valleyrat_s2 | 233086e7d57e16523ac3463df306cfc497a9ba3c3e8268f62c8625ef56b2380e

Analysis

max time kernel
148s
max time network
143s
platform
windows11-ltsc_2024_x64
resource
win11ltsc2024-20260617-en
resource tags

arch:x64arch:x86image:win11ltsc2024-20260617-enlocale:en-usos:windows11-ltsc_2024-x64systemwindows
submitted
19/06/2026, 12:16

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General

Target
Tax-Number919863.exe
Size 24KB
Sample260619-pfty7sg19v
SHA256 233086e7d57e16523ac3463df306cfc497a9ba3c3e8268f62c8625ef56b2380e
MD5 3c305f878c678e9017e3e53fb6020283
SHA1 b8f157d19017065ccad21e5ceae21184d0fc3e5d
SHA512 7783d325bf738dbbc2a35545e2aa31d672dbab7e255720d83a9da66ce885eb0a60853211e95748f8bd3bcd3c470f2a9e8d10bb767b02f8a14511cec6e748e7ec
SSDEEP 384:8qRg0yFtNq5Awt9F7heZBLy8RbmL4nNyGu0:eFnq5xtgBL5AL10
TLSH
T1B8B27C67CE500CCBFE1A8AB0A0E59227FC32B6999ED1D3C35378C1550F513817A9A2E9
MD5 SHA1 SHA512 SSDEEP TLSH

Score

10^/10

backdoor valleyrat_s2 persistence

Malware Config

Extracted

Family

valleyrat_s2

Version

yk.ggdy.com:8003
yk.ggdy.com:80

Attributes

campaign_date
2023. 6.30

Signatures

Family: ValleyRat
ValleyRat stage2 is a backdoor written in C++.
backdoor valleyrat_s2

Drops file in Drivers directory 3 IoCs

description	ioc	Process
File created	C:\Windows\System32\drivers\pcdhost.sys	Tax-Number919863.exe
File opened for modification	C:\Windows\System32\drivers\pcdhost.sys	Tax-Number919863.exe
File opened for modification	C:\Windows\System32\drivers\pcdhost.sys	Tax-Number919863.exe

Adds Run key to start application 2 TTPs 1 IoCs

persistence

Registry Run Keys / Startup Folder

T1547.001

Modify Registry

T1112

description	ioc	Process
Set value (str)	\REGISTRY\MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Run\USB3YTHS = "cmd /c start \"\" /D \"C:\\ProgramData\\USB3YTHS\" Tax-Number919863.exe"	Tax-Number919863.exe

Suspicious use of SetThreadContext 4 IoCs

description	pid	Process	procid_target
PID 2204 set thread context of 1620	2204	Tax-Number919863.exe	91
PID 2204 set thread context of 4776	2204	Tax-Number919863.exe	96
PID 1464 set thread context of 2744	1464	Tax-Number919863.exe	97
PID 1464 set thread context of 1516	1464	Tax-Number919863.exe	98

Executes dropped EXE 2 IoCs

pid	Process
1472	pcdhost.sys
1464	Tax-Number919863.exe

Loads dropped DLL 1 IoCs

pid	Process
1464	Tax-Number919863.exe

Enumerates physical storage devices 1 TTPs
Attempts to interact with connected storage/optical drive(s).

System Information Discovery
T1082

Suspicious behavior: LoadsDriver 4 IoCs

pid	Process
824	Process not Found
824	Process not Found
824	Process not Found
824	Process not Found

Suspicious use of WriteProcessMemory 29 IoCs

description	pid	Process	procid_target
PID 2204 wrote to memory of 1620	2204	Tax-Number919863.exe	91
PID 2204 wrote to memory of 1620	2204	Tax-Number919863.exe	91
PID 2204 wrote to memory of 1620	2204	Tax-Number919863.exe	91
PID 2204 wrote to memory of 1620	2204	Tax-Number919863.exe	91
PID 2204 wrote to memory of 1620	2204	Tax-Number919863.exe	91
PID 2204 wrote to memory of 1620	2204	Tax-Number919863.exe	91
PID 2204 wrote to memory of 1620	2204	Tax-Number919863.exe	91
PID 4804 wrote to memory of 1464	4804	cmd.exe	94
PID 2204 wrote to memory of 4776	2204	Tax-Number919863.exe	96
PID 2204 wrote to memory of 4776	2204	Tax-Number919863.exe	96
PID 2204 wrote to memory of 4776	2204	Tax-Number919863.exe	96
PID 2204 wrote to memory of 4776	2204	Tax-Number919863.exe	96
PID 2204 wrote to memory of 4776	2204	Tax-Number919863.exe	96
PID 2204 wrote to memory of 4776	2204	Tax-Number919863.exe	96
PID 2204 wrote to memory of 4776	2204	Tax-Number919863.exe	96
PID 1464 wrote to memory of 2744	1464	Tax-Number919863.exe	97
PID 1464 wrote to memory of 2744	1464	Tax-Number919863.exe	97
PID 1464 wrote to memory of 2744	1464	Tax-Number919863.exe	97
PID 1464 wrote to memory of 2744	1464	Tax-Number919863.exe	97
PID 1464 wrote to memory of 2744	1464	Tax-Number919863.exe	97
PID 1464 wrote to memory of 2744	1464	Tax-Number919863.exe	97
PID 1464 wrote to memory of 2744	1464	Tax-Number919863.exe	97
PID 1464 wrote to memory of 1516	1464	Tax-Number919863.exe	98
PID 1464 wrote to memory of 1516	1464	Tax-Number919863.exe	98
PID 1464 wrote to memory of 1516	1464	Tax-Number919863.exe	98
PID 1464 wrote to memory of 1516	1464	Tax-Number919863.exe	98
PID 1464 wrote to memory of 1516	1464	Tax-Number919863.exe	98
PID 1464 wrote to memory of 1516	1464	Tax-Number919863.exe	98
PID 1464 wrote to memory of 1516	1464	Tax-Number919863.exe	98

