systembc | b87961b51b3b2958a9b2a0dd6e0f56edb0efb52fdcc68aa553097c2ea5f52e4e

General

Target

b87961b51b3b2958a9b2a0dd6e0f56edb0efb52fdcc68aa553097c2ea5f52e4e.exe
Size

285KB
MD5

44104370647086089833d115c55f6d7f
SHA1

502c3678a36c7433bc402f787cc0f0c7cc7eec29
SHA256

b87961b51b3b2958a9b2a0dd6e0f56edb0efb52fdcc68aa553097c2ea5f52e4e
SHA512

a91ca5aa9dfa02f35ef2344b3485e28ab55f41fc4d0f38a9d176b959e10cbfdba8a79b304d67ec3e1478ed9270e3e79855bd352a932e3845e8141ac471b2b29e

Score

10^/10

systembc trojan

Malware Config

Extracted

Family

systembc

C2

advertrex20.xyz:4044

gentexman37.xyz:4044

Signatures

SystemBC
SystemBC is a proxy and remote administration tool first seen in 2019.
trojan systembc
Executes dropped EXE 1 IoCs

Processes:

limaxgj.exe

pid process

3836 limaxgj.exe
Looks up external IP address via web service 2 IoCs
Uses a legitimate IP lookup service to find the infected system's external IP.

Processes:

flow ioc

34 api.ipify.org
35 api.ipify.org
Uses Tor communications 1 TTPs
Malware can proxy its traffic through Tor for more anonymity.

Connection Proxy
T1090

pid	process
3836	limaxgj.exe

flow	ioc
34	api.ipify.org
35	api.ipify.org

Drops file in Windows directory 2 IoCs

Processes:

b87961b51b3b2958a9b2a0dd6e0f56edb0efb52fdcc68aa553097c2ea5f52e4e.exe

description	ioc	process
File created	C:\Windows\Tasks\limaxgj.job	b87961b51b3b2958a9b2a0dd6e0f56edb0efb52fdcc68aa553097c2ea5f52e4e.exe
File opened for modification	C:\Windows\Tasks\limaxgj.job	b87961b51b3b2958a9b2a0dd6e0f56edb0efb52fdcc68aa553097c2ea5f52e4e.exe

Program crash 1 IoCs

Processes:

WerFault.exe

pid pid_target process target process

1792 3764 WerFault.exe b87961b51b3b2958a9b2a0dd6e0f56edb0efb52fdcc68aa553097c2ea5f52e4e.exe

pid	pid_target	process	target process
1792	3764	WerFault.exe	b87961b51b3b2958a9b2a0dd6e0f56edb0efb52fdcc68aa553097c2ea5f52e4e.exe

Suspicious behavior: EnumeratesProcesses 2 IoCs

Processes:

b87961b51b3b2958a9b2a0dd6e0f56edb0efb52fdcc68aa553097c2ea5f52e4e.exe

pid	process
3764	b87961b51b3b2958a9b2a0dd6e0f56edb0efb52fdcc68aa553097c2ea5f52e4e.exe
3764	b87961b51b3b2958a9b2a0dd6e0f56edb0efb52fdcc68aa553097c2ea5f52e4e.exe

C:\Users\Admin\AppData\Local\Temp\b87961b51b3b2958a9b2a0dd6e0f56edb0efb52fdcc68aa553097c2ea5f52e4e.exe
"C:\Users\Admin\AppData\Local\Temp\b87961b51b3b2958a9b2a0dd6e0f56edb0efb52fdcc68aa553097c2ea5f52e4e.exe"
1⤵
- Drops file in Windows directory
- Suspicious behavior: EnumeratesProcesses
PID:3764
- C:\Windows\SysWOW64\WerFault.exe
  C:\Windows\SysWOW64\WerFault.exe -u -p 3764 -s 484
  2⤵
  - Program crash
  PID:1792

C:\ProgramData\cauvd\limaxgj.exe
C:\ProgramData\cauvd\limaxgj.exe start
1⤵
- Executes dropped EXE
PID:3836

C:\Windows\SysWOW64\WerFault.exe
C:\Windows\SysWOW64\WerFault.exe -pss -s 440 -p 3764 -ip 3764
1⤵
PID:2516

Network

MITRE ATT&CK Enterprise v6

Initial Access

Execution

Persistence

Privilege Escalation

Defense Evasion

Connection Proxy

1

T1090

Credential Access

Discovery

Lateral Movement

Collection

Command and Control

Connection Proxy

1

T1090

Exfiltration

Impact

Replay Monitor

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Downloads

C:\ProgramData\cauvd\limaxgj.exe

MD5
44104370647086089833d115c55f6d7f

SHA1
502c3678a36c7433bc402f787cc0f0c7cc7eec29

SHA256
b87961b51b3b2958a9b2a0dd6e0f56edb0efb52fdcc68aa553097c2ea5f52e4e

SHA512
a91ca5aa9dfa02f35ef2344b3485e28ab55f41fc4d0f38a9d176b959e10cbfdba8a79b304d67ec3e1478ed9270e3e79855bd352a932e3845e8141ac471b2b29e

Download Submit
C:\ProgramData\cauvd\limaxgj.exe

MD5
44104370647086089833d115c55f6d7f

SHA1
502c3678a36c7433bc402f787cc0f0c7cc7eec29

SHA256
b87961b51b3b2958a9b2a0dd6e0f56edb0efb52fdcc68aa553097c2ea5f52e4e

SHA512
a91ca5aa9dfa02f35ef2344b3485e28ab55f41fc4d0f38a9d176b959e10cbfdba8a79b304d67ec3e1478ed9270e3e79855bd352a932e3845e8141ac471b2b29e

Download Submit
memory/3764-130-0x0000000004790000-0x0000000004796000-memory.dmp

Filesize
24KB

Download
memory/3764-131-0x00000000047A0000-0x00000000047A9000-memory.dmp

Filesize
36KB

Download
memory/3764-132-0x0000000000400000-0x00000000046C7000-memory.dmp

Filesize
66.8MB

Download
memory/3836-135-0x0000000004830000-0x0000000004839000-memory.dmp

Filesize
36KB

Download
memory/3836-136-0x0000000000400000-0x00000000046C7000-memory.dmp

Filesize
66.8MB

Download

Analysis

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