YARA · Malpedia signator rules
MALPEDIA_Win_Retefe_Auto
autogenerated rule brought to you by yara-signator
- 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: Retefe.
It defines 30 patterns (0 text, 30 hex, 0 regex).
Summary generated from the rule's metadata and condition.
Rule source
win-retefe-auto.yarCreative Commons Attribution-ShareAlike 4.0
rule MALPEDIA_Win_Retefe_Auto : FILE
{
meta:
= "autogenerated rule brought to you by yara-signator"
= "Felix Bilstein - yara-signator at cocacoding dot com"
= "31200cc7-03b1-55f5-b69b-b9e36950bf28"
= "2026-05-04"
= "2026-05-18"
= "https://malpedia.caad.fkie.fraunhofer.de/details/win.retefe"
= "https://github.com/malpedia/signator-rules//blob/c901f97b7df03e41917da74c2a84b04c227316c2/rules/win.retefe_auto.yar#L1-L276"
= "N/A"
= "5b3eefe7ca9a8548d99314574f752a7999d6bd3b917149311736d19204ce71ad"
= 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 = { 51 8bf8 ffd6 85c0 }
$sequence_1 = { 68f5000000 50 ff15???????? b801000000 }
$sequence_2 = { 6a3b 6a95 6ae7 6a07 6a22 }
$sequence_3 = { 6a90 6a19 6ad6 6a2c 6ad3 6a13 }
$sequence_4 = { 50 8b4204 ffd0 8b85e8efffff 6a00 8d8ddcefffff 51 }
$sequence_5 = { 894604 83c404 8bc6 e8???????? }
$sequence_6 = { 8b450c 3978fc 7e10 8b40f4 }
$sequence_7 = { 6adb 6a52 6af1 6a72 6a8a 6a3f }
$sequence_8 = { 6a17 6a31 6a1b 6a24 6a5a 6a3d }
$sequence_9 = { e8???????? 6a08 e8???????? 894604 83c404 }
$sequence_10 = { 52 e8???????? 8b4e04 8901 }
$sequence_11 = { 8b4e04 40 3b4104 72ec }
$sequence_12 = { 8b4e04 8901 8b4e04 33c0 83c404 }
$sequence_13 = { 50 e8???????? 88043e 46 83c404 3bf3 75ec }
$sequence_14 = { 668908 8d85c4efffff bf???????? 50 }
$sequence_15 = { c745fcffffffff 8935???????? 8b06 51 8bfc }
$sequence_16 = { e8???????? 83a6a0bf420000 59 83c604 81fe00020000 72dd b001 }
$sequence_17 = { 756e 85d2 756a 8b3d???????? 8db7ff1f0000 }
$sequence_18 = { 83c001 89442414 0f8429010000 55 }
$sequence_19 = { 8d442410 50 ffd3 8b450c 2dd0070000 }
$sequence_20 = { 894c243c 8d48fd 83e10f 8d7007 }
$sequence_21 = { c70021000000 e9???????? 894ddc c745e008344100 e9???????? c745e004344100 }
$sequence_22 = { 40 83f81d 7cf1 eb07 8b0cc5fc3c4100 }
$sequence_23 = { 6bf030 03348da0bf4200 837e18ff 740c 837e18fe 7406 }
$sequence_24 = { f2c3 f2e953070000 53 56 57 6a00 68a00f0000 }
$sequence_25 = { 8364240400 56 57 8b7c2418 57 }
$sequence_26 = { 8bfe e9???????? 33db 33c0 }
$sequence_27 = { 0f87ed010000 ff24855c664000 ff36 68???????? 6a00 }
$sequence_28 = { 56 e8???????? 85c0 0f8425ffffff 56 }
$sequence_29 = { 83e03f c1ff06 6bd830 8b04bda0bf4200 }
condition:
7 of them and filesize < 843776
}
Strings (30 patterns)
| Identifier | Type | Value | Modifiers |
|---|---|---|---|
| $sequence_0 | hex | { 51 8bf8 ffd6 85c0 } | |
| $sequence_1 | hex | { 68f5000000 50 ff15???????? b801000000 } | |
| $sequence_2 | hex | { 6a3b 6a95 6ae7 6a07 6a22 } | |
| $sequence_3 | hex | { 6a90 6a19 6ad6 6a2c 6ad3 6a13 } | |
| $sequence_4 | hex | { 50 8b4204 ffd0 8b85e8efffff 6a00 8d8ddcefffff 51 } | |
| $sequence_5 | hex | { 894604 83c404 8bc6 e8???????? } | |
| $sequence_6 | hex | { 8b450c 3978fc 7e10 8b40f4 } | |
| $sequence_7 | hex | { 6adb 6a52 6af1 6a72 6a8a 6a3f } | |
| $sequence_8 | hex | { 6a17 6a31 6a1b 6a24 6a5a 6a3d } | |
| $sequence_9 | hex | { e8???????? 6a08 e8???????? 894604 83c404 } | |
| $sequence_10 | hex | { 52 e8???????? 8b4e04 8901 } | |
| $sequence_11 | hex | { 8b4e04 40 3b4104 72ec } | |
| $sequence_12 | hex | { 8b4e04 8901 8b4e04 33c0 83c404 } | |
| $sequence_13 | hex | { 50 e8???????? 88043e 46 83c404 3bf3 75ec } | |
| $sequence_14 | hex | { 668908 8d85c4efffff bf???????? 50 } | |
| $sequence_15 | hex | { c745fcffffffff 8935???????? 8b06 51 8bfc } | |
| $sequence_16 | hex | { e8???????? 83a6a0bf420000 59 83c604 81fe00020000 72dd b001 } | |
| $sequence_17 | hex | { 756e 85d2 756a 8b3d???????? 8db7ff1f0000 } | |
| $sequence_18 | hex | { 83c001 89442414 0f8429010000 55 } | |
| $sequence_19 | hex | { 8d442410 50 ffd3 8b450c 2dd0070000 } | |
| $sequence_20 | hex | { 894c243c 8d48fd 83e10f 8d7007 } | |
| $sequence_21 | hex | { c70021000000 e9???????? 894ddc c745e008344100 e9???????? c745e004344100 } | |
| $sequence_22 | hex | { 40 83f81d 7cf1 eb07 8b0cc5fc3c4100 } | |
| $sequence_23 | hex | { 6bf030 03348da0bf4200 837e18ff 740c 837e18fe 7406 } | |
| $sequence_24 | hex | { f2c3 f2e953070000 53 56 57 6a00 68a00f0000 } | |
| $sequence_25 | hex | { 8364240400 56 57 8b7c2418 57 } | |
| $sequence_26 | hex | { 8bfe e9???????? 33db 33c0 } | |
| $sequence_27 | hex | { 0f87ed010000 ff24855c664000 ff36 68???????? 6a00 } | |
| $sequence_28 | hex | { 56 e8???????? 85c0 0f8425ffffff 56 } | |
| $sequence_29 | hex | { 83e03f c1ff06 6bd830 8b04bda0bf4200 } |
Condition
7 of them and filesize < 843776In plain words (Heuristic)
- The file must be smaller than 843776 (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: 31200cc7-03b1-55f5-b69b-b9e36950bf28
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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