valleyrat_s2 | 137fc47b4ac196426432a498cb838f88b104b2bceb72cf1f38858d36f5453608

Analysis

max time kernel
149s
max time network
95s
platform
windows11-21h2_x64
resource
win11-20260130-en
resource tags

arch:x64arch:x86image:win11-20260130-enlocale:en-usos:windows11-21h2-x64systemwindows
submitted
01/04/2026, 04:26

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General

Target
137fc47b4ac196426432a498cb838f88b104b2bceb72cf1f38858d36f5453608.dll
Size 648KB
Sample260401-e2s9pagv5m
SHA256 137fc47b4ac196426432a498cb838f88b104b2bceb72cf1f38858d36f5453608
MD5 d9c809f370d39d464ac5e89cd0778756
SHA1 46b0055a919d20a91ee7a0c24741d0445e3b5ccc
SHA512 fa044e3751e81aab8967f87b01c3f4996d357116f54ee91d0a26422b4f1e38682471e020ff33a8ed22e4a8fad036f35bad0bc716f24258091c3c233100f5ff8a
SSDEEP 12288:fPEwSECyKJdPuHsRgs2bwp/oO8VtTtHGxUkvsjwVbaV5c7Q1ONtZ:fPEwSGidPuHsRgZQQO8DtGvsPV5c7DB
TLSH
T159E49D21B691C032D0AF1134A67ACBB75E7EB872577450CBF7A00A7D1E702E1AB3475A
MD5 SHA1 SHA512 SSDEEP TLSH

Score

10^/10

backdoor discovery valleyrat_s2

Malware Config

Extracted

Family

valleyrat_s2

Version

39.109.116.103:6666

Attributes

campaign_date
2026. 3.30

Signatures

Detects ValleyRAT payload 1 IoCs

resource	yara_rule
behavioral2/memory/3108-0-0x0000000002410000-0x000000000248A000-memory.dmp	family_valleyrat_stage_2_v2

ValleyRat
ValleyRat stage2 is a backdoor written in C++.
backdoor valleyrat_s2
Valleyrat_s2 family
valleyrat_s2

System Location Discovery: System Language Discovery 1 TTPs 1 IoCs

Attempt gather information about the system language of a victim in order to infer the geographical location of that host.

discovery

System Language Discovery

T1614.001

description	ioc	Process
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	rundll32.exe

Suspicious use of WriteProcessMemory 1 IoCs

description	pid	Process	procid_target
PID 2648 wrote to memory of 3108	2648	rundll32.exe	80

C:\Windows\system32\rundll32.exe
rundll32.exe C:\Users\Admin\AppData\Local\Temp\137fc47b4ac196426432a498cb838f88b104b2bceb72cf1f38858d36f5453608.dll,#1
1⤵
- Suspicious use of WriteProcessMemory
PID:2648
- C:\Windows\SysWOW64\rundll32.exe
  rundll32.exe C:\Users\Admin\AppData\Local\Temp\137fc47b4ac196426432a498cb838f88b104b2bceb72cf1f38858d36f5453608.dll,#1
  2⤵
  - System Location Discovery: System Language Discovery
  PID:3108

Network

MITRE ATT&CK Enterprise v16

Reconnaissance

Resource Development

Initial Access

Execution

Persistence

Privilege Escalation

Defense Evasion

Credential Access

Discovery

System Location Discovery

T1614

System Language Discovery

T1614.001

Lateral Movement

Collection

Command and Control

Exfiltration

Impact

Replay Monitor

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Downloads

memory/3108-0-0x0000000002410000-0x000000000248A000-memory.dmp

Download

memory/3108-4-0x0000000002030000-0x00000000022BB000-memory.dmp