YARA · Volexity threat-intel
VOLEXITY_Malware_Win_Backwash_Cpp
CPP loader for the Backwash malware.
- Author
- threatintel@volexity.com
- Date
- 2021-11-17
- Modified
- 2023-11-13
- Score / Quality
- 75 / 80
What this rule detects
CPP loader for the Backwash malware.
It defines 3 patterns (3 text, 0 hex, 0 regex).
Summary generated from the rule's metadata and condition.
Rule source
rule VOLEXITY_Malware_Win_Backwash_Cpp : WHEELEDASH FILE MEMORY
{
meta:
= "CPP loader for the Backwash malware."
= "threatintel@volexity.com"
= "8a1c4ff1-1827-5e6f-b838-664d8c3be840"
= "2021-11-17"
= "2023-11-13"
= "https://github.com/volexity/threat-intel"
= "https://github.com/volexity/threat-intel/blob/3a9d0b52459877ee866a9a0ba06e60059b778c77/2021/2021-12-06 - XEGroup/indicators/yara.yar#L3-L26"
= "https://github.com/volexity/threat-intel/blob/3a9d0b52459877ee866a9a0ba06e60059b778c77/LICENSE.txt"
= "0cf93de64aa4dba6cec99aa5989fc9c5049bc46ca5f3cb327b49d62f3646a852"
= "c8ed2d3103aa85363acd7f5573aeb936a5ab5a3bacbcf1f04e6b298299f24dae"
= 75
= 80
= "WHEELEDASH, FILE, MEMORY"
= "win"
= "all"
= "file,memory"
= "critical"
= "See license at https://github.com/volexity/threat-intel/blob/main/LICENSE.txt"
= 6147
= 2
strings:
$s1 = "cor1dbg.dll" wide
$s2 = "XEReverseShell.exe" wide
$s3 = "XOJUMAN=" wide
condition:
2 of them
}
Strings (3 patterns)
| Identifier | Type | Value | Modifiers |
|---|---|---|---|
| $s1 | text | "cor1dbg.dll" | wide |
| $s2 | text | "XEReverseShell.exe" | wide |
| $s3 | text | "XOJUMAN=" | wide |
Condition
2 of themIn plain words (Heuristic)
- At least 2 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.
References
Sample hashes
Hashes of samples the author lists in the rule's meta (look them up in your threat-intelligence platform).
- 0cf93de64aa4dba6cec99aa5989fc9c5049bc46ca5f3cb327b49d62f3646a852
Licence & attribution
Author: threatintel@volexity.com
Source repository: Volexity threat-intel @ 3a9d0b5245
Licence: BSD 2-Clause License (stated in the rule's own meta)
“See license at https://github.com/volexity/threat-intel/blob/main/LICENSE.txt”
Copyright notice: Copyright 2022 by Volexity, Inc.
Mirrored via YARA Forge 20260927, which prefixes rule names with the source and adds normalised meta fields.
Rule id: 8a1c4ff1-1827-5e6f-b838-664d8c3be840
Metadata
| os | win |
|---|---|
| os_arch | all |
| scan_context | file,memory |
| severity | critical |
| rule_id | 6147 |
| version | 2 |
Tags:WHEELEDASHFILEMEMORY
Related rules
- MalwareVolexity threat-intel· threatintel@volexity.com· 2021-11-17
- MalwareVolexity threat-intel· threatintel@volexity.com· 2021-11-17
- MalwareVolexity threat-intel· threatintel@volexity.com· 2021-11-17
- MalwareVolexity threat-intel· threatintel@volexity.com· 2020-09-04
- MalwareVolexity threat-intel· threatintel@volexity.com· 2021-05-25
- MalwareVolexity threat-intel· threatintel@volexity.com· 2024-02-22
- MalwareVolexity threat-intel· threatintel@volexity.com· 2024-03-28
- MalwareVolexity threat-intel· threatintel@volexity.com· 2022-04-07