YARA · Embee Research
EMBEERESEARCH_Win_Lumma_Update_Simple_Strings_Sep_2023
- Author
- Matthew @ Embee_Research
- Date
- 2023-09-13
- Modified
- 2023-09-21
- Score / Quality
- 75 / 75
What this rule detects
Associated malware family: Lumma.
Targets: Windows PE.
It defines 4 patterns (4 text, 0 hex, 0 regex).
Summary generated from the rule's metadata and condition.
Rule source
win-lumma-update-simple-strings-sep-2023.yarDetection Rule License 1.1
rule EMBEERESEARCH_Win_Lumma_Update_Simple_Strings_Sep_2023 : FILE
{
meta:
= ""
= "Matthew @ Embee_Research"
= "90209fc6-fd50-5b55-a400-112b2f207885"
= "2023-09-13"
= "2023-09-21"
= "https://github.com/embee-research/Yara-detection-rules/"
= "https://github.com/embee-research/Yara-detection-rules//blob/ac56d6f6fd2a30c8cb6e5c0455d6519210a8b0f4/Rules/win_lumma_updated_sep_2023.yar#L1-L25"
= "N/A"
= "898a2bdbbb33ccd63b038c67d217554a668a52e9642874bd0f57e08153e6e5be"
= "61571057a5a9c114b6ed5b94b922f2b389406a05e705b3e9e6ddbee221f74c92"
= 75
= 75
= "FILE"
strings:
$s1 = "Do you want to run a malware ?" wide
$s2 = "c2sock" wide
$s3 = "TeslaBrowser/5" wide
$s4 = "Crypt build to disable this message" wide
condition:
uint16( 0 ) == 0x5a4d and filesize < 5000KB and ( all of ( $s* ) )
}
Strings (4 patterns)
| Identifier | Type | Value | Modifiers |
|---|---|---|---|
| $s1 | text | "Do you want to run a malware ?" | wide |
| $s2 | text | "c2sock" | wide |
| $s3 | text | "TeslaBrowser/5" | wide |
| $s4 | text | "Crypt build to disable this message" | wide |
Condition
uint16( 0 ) == 0x5a4d and filesize < 5000KB and ( all of ( $s* ) )In plain words (Heuristic)
- The file must start with “MZ” — a Windows executable (PE).
- The file must be smaller than 5000KB (a cheap guard that skips large files).
- All patterns in ( $s* ) must match.
Test this rule in your browser
Drop a file to scan it with this rule using YARA-X compiled to WebAssembly. Nothing is uploaded.
Drop a file here or click to chooseScanned locally with YARA-X. Files up to 200 MB.
Sample hashes
Hashes of samples the author lists in the rule's meta (look them up in your threat-intelligence platform).
- 898a2bdbbb33ccd63b038c67d217554a668a52e9642874bd0f57e08153e6e5be
Licence & attribution
Author: Matthew @ Embee_Research
Source repository: Embee Research @ ac56d6f6fd
Licence: Detection Rule License 1.1 (repository licence)
Mirrored via YARA Forge 20260927, which prefixes rule names with the source and adds normalised meta fields.
Rule id: 90209fc6-fd50-5b55-a400-112b2f207885
Tags:FILE
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