(YARA) YARA_XOR_Hunt

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rule XOR_hunt
{
  meta:
    author = "Thomas Roccia | @fr0gger_"
    description = "100DaysOfYara - An attempt to catch malicious/suspicious pe file using xor for some data"
    status = "experimental"

  strings:
    $s1 = "http://" xor
    $s2 = "https://" xor
    $s3 = "ftp://" xor
    $s4 = "This program cannot be run in DOS mode" xor
    $s5 = "Mozilla/5.0" xor
    $s6 = "cmd /c" xor
    $s7 = "-ep bypass" xor

  condition:
     uint16(0) == 0x5A4D and any of them
}

Associated Techniques

Technique Name Technique ID's Snippet(s) OS
XOR Operation U0701 E1027.m02

Matching Samples 10 most recent

Sample Name Matching Techniques First Seen Last Seen
koi.exe 4 2026-01-31 1 day, 12 hours ago
FXL Tweaks.exe 3 2026-01-30 1 day, 17 hours ago
x64_AcroCEF.exe 5 2026-01-30 2 days, 14 hours ago
x64_Acrobat.exe 9 2026-01-30 2 days, 14 hours ago
x64_Acrobat.exe 9 2026-01-30 2 days, 14 hours ago
ClipGuard.exe 5 2026-01-29 3 days, 8 hours ago
1c0000.dll 8 2026-01-27 5 days ago
loader_complete.exe 10 2026-01-27 5 days ago
UMLoader.dll 7 2026-01-27 5 days, 8 hours ago
UMLoader.dll 4 2026-01-27 5 days, 8 hours ago
View All

Created

January 4, 2024

Last Revised

January 4, 2024