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MALPEDIA_Win_Stealer_0X3401_Auto

autogenerated rule brought to you by yara-signator

MalwareStealer 0X3401Malpedia 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: Stealer 0X3401.

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

Summary generated from the rule's metadata and condition.

Rule source

win-stealer-0x3401-auto.yarCreative Commons Attribution-ShareAlike 4.0
rule MALPEDIA_Win_Stealer_0X3401_Auto : FILE
{
	meta:
		description = "autogenerated rule brought to you by yara-signator"
		author = "Felix Bilstein - yara-signator at cocacoding dot com"
		id = "c3a754bd-df85-5443-a989-e577888f5f8f"
		date = "2026-05-04"
		modified = "2026-05-18"
		reference = "https://malpedia.caad.fkie.fraunhofer.de/details/win.stealer_0x3401"
		source_url = "https://github.com/malpedia/signator-rules//blob/c901f97b7df03e41917da74c2a84b04c227316c2/rules/win.stealer_0x3401_auto.yar#L1-L131"
		license_url = "N/A"
		logic_hash = "a0c2640511ace27c59577cc0f7a5154040435b7300f76db857b3e86a8af1af06"
		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 = { e8???????? c745fcffffffff 8b45bc 83f810 7242 8b4da8 40 }
		$sequence_1 = { 8b8510ffffff 85c0 7473 50 8d4dbc e8???????? 8bd0 }
		$sequence_2 = { 8bc8 51 e8???????? 83c404 6a54 68???????? }
		$sequence_3 = { 68???????? b9???????? e8???????? e9???????? 83fe03 0f87e3000000 ff24b55c3e0010 }
		$sequence_4 = { 8b06 894714 c70607000000 833e08 c746fc00000000 7205 8b46ec }
		$sequence_5 = { 731f 8bc1 83e13f c1f806 6bc930 8b0485c8710210 f644082801 }
		$sequence_6 = { c745e800000000 668945d8 663902 741d 8bc2 8d7802 }
		$sequence_7 = { c745fc04000000 e8???????? 8b45a4 83f810 7242 8b4d90 }
		$sequence_8 = { 50 8d45f4 64a300000000 8d8580fdffff c7857cfdffff00000000 50 ff15???????? }
		$sequence_9 = { c70300000000 8b4310 894610 8b4314 894614 c7431407000000 837b1408 }

	condition:
		7 of them and filesize < 357376
}

Strings (10 patterns)

IdentifierTypeValueModifiers
$sequence_0hex{ e8???????? c745fcffffffff 8b45bc 83f810 7242 8b4da8 40 }
$sequence_1hex{ 8b8510ffffff 85c0 7473 50 8d4dbc e8???????? 8bd0 }
$sequence_2hex{ 8bc8 51 e8???????? 83c404 6a54 68???????? }
$sequence_3hex{ 68???????? b9???????? e8???????? e9???????? 83fe03 0f87e3000000 ff24b55c3e0010 }
$sequence_4hex{ 8b06 894714 c70607000000 833e08 c746fc00000000 7205 8b46ec }
$sequence_5hex{ 731f 8bc1 83e13f c1f806 6bc930 8b0485c8710210 f644082801 }
$sequence_6hex{ c745e800000000 668945d8 663902 741d 8bc2 8d7802 }
$sequence_7hex{ c745fc04000000 e8???????? 8b45a4 83f810 7242 8b4d90 }
$sequence_8hex{ 50 8d45f4 64a300000000 8d8580fdffff c7857cfdffff00000000 50 ff15???????? }
$sequence_9hex{ c70300000000 8b4310 894610 8b4314 894614 c7431407000000 837b1408 }

Condition

7 of them and filesize < 357376

In plain words (Heuristic)

  • The file must be smaller than 357376 (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: c3a754bd-df85-5443-a989-e577888f5f8f

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