YARA · Malpedia signator rules
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:
= "autogenerated rule brought to you by yara-signator"
= "Felix Bilstein - yara-signator at cocacoding dot com"
= "9f454949-4119-5d54-89a8-d6d06774000f"
= "2026-05-04"
= "2026-05-18"
= "https://malpedia.caad.fkie.fraunhofer.de/details/win.cryptbot"
= "https://github.com/malpedia/signator-rules//blob/c901f97b7df03e41917da74c2a84b04c227316c2/rules/win.cryptbot_auto.yar#L1-L268"
= "N/A"
= "cc8457aa1a1b960f17f2261fdfd7a0ee15b56bbe03933482c6401c550f37f6a5"
= 75
= 73
= "FILE"
= "1"
= "yara-signator v0.6.0"
= "callsandjumps;datarefs;binvalue"
= "20260422"
= "a182e35da64e6d71cb55f125c4d4225196523f14"
= "20260504"
= "CC BY-SA 4.0"
= "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)
| Identifier | Type | Value | Modifiers |
|---|---|---|---|
| $sequence_0 | hex | { 33c0 85ed 0f94c0 8be8 } | |
| $sequence_1 | hex | { e8???????? 85c0 750f b955960100 e8???????? e9???????? } | |
| $sequence_2 | hex | { e8???????? 84c0 7514 b800000002 } | |
| $sequence_3 | hex | { e9???????? b944dc0000 e9???????? b964dc0000 e9???????? b95ddc0000 } | |
| $sequence_4 | hex | { 33c0 eb0a b917d90000 e8???????? } | |
| $sequence_5 | hex | { e8???????? 85c0 750c b961030200 e8???????? } | |
| $sequence_6 | hex | { e8???????? 85c0 750e b9ca070200 } | |
| $sequence_7 | hex | { eb0c b99fed0000 e8???????? 8907 } | |
| $sequence_8 | hex | { 7424 807e4100 7404 33c0 5e c3 } | |
| $sequence_9 | hex | { 7414 3c7a 7508 8b4610 803874 } | |
| $sequence_10 | hex | { 1ac9 2403 80e110 8ad1 3c02 7509 } | |
| $sequence_11 | hex | { 7422 8b4d00 8bd3 6a00 } | |
| $sequence_12 | hex | { 744e 0fb74802 83e103 3bcb } | |
| $sequence_13 | hex | { 7419 8b4218 3b4114 7211 } | |
| $sequence_14 | hex | { 83caff 8bcf e8???????? 83caff } | |
| $sequence_15 | hex | { 750d 83bed000000000 7504 c6461005 8bc7 5f } | |
| $sequence_16 | hex | { 85c0 742c 8bd6 8bcb } | |
| $sequence_17 | hex | { 8b5720 8bce e8???????? 8b5724 8bce } | |
| $sequence_18 | hex | { 8b959cfeffff 8b85acfeffff 33c9 3808 } | |
| $sequence_19 | hex | { 8b4d08 8b4910 8b19 89542404 } | |
| $sequence_20 | hex | { 8b4d08 8b09 83c002 83d200 } | |
| $sequence_21 | hex | { 8b958cfeffff 2bc2 8bb5a0feffff 03f0 } | |
| $sequence_22 | hex | { 8b4d08 8b09 01f0 11fa 894178 } | |
| $sequence_23 | hex | { 8b95a0feffff 6a00 6a00 8b08 } | |
| $sequence_24 | hex | { 8b94b1f80f0000 8b45f4 8b7df8 0fb700 0fb73c97 663bc7 7232 } | |
| $sequence_25 | hex | { 8b4d08 8b09 8b09 8b09 } | |
| $sequence_26 | hex | { 8b4d08 8b09 8b896caf0600 8b9274af0600 } | |
| $sequence_27 | hex | { 8b4d08 8b09 8901 c745e41b000000 } | |
| $sequence_28 | hex | { 8b4d08 8b09 81c3fc030000 8b549a08 } | |
| $sequence_29 | hex | { 8b4d08 8b4914 8b19 8954240c } | |
| $sequence_30 | hex | { 8b959cfeffff 8bca 85d2 742a } |
Condition
7 of them and filesize < 17138688In 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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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)
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
| 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 |
Tags:FILE
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