YARA · Malpedia signator rules
MALPEDIA_Win_Flawedgrace_Auto
autogenerated rule brought to you by yara-signator
MalwareFlawedgraceMalpedia 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: Flawedgrace.
It defines 10 patterns (0 text, 10 hex, 0 regex).
Summary generated from the rule's metadata and condition.
Rule source
win-flawedgrace-auto.yarCreative Commons Attribution-ShareAlike 4.0
rule MALPEDIA_Win_Flawedgrace_Auto : FILE
{
meta:
= "autogenerated rule brought to you by yara-signator"
= "Felix Bilstein - yara-signator at cocacoding dot com"
= "6f950a4b-f50d-5bf4-9839-dd2d0367a532"
= "2026-05-04"
= "2026-05-18"
= "https://malpedia.caad.fkie.fraunhofer.de/details/win.flawedgrace"
= "https://github.com/malpedia/signator-rules//blob/c901f97b7df03e41917da74c2a84b04c227316c2/rules/win.flawedgrace_auto.yar#L1-L132"
= "N/A"
= "59a872e135f9eae0947671cfc9a77340e428a38ee452a5294702c6eab9545dee"
= 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 = { 83c414 8d4df8 e8???????? 8b4df8 3b4f24 7591 57 }
$sequence_1 = { c68503e4ffff00 c68504e4ffff19 c68505e4ffffa0 c68506e4ffff3e c68507e4ffffa0 c68508e4ffff66 c68509e4ffffa0 }
$sequence_2 = { 0fb6c0 85c0 741f 8b8de4c0ffff 8b5108 8995ccc0ffff 8b95e4c0ffff }
$sequence_3 = { c6853ec3ffff00 c6853fc3ffff00 c68540c3ffff10 c68541c3ffff00 c68542c3ffff00 c68543c3ffff00 c68544c3ffff00 }
$sequence_4 = { c685f9c9ffffe8 c685fac9ffffda c685fbc9ffff0a c685fcc9ffff00 c685fdc9ffff00 c685fec9ffff48 c685ffc9ffff83 }
$sequence_5 = { 0fb6c3 330c85e0934500 334f48 894de4 c1eb18 8b45ec c1e810 }
$sequence_6 = { c6857de1ffff00 c6857ee1ffff00 c6857fe1ffff00 c68580e1ffff00 c68581e1ffff00 c68582e1ffff00 c68583e1ffff00 }
$sequence_7 = { c68580e4ffff00 c68581e4ffff00 c68582e4ffff00 c68583e4ffff00 c68584e4ffff00 }
$sequence_8 = { 8b4e04 8b45e8 8d0441 eb06 8b4604 0345e8 8945d8 }
$sequence_9 = { 0fb6c0 330c85e0d74500 0fb6c2 330c85e0d34500 338f90000000 8b879c000000 33d9 }
condition:
7 of them and filesize < 966656
}
Strings (10 patterns)
| Identifier | Type | Value | Modifiers |
|---|---|---|---|
| $sequence_0 | hex | { 83c414 8d4df8 e8???????? 8b4df8 3b4f24 7591 57 } | |
| $sequence_1 | hex | { c68503e4ffff00 c68504e4ffff19 c68505e4ffffa0 c68506e4ffff3e c68507e4ffffa0 c68508e4ffff66 c68509e4ffffa0 } | |
| $sequence_2 | hex | { 0fb6c0 85c0 741f 8b8de4c0ffff 8b5108 8995ccc0ffff 8b95e4c0ffff } | |
| $sequence_3 | hex | { c6853ec3ffff00 c6853fc3ffff00 c68540c3ffff10 c68541c3ffff00 c68542c3ffff00 c68543c3ffff00 c68544c3ffff00 } | |
| $sequence_4 | hex | { c685f9c9ffffe8 c685fac9ffffda c685fbc9ffff0a c685fcc9ffff00 c685fdc9ffff00 c685fec9ffff48 c685ffc9ffff83 } | |
| $sequence_5 | hex | { 0fb6c3 330c85e0934500 334f48 894de4 c1eb18 8b45ec c1e810 } | |
| $sequence_6 | hex | { c6857de1ffff00 c6857ee1ffff00 c6857fe1ffff00 c68580e1ffff00 c68581e1ffff00 c68582e1ffff00 c68583e1ffff00 } | |
| $sequence_7 | hex | { c68580e4ffff00 c68581e4ffff00 c68582e4ffff00 c68583e4ffff00 c68584e4ffff00 } | |
| $sequence_8 | hex | { 8b4e04 8b45e8 8d0441 eb06 8b4604 0345e8 8945d8 } | |
| $sequence_9 | hex | { 0fb6c0 330c85e0d74500 0fb6c2 330c85e0d34500 338f90000000 8b879c000000 33d9 } |
Condition
7 of them and filesize < 966656In plain words (Heuristic)
- The file must be smaller than 966656 (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: 6f950a4b-f50d-5bf4-9839-dd2d0367a532
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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