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MALPEDIA_Win_Cryptbot_Auto

autogenerated rule brought to you by yara-signator

MalwareCryptbotMalpedia 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 / 73

What this rule detects

autogenerated rule brought to you by yara-signator

Associated malware family: Cryptbot.

It defines 31 patterns (0 text, 31 hex, 0 regex).

Summary generated from the rule's metadata and condition.

Rule source

win-cryptbot-auto.yarCreative Commons Attribution-ShareAlike 4.0
rule MALPEDIA_Win_Cryptbot_Auto : FILE
{
	meta:
		description = "autogenerated rule brought to you by yara-signator"
		author = "Felix Bilstein - yara-signator at cocacoding dot com"
		id = "9f454949-4119-5d54-89a8-d6d06774000f"
		date = "2026-05-04"
		modified = "2026-05-18"
		reference = "https://malpedia.caad.fkie.fraunhofer.de/details/win.cryptbot"
		source_url = "https://github.com/malpedia/signator-rules//blob/c901f97b7df03e41917da74c2a84b04c227316c2/rules/win.cryptbot_auto.yar#L1-L268"
		license_url = "N/A"
		logic_hash = "cc8457aa1a1b960f17f2261fdfd7a0ee15b56bbe03933482c6401c550f37f6a5"
		score = 75
		quality = 73
		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 = { 33c0 85ed 0f94c0 8be8 }
		$sequence_1 = { e8???????? 85c0 750f b955960100 e8???????? e9???????? }
		$sequence_2 = { e8???????? 84c0 7514 b800000002 }
		$sequence_3 = { e9???????? b944dc0000 e9???????? b964dc0000 e9???????? b95ddc0000 }
		$sequence_4 = { 33c0 eb0a b917d90000 e8???????? }
		$sequence_5 = { e8???????? 85c0 750c b961030200 e8???????? }
		$sequence_6 = { e8???????? 85c0 750e b9ca070200 }
		$sequence_7 = { eb0c b99fed0000 e8???????? 8907 }
		$sequence_8 = { 7424 807e4100 7404 33c0 5e c3 }
		$sequence_9 = { 7414 3c7a 7508 8b4610 803874 }
		$sequence_10 = { 1ac9 2403 80e110 8ad1 3c02 7509 }
		$sequence_11 = { 7422 8b4d00 8bd3 6a00 }
		$sequence_12 = { 744e 0fb74802 83e103 3bcb }
		$sequence_13 = { 7419 8b4218 3b4114 7211 }
		$sequence_14 = { 83caff 8bcf e8???????? 83caff }
		$sequence_15 = { 750d 83bed000000000 7504 c6461005 8bc7 5f }
		$sequence_16 = { 85c0 742c 8bd6 8bcb }
		$sequence_17 = { 8b5720 8bce e8???????? 8b5724 8bce }
		$sequence_18 = { 8b959cfeffff 8b85acfeffff 33c9 3808 }
		$sequence_19 = { 8b4d08 8b4910 8b19 89542404 }
		$sequence_20 = { 8b4d08 8b09 83c002 83d200 }
		$sequence_21 = { 8b958cfeffff 2bc2 8bb5a0feffff 03f0 }
		$sequence_22 = { 8b4d08 8b09 01f0 11fa 894178 }
		$sequence_23 = { 8b95a0feffff 6a00 6a00 8b08 }
		$sequence_24 = { 8b94b1f80f0000 8b45f4 8b7df8 0fb700 0fb73c97 663bc7 7232 }
		$sequence_25 = { 8b4d08 8b09 8b09 8b09 }
		$sequence_26 = { 8b4d08 8b09 8b896caf0600 8b9274af0600 }
		$sequence_27 = { 8b4d08 8b09 8901 c745e41b000000 }
		$sequence_28 = { 8b4d08 8b09 81c3fc030000 8b549a08 }
		$sequence_29 = { 8b4d08 8b4914 8b19 8954240c }
		$sequence_30 = { 8b959cfeffff 8bca 85d2 742a }

	condition:
		7 of them and filesize < 17138688
}

Strings (31 patterns)

IdentifierTypeValueModifiers
$sequence_0hex{ 33c0 85ed 0f94c0 8be8 }
$sequence_1hex{ e8???????? 85c0 750f b955960100 e8???????? e9???????? }
$sequence_2hex{ e8???????? 84c0 7514 b800000002 }
$sequence_3hex{ e9???????? b944dc0000 e9???????? b964dc0000 e9???????? b95ddc0000 }
$sequence_4hex{ 33c0 eb0a b917d90000 e8???????? }
$sequence_5hex{ e8???????? 85c0 750c b961030200 e8???????? }
$sequence_6hex{ e8???????? 85c0 750e b9ca070200 }
$sequence_7hex{ eb0c b99fed0000 e8???????? 8907 }
$sequence_8hex{ 7424 807e4100 7404 33c0 5e c3 }
$sequence_9hex{ 7414 3c7a 7508 8b4610 803874 }
$sequence_10hex{ 1ac9 2403 80e110 8ad1 3c02 7509 }
$sequence_11hex{ 7422 8b4d00 8bd3 6a00 }
$sequence_12hex{ 744e 0fb74802 83e103 3bcb }
$sequence_13hex{ 7419 8b4218 3b4114 7211 }
$sequence_14hex{ 83caff 8bcf e8???????? 83caff }
$sequence_15hex{ 750d 83bed000000000 7504 c6461005 8bc7 5f }
$sequence_16hex{ 85c0 742c 8bd6 8bcb }
$sequence_17hex{ 8b5720 8bce e8???????? 8b5724 8bce }
$sequence_18hex{ 8b959cfeffff 8b85acfeffff 33c9 3808 }
$sequence_19hex{ 8b4d08 8b4910 8b19 89542404 }
$sequence_20hex{ 8b4d08 8b09 83c002 83d200 }
$sequence_21hex{ 8b958cfeffff 2bc2 8bb5a0feffff 03f0 }
$sequence_22hex{ 8b4d08 8b09 01f0 11fa 894178 }
$sequence_23hex{ 8b95a0feffff 6a00 6a00 8b08 }
$sequence_24hex{ 8b94b1f80f0000 8b45f4 8b7df8 0fb700 0fb73c97 663bc7 7232 }
$sequence_25hex{ 8b4d08 8b09 8b09 8b09 }
$sequence_26hex{ 8b4d08 8b09 8b896caf0600 8b9274af0600 }
$sequence_27hex{ 8b4d08 8b09 8901 c745e41b000000 }
$sequence_28hex{ 8b4d08 8b09 81c3fc030000 8b549a08 }
$sequence_29hex{ 8b4d08 8b4914 8b19 8954240c }
$sequence_30hex{ 8b959cfeffff 8bca 85d2 742a }

Condition

7 of them and filesize < 17138688

In plain words (Heuristic)

  • The file must be smaller than 17138688 (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: 9f454949-4119-5d54-89a8-d6d06774000f

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