90d6640dbe7472d2f1407157928adc1a33e932421479b47fc1458f7b98211e9b

Analysis

max time kernel
230s
max time network
360s
platform
windows7_x64
resource
win7-20221111-en
resource tags

arch:x64arch:x86image:win7-20221111-enlocale:en-usos:windows7-x64system
submitted
26-11-2022 23:03

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General

Target

90d6640dbe7472d2f1407157928adc1a33e932421479b47fc1458f7b98211e9b.exe
Size

194KB
MD5

1c754baf64c146c547328ac845238ab9
SHA1

c5069a7506c80831d91f2fadae11a3b6586c9e5e
SHA256

90d6640dbe7472d2f1407157928adc1a33e932421479b47fc1458f7b98211e9b
SHA512

8585d2d1fb0d16f9f5f9478fb100ef8d1826fe600f95f700261977d3e0d237fb425abfc8dd28d84fe53ed9d73527b6363f681c5bce74dbd559ae7f8e110cd393
SSDEEP

6144:HDHyVG/j8MmXN6DV5sPYOI+oZCSaRpJ/mir:jSs/AMmXoD3uYOImSaRHuir

Score

8^/10

persistence

Malware Config

Signatures

Executes dropped EXE 1 IoCs

Processes:

steamwebhelper.exe

pid process

1548 steamwebhelper.exe

pid	process
1548	steamwebhelper.exe

Adds Run key to start application 2 TTPs 2 IoCs

persistence

Registry Run Keys / Startup Folder

T1060

Modify Registry

T1112

Processes:

90d6640dbe7472d2f1407157928adc1a33e932421479b47fc1458f7b98211e9b.exesteamwebhelper.exe

description	ioc	process
Set value (str)	\REGISTRY\MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Run\steamwebhelper = "C:\\Users\\Admin\\AppData\\Roaming\\steamwebhelper2\\steamwebhelper.exe"	90d6640dbe7472d2f1407157928adc1a33e932421479b47fc1458f7b98211e9b.exe
Set value (str)	\REGISTRY\MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Run\steamwebhelper = "C:\\Users\\Admin\\AppData\\Roaming\\steamwebhelper2\\steamwebhelper.exe"	steamwebhelper.exe

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

System Information Discovery
T1082
Suspicious behavior: EnumeratesProcesses 2 IoCs

Processes:

90d6640dbe7472d2f1407157928adc1a33e932421479b47fc1458f7b98211e9b.exesteamwebhelper.exe

pid process

1972 90d6640dbe7472d2f1407157928adc1a33e932421479b47fc1458f7b98211e9b.exe
1548 steamwebhelper.exe

pid	process
1972	90d6640dbe7472d2f1407157928adc1a33e932421479b47fc1458f7b98211e9b.exe
1548	steamwebhelper.exe

Suspicious use of AdjustPrivilegeToken 2 IoCs

Processes:

90d6640dbe7472d2f1407157928adc1a33e932421479b47fc1458f7b98211e9b.exesteamwebhelper.exe

description	pid	process
Token: SeDebugPrivilege	1972	90d6640dbe7472d2f1407157928adc1a33e932421479b47fc1458f7b98211e9b.exe
Token: SeDebugPrivilege	1548	steamwebhelper.exe

Suspicious use of WriteProcessMemory 3 IoCs

Processes:

90d6640dbe7472d2f1407157928adc1a33e932421479b47fc1458f7b98211e9b.exe

description	pid	process	target process
PID 1972 wrote to memory of 1548	1972	90d6640dbe7472d2f1407157928adc1a33e932421479b47fc1458f7b98211e9b.exe	steamwebhelper.exe
PID 1972 wrote to memory of 1548	1972	90d6640dbe7472d2f1407157928adc1a33e932421479b47fc1458f7b98211e9b.exe	steamwebhelper.exe
PID 1972 wrote to memory of 1548	1972	90d6640dbe7472d2f1407157928adc1a33e932421479b47fc1458f7b98211e9b.exe	steamwebhelper.exe

C:\Users\Admin\AppData\Local\Temp\90d6640dbe7472d2f1407157928adc1a33e932421479b47fc1458f7b98211e9b.exe
"C:\Users\Admin\AppData\Local\Temp\90d6640dbe7472d2f1407157928adc1a33e932421479b47fc1458f7b98211e9b.exe"
1⤵
- Adds Run key to start application
- Suspicious behavior: EnumeratesProcesses
- Suspicious use of AdjustPrivilegeToken
- Suspicious use of WriteProcessMemory
PID:1972

C:\Users\Admin\AppData\Roaming\steamwebhelper2\steamwebhelper.exe
"C:\Users\Admin\AppData\Roaming\steamwebhelper2\steamwebhelper.exe"
2⤵
- Executes dropped EXE
- Adds Run key to start application
- Suspicious behavior: EnumeratesProcesses
- Suspicious use of AdjustPrivilegeToken
PID:1548

Network

MITRE ATT&CK Matrix ATT&CK v6

Initial Access

Execution

Persistence

Registry Run Keys / Startup Folder

T1060

Privilege Escalation

Defense Evasion

Modify Registry

T1112

Credential Access

Discovery

System Information Discovery

T1082

Lateral Movement

Collection

Exfiltration

Command and Control

Impact

Replay Monitor

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Downloads

C:\Users\Admin\AppData\Roaming\steamwebhelper2\steamwebhelper.exe
Filesize
194KB

MD5
1c754baf64c146c547328ac845238ab9

SHA1
c5069a7506c80831d91f2fadae11a3b6586c9e5e

SHA256
90d6640dbe7472d2f1407157928adc1a33e932421479b47fc1458f7b98211e9b

SHA512
8585d2d1fb0d16f9f5f9478fb100ef8d1826fe600f95f700261977d3e0d237fb425abfc8dd28d84fe53ed9d73527b6363f681c5bce74dbd559ae7f8e110cd393

Download Submit
C:\Users\Admin\AppData\Roaming\steamwebhelper2\steamwebhelper.exe
Filesize
194KB

MD5
1c754baf64c146c547328ac845238ab9

SHA1
c5069a7506c80831d91f2fadae11a3b6586c9e5e

SHA256
90d6640dbe7472d2f1407157928adc1a33e932421479b47fc1458f7b98211e9b

SHA512
8585d2d1fb0d16f9f5f9478fb100ef8d1826fe600f95f700261977d3e0d237fb425abfc8dd28d84fe53ed9d73527b6363f681c5bce74dbd559ae7f8e110cd393

Download Submit
memory/1548-57-0x0000000000000000-mapping.dmp

Download
memory/1548-61-0x0000000000E20000-0x0000000000E56000-memory.dmp

Filesize
216KB

Download
memory/1972-54-0x0000000000DB0000-0x0000000000DE6000-memory.dmp

Filesize
216KB

Download
memory/1972-55-0x0000000000150000-0x0000000000156000-memory.dmp

Filesize
24KB

Download
memory/1972-56-0x000007FEFB691000-0x000007FEFB693000-memory.dmp

Filesize
8KB

Download
memory/1972-60-0x000000001A996000-0x000000001A9B5000-memory.dmp

Filesize
124KB

Download