YARA · Malpedia signator rules
MALPEDIA_Win_Webc2_Ausov_Auto
autogenerated rule brought to you by yara-signator
MalwareWebc2 AusovMalpedia 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: Webc2 Ausov.
It defines 10 patterns (0 text, 10 hex, 0 regex).
Summary generated from the rule's metadata and condition.
Rule source
win-webc2-ausov-auto.yarCreative Commons Attribution-ShareAlike 4.0
rule MALPEDIA_Win_Webc2_Ausov_Auto : FILE
{
meta:
= "autogenerated rule brought to you by yara-signator"
= "Felix Bilstein - yara-signator at cocacoding dot com"
= "9f7dcd3a-83e3-51b1-b972-c6423fd03466"
= "2026-05-04"
= "2026-05-18"
= "https://malpedia.caad.fkie.fraunhofer.de/details/win.webc2_ausov"
= "https://github.com/malpedia/signator-rules//blob/c901f97b7df03e41917da74c2a84b04c227316c2/rules/win.webc2_ausov_auto.yar#L1-L119"
= "N/A"
= "54e3ad7a65c1020ea5947e1b7fb8d16c99e374f254cf080dd27feb76035c9b99"
= 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 = { 83854cfaffff02 80bd46faffff00 75ae c78540faffff00000000 eb0b 1bc0 83d8ff }
$sequence_1 = { 0f8407000000 0f8501000000 f8 8b550c }
$sequence_2 = { b941000000 33c0 8dbda9faffff f3ab }
$sequence_3 = { 7546 80bd47faffff00 7431 8b8548faffff 8a4801 888d46faffff }
$sequence_4 = { 0355f4 0fbe4201 3345f4 8945fc 0f8407000000 }
$sequence_5 = { 6a00 8d85a8faffff 50 8d8dbcfcffff }
$sequence_6 = { 85c9 740d 85c0 7409 5f 5e }
$sequence_7 = { 6a00 68???????? 8d85f8fbffff 50 e8???????? 83c408 50 }
$sequence_8 = { 0f8501000000 f8 68???????? 8d8dfcfbffff 51 e8???????? 83c408 }
$sequence_9 = { ffd3 8bf0 85f6 0f8487000000 8b3d???????? }
condition:
7 of them and filesize < 40960
}
Strings (10 patterns)
| Identifier | Type | Value | Modifiers |
|---|---|---|---|
| $sequence_0 | hex | { 83854cfaffff02 80bd46faffff00 75ae c78540faffff00000000 eb0b 1bc0 83d8ff } | |
| $sequence_1 | hex | { 0f8407000000 0f8501000000 f8 8b550c } | |
| $sequence_2 | hex | { b941000000 33c0 8dbda9faffff f3ab } | |
| $sequence_3 | hex | { 7546 80bd47faffff00 7431 8b8548faffff 8a4801 888d46faffff } | |
| $sequence_4 | hex | { 0355f4 0fbe4201 3345f4 8945fc 0f8407000000 } | |
| $sequence_5 | hex | { 6a00 8d85a8faffff 50 8d8dbcfcffff } | |
| $sequence_6 | hex | { 85c9 740d 85c0 7409 5f 5e } | |
| $sequence_7 | hex | { 6a00 68???????? 8d85f8fbffff 50 e8???????? 83c408 50 } | |
| $sequence_8 | hex | { 0f8501000000 f8 68???????? 8d8dfcfbffff 51 e8???????? 83c408 } | |
| $sequence_9 | hex | { ffd3 8bf0 85f6 0f8487000000 8b3d???????? } |
Condition
7 of them and filesize < 40960In plain words (Heuristic)
- The file must be smaller than 40960 (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: 9f7dcd3a-83e3-51b1-b972-c6423fd03466
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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