036a39a60d6447338c92ebae426124e4c93920d64ddecf73f5c1b290924a4f59

Analysis

max time kernel
150s
max time network
156s
platform
windows10-2004_x64
resource
win10v2004-20231215-en
resource tags

arch:x64arch:x86image:win10v2004-20231215-enlocale:en-usos:windows10-2004-x64system
submitted
05/01/2024, 08:58

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General

Target

43478d28704cadc0db6571dc2e6fa96f.exe
Size

13KB
MD5

43478d28704cadc0db6571dc2e6fa96f
SHA1

b62680eacb847f98a53af00901eafac6b287ef2b
SHA256

036a39a60d6447338c92ebae426124e4c93920d64ddecf73f5c1b290924a4f59
SHA512

ca2e5fac347ba8a03b351531787528644eae85dc032b9bfccf3e254397bddb992b33c88b2fe9de17bd23e1ae2805f5626d600ebe12fb29c98bca3b2f95edbcfc
SSDEEP

192:T2Uq4pEMfiymuqbjzDbiZFGyknlLfP1oynG0JS0ATUBb9Lru8LTP3N:KX4lfiymuqbPqFAnlb1jkUt9Lru0TP9

Score

7^/10

persistence

Malware Config

Signatures

Deletes itself 1 IoCs

pid	Process
2540	wsttrs.exe

Executes dropped EXE 1 IoCs

pid	Process
2540	wsttrs.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\WOW6432Node\Microsoft\Windows\CurrentVersion\Run\wsttrs = "C:\\Windows\\wsttrs.exe"	wsttrs.exe

Drops file in System32 directory 1 IoCs

description	ioc	Process
File created	C:\Windows\SysWOW64\wsttrs.dll	wsttrs.exe

Drops file in Windows directory 2 IoCs

description	ioc	Process
File created	C:\Windows\wsttrs.exe	43478d28704cadc0db6571dc2e6fa96f.exe
File opened for modification	C:\Windows\wsttrs.exe	43478d28704cadc0db6571dc2e6fa96f.exe

Suspicious behavior: EnumeratesProcesses 2 IoCs

pid	Process
2540	wsttrs.exe
2540	wsttrs.exe

Suspicious use of AdjustPrivilegeToken 2 IoCs

description	pid	Process
Token: SeDebugPrivilege	3248	43478d28704cadc0db6571dc2e6fa96f.exe
Token: SeDebugPrivilege	2540	wsttrs.exe

Suspicious use of WriteProcessMemory 5 IoCs

description	pid	Process	procid_target
PID 3248 wrote to memory of 2540	3248	43478d28704cadc0db6571dc2e6fa96f.exe	44
PID 3248 wrote to memory of 2540	3248	43478d28704cadc0db6571dc2e6fa96f.exe	44
PID 3248 wrote to memory of 2540	3248	43478d28704cadc0db6571dc2e6fa96f.exe	44
PID 2540 wrote to memory of 3448	2540	wsttrs.exe	47
PID 2540 wrote to memory of 3448	2540	wsttrs.exe	47

C:\Users\Admin\AppData\Local\Temp\43478d28704cadc0db6571dc2e6fa96f.exe
"C:\Users\Admin\AppData\Local\Temp\43478d28704cadc0db6571dc2e6fa96f.exe"
1⤵
- Drops file in Windows directory
- Suspicious use of AdjustPrivilegeToken
- Suspicious use of WriteProcessMemory
PID:3248
- C:\Windows\wsttrs.exe
  C:\Windows\wsttrs.exe @C:\Users\Admin\AppData\Local\Temp\43478d28704cadc0db6571dc2e6fa96f.exe@3248
  2⤵
  - Deletes itself
  - Executes dropped EXE
  - Adds Run key to start application
  - Drops file in System32 directory
  - Suspicious behavior: EnumeratesProcesses
  - Suspicious use of AdjustPrivilegeToken
  - Suspicious use of WriteProcessMemory
  PID:2540

C:\Windows\Explorer.EXE
C:\Windows\Explorer.EXE
1⤵
PID:3448

Network

MITRE ATT&CK Enterprise v15

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

Lateral Movement

Collection

Command and Control

Exfiltration

Impact

Replay Monitor

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Downloads

C:\Windows\wsttrs.exe

Filesize
13KB

MD5
43478d28704cadc0db6571dc2e6fa96f

SHA1
b62680eacb847f98a53af00901eafac6b287ef2b

SHA256
036a39a60d6447338c92ebae426124e4c93920d64ddecf73f5c1b290924a4f59

SHA512
ca2e5fac347ba8a03b351531787528644eae85dc032b9bfccf3e254397bddb992b33c88b2fe9de17bd23e1ae2805f5626d600ebe12fb29c98bca3b2f95edbcfc

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