42 lines
1.8 KiB
Text
42 lines
1.8 KiB
Text
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/* requires YARA 3.11 */
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rule HKTL_CobaltStrike_SleepMask_Jul22 {
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meta:
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description = "Detects static bytes in Cobalt Strike 4.5 sleep mask function that are not obfuscated"
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author = "CodeX"
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date = "2022-07-04"
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reference = "https://codex-7.gitbook.io/codexs-terminal-window/blue-team/detecting-cobalt-strike/sleep-mask-kit-iocs"
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score = 80
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id = "d396ab0e-b584-5a7c-8627-5f318a20f9dd"
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strings:
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$sleep_mask = { 48 8B C4 48 89 58 08 48 89 68 10 48 89 70 18 48 89 78 20 45 33 DB 45 33 D2 33 FF 33 F6 48 8B E9 BB 03 00 00 00 85 D2 0F 84 81 00 00 00 0F B6 45 }
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condition:
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$sleep_mask
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}
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// This file contain Yara rule for opcodes which target CS version 4.9.1 and prior.
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// This yara target the Socks and Remote Connection functionality which cannot
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// be modified by an operator. These can only be modified by Fortra as it needs
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// changes to the source code. This detection was written to target leaked CS 4.9
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// versions, but has been tested backwards till v4.5.
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// This yara wont hit beacon.exe, it was written for the shellcode
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// This yara was specially crafted for the core (in-memory scans) which cannot be
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// avoided in way by an operator, making the malleability, UDRL or IAT hooking useless
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/* FR: rule caused 6490 false positives in our testing environment - cannot be used in the current form
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rule HKTL_CobaltStrike_CS_Core_Oct23 {
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meta:
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description = "Hunts for opcodes used in Cobaltstrike 4.9.1 and earlier"
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version = "0.1"
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author = "@ninjaparanoid"
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reference = "https://github.com/paranoidninja/Cobaltstrike-Detection/blob/main/cs49.yara"
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date = "2023-10-12"
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score = 75
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strings:
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$socks = { 49 8D 55 02 48 8D 4C 24 30 44 0F B7 F8 B8 FF 03 00 00 }
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$core = { 49 B9 01 01 01 01 01 01 01 01 49 0F AF D1 49 83 F8 40 }
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condition:
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1 of them
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}
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*/
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