valleyrat_s2 | bf5ffeea7173c189bc75a34c6c02620095f6a79ebf67fcd97b6613ab5e079a44

Analysis

max time kernel
149s
max time network
144s
platform
windows11-21h2_x64
resource
win11-20260513-en
resource tags

arch:x64arch:x86image:win11-20260513-enlocale:en-usos:windows11-21h2-x64systemwindows
submitted
18/05/2026, 21:45

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General

Target
chgport.exe
Size 1.2MB
Sample260518-1mappads7t
SHA256 bf5ffeea7173c189bc75a34c6c02620095f6a79ebf67fcd97b6613ab5e079a44
MD5 84422fbf18741da15be2fa707292d2d9
SHA1 110f5742be29c2ac0180e981755443d9f348f975
SHA512 e0478926d3e75e3ea9a02249ae2e00a0fdd4e156e5a313ba05bf0eb819aed55a3775c176cac5c511070ecf07999b59e66ae4826eb2b0a4b3048af7528b13d0a1
SSDEEP 12288:8lGhLRQq3BIgCTfDITlP6NG7qcmfT59n47G5+4:BzRIgK4p6w7qcknyG5T
TLSH
T129455C5A666080E0F162C33AC5718A97F7727C611BE1A3DB16A4B39E5F376D40E39332
MD5 SHA1 SHA512 SSDEEP TLSH

Score

10^/10

backdoor valleyrat_s2 persistence ransomware

Malware Config

Extracted

Family

valleyrat_s2

Version

2026. 5.12

103.54.60.154:5050
103.54.60.154:6666
103.54.60.154:8888

Attributes

campaign_date
2026. 5.12

Signatures

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

Badlisted process makes network request 2 IoCs

Network request originating from process or tool commonly abused by malware.

flow	pid	Process
1	3244	rundll32.exe
2	3244	rundll32.exe

Enumerates connected drives 3 TTPs 22 IoCs

Attempts to read the root path of hard drives other than the default C: drive.

Query Registry

T1012

Peripheral Device Discovery

T1120

System Information Discovery

T1082

description	ioc	Process
File opened (read-only)	\??\K:	rundll32.exe
File opened (read-only)	\??\M:	rundll32.exe
File opened (read-only)	\??\R:	rundll32.exe
File opened (read-only)	\??\T:	rundll32.exe
File opened (read-only)	\??\V:	rundll32.exe
File opened (read-only)	\??\X:	rundll32.exe
File opened (read-only)	\??\H:	rundll32.exe
File opened (read-only)	\??\J:	rundll32.exe
File opened (read-only)	\??\L:	rundll32.exe
File opened (read-only)	\??\N:	rundll32.exe
File opened (read-only)	\??\S:	rundll32.exe
File opened (read-only)	\??\Z:	rundll32.exe
File opened (read-only)	\??\Q:	rundll32.exe
File opened (read-only)	\??\W:	rundll32.exe
File opened (read-only)	\??\Y:	rundll32.exe
File opened (read-only)	\??\E:	rundll32.exe
File opened (read-only)	\??\I:	rundll32.exe
File opened (read-only)	\??\O:	rundll32.exe
File opened (read-only)	\??\P:	rundll32.exe
File opened (read-only)	\??\U:	rundll32.exe
File opened (read-only)	\??\B:	rundll32.exe
File opened (read-only)	\??\G:	rundll32.exe

Suspicious use of SetThreadContext 1 IoCs

description	pid	Process	procid_target
PID 3088 set thread context of 3244	3088	chgport.exe	80

Modifies registry class 5 IoCs

description	ioc	Process
Key created	\REGISTRY\MACHINE\Software\Classes\Local Settings\Software\Microsoft\Windows\CurrentVersion\AppModel\Deployment\Package\*\S-1-5-21-1768642833-2142038154-4041560723-1000\{06C8B17A-F41C-4400-9180-321E3F895BFA}	rundll32.exe
Key created	\REGISTRY\USER\S-1-5-21-1768642833-2142038154-4041560723-1000_Classes\5751ecf18bc996823a2bb0d61cba46e6	rundll32.exe
Key created	\REGISTRY\USER\S-1-5-21-1768642833-2142038154-4041560723-1000_Classes\5751ecf18bc996823a2bb0d61cba46e6\0	rundll32.exe
Key created	\REGISTRY\USER\S-1-5-21-1768642833-2142038154-4041560723-1000_Classes\5751ecf18bc996823a2bb0d61cba46e6\1	rundll32.exe
Set value (int)	\REGISTRY\USER\S-1-5-21-1768642833-2142038154-4041560723-1000_Classes\5751ecf18bc996823a2bb0d61cba46e6\i = "1779233740"	rundll32.exe

