systembc | b403730c8a4eb00c33d4cd564835b15d765f8978b30d6578b2350e5a7dedb2b9

General

Target

b403730c8a4eb00c33d4cd564835b15d765f8978b30d6578b2350e5a7dedb2b9.exe
Size

375KB
MD5

8ceb7cb380ad45d1264ffb75ad6363e1
SHA1

18311e80325eb3bce7f7d8197d5320c360fe42fd
SHA256

b403730c8a4eb00c33d4cd564835b15d765f8978b30d6578b2350e5a7dedb2b9
SHA512

f328de68f70d265f73a044a620dc549b2c02481c10d0a377e0cb8fd890e6fe5fb5fbd77ea45075ab2476407580beeac66b13c1a77cb0e0947b65574dec7be960

Score

10^/10

systembc trojan

Malware Config

Extracted

Family

systembc

C2

26asdcgd.com:4039

26asdcgd.xyz:4039

Signatures

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

Processes:

axlk.exe

pid process

744 axlk.exe
Looks up external IP address via web service 4 IoCs
Uses a legitimate IP lookup service to find the infected system's external IP.

Processes:

flow ioc

7 ip4.seeip.org
8 ip4.seeip.org
5 api.ipify.org
6 api.ipify.org
Uses Tor communications 1 TTPs
Malware can proxy its traffic through Tor for more anonymity.

Connection Proxy
