systembc | 145dbb397089105d6d06a861d62b48be9fd2527fb7d023b114cf05b723cd3858

Analysis

max time kernel
131s
max time network
141s
platform
windows10-2004_x64
resource
win10v2004-20240802-en
resource tags

arch:x64arch:x86image:win10v2004-20240802-enlocale:en-usos:windows10-2004-x64system
submitted
29-08-2024 15:40

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General

Target

Cbmefxrmnv.exe
Size

2.0MB
MD5

170fb4fa36de83de39a9e228f17b0060
SHA1

4a9ee216442b6fc98152fe9e80e763d95caede6c
SHA256

145dbb397089105d6d06a861d62b48be9fd2527fb7d023b114cf05b723cd3858
SHA512

168f389ce7dd0a7feacf6505c1a52a6743900974dd11af86b2e07998817b2021f62dec0b00daffbc212fd51337500fa9ff1d669d708103de2337195db936ee8f
SSDEEP

24576:qM7wJrWiSgXXHgdjvYiKs7KHxGoz8oVWtnq4cPgv07ZNAqbJBO+kLQL3cOEKFHt:r7wJVSoFL3cYFH

Score

10^/10

systembc discovery persistence trojan

Malware Config

Extracted

Family

systembc

claywyaeropumps.com

185.43.220.45

Attributes

dns
5.132.191.104

Signatures

SystemBC
SystemBC is a proxy and remote administration tool first seen in 2019.
trojan systembc
Executes dropped EXE 4 IoCs

Processes:

mevvsdo.exemevvsdo.exemevvsdo.exemevvsdo.exe

pid process

5396 mevvsdo.exe
5592 mevvsdo.exe
5900 mevvsdo.exe
5104 mevvsdo.exe

pid	process
5396	mevvsdo.exe
5592	mevvsdo.exe
5900	mevvsdo.exe
5104	mevvsdo.exe

Adds Run key to start application 2 TTPs 1 IoCs

persistence

Registry Run Keys / Startup Folder

T1547.001

Modify Registry

T1112

Processes:

Cbmefxrmnv.exe

description	ioc	process
Set value (str)	\REGISTRY\USER\S-1-5-21-656926755-4116854191-210765258-1000\SOFTWARE\Microsoft\Windows\CurrentVersion\Run\VolumeInfo = "C:\\Users\\Admin\\AppData\\Roaming\\VolumeInfo.exe"	Cbmefxrmnv.exe

Suspicious use of SetThreadContext 3 IoCs

Processes:

Cbmefxrmnv.exemevvsdo.exemevvsdo.exe

description	pid	process	target process
PID 2944 set thread context of 3508	2944	Cbmefxrmnv.exe	Cbmefxrmnv.exe
PID 5396 set thread context of 5592	5396	mevvsdo.exe	mevvsdo.exe
PID 5900 set thread context of 5104	5900	mevvsdo.exe	mevvsdo.exe

Drops file in Windows directory 1 IoCs

Processes:

Cbmefxrmnv.exe

description ioc process

File created C:\Windows\Tasks\Test Task17.job Cbmefxrmnv.exe

description	ioc	process
File created	C:\Windows\Tasks\Test Task17.job	Cbmefxrmnv.exe

System Location Discovery: System Language Discovery 1 TTPs 6 IoCs

Attempt gather information about the system language of a victim in order to infer the geographical location of that host.

discovery

System Language Discovery

T1614.001

Processes:

mevvsdo.exemevvsdo.exemevvsdo.exemevvsdo.exeCbmefxrmnv.exeCbmefxrmnv.exe

description	ioc	process
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	mevvsdo.exe
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	mevvsdo.exe
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	mevvsdo.exe
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	mevvsdo.exe
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	Cbmefxrmnv.exe
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	Cbmefxrmnv.exe

Suspicious use of AdjustPrivilegeToken 6 IoCs

Processes:

Cbmefxrmnv.exemevvsdo.exemevvsdo.exe

description	pid	process
Token: SeDebugPrivilege	2944	Cbmefxrmnv.exe
Token: SeDebugPrivilege	2944	Cbmefxrmnv.exe
Token: SeDebugPrivilege	5396	mevvsdo.exe
Token: SeDebugPrivilege	5396	mevvsdo.exe
Token: SeDebugPrivilege	5900	mevvsdo.exe
Token: SeDebugPrivilege	5900	mevvsdo.exe