C:\Users\Admin\AppData\Local\Temp\Tax-Number919863.exe
"C:\Users\Admin\AppData\Local\Temp\Tax-Number919863.exe"
1⤵
- Drops file in Drivers directory
- Adds Run key to start application
- Suspicious use of SetThreadContext
- Suspicious use of WriteProcessMemory
PID:2204
- C:\Windows\Microsoft.NET\Framework\v4.0.30319\ngen.exe
  "C:\Windows\Microsoft.NET\Framework\v4.0.30319\ngen.exe"
  2⤵
  PID:1620
- C:\Windows\Microsoft.NET\Framework\v4.0.30319\ngen.exe
  "C:\Windows\Microsoft.NET\Framework\v4.0.30319\ngen.exe"
  2⤵
  PID:4776

C:\Windows\System32\drivers\pcdhost.sys
C:\Windows\System32\drivers\pcdhost.sys
1⤵
- Executes dropped EXE
PID:1472

C:\Windows\system32\cmd.exe
"cmd /c start "" /D "C:\ProgramData\USB3YTHS" Tax-Number919863.exe"
1⤵
- Suspicious use of WriteProcessMemory
PID:4804
- C:\ProgramData\USB3YTHS\Tax-Number919863.exe
  "C:\ProgramData\USB3YTHS\Tax-Number919863.exe"
  2⤵
  - Drops file in Drivers directory
  - Suspicious use of SetThreadContext
  - Executes dropped EXE
  - Loads dropped DLL
  - Suspicious use of WriteProcessMemory
  PID:1464
- - C:\Windows\Microsoft.NET\Framework\v4.0.30319\ngen.exe
    "C:\Windows\Microsoft.NET\Framework\v4.0.30319\ngen.exe"
    3⤵
    PID:2744
- - C:\Windows\Microsoft.NET\Framework\v4.0.30319\ngen.exe
    "C:\Windows\Microsoft.NET\Framework\v4.0.30319\ngen.exe"
    3⤵
    PID:1516

Network

MITRE ATT&CK Enterprise v16

Reconnaissance

Resource Development

Initial Access

Execution

Persistence

Boot or Logon Autostart Execution

T1547

Registry Run Keys / Startup Folder

T1547.001

Privilege Escalation

Boot or Logon Autostart Execution

T1547

Registry Run Keys / Startup Folder

T1547.001

Defense Evasion

Modify Registry

T1112

Credential Access

Discovery

System Information Discovery

T1082

Lateral Movement

Collection

Command and Control

Exfiltration

Impact

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Downloads

Tax-Number919863.exe

Path C:\ProgramData\USB3YTHS\Tax-Number919863.exe
Size 24KB
SHA256 233086e7d57e16523ac3463df306cfc497a9ba3c3e8268f62c8625ef56b2380e
MD5 3c305f878c678e9017e3e53fb6020283
SHA1 b8f157d19017065ccad21e5ceae21184d0fc3e5d
SHA512 7783d325bf738dbbc2a35545e2aa31d672dbab7e255720d83a9da66ce885eb0a60853211e95748f8bd3bcd3c470f2a9e8d10bb767b02f8a14511cec6e748e7ec
SSDEEP 384:8qRg0yFtNq5Awt9F7heZBLy8RbmL4nNyGu0:eFnq5xtgBL5AL10
TLSH
T1B8B27C67CE500CCBFE1A8AB0A0E59227FC32B6999ED1D3C35378C1550F513817A9A2E9
MD5 SHA1 SHA512 SSDEEP TLSH

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pcdhost.sys

Path C:\Windows\System32\drivers\pcdhost.sys
Size 17KB
SHA256 07c5209bf83065fe760f4fee4ed2308b0c523671f68ca73a3854c2c8c28c0541
MD5 826c6d2e3d80f2d43f7977f998525ad3
SHA1 7340eae2ccf3d57ac3ae271c9983996d8ae7fde0
SHA512 162954793c2e734fbbbef058b31d91de4df13c019af7c1f33135f0cd98113d0c88ea423faaabf435fd96b7bb002c51b6b4fc6ac1748eab131badb51866b59767
SSDEEP 192:JgvuYacCCpQIw9l0HKs0zTQxmnYe+PjP4wBjtlAv6YHmVm1OoG:JsuoCCpQIY0HKs0vkmnYPL4OUSYGVm1k
TLSH
T1BF826D8B476920AAFAE7C935C2A18677FC30FAD077564AFF4119C1911E81FE05B3D209
MD5 SHA1 SHA512 SSDEEP TLSH

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memory/1472-2-0x0000000000010000-0x0000000000017000-memory.dmp

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memory/1620-5-0x00000000007A0000-0x00000000007F0000-memory.dmp

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memory/2744-14-0x0000000000400000-0x0000000000450000-memory.dmp

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memory/4776-10-0x0000000000520000-0x0000000000570000-memory.dmp

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Analysis

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General

Malware Config

Extracted

Signatures

Processes

Network

MITRE ATT&CK Enterprise v16

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