YARA · Malpedia signator rules
MALPEDIA_Win_Maskgramstealer_Auto
autogenerated rule brought to you by yara-signator
MalwareMaskgramstealerMalpedia 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: Maskgramstealer.
It defines 10 patterns (0 text, 10 hex, 0 regex).
Summary generated from the rule's metadata and condition.
Rule source
win-maskgramstealer-auto.yarCreative Commons Attribution-ShareAlike 4.0
rule MALPEDIA_Win_Maskgramstealer_Auto : FILE
{
meta:
= "autogenerated rule brought to you by yara-signator"
= "Felix Bilstein - yara-signator at cocacoding dot com"
= "4ee1204a-c4f7-5140-8868-3ec21d80ad68"
= "2026-05-04"
= "2026-05-18"
= "https://malpedia.caad.fkie.fraunhofer.de/details/win.maskgramstealer"
= "https://github.com/malpedia/signator-rules//blob/c901f97b7df03e41917da74c2a84b04c227316c2/rules/win.maskgramstealer_auto.yar#L1-L113"
= "N/A"
= "aaf8addcd84a5405900df60d1e4cadcf3baed2d226e1d47976eaeb2f5bfc316c"
= 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 = { 48ffc2 807c11ff00 75f3 c3 }
$sequence_1 = { 4c39c0 7412 448a0c02 4584c9 7409 44880c01 48ffc0 }
$sequence_2 = { c3 31c0 448a0402 4584c0 }
$sequence_3 = { 7503 48ffc2 4c89d1 e8???????? 4c89d1 e8???????? }
$sequence_4 = { 48833d????????00 0f95c2 4885c0 0f95c0 }
$sequence_5 = { e9???????? 4881c428060000 5b 5e 5f }
$sequence_6 = { 8a02 3c5c 7404 3c2f 7503 }
$sequence_7 = { 488b0d???????? 488b1d???????? ffd3 488b0d???????? ffd3 }
$sequence_8 = { 8b8c24b0060000 488d942480000000 e8???????? 83bc24b006000000 }
$sequence_9 = { 498d1400 8a02 3c5c 7404 3c2f }
condition:
7 of them and filesize < 353280
}
Strings (10 patterns)
| Identifier | Type | Value | Modifiers |
|---|---|---|---|
| $sequence_0 | hex | { 48ffc2 807c11ff00 75f3 c3 } | |
| $sequence_1 | hex | { 4c39c0 7412 448a0c02 4584c9 7409 44880c01 48ffc0 } | |
| $sequence_2 | hex | { c3 31c0 448a0402 4584c0 } | |
| $sequence_3 | hex | { 7503 48ffc2 4c89d1 e8???????? 4c89d1 e8???????? } | |
| $sequence_4 | hex | { 48833d????????00 0f95c2 4885c0 0f95c0 } | |
| $sequence_5 | hex | { e9???????? 4881c428060000 5b 5e 5f } | |
| $sequence_6 | hex | { 8a02 3c5c 7404 3c2f 7503 } | |
| $sequence_7 | hex | { 488b0d???????? 488b1d???????? ffd3 488b0d???????? ffd3 } | |
| $sequence_8 | hex | { 8b8c24b0060000 488d942480000000 e8???????? 83bc24b006000000 } | |
| $sequence_9 | hex | { 498d1400 8a02 3c5c 7404 3c2f } |
Condition
7 of them and filesize < 353280In plain words (Heuristic)
- The file must be smaller than 353280 (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: 4ee1204a-c4f7-5140-8868-3ec21d80ad68
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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