Suspicious use of WriteProcessMemory 24 IoCs

Processes:

Cbmefxrmnv.exemevvsdo.exemevvsdo.exe

description	pid	process	target process
PID 2944 wrote to memory of 3508	2944	Cbmefxrmnv.exe	Cbmefxrmnv.exe
PID 2944 wrote to memory of 3508	2944	Cbmefxrmnv.exe	Cbmefxrmnv.exe
PID 2944 wrote to memory of 3508	2944	Cbmefxrmnv.exe	Cbmefxrmnv.exe
PID 2944 wrote to memory of 3508	2944	Cbmefxrmnv.exe	Cbmefxrmnv.exe
PID 2944 wrote to memory of 3508	2944	Cbmefxrmnv.exe	Cbmefxrmnv.exe
PID 2944 wrote to memory of 3508	2944	Cbmefxrmnv.exe	Cbmefxrmnv.exe
PID 2944 wrote to memory of 3508	2944	Cbmefxrmnv.exe	Cbmefxrmnv.exe
PID 2944 wrote to memory of 3508	2944	Cbmefxrmnv.exe	Cbmefxrmnv.exe
PID 5396 wrote to memory of 5592	5396	mevvsdo.exe	mevvsdo.exe
PID 5396 wrote to memory of 5592	5396	mevvsdo.exe	mevvsdo.exe
PID 5396 wrote to memory of 5592	5396	mevvsdo.exe	mevvsdo.exe
PID 5396 wrote to memory of 5592	5396	mevvsdo.exe	mevvsdo.exe
PID 5396 wrote to memory of 5592	5396	mevvsdo.exe	mevvsdo.exe
PID 5396 wrote to memory of 5592	5396	mevvsdo.exe	mevvsdo.exe
PID 5396 wrote to memory of 5592	5396	mevvsdo.exe	mevvsdo.exe
PID 5396 wrote to memory of 5592	5396	mevvsdo.exe	mevvsdo.exe
PID 5900 wrote to memory of 5104	5900	mevvsdo.exe	mevvsdo.exe
PID 5900 wrote to memory of 5104	5900	mevvsdo.exe	mevvsdo.exe
PID 5900 wrote to memory of 5104	5900	mevvsdo.exe	mevvsdo.exe
PID 5900 wrote to memory of 5104	5900	mevvsdo.exe	mevvsdo.exe
PID 5900 wrote to memory of 5104	5900	mevvsdo.exe	mevvsdo.exe
PID 5900 wrote to memory of 5104	5900	mevvsdo.exe	mevvsdo.exe
PID 5900 wrote to memory of 5104	5900	mevvsdo.exe	mevvsdo.exe
PID 5900 wrote to memory of 5104	5900	mevvsdo.exe	mevvsdo.exe

C:\Users\Admin\AppData\Local\Temp\Cbmefxrmnv.exe
"C:\Users\Admin\AppData\Local\Temp\Cbmefxrmnv.exe"
1⤵
- Adds Run key to start application
- Suspicious use of SetThreadContext
- System Location Discovery: System Language Discovery
- Suspicious use of AdjustPrivilegeToken
- Suspicious use of WriteProcessMemory
PID:2944
- C:\Users\Admin\AppData\Local\Temp\Cbmefxrmnv.exe
  "C:\Users\Admin\AppData\Local\Temp\Cbmefxrmnv.exe"
  2⤵
  - Drops file in Windows directory
  - System Location Discovery: System Language Discovery
  PID:3508

C:\ProgramData\umfat\mevvsdo.exe
C:\ProgramData\umfat\mevvsdo.exe
1⤵
- Executes dropped EXE
- Suspicious use of SetThreadContext
- System Location Discovery: System Language Discovery
- Suspicious use of AdjustPrivilegeToken
- Suspicious use of WriteProcessMemory
PID:5396
- C:\ProgramData\umfat\mevvsdo.exe
  "C:\ProgramData\umfat\mevvsdo.exe"
  2⤵
  - Executes dropped EXE
  - System Location Discovery: System Language Discovery
  PID:5592

