YARA · Malpedia signator rules
MALPEDIA_Win_Lambload_Auto
autogenerated rule brought to you by yara-signator
MalwareLambloadMalpedia 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: Lambload.
It defines 10 patterns (0 text, 10 hex, 0 regex).
Summary generated from the rule's metadata and condition.
Rule source
win-lambload-auto.yarCreative Commons Attribution-ShareAlike 4.0
rule MALPEDIA_Win_Lambload_Auto : FILE
{
meta:
= "autogenerated rule brought to you by yara-signator"
= "Felix Bilstein - yara-signator at cocacoding dot com"
= "acd95014-1417-5951-843e-5a95eac49cfe"
= "2026-05-04"
= "2026-05-18"
= "https://malpedia.caad.fkie.fraunhofer.de/details/win.lambload"
= "https://github.com/malpedia/signator-rules//blob/c901f97b7df03e41917da74c2a84b04c227316c2/rules/win.lambload_auto.yar#L1-L122"
= "N/A"
= "4d00ae1d97989bbf86335c6c50c4111923a994361de68d8062d31965cd339c87"
= 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 = { 03f7 8d4601 50 ff75f4 }
$sequence_1 = { e8???????? 83c40c 85c0 7511 ffb5ecf5ffff e8???????? 59 }
$sequence_2 = { 72d0 7705 3b550c 76c9 8b450c }
$sequence_3 = { c604063d 59 8945f4 8bf7 75e6 }
$sequence_4 = { 8bf8 8bf1 a5 53 66a5 e8???????? 85c0 }
$sequence_5 = { c785f8ebffff10000000 8d8d34ecffff 8b51cc 8b31 8bc2 }
$sequence_6 = { c1e006 03048d00490710 eb02 8bc2 f6402480 7418 e8???????? }
$sequence_7 = { 8945fc 8d4601 50 ff75f4 }
$sequence_8 = { 0f859b010000 8b3d???????? 8d85e8fbffff 50 8d85ecfbffff 50 56 }
$sequence_9 = { bf???????? 8b6c242c 8d45ff 83f81d 0f87ba030000 33c9 8a88287e0310 }
condition:
7 of them and filesize < 1039360
}
Strings (10 patterns)
| Identifier | Type | Value | Modifiers |
|---|---|---|---|
| $sequence_0 | hex | { 03f7 8d4601 50 ff75f4 } | |
| $sequence_1 | hex | { e8???????? 83c40c 85c0 7511 ffb5ecf5ffff e8???????? 59 } | |
| $sequence_2 | hex | { 72d0 7705 3b550c 76c9 8b450c } | |
| $sequence_3 | hex | { c604063d 59 8945f4 8bf7 75e6 } | |
| $sequence_4 | hex | { 8bf8 8bf1 a5 53 66a5 e8???????? 85c0 } | |
| $sequence_5 | hex | { c785f8ebffff10000000 8d8d34ecffff 8b51cc 8b31 8bc2 } | |
| $sequence_6 | hex | { c1e006 03048d00490710 eb02 8bc2 f6402480 7418 e8???????? } | |
| $sequence_7 | hex | { 8945fc 8d4601 50 ff75f4 } | |
| $sequence_8 | hex | { 0f859b010000 8b3d???????? 8d85e8fbffff 50 8d85ecfbffff 50 56 } | |
| $sequence_9 | hex | { bf???????? 8b6c242c 8d45ff 83f81d 0f87ba030000 33c9 8a88287e0310 } |
Condition
7 of them and filesize < 1039360In plain words (Heuristic)
- The file must be smaller than 1039360 (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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Drop a file here or click to chooseScanned locally with YARA-X. Files up to 200 MB.
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: acd95014-1417-5951-843e-5a95eac49cfe
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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