YARA · Malpedia signator rules
MALPEDIA_Win_Grimagent_Auto
autogenerated rule brought to you by yara-signator
MalwareGrimagentMalpedia 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: Grimagent.
It defines 10 patterns (0 text, 10 hex, 0 regex).
Summary generated from the rule's metadata and condition.
Rule source
win-grimagent-auto.yarCreative Commons Attribution-ShareAlike 4.0
rule MALPEDIA_Win_Grimagent_Auto : FILE
{
meta:
= "autogenerated rule brought to you by yara-signator"
= "Felix Bilstein - yara-signator at cocacoding dot com"
= "697bb7ee-5f1d-5c1d-b5be-547405716929"
= "2026-05-04"
= "2026-05-18"
= "https://malpedia.caad.fkie.fraunhofer.de/details/win.grimagent"
= "https://github.com/malpedia/signator-rules//blob/c901f97b7df03e41917da74c2a84b04c227316c2/rules/win.grimagent_auto.yar#L1-L122"
= "N/A"
= "1c49744aa5f2c8c4924d5673b41e4aa8c2fbeeea1a58b2719f97b1f003420f8f"
= 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 = { 83c001 8945f8 8b4d0c 51 e8???????? }
$sequence_1 = { 894d0c ebd0 8b5508 0fb602 8b4d0c }
$sequence_2 = { 83c101 894d0c ebd0 8b5508 0fb602 }
$sequence_3 = { 750e c745e801000000 b801000000 eb1a 8b4df0 }
$sequence_4 = { 8b4dfc 51 e8???????? 85c0 7434 8d95d0feffff 52 }
$sequence_5 = { 3bc2 7514 8b45ec 83c002 8945ec 8b4dfc 83c102 }
$sequence_6 = { ebbe 8b550c 8955fc 8b450c 50 }
$sequence_7 = { 7426 8b5508 0fbe02 8b4d0c 0fbe11 3bc2 }
$sequence_8 = { 83c101 894d0c ebd0 8b5508 0fb602 8b4d0c 0fb611 }
$sequence_9 = { 8bec 8b4508 0fbe08 85c9 7426 8b5508 }
condition:
7 of them and filesize < 582656
}
Strings (10 patterns)
| Identifier | Type | Value | Modifiers |
|---|---|---|---|
| $sequence_0 | hex | { 83c001 8945f8 8b4d0c 51 e8???????? } | |
| $sequence_1 | hex | { 894d0c ebd0 8b5508 0fb602 8b4d0c } | |
| $sequence_2 | hex | { 83c101 894d0c ebd0 8b5508 0fb602 } | |
| $sequence_3 | hex | { 750e c745e801000000 b801000000 eb1a 8b4df0 } | |
| $sequence_4 | hex | { 8b4dfc 51 e8???????? 85c0 7434 8d95d0feffff 52 } | |
| $sequence_5 | hex | { 3bc2 7514 8b45ec 83c002 8945ec 8b4dfc 83c102 } | |
| $sequence_6 | hex | { ebbe 8b550c 8955fc 8b450c 50 } | |
| $sequence_7 | hex | { 7426 8b5508 0fbe02 8b4d0c 0fbe11 3bc2 } | |
| $sequence_8 | hex | { 83c101 894d0c ebd0 8b5508 0fb602 8b4d0c 0fb611 } | |
| $sequence_9 | hex | { 8bec 8b4508 0fbe08 85c9 7426 8b5508 } |
Condition
7 of them and filesize < 582656In plain words (Heuristic)
- The file must be smaller than 582656 (a cheap guard that skips large files).
- At least 7 patterns in the rule must match.
Test this rule in your browser
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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: 697bb7ee-5f1d-5c1d-b5be-547405716929
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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