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EMBEERESEARCH_Win_Pikabot_Loader_Bytecodes_Oct_2023

Detects bytecodes in recent PikaBot Loaders

MalwarePikabotEmbee ResearchDetection Rule License 1.1Compiles with YARA-X
Author
Matthew @ Embee_Research
Date
2023-10-03
Modified
2023-10-08
Score / Quality
75 / 75

What this rule detects

Detects bytecodes in recent PikaBot Loaders

Associated malware family: Pikabot.

It defines 3 patterns (0 text, 3 hex, 0 regex).

Summary generated from the rule's metadata and condition.

Rule source

Download .yar
win-pikabot-loader-bytecodes-oct-2023.yarDetection Rule License 1.1
rule EMBEERESEARCH_Win_Pikabot_Loader_Bytecodes_Oct_2023
{
	meta:
		description = "Detects bytecodes in recent PikaBot Loaders"
		author = "Matthew @ Embee_Research"
		id = "c15b9390-1d20-5325-81c3-c6cf59ffb21f"
		date = "2023-10-03"
		modified = "2023-10-08"
		reference = "https://github.com/embee-research/Yara-detection-rules/"
		source_url = "https://github.com/embee-research/Yara-detection-rules//blob/ac56d6f6fd2a30c8cb6e5c0455d6519210a8b0f4/Rules/win_pikabot_loader_bytecodes_oct_2023.yar#L3-L24"
		license_url = "N/A"
		hash = "778b6797bb9c9d2f868d3faaaf6b36ce3f06178c133bb592c5345c95ffb034a9"
		hash = "e26d44d740b4edbd37fa6196dcc9171e49e711d8ce64f67aae36c4299e352108"
		hash = "2d212cacc4767ef4383bdf462a9bb8aaf87f0b3c55b4c2f4a47c97c710ec1cd8"
		logic_hash = "a078df39fda5ab6f432c4bf42fb61bdf106386d9684188189e3cea81803b3952"
		score = 75
		quality = 75
		tags = ""

	strings:
		$s1 = { 8b 59 64 a1 58 00 ?? ?? 8b 8e d0 00 00 00 2b c1 2d d9 f1 3e 41 0f af da 09 46 20 a1 34 dd ?? ?? 8b d3 2b 88 a0 00 00 00 2b 0d bc ff ?? ?? 81}
		$s2 = { 88 14 08 8b cb 8b 15 a0 6a ?? ?? 42 c1 e9 08 89 15 a0 6a ?? ?? 8b 46 20 2b 05 ec 6a ?? ?? 05 ae 49 08 00}
		$s3 = { 03 d8 43 a1 d4 8e ?? ?? 33 18 89 1d 18 8f ?? ?? a1 d4 8e ?? ?? 8b 15 18 8f ?? ?? 89 10 8b 45 f8 83 c0 04 89 45 f8 33 c0 a3 14 8f ?? ?? a1 d4 8e ?? ?? 83 c0 04 03 05 14 8f ?? ?? a3 d4 8e ?? ?? 8b 45 f8 3b 05 e0 8e ?? ?? }

	condition:
		$s1 or $s2 or $s3
}

Strings (3 patterns)

IdentifierTypeValueModifiers
$s1hex{ 8b 59 64 a1 58 00 ?? ?? 8b 8e d0 00 00 00 2b c1 2d d9 f1 3e 41 0f af da 09 46 20 a1 34 dd ?? ?? 8b d3 2b 88 a0 00 00 00 2b 0d bc ff ?? ?? 81}
$s2hex{ 88 14 08 8b cb 8b 15 a0 6a ?? ?? 42 c1 e9 08 89 15 a0 6a ?? ?? 8b 46 20 2b 05 ec 6a ?? ?? 05 ae 49 08 00}
$s3hex{ 03 d8 43 a1 d4 8e ?? ?? 33 18 89 1d 18 8f ?? ?? a1 d4 8e ?? ?? 8b 15 18 8f ?? ?? 89 10 8b 45 f8 83 c0 04 89 45 f8 33 c0 a3 14 8f ?? ?? a1 d4 8e ?? ?? 83 c0 04 …

Condition

$s1 or $s2 or $s3

In plain words (Heuristic)

  • Pattern $s1 must be present.
  • Pattern $s2 must be present.
  • Pattern $s3 must be present.

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References

Sample hashes

Hashes of samples the author lists in the rule's meta (look them up in your threat-intelligence platform).

  • 778b6797bb9c9d2f868d3faaaf6b36ce3f06178c133bb592c5345c95ffb034a9
  • e26d44d740b4edbd37fa6196dcc9171e49e711d8ce64f67aae36c4299e352108
  • 2d212cacc4767ef4383bdf462a9bb8aaf87f0b3c55b4c2f4a47c97c710ec1cd8

Licence & attribution

Author: Matthew @ Embee_Research

Source repository: Embee Research @ ac56d6f6fd

Licence: Detection Rule License 1.1 (repository licence)

Original rule

Mirrored via YARA Forge 20260927, which prefixes rule names with the source and adds normalised meta fields.

Rule id: c15b9390-1d20-5325-81c3-c6cf59ffb21f

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