YARA · Malpedia signator rules
MALPEDIA_Win_Fobber_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 / 75
What this rule detects
autogenerated rule brought to you by yara-signator
Associated malware family: Fobber.
It defines 16 patterns (0 text, 16 hex, 0 regex).
Summary generated from the rule's metadata and condition.
Rule source
win-fobber-auto.yarCreative Commons Attribution-ShareAlike 4.0
rule MALPEDIA_Win_Fobber_Auto : FILE
{
meta:
= "autogenerated rule brought to you by yara-signator"
= "Felix Bilstein - yara-signator at cocacoding dot com"
= "6b10b0b7-aac9-5b0d-999e-cef97191d4ff"
= "2026-05-04"
= "2026-05-18"
= "https://malpedia.caad.fkie.fraunhofer.de/details/win.fobber"
= "https://github.com/malpedia/signator-rules//blob/c901f97b7df03e41917da74c2a84b04c227316c2/rules/win.fobber_auto.yar#L1-L171"
= "N/A"
= "116b887c67ba2a8cdb51d9e66252babb8d46a5aed6610b6604df9d6e868cdbe7"
= 75
= 75
= "FILE"
= "1"
= "yara-signator v0.6.0"
= "callsandjumps;datarefs;binvalue"
= "20260422"
= "a182e35da64e6d71cb55f125c4d4225196523f14"
= "20260504"
= "CC BY-SA 4.0"
= "TLP:WHITE"
strings:
$sequence_0 = { 0fb066f5 75f6 66b80100 660fc146f9 }
$sequence_1 = { 740f 8d4d08 51 ff31 ffd0 }
$sequence_2 = { 89e5 ff750c 6800300000 ff7508 }
$sequence_3 = { 7607 49 01cf 01ce 41 }
$sequence_4 = { 8b750c 8b4d10 39f7 760e }
$sequence_5 = { ff7510 ff750c ff7508 e8???????? 85c0 7407 50 }
$sequence_6 = { 760e 8d0431 39f8 7607 49 }
$sequence_7 = { 31c9 f7d1 fc f2ae f7d1 49 89c8 }
$sequence_8 = { 05b05ec972 0100 0000 6a08 e8???????? 59 }
$sequence_9 = { 38d7 6a00 bc711fb37c 0474 04f0 }
$sequence_10 = { c072e458 c072c458 c072a458 c0728458 }
$sequence_11 = { 3bd6 7409 668b08 66890a 83c202 ff07 6a22 }
$sequence_12 = { 6802000080 ff15???????? 8d45f8 50 68???????? 6805000080 }
$sequence_13 = { ebd8 8bff 55 8bec 837d0800 56 8bf1 }
$sequence_14 = { 6300 0081efe2c5fe ff81c7c34c00 0081efc52500 0081efb55100 0081ef272400 }
$sequence_15 = { 81c6e9140000 81eefa360000 81eef8e4ffff 81c6507c0000 81eeb77a0000 81ee0b690000 81c6cf450000 }
condition:
7 of them and filesize < 188416
}
Strings (16 patterns)
| Identifier | Type | Value | Modifiers |
|---|---|---|---|
| $sequence_0 | hex | { 0fb066f5 75f6 66b80100 660fc146f9 } | |
| $sequence_1 | hex | { 740f 8d4d08 51 ff31 ffd0 } | |
| $sequence_2 | hex | { 89e5 ff750c 6800300000 ff7508 } | |
| $sequence_3 | hex | { 7607 49 01cf 01ce 41 } | |
| $sequence_4 | hex | { 8b750c 8b4d10 39f7 760e } | |
| $sequence_5 | hex | { ff7510 ff750c ff7508 e8???????? 85c0 7407 50 } | |
| $sequence_6 | hex | { 760e 8d0431 39f8 7607 49 } | |
| $sequence_7 | hex | { 31c9 f7d1 fc f2ae f7d1 49 89c8 } | |
| $sequence_8 | hex | { 05b05ec972 0100 0000 6a08 e8???????? 59 } | |
| $sequence_9 | hex | { 38d7 6a00 bc711fb37c 0474 04f0 } | |
| $sequence_10 | hex | { c072e458 c072c458 c072a458 c0728458 } | |
| $sequence_11 | hex | { 3bd6 7409 668b08 66890a 83c202 ff07 6a22 } | |
| $sequence_12 | hex | { 6802000080 ff15???????? 8d45f8 50 68???????? 6805000080 } | |
| $sequence_13 | hex | { ebd8 8bff 55 8bec 837d0800 56 8bf1 } | |
| $sequence_14 | hex | { 6300 0081efe2c5fe ff81c7c34c00 0081efc52500 0081efb55100 0081ef272400 } | |
| $sequence_15 | hex | { 81c6e9140000 81eefa360000 81eef8e4ffff 81c6507c0000 81eeb77a0000 81ee0b690000 81c6cf450000 } |
Condition
7 of them and filesize < 188416In plain words (Heuristic)
- The file must be smaller than 188416 (a cheap guard that skips large files).
- At least 7 patterns in the rule must match.
Test this rule in your browser
Drop a file to scan it with this rule using YARA-X compiled to WebAssembly. Nothing is uploaded.
Drop a file here or click to chooseScanned locally with YARA-X. Files up to 200 MB.
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: 6b10b0b7-aac9-5b0d-999e-cef97191d4ff
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
Related rules
- MalwareMalpedia signator rules· Felix Bilstein - yara-signator at cocacoding dot com· 2026-05-04
- MalwareMalpedia signator rules· Felix Bilstein - yara-signator at cocacoding dot com· 2026-05-04
- MalwareMalpedia signator rules· Felix Bilstein - yara-signator at cocacoding dot com· 2026-05-04
- MalwareMalpedia signator rules· Felix Bilstein - yara-signator at cocacoding dot com· 2026-05-04
- MalwareMalpedia signator rules· Felix Bilstein - yara-signator at cocacoding dot com· 2026-05-04
- MalwareMalpedia signator rules· Felix Bilstein - yara-signator at cocacoding dot com· 2026-05-04
- MalwareMalpedia signator rules· Felix Bilstein - yara-signator at cocacoding dot com· 2026-05-04
- MalwareMalpedia signator rules· Felix Bilstein - yara-signator at cocacoding dot com· 2026-05-04