04292461DFFC168F0C975DF1312A521A22CC51D7F8E857F73F7E38F6EA01D19E3047B609F8A1DD4F16329B39D4A4504308CC43596E114EE4D184F90844B1E55428E4EC06F422B5BD56AB3922092FA5E8A12707B77322101F646CAA5BFBB70DEA770994AA10602CA87CA35B62C34369CD61442CC459772EF18D18E0FF384EC64849F48DFA34848B8D1F1ABFACFAFECDEA8A09DC288CA0DB686DD40FF1576854138DDD273F2685C4E5AAF}"}
{"name":"$1","value":"{457863656C20342E30204D6163726F73}"}
Threat Analysis
This YARA rule is designed to detect general threats.
Severity Level: Medium
The rule uses pattern matching to identify specific byte sequences, strings, or behavioral patterns associated with malicious activity.
Detection Capabilities
- File-based detection for executables and documents
- Memory scanning for running processes
- Network traffic analysis support
Command Line Usage
# Scan a single file yara ZloaderXLS.yar /path/to/suspicious/file # Scan a directory recursively yara -r ZloaderXLS.yar /path/to/directory/ # Scan with metadata output yara -m ZloaderXLS.yar target_file # Scan process memory (Linux) yara ZloaderXLS.yar /proc/[pid]/exe
Integration Examples
Python (yara-python)
import yara
rules = yara.compile(filepath='ZloaderXLS.yar')
matches = rules.match('/path/to/file')
ClamAV Integration
clamscan --yara-rules=ZloaderXLS.yar /path/to/scan
Rule Information
YARA ID
YARA-2025-0915
Author
Unknown
Repository
Created
August 19, 2025
Last Updated
August 19, 2025
Last Imported
Never
Threat Intelligence
Risk Level
Medium
Category
general
Detection Confidence
Analysis Pending
False Positive Rate
Not Available
Last Seen in Wild
No Data
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