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DITEKSHEN_INDICATOR_KB_Gobuildid_Qnapcrypt

Detects Golang Build IDs in known bad samples

Suspicious / huntingQnapcryptditekSHen detectionBSD 2-Clause LicenseCompiles with YARA-X
Author
ditekSHen
Date
2021-01-21
Modified
2024-01-23
Score / Quality
75 / 75

What this rule detects

Detects Golang Build IDs in known bad samples

Associated malware family: Qnapcrypt.

Targets: Windows PE.

It defines 1 patterns (1 text, 0 hex, 0 regex).

Summary generated from the rule's metadata and condition.

Rule source

Download .yar
indicator-kb-gobuildid-qnapcrypt.yarBSD 2-Clause License
rule DITEKSHEN_INDICATOR_KB_Gobuildid_Qnapcrypt : FILE
{
	meta:
		description = "Detects Golang Build IDs in known bad samples"
		author = "ditekSHen"
		id = "4cdea15f-d8fd-5720-ba25-eb60e9b0f9ce"
		date = "2021-01-21"
		modified = "2024-01-23"
		reference = "https://github.com/ditekshen/detection"
		source_url = "https://github.com/ditekshen/detection/blob/e76c93dcdedff04076380ffc60ea54e45b313635/yara/indicator_knownbad_id.yar#L1590-L1598"
		license_url = "https://github.com/ditekshen/detection/blob/e76c93dcdedff04076380ffc60ea54e45b313635/LICENSE.txt"
		logic_hash = "b3ee583c395701350c091041a72f988d1b5ae607b642b42152fcda29f9be63e2"
		score = 75
		quality = 75
		tags = "FILE"

	strings:
		$s1 = "Go build ID: \"XcBqbQohm7UevdYNABvs/2RcJz1616naXSRu2xvTX/b6F3Jt1-5WAIexSyzeun/MpHqs5fJA5G2D9gVuUCe\"" ascii

	condition:
		uint16( 0 ) == 0x5a4d and filesize < 8000KB and 1 of them
}

Strings (1 patterns)

IdentifierTypeValueModifiers
$s1text"Go build ID: \"XcBqbQohm7UevdYNABvs/2RcJz1616naXSRu2xvTX/b6F3Jt1-5WAIexSyzeun/MpHqs5fJA5G2D9gVuUCe\""ascii

Condition

uint16( 0 ) == 0x5a4d and filesize < 8000KB and 1 of them

In plain words (Heuristic)

  • The file must start with “MZ” — a Windows executable (PE).
  • The file must be smaller than 8000KB (a cheap guard that skips large files).
  • At least 1 patterns in the rule must match.

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References

Licence & attribution

Author: ditekSHen

Source repository: ditekSHen detection @ e76c93dcde

Licence: BSD 2-Clause License (repository licence)

Copyright notice: Copyright 2021 by ditekSHen (https://github.com/ditekshen/detection).

Original rule

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

Rule id: 4cdea15f-d8fd-5720-ba25-eb60e9b0f9ce

Tags:FILE

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