a50b5c82f9725549a6c4cd0fd781b1a734961ddfc71cd9dac7ff0a83bffcd623

Analysis

max time kernel
90s
max time network
154s
platform
windows10-2004_x64
resource
win10v2004-20220901-en
resource tags

arch:x64arch:x86image:win10v2004-20220901-enlocale:en-usos:windows10-2004-x64system
submitted
24-11-2022 21:16

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General

Target

a50b5c82f9725549a6c4cd0fd781b1a734961ddfc71cd9dac7ff0a83bffcd623.exe
Size

224KB
MD5

5f36d6c3ca325874af64350a4a8ca699
SHA1

fc5250b3aa0809fe4fc27dcd5e72a6f8b751673c
SHA256

a50b5c82f9725549a6c4cd0fd781b1a734961ddfc71cd9dac7ff0a83bffcd623
SHA512

a842b8c8a51bb867bb0cadd170df234e311e361f4eb17780d4418299af20d166a4a7b0ffcf072dfb1012147435459562c2b2271edb72b11fac6dca1cf0923d16
SSDEEP

6144:frWoO2IKJ7Uk3JvegqMHIlEO+RXA4YIwn:iotRgUJvegDAV+l6Iwn

Score

8^/10

persistence

Malware Config

Signatures

Executes dropped EXE 1 IoCs

Processes:

steamwebhelper.exe

pid process

3496 steamwebhelper.exe

pid	process
3496	steamwebhelper.exe

Checks computer location settings 2 TTPs 1 IoCs

Looks up country code configured in the registry, likely geofence.

Query Registry

T1012

System Information Discovery

T1082

Processes:

a50b5c82f9725549a6c4cd0fd781b1a734961ddfc71cd9dac7ff0a83bffcd623.exe

description	ioc	process
Key value queried	\REGISTRY\USER\S-1-5-21-929662420-1054238289-2961194603-1000\Control Panel\International\Geo\Nation	a50b5c82f9725549a6c4cd0fd781b1a734961ddfc71cd9dac7ff0a83bffcd623.exe

Adds Run key to start application 2 TTPs 2 IoCs

persistence

Registry Run Keys / Startup Folder

T1060

Modify Registry

T1112

Processes:

a50b5c82f9725549a6c4cd0fd781b1a734961ddfc71cd9dac7ff0a83bffcd623.exesteamwebhelper.exe

description	ioc	process
Set value (str)	\REGISTRY\MACHINE\SOFTWARE\WOW6432Node\Microsoft\Windows\CurrentVersion\Run\steamwebhelper = "C:\\Users\\Admin\\AppData\\Roaming\\steamwebhelper2\\steamwebhelper.exe"	a50b5c82f9725549a6c4cd0fd781b1a734961ddfc71cd9dac7ff0a83bffcd623.exe
Set value (str)	\REGISTRY\MACHINE\SOFTWARE\WOW6432Node\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:

a50b5c82f9725549a6c4cd0fd781b1a734961ddfc71cd9dac7ff0a83bffcd623.exesteamwebhelper.exe

pid process

4960 a50b5c82f9725549a6c4cd0fd781b1a734961ddfc71cd9dac7ff0a83bffcd623.exe
3496 steamwebhelper.exe

pid	process
4960	a50b5c82f9725549a6c4cd0fd781b1a734961ddfc71cd9dac7ff0a83bffcd623.exe
3496	steamwebhelper.exe

Suspicious use of AdjustPrivilegeToken 2 IoCs

Processes:

a50b5c82f9725549a6c4cd0fd781b1a734961ddfc71cd9dac7ff0a83bffcd623.exesteamwebhelper.exe

description	pid	process
Token: SeDebugPrivilege	4960	a50b5c82f9725549a6c4cd0fd781b1a734961ddfc71cd9dac7ff0a83bffcd623.exe
Token: SeDebugPrivilege	3496	steamwebhelper.exe

Suspicious use of WriteProcessMemory 3 IoCs

Processes:

a50b5c82f9725549a6c4cd0fd781b1a734961ddfc71cd9dac7ff0a83bffcd623.exe

description	pid	process	target process
PID 4960 wrote to memory of 3496	4960	a50b5c82f9725549a6c4cd0fd781b1a734961ddfc71cd9dac7ff0a83bffcd623.exe	steamwebhelper.exe
PID 4960 wrote to memory of 3496	4960	a50b5c82f9725549a6c4cd0fd781b1a734961ddfc71cd9dac7ff0a83bffcd623.exe	steamwebhelper.exe
PID 4960 wrote to memory of 3496	4960	a50b5c82f9725549a6c4cd0fd781b1a734961ddfc71cd9dac7ff0a83bffcd623.exe	steamwebhelper.exe

C:\Users\Admin\AppData\Local\Temp\a50b5c82f9725549a6c4cd0fd781b1a734961ddfc71cd9dac7ff0a83bffcd623.exe
"C:\Users\Admin\AppData\Local\Temp\a50b5c82f9725549a6c4cd0fd781b1a734961ddfc71cd9dac7ff0a83bffcd623.exe"
1⤵
- Checks computer location settings
- Adds Run key to start application
- Suspicious behavior: EnumeratesProcesses
- Suspicious use of AdjustPrivilegeToken
- Suspicious use of WriteProcessMemory
PID:4960

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:3496

Network

MITRE ATT&CK Enterprise v6

Initial Access

Execution

Persistence

Registry Run Keys / Startup Folder

T1060

Privilege Escalation

Defense Evasion

Modify Registry

T1112

Credential Access

Discovery

Query Registry

T1012

System Information Discovery

T1082

Lateral Movement

Collection

Command and Control

Exfiltration

Impact

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Downloads

C:\Users\Admin\AppData\Roaming\steamwebhelper2\steamwebhelper.exe
Filesize
224KB

MD5
5f36d6c3ca325874af64350a4a8ca699

SHA1
fc5250b3aa0809fe4fc27dcd5e72a6f8b751673c

SHA256
a50b5c82f9725549a6c4cd0fd781b1a734961ddfc71cd9dac7ff0a83bffcd623

SHA512
a842b8c8a51bb867bb0cadd170df234e311e361f4eb17780d4418299af20d166a4a7b0ffcf072dfb1012147435459562c2b2271edb72b11fac6dca1cf0923d16

Download Submit
C:\Users\Admin\AppData\Roaming\steamwebhelper2\steamwebhelper.exe
Filesize
224KB

MD5
5f36d6c3ca325874af64350a4a8ca699

SHA1
fc5250b3aa0809fe4fc27dcd5e72a6f8b751673c

SHA256
a50b5c82f9725549a6c4cd0fd781b1a734961ddfc71cd9dac7ff0a83bffcd623

SHA512
a842b8c8a51bb867bb0cadd170df234e311e361f4eb17780d4418299af20d166a4a7b0ffcf072dfb1012147435459562c2b2271edb72b11fac6dca1cf0923d16

Download Submit
memory/3496-136-0x0000000000000000-mapping.dmp

Download
memory/4960-132-0x0000000000960000-0x000000000099E000-memory.dmp

Filesize
248KB

Download
memory/4960-133-0x0000000005DE0000-0x0000000006384000-memory.dmp

Filesize
5.6MB

Download
memory/4960-134-0x0000000005930000-0x00000000059C2000-memory.dmp

Filesize
584KB

Download
memory/4960-135-0x0000000005AE0000-0x0000000005AEA000-memory.dmp

Filesize
40KB

Download