YARA · Malpedia signator rules
MALPEDIA_Win_Grabbot_Auto
autogenerated rule brought to you by yara-signator
MalwareGrabbotMalpedia 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: Grabbot.
It defines 16 patterns (0 text, 16 hex, 0 regex).
Summary generated from the rule's metadata and condition.
Rule source
win-grabbot-auto.yarCreative Commons Attribution-ShareAlike 4.0
rule MALPEDIA_Win_Grabbot_Auto : FILE
{
meta:
= "autogenerated rule brought to you by yara-signator"
= "Felix Bilstein - yara-signator at cocacoding dot com"
= "80bedd71-05e5-5d45-bc8d-074a3e4f2c9d"
= "2026-05-04"
= "2026-05-18"
= "https://malpedia.caad.fkie.fraunhofer.de/details/win.grabbot"
= "https://github.com/malpedia/signator-rules//blob/c901f97b7df03e41917da74c2a84b04c227316c2/rules/win.grabbot_auto.yar#L1-L162"
= "N/A"
= "35e407c1959bada62cd493118ce1f0a617fd8c20cd3b6e1a49dd990333d5e682"
= 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 = { 770b 83f841 7206 83c020 0fb7c0 }
$sequence_1 = { 0fb702 83f85a 770b 83f841 }
$sequence_2 = { 770d 83f841 7208 83c020 }
$sequence_3 = { 50 e8???????? ffe0 c3 686541fba7 e8???????? }
$sequence_4 = { 55 8bec 83ec08 b84d5a0000 56 57 }
$sequence_5 = { 8b463c 03c6 813850450000 7523 0fb75004 }
$sequence_6 = { 7407 58 034508 ab ebe3 }
$sequence_7 = { 663bca 0f850c010000 8b8890000000 85c9 }
$sequence_8 = { 56 ffd0 33c9 66894c37fe }
$sequence_9 = { 8b0d???????? 894808 8b0d???????? 89480c e9???????? }
$sequence_10 = { 7428 8b0d???????? 8908 8b0d???????? 894804 8b0d???????? }
$sequence_11 = { 89480c e9???????? 33c0 e9???????? }
$sequence_12 = { ff15???????? 50 ff15???????? a3???????? 85c0 7505 83c8ff }
$sequence_13 = { 33f6 ff15???????? 85c0 741b 8d440002 50 e8???????? }
$sequence_14 = { 6840420f00 6a00 ff15???????? a3???????? }
$sequence_15 = { 0f9fc3 e8???????? 83c414 5e }
condition:
7 of them and filesize < 1335296
}
Strings (16 patterns)
| Identifier | Type | Value | Modifiers |
|---|---|---|---|
| $sequence_0 | hex | { 770b 83f841 7206 83c020 0fb7c0 } | |
| $sequence_1 | hex | { 0fb702 83f85a 770b 83f841 } | |
| $sequence_2 | hex | { 770d 83f841 7208 83c020 } | |
| $sequence_3 | hex | { 50 e8???????? ffe0 c3 686541fba7 e8???????? } | |
| $sequence_4 | hex | { 55 8bec 83ec08 b84d5a0000 56 57 } | |
| $sequence_5 | hex | { 8b463c 03c6 813850450000 7523 0fb75004 } | |
| $sequence_6 | hex | { 7407 58 034508 ab ebe3 } | |
| $sequence_7 | hex | { 663bca 0f850c010000 8b8890000000 85c9 } | |
| $sequence_8 | hex | { 56 ffd0 33c9 66894c37fe } | |
| $sequence_9 | hex | { 8b0d???????? 894808 8b0d???????? 89480c e9???????? } | |
| $sequence_10 | hex | { 7428 8b0d???????? 8908 8b0d???????? 894804 8b0d???????? } | |
| $sequence_11 | hex | { 89480c e9???????? 33c0 e9???????? } | |
| $sequence_12 | hex | { ff15???????? 50 ff15???????? a3???????? 85c0 7505 83c8ff } | |
| $sequence_13 | hex | { 33f6 ff15???????? 85c0 741b 8d440002 50 e8???????? } | |
| $sequence_14 | hex | { 6840420f00 6a00 ff15???????? a3???????? } | |
| $sequence_15 | hex | { 0f9fc3 e8???????? 83c414 5e } |
Condition
7 of them and filesize < 1335296In plain words (Heuristic)
- The file must be smaller than 1335296 (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: 80bedd71-05e5-5d45-bc8d-074a3e4f2c9d
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