Suspicious behavior: EnumeratesProcesses 64 IoCs

pid	Process
3088	chgport.exe
3088	chgport.exe
3244	rundll32.exe
3244	rundll32.exe
3244	rundll32.exe
3244	rundll32.exe
3244	rundll32.exe
3244	rundll32.exe
3244	rundll32.exe
3244	rundll32.exe
3244	rundll32.exe
3244	rundll32.exe
3244	rundll32.exe
3244	rundll32.exe
3244	rundll32.exe
3244	rundll32.exe
3244	rundll32.exe
3244	rundll32.exe
3244	rundll32.exe
3244	rundll32.exe
3244	rundll32.exe
3244	rundll32.exe
3244	rundll32.exe
3244	rundll32.exe
3244	rundll32.exe
3244	rundll32.exe
3244	rundll32.exe
3244	rundll32.exe
3244	rundll32.exe
3244	rundll32.exe
3244	rundll32.exe
3244	rundll32.exe
3244	rundll32.exe
3244	rundll32.exe
3244	rundll32.exe
3244	rundll32.exe
3244	rundll32.exe
3244	rundll32.exe
3244	rundll32.exe
3244	rundll32.exe
3244	rundll32.exe
3244	rundll32.exe
3244	rundll32.exe
3244	rundll32.exe
3244	rundll32.exe
3244	rundll32.exe
3244	rundll32.exe
3244	rundll32.exe
3244	rundll32.exe
3244	rundll32.exe
3244	rundll32.exe
3244	rundll32.exe
3244	rundll32.exe
3244	rundll32.exe
3244	rundll32.exe
3244	rundll32.exe
3244	rundll32.exe
3244	rundll32.exe
3244	rundll32.exe
3244	rundll32.exe
3244	rundll32.exe
3244	rundll32.exe
3244	rundll32.exe
3244	rundll32.exe

Suspicious use of WriteProcessMemory 2 IoCs

description	pid	Process	procid_target
PID 3088 wrote to memory of 3244	3088	chgport.exe	80
PID 3088 wrote to memory of 3244	3088	chgport.exe	80

Uses Task Scheduler COM API 1 TTPs
The Task Scheduler COM API can be used to schedule applications to run on boot or at set times.
persistence

Query Registry
T1012
Uses Volume Shadow Copy WMI provider
The Volume Shadow Copy service is used to manage backups/snapshots.
ransomware
Uses Volume Shadow Copy service COM API
The Volume Shadow Copy service is used to manage backups/snapshots.
ransomware

C:\Users\Admin\AppData\Local\Temp\chgport.exe
"C:\Users\Admin\AppData\Local\Temp\chgport.exe"
1⤵
- Suspicious use of SetThreadContext
- Suspicious behavior: EnumeratesProcesses
- Suspicious use of WriteProcessMemory
PID:3088
- C:\Windows\SYSTEM32\rundll32.exe
  rundll32.exe
  2⤵
  - Badlisted process makes network request
  - Enumerates connected drives
  - Modifies registry class
  - Suspicious behavior: EnumeratesProcesses
  PID:3244

Network

MITRE ATT&CK Enterprise v16

Reconnaissance

Resource Development

Initial Access

Execution

Persistence

Privilege Escalation

Defense Evasion

Credential Access

Discovery

Peripheral Device Discovery

T1120

Query Registry

T1012

System Information Discovery

T1082

Lateral Movement

Collection

Command and Control

Exfiltration

Impact

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Downloads

memory/3244-0-0x0000020508630000-0x000002050865D000-memory.dmp

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memory/3244-1-0x0000020508630000-0x000002050865D000-memory.dmp

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memory/3244-2-0x0000020508630000-0x000002050865D000-memory.dmp

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memory/3244-3-0x0000020508630000-0x000002050865D000-memory.dmp

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memory/3244-7-0x000002050A370000-0x000002050A3C2000-memory.dmp

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memory/3244-6-0x000002050A370000-0x000002050A3C2000-memory.dmp

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memory/3244-5-0x000002050A320000-0x000002050A36C000-memory.dmp

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memory/3244-4-0x0000020508630000-0x000002050865D000-memory.dmp

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memory/3244-8-0x000002050A370000-0x000002050A3C2000-memory.dmp

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memory/3244-9-0x000002050A370000-0x000002050A3C2000-memory.dmp

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memory/3244-10-0x000002050A370000-0x000002050A3C2000-memory.dmp

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memory/3244-11-0x0000020508630000-0x000002050865D000-memory.dmp

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memory/3244-12-0x0000020508630000-0x000002050865D000-memory.dmp

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memory/3244-13-0x000002050A370000-0x000002050A3C2000-memory.dmp

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