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HARFANGLAB_Trr250801_Csharp_Downloader_Combined

Detects C# downloaders as likely leveraged by UNC1151, and observed between May and July 2025

MalwareHarfangLab IOCsNo licence (all rights reserved)Compiles with YARA-X
Author
HarfangLab
Date
2025-08-08
Modified
2026-05-18
Score / Quality
75 / 80

What this rule detects

Detects C# downloaders as likely leveraged by UNC1151, and observed between May and July 2025

Targets: Windows PE.

It defines 18 patterns (17 text, 1 hex, 0 regex).

Summary generated from the rule's metadata and condition.

Rule source

Rule text not reproduced

This rule comes from HarfangLab IOCs, which does not grant a licence to redistribute its rules (No licence (all rights reserved)). We show its metadata only. Read the original rule upstream:

View the rule on GitHubOpen the repository

Sample hashes

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

  • 559ee2fad8d16ecaa7be398022aa7aa1adbd8f8f882a34d934be9f90f6dcb90b
  • a2a2f0281eed6ec758130d2f2b2b5d4f578ac90605f7e16a07428316c9f6424e

Licence & attribution

Author: HarfangLab

Source repository: HarfangLab IOCs @ 3e2b674bf2

Licence: No licence (all rights reserved) (repository licence)

Original rule

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

Rule id: 8eb59b6e-281b-5e05-bf1c-c44542816cfc

Metadata

contextfile

Tags:FILE

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