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MALPEDIA_Win_Vskimmer_Auto

autogenerated rule brought to you by yara-signator

MalwareVskimmerMalpedia 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: Vskimmer.

It defines 10 patterns (0 text, 10 hex, 0 regex).

Summary generated from the rule's metadata and condition.

Rule source

win-vskimmer-auto.yarCreative Commons Attribution-ShareAlike 4.0
rule MALPEDIA_Win_Vskimmer_Auto : FILE
{
	meta:
		description = "autogenerated rule brought to you by yara-signator"
		author = "Felix Bilstein - yara-signator at cocacoding dot com"
		id = "aa40e705-b39d-58b0-8775-3b56bc47a736"
		date = "2026-05-04"
		modified = "2026-05-18"
		reference = "https://malpedia.caad.fkie.fraunhofer.de/details/win.vskimmer"
		source_url = "https://github.com/malpedia/signator-rules//blob/c901f97b7df03e41917da74c2a84b04c227316c2/rules/win.vskimmer_auto.yar#L1-L125"
		license_url = "N/A"
		logic_hash = "f25f3f6146e6b91dd03692618e8cb587f926d46f49faa026e8804368e3ca4b7b"
		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 = { 895dfc e8???????? 6a01 e8???????? 83c420 53 6a01 }
		$sequence_1 = { 47 3810 751f ebe7 3b7d18 }
		$sequence_2 = { 53 8b1f 8d4301 56 8b7508 8945f8 8b4614 }
		$sequence_3 = { 85c0 0f84ba000000 57 8b3d???????? 8d45ec 50 }
		$sequence_4 = { ff15???????? 50 ff15???????? 8d45cc 50 68???????? 6a00 }
		$sequence_5 = { 3bf3 7408 8b451c 8906 897e14 }
		$sequence_6 = { 59 50 57 68???????? 8d8d38f7ffff e8???????? ffb5c4f6ffff }
		$sequence_7 = { 836df804 83c604 3b45f4 0f8253ffffff }
		$sequence_8 = { 6a01 8d8dc8fcffff e8???????? e8???????? c3 6a08 }
		$sequence_9 = { 751c 85c9 7508 c70703000000 eb37 83f901 7504 }

	condition:
		7 of them and filesize < 376832
}

Strings (10 patterns)

IdentifierTypeValueModifiers
$sequence_0hex{ 895dfc e8???????? 6a01 e8???????? 83c420 53 6a01 }
$sequence_1hex{ 47 3810 751f ebe7 3b7d18 }
$sequence_2hex{ 53 8b1f 8d4301 56 8b7508 8945f8 8b4614 }
$sequence_3hex{ 85c0 0f84ba000000 57 8b3d???????? 8d45ec 50 }
$sequence_4hex{ ff15???????? 50 ff15???????? 8d45cc 50 68???????? 6a00 }
$sequence_5hex{ 3bf3 7408 8b451c 8906 897e14 }
$sequence_6hex{ 59 50 57 68???????? 8d8d38f7ffff e8???????? ffb5c4f6ffff }
$sequence_7hex{ 836df804 83c604 3b45f4 0f8253ffffff }
$sequence_8hex{ 6a01 8d8dc8fcffff e8???????? e8???????? c3 6a08 }
$sequence_9hex{ 751c 85c9 7508 c70703000000 eb37 83f901 7504 }

Condition

7 of them and filesize < 376832

In plain words (Heuristic)

  • The file must be smaller than 376832 (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: aa40e705-b39d-58b0-8775-3b56bc47a736

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