YARA · Malpedia signator rules
MALPEDIA_Win_Scarecrow_Auto
autogenerated rule brought to you by yara-signator
MalwareScarecrowMalpedia 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: Scarecrow.
It defines 10 patterns (0 text, 10 hex, 0 regex).
Summary generated from the rule's metadata and condition.
Rule source
win-scarecrow-auto.yarCreative Commons Attribution-ShareAlike 4.0
rule MALPEDIA_Win_Scarecrow_Auto : FILE
{
meta:
= "autogenerated rule brought to you by yara-signator"
= "Felix Bilstein - yara-signator at cocacoding dot com"
= "7fab5d70-082d-5157-9024-2dcf426a6b02"
= "2026-05-04"
= "2026-05-18"
= "https://malpedia.caad.fkie.fraunhofer.de/details/win.scarecrow"
= "https://github.com/malpedia/signator-rules//blob/c901f97b7df03e41917da74c2a84b04c227316c2/rules/win.scarecrow_auto.yar#L1-L131"
= "N/A"
= "118b6550fd678defbfd11297576eb5fee6908684c3ebc4ca9e3ce500d8361259"
= 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 = { f7fe 85d2 7521 b905000000 8b45f4 99 f7f9 }
$sequence_1 = { 889435d5f9ffff 46 83fe0c 72d3 8d85d5f9ffff 8985e0f6ffff c685f8faffff00 }
$sequence_2 = { c6458a37 c6458b0e c6458c69 c6458d01 c6458e28 8a854dffffff e8???????? }
$sequence_3 = { f7fb 8b45f0 c1e602 8975ec 85d2 743f }
$sequence_4 = { 40 74dd a1???????? 8b4df8 5f 893401 8bc6 }
$sequence_5 = { c6458f0d 89852cffffff c6459044 8a4585 e8???????? c645e800 c645e900 }
$sequence_6 = { f7fb 8d427f 99 f7fb 889435a5faffff 46 }
$sequence_7 = { c685c0fdffff25 c685c1fdffff7c c685c2fdffff25 c685c3fdffff36 c685c4fdffff25 c685c5fdffff25 }
$sequence_8 = { 83c8fe 40 7579 b905000000 0f1f440000 8b45f4 99 }
$sequence_9 = { 6685c0 75f5 2bce d1f9 51 8d45c9 8bca }
condition:
7 of them and filesize < 501760
}
Strings (10 patterns)
| Identifier | Type | Value | Modifiers |
|---|---|---|---|
| $sequence_0 | hex | { f7fe 85d2 7521 b905000000 8b45f4 99 f7f9 } | |
| $sequence_1 | hex | { 889435d5f9ffff 46 83fe0c 72d3 8d85d5f9ffff 8985e0f6ffff c685f8faffff00 } | |
| $sequence_2 | hex | { c6458a37 c6458b0e c6458c69 c6458d01 c6458e28 8a854dffffff e8???????? } | |
| $sequence_3 | hex | { f7fb 8b45f0 c1e602 8975ec 85d2 743f } | |
| $sequence_4 | hex | { 40 74dd a1???????? 8b4df8 5f 893401 8bc6 } | |
| $sequence_5 | hex | { c6458f0d 89852cffffff c6459044 8a4585 e8???????? c645e800 c645e900 } | |
| $sequence_6 | hex | { f7fb 8d427f 99 f7fb 889435a5faffff 46 } | |
| $sequence_7 | hex | { c685c0fdffff25 c685c1fdffff7c c685c2fdffff25 c685c3fdffff36 c685c4fdffff25 c685c5fdffff25 } | |
| $sequence_8 | hex | { 83c8fe 40 7579 b905000000 0f1f440000 8b45f4 99 } | |
| $sequence_9 | hex | { 6685c0 75f5 2bce d1f9 51 8d45c9 8bca } |
Condition
7 of them and filesize < 501760In plain words (Heuristic)
- The file must be smaller than 501760 (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: 7fab5d70-082d-5157-9024-2dcf426a6b02
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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