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MALPEDIA_Win_Ketrum_Auto

autogenerated rule brought to you by yara-signator

MalwareKetrumMalpedia signator rulesCreative Commons Attribution-ShareAlike 4.0Compiles with YARA-X
Author
Felix Bilstein - yara-signator at cocacoding dot com
Date
2026-05-04
Modified
2026-05-18
Score / Quality
75 / 75

What this rule detects

autogenerated rule brought to you by yara-signator

Associated malware family: Ketrum.

It defines 16 patterns (0 text, 16 hex, 0 regex).

Summary generated from the rule's metadata and condition.

Rule source

win-ketrum-auto.yarCreative Commons Attribution-ShareAlike 4.0
rule MALPEDIA_Win_Ketrum_Auto : FILE
{
	meta:
		description = "autogenerated rule brought to you by yara-signator"
		author = "Felix Bilstein - yara-signator at cocacoding dot com"
		id = "34dfc7f1-3388-5508-be93-54df608c7b6f"
		date = "2026-05-04"
		modified = "2026-05-18"
		reference = "https://malpedia.caad.fkie.fraunhofer.de/details/win.ketrum"
		source_url = "https://github.com/malpedia/signator-rules//blob/c901f97b7df03e41917da74c2a84b04c227316c2/rules/win.ketrum_auto.yar#L1-L168"
		license_url = "N/A"
		logic_hash = "a40464d91af1dd1635901962dcdc758cf799db87ab42c7b659961a1c1df8820e"
		score = 75
		quality = 75
		tags = "FILE"
		version = "1"
		tool = "yara-signator v0.6.0"
		signator_config = "callsandjumps;datarefs;binvalue"
		malpedia_rule_date = "20260422"
		malpedia_hash = "a182e35da64e6d71cb55f125c4d4225196523f14"
		malpedia_version = "20260504"
		malpedia_license = "CC BY-SA 4.0"
		malpedia_sharing = "TLP:WHITE"

	strings:
		$sequence_0 = { 7e0d 33db 53 53 }
		$sequence_1 = { 8818 8816 8a00 02c2 8b55f8 0fb6c0 }
		$sequence_2 = { 8bfe 33db 897de0 895de8 }
		$sequence_3 = { b8???????? ffb5e8cbffff 68???????? ffb5f4cbffff 68???????? ffb5f8cbffff }
		$sequence_4 = { ffb5f0cbffff ff15???????? ffb5f0cbffff ff15???????? ffb5e8cbffff ffb5f4cbffff ffb5f8cbffff }
		$sequence_5 = { 50 e8???????? 50 e8???????? 83c420 ff35???????? ff05???????? }
		$sequence_6 = { 53 53 68???????? 6a03 eb04 53 53 }
		$sequence_7 = { ff15???????? 8bf8 3bfb 0f8670020000 }
		$sequence_8 = { 8b8510efffff 8b8d0cefffff 2bc1 6a1c 99 5e }
		$sequence_9 = { e8???????? 8d4dc4 c745c802000000 e8???????? 84c0 753f }
		$sequence_10 = { 75e6 c6460401 830eff 2b34bd20174800 c1fe06 8bc7 }
		$sequence_11 = { 59 8b83ac000000 be00280000 33ff }
		$sequence_12 = { 50 898d24efffff ffd7 8bf0 }
		$sequence_13 = { 33ff 8d742414 e8???????? 833d????????01 7507 e8???????? }
		$sequence_14 = { 0f95c0 e8???????? c20800 b8???????? c3 }
		$sequence_15 = { 8b4508 897708 83781c00 7510 }

	condition:
		7 of them and filesize < 4599808
}

Strings (16 patterns)

IdentifierTypeValueModifiers
$sequence_0hex{ 7e0d 33db 53 53 }
$sequence_1hex{ 8818 8816 8a00 02c2 8b55f8 0fb6c0 }
$sequence_2hex{ 8bfe 33db 897de0 895de8 }
$sequence_3hex{ b8???????? ffb5e8cbffff 68???????? ffb5f4cbffff 68???????? ffb5f8cbffff }
$sequence_4hex{ ffb5f0cbffff ff15???????? ffb5f0cbffff ff15???????? ffb5e8cbffff ffb5f4cbffff ffb5f8cbffff }
$sequence_5hex{ 50 e8???????? 50 e8???????? 83c420 ff35???????? ff05???????? }
$sequence_6hex{ 53 53 68???????? 6a03 eb04 53 53 }
$sequence_7hex{ ff15???????? 8bf8 3bfb 0f8670020000 }
$sequence_8hex{ 8b8510efffff 8b8d0cefffff 2bc1 6a1c 99 5e }
$sequence_9hex{ e8???????? 8d4dc4 c745c802000000 e8???????? 84c0 753f }
$sequence_10hex{ 75e6 c6460401 830eff 2b34bd20174800 c1fe06 8bc7 }
$sequence_11hex{ 59 8b83ac000000 be00280000 33ff }
$sequence_12hex{ 50 898d24efffff ffd7 8bf0 }
$sequence_13hex{ 33ff 8d742414 e8???????? 833d????????01 7507 e8???????? }
$sequence_14hex{ 0f95c0 e8???????? c20800 b8???????? c3 }
$sequence_15hex{ 8b4508 897708 83781c00 7510 }

Condition

7 of them and filesize < 4599808

In plain words (Heuristic)

  • The file must be smaller than 4599808 (a cheap guard that skips large files).
  • At least 7 patterns in the rule must match.

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References

Licence & attribution

Author: Felix Bilstein - yara-signator at cocacoding dot com

Source repository: Malpedia signator rules @ c901f97b7d

Licence: Creative Commons Attribution-ShareAlike 4.0 (repository licence)

Original rule

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

Rule id: 34dfc7f1-3388-5508-be93-54df608c7b6f

Metadata

version1
toolyara-signator v0.6.0
signator_configcallsandjumps;datarefs;binvalue
malpedia_rule_date20260422
malpedia_hasha182e35da64e6d71cb55f125c4d4225196523f14
malpedia_version20260504
malpedia_licenseCC BY-SA 4.0
malpedia_sharingTLP:WHITE

Tags:FILE