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[pull] master from Neo23x0:master #142

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Merged
pull merged 2 commits into from
May 26, 2026
Merged

[pull] master from Neo23x0:master #142

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a33f158
fix: fps with MRT
Neo23x0 May 26, 2026
c6cd902
fix: fps with MRT
Neo23x0 May 26, 2026
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12 changes: 7 additions & 5 deletions yara/apt_cobaltstrike.yar
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Original file line number Diff line number Diff line change
Expand Up @@ -72,6 +72,7 @@ rule HKTL_CobaltStrike_Beacon_XOR_Strings {
description = "Identifies XOR'd strings used in Cobalt Strike Beacon DLL"
reference = "https://www.elastic.co/blog/detecting-cobalt-strike-with-memory-signatures"
date = "2021-03-16"
modified = "2026-05-26"
/* Used for beacon config decoding in THOR */
xor_s1 = "%02d/%02d/%02d %02d:%02d:%02d"
xor_s2 = "Started service %s on %s"
Expand All @@ -82,7 +83,8 @@ rule HKTL_CobaltStrike_Beacon_XOR_Strings {
$s2 = "Started service %s on %s" xor(0x01-0xff)
$s3 = "%s as %s\\%s: %d" xor(0x01-0xff)

$fp1 = "MalwareRemovalTool"
$fp1 = "MalwareRemovalTool" ascii wide
$fp2 = "advanced malware removal tool" ascii wide
condition:
2 of ($s*) and not 1 of ($fp*)
}
Expand All @@ -95,13 +97,13 @@ rule HKTL_CobaltStrike_Beacon_4_2_Decrypt {
date = "2021-03-16"
id = "63b71eef-0af5-5765-b957-ccdc9dde053b"
strings:
$a_x64 = {4C 8B 53 08 45 8B 0A 45 8B 5A 04 4D 8D 52 08 45 85 C9 75 05 45 85 DB 74 33 45 3B CB 73 E6 49 8B F9 4C 8B 03}
$a_x86 = {8B 46 04 8B 08 8B 50 04 83 C0 08 89 55 08 89 45 0C 85 C9 75 04 85 D2 74 23 3B CA 73 E6 8B 06 8D 3C 08 33 D2}
$a_x64 = { 4C 8B 53 08 45 8B 0A 45 8B 5A 04 4D 8D 52 08 45 85 C9 75 05 45 85 DB 74 33 45 3B CB 73 E6 49 8B F9 4C 8B 03 }
$a_x86 = { 8B 46 04 8B 08 8B 50 04 83 C0 08 89 55 08 89 45 0C 85 C9 75 04 85 D2 74 23 3B CA 73 E6 8B 06 8D 3C 08 33 D2 }
condition:
any of them
}

rule HKTL_Win_CobaltStrike : Commodity {
rule HKTL_Win_CobaltStrike: Commodity {
meta:
author = "threatintel@volexity.com"
date = "2021-05-25"
Expand All @@ -111,7 +113,7 @@ rule HKTL_Win_CobaltStrike : Commodity {
id = "113ba304-261f-5c59-bc56-57515c239b6d"
strings:
$s1 = "%s (admin)" fullword
$s2 = {48 54 54 50 2F 31 2E 31 20 32 30 30 20 4F 4B 0D 0A 43 6F 6E 74 65 6E 74 2D 54 79 70 65 3A 20 61 70 70 6C 69 63 61 74 69 6F 6E 2F 6F 63 74 65 74 2D 73 74 72 65 61 6D 0D 0A 43 6F 6E 74 65 6E 74 2D 4C 65 6E 67 74 68 3A 20 25 64 0D 0A 0D 0A 00}
$s2 = { 48 54 54 50 2F 31 2E 31 20 32 30 30 20 4F 4B 0D 0A 43 6F 6E 74 65 6E 74 2D 54 79 70 65 3A 20 61 70 70 6C 69 63 61 74 69 6F 6E 2F 6F 63 74 65 74 2D 73 74 72 65 61 6D 0D 0A 43 6F 6E 74 65 6E 74 2D 4C 65 6E 67 74 68 3A 20 25 64 0D 0A 0D 0A 00 }
$s3 = "%02d/%02d/%02d %02d:%02d:%02d" fullword
$s4 = "%s as %s\\%s: %d" fullword
$s5 = "%s&%s=%s" fullword
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