YARA · SEKOIA.IO Community
SEKOIA_Crime_Sload_Vbs_Downloader_Strings_1
Detects an sLoad downloader based on strings
- Author
- Sekoia.io
- Date
- 2022-08-02
- Modified
- 2024-12-19
- Score / Quality
- 75 / 80
What this rule detects
Detects an sLoad downloader based on strings
Associated malware family: Vbsdownloader.
It defines 3 patterns (1 text, 2 hex, 0 regex).
Summary generated from the rule's metadata and condition.
Rule source
crime-sload-vbs-downloader-strings-1.yarDetection Rule License 1.1
rule SEKOIA_Crime_Sload_Vbs_Downloader_Strings_1 : FILE
{
meta:
= "Detects an sLoad downloader based on strings"
= "Sekoia.io"
= "77ff0d21-9249-43b2-9a6d-87988a2dec3b"
= "2022-08-02"
= "2024-12-19"
= "https://github.com/SEKOIA-IO/Community"
= "https://github.com/SEKOIA-IO/Community/blob/a438a5901a211c2abdf75da9c93921ef187473d1/yara_rules/crime_sload_vbs_downloader_strings_1.yar#L1-L17"
= "https://github.com/SEKOIA-IO/Community/blob/a438a5901a211c2abdf75da9c93921ef187473d1/LICENSE.md"
= "06e4fcb6c48078c6c44d779820fc901b0f335b9495097ed28206826a959d0712"
= 75
= 80
= "FILE"
= "1.0"
= "TLP:CLEAR"
strings:
$ = "On Error Resume Next"
$ = {0A [4] 3D 41 72 72 61 79}
$ = { 2E 50 61 74 74 65 72 6E 20 3D 20 22 28 [4-10] 7C [4-10] 7C [4-10] 7C [4-10] 7C [4-10] 7C [4-10] 7C [4-10] 7C }
condition:
all of them and filesize < 20KB
}
Strings (3 patterns)
| Identifier | Type | Value | Modifiers |
|---|---|---|---|
| $ | text | "On Error Resume Next" | |
| $ | hex | {0A [4] 3D 41 72 72 61 79} | |
| $ | hex | { 2E 50 61 74 74 65 72 6E 20 3D 20 22 28 [4-10] 7C [4-10] 7C [4-10] 7C [4-10] 7C [4-10] 7C [4-10] 7C [4-10] 7C } |
Condition
all of them and filesize < 20KBIn plain words (Heuristic)
- The file must be smaller than 20KB (a cheap guard that skips large files).
- All patterns in the rule 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.
References
Licence & attribution
Author: Sekoia.io
Source repository: SEKOIA.IO Community @ a438a5901a
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: 77ff0d21-9249-43b2-9a6d-87988a2dec3b
Metadata
| version | 1.0 |
|---|---|
| classification | TLP:CLEAR |
Tags:FILE
Related rules
- APT / threat actorSEKOIA.IO Community· Sekoia.io· 2023-01-25
- APT / threat actorSEKOIA.IO Community· Sekoia.io· 2023-01-24
- MalwareditekSHen detection· ditekShen· 2020-11-06
- MalwareSEKOIA.IO Community· Sekoia.io· 2024-07-16
- MalwareSEKOIA.IO Community· Sekoia.io· 2024-08-23
- MalwareSEKOIA.IO Community· Sekoia.io· 2024-04-22
- MalwareSEKOIA.IO Community· Sekoia.io· 2024-07-23
- MalwareSEKOIA.IO Community· Sekoia.io· 2024-10-20