C:\ProgramData\umfat\mevvsdo.exe
C:\ProgramData\umfat\mevvsdo.exe
1⤵
- Executes dropped EXE
- Suspicious use of SetThreadContext
- System Location Discovery: System Language Discovery
- Suspicious use of AdjustPrivilegeToken
- Suspicious use of WriteProcessMemory
PID:5900
- C:\ProgramData\umfat\mevvsdo.exe
  "C:\ProgramData\umfat\mevvsdo.exe"
  2⤵
  - Executes dropped EXE
  - System Location Discovery: System Language Discovery
  PID:5104

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

System Location Discovery

T1614

System Language Discovery

T1614.001

Lateral Movement

Collection

Command and Control

Exfiltration

Impact

Replay Monitor

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Downloads

C:\ProgramData\umfat\mevvsdo.exe

Filesize
2.0MB

MD5
170fb4fa36de83de39a9e228f17b0060

SHA1
4a9ee216442b6fc98152fe9e80e763d95caede6c

SHA256
145dbb397089105d6d06a861d62b48be9fd2527fb7d023b114cf05b723cd3858

SHA512
168f389ce7dd0a7feacf6505c1a52a6743900974dd11af86b2e07998817b2021f62dec0b00daffbc212fd51337500fa9ff1d669d708103de2337195db936ee8f

Download Submit
C:\Windows\Tasks\Test Task17.job

Filesize
238B

MD5
d72f3ee74f9957a0b7d32f152eb28e7c

SHA1
9a44944297518a7ae8ed62a1a4333e0a9230114a

SHA256
e2d85fca6603372d938d48764f4e450c95e7dcfdf39ba18f640b5ed714c316d5

SHA512
baef66d30ece196f24ed716a950586cf2d339130c5f98a2bc2c091a53ad5c51743474a9f338ee686c8a6f6ad00a2e37dddc6c7dc457c49e9414fc6f6c2877e49

Download Submit
memory/2944-0-0x00000000749AE000-0x00000000749AF000-memory.dmp

Filesize
4KB

Download
memory/2944-1-0x0000000000D40000-0x0000000000F52000-memory.dmp

Filesize
2.1MB

Download
memory/2944-2-0x0000000005A50000-0x0000000005B26000-memory.dmp

Filesize
856KB

Download
memory/2944-16-0x0000000005A50000-0x0000000005B21000-memory.dmp

Filesize
836KB

Download
memory/2944-18-0x0000000005A50000-0x0000000005B21000-memory.dmp

Filesize
836KB

Download
memory/2944-66-0x0000000005A50000-0x0000000005B21000-memory.dmp

Filesize
836KB

Download
memory/2944-64-0x0000000005A50000-0x0000000005B21000-memory.dmp

Filesize
836KB

Download
memory/2944-62-0x0000000005A50000-0x0000000005B21000-memory.dmp

Filesize
836KB

Download
memory/2944-60-0x0000000005A50000-0x0000000005B21000-memory.dmp

Filesize
836KB

Download
memory/2944-58-0x0000000005A50000-0x0000000005B21000-memory.dmp

Filesize
836KB

Download
memory/2944-56-0x0000000005A50000-0x0000000005B21000-memory.dmp

Filesize
836KB

Download
memory/2944-52-0x0000000005A50000-0x0000000005B21000-memory.dmp

Filesize
836KB

Download
memory/2944-50-0x0000000005A50000-0x0000000005B21000-memory.dmp

Filesize
836KB

Download
memory/2944-48-0x0000000005A50000-0x0000000005B21000-memory.dmp

Filesize
836KB

Download
memory/2944-46-0x0000000005A50000-0x0000000005B21000-memory.dmp

Filesize
836KB

Download
memory/2944-44-0x0000000005A50000-0x0000000005B21000-memory.dmp

Filesize
836KB

Download
memory/2944-42-0x0000000005A50000-0x0000000005B21000-memory.dmp

Filesize
836KB

Download
memory/2944-40-0x0000000005A50000-0x0000000005B21000-memory.dmp

Filesize
836KB

Download
memory/2944-38-0x0000000005A50000-0x0000000005B21000-memory.dmp

Filesize
836KB

Download
memory/2944-36-0x0000000005A50000-0x0000000005B21000-memory.dmp

Filesize
836KB

Download
memory/2944-34-0x0000000005A50000-0x0000000005B21000-memory.dmp

Filesize
836KB

Download
memory/2944-30-0x0000000005A50000-0x0000000005B21000-memory.dmp

Filesize
836KB

Download
memory/2944-28-0x0000000005A50000-0x0000000005B21000-memory.dmp

Filesize
836KB

Download
memory/2944-26-0x0000000005A50000-0x0000000005B21000-memory.dmp

Filesize
836KB

Download
memory/2944-24-0x0000000005A50000-0x0000000005B21000-memory.dmp

Filesize
836KB

Download
memory/2944-22-0x0000000005A50000-0x0000000005B21000-memory.dmp

Filesize
836KB

Download
memory/2944-20-0x0000000005A50000-0x0000000005B21000-memory.dmp

Filesize
836KB

Download
memory/2944-14-0x0000000005A50000-0x0000000005B21000-memory.dmp

Filesize
836KB

Download
memory/2944-13-0x0000000005A50000-0x0000000005B21000-memory.dmp

Filesize
836KB

Download
memory/2944-10-0x0000000005A50000-0x0000000005B21000-memory.dmp

Filesize
836KB

Download
memory/2944-8-0x0000000005A50000-0x0000000005B21000-memory.dmp

Filesize
836KB

Download
memory/2944-6-0x0000000005A50000-0x0000000005B21000-memory.dmp

Filesize
836KB

Download
memory/2944-55-0x0000000005A50000-0x0000000005B21000-memory.dmp

Filesize
836KB

Download
memory/2944-32-0x0000000005A50000-0x0000000005B21000-memory.dmp

Filesize
836KB

Download
memory/2944-4-0x0000000005A50000-0x0000000005B21000-memory.dmp

Filesize
836KB

Download
memory/2944-3-0x0000000005A50000-0x0000000005B21000-memory.dmp

Filesize
836KB

Download
memory/2944-1039-0x00000000749A0000-0x0000000075150000-memory.dmp

Filesize
7.7MB

Download
memory/2944-1040-0x00000000749A0000-0x0000000075150000-memory.dmp

Filesize
7.7MB

Download
memory/2944-1041-0x0000000005C00000-0x0000000005C58000-memory.dmp

Filesize
352KB

Download
memory/2944-1042-0x0000000005C60000-0x0000000005CAC000-memory.dmp

Filesize
304KB

Download
memory/2944-1043-0x00000000749AE000-0x00000000749AF000-memory.dmp

Filesize
4KB

Download
memory/2944-1044-0x00000000749A0000-0x0000000075150000-memory.dmp

Filesize
7.7MB

Download
memory/2944-1045-0x00000000065D0000-0x0000000006B74000-memory.dmp

Filesize
5.6MB

Download
memory/2944-1046-0x00000000059C0000-0x0000000005A14000-memory.dmp

Filesize
336KB

Download
memory/2944-1054-0x00000000749A0000-0x0000000075150000-memory.dmp

Filesize
7.7MB

Download
memory/3508-1053-0x0000000000400000-0x0000000000407000-memory.dmp

Filesize
28KB

Download
memory/5396-1059-0x00000000749AE000-0x00000000749AF000-memory.dmp

Filesize
4KB

Download
memory/5396-2096-0x00000000749A0000-0x0000000075150000-memory.dmp

Filesize
7.7MB

Download
memory/5396-2097-0x00000000749A0000-0x0000000075150000-memory.dmp

Filesize
7.7MB

Download
memory/5396-2098-0x00000000749A0000-0x0000000075150000-memory.dmp

Filesize
7.7MB

Download
memory/5396-2106-0x00000000749A0000-0x0000000075150000-memory.dmp

Filesize
7.7MB

Download
memory/5592-2107-0x0000000000400000-0x0000000000407000-memory.dmp

Filesize
28KB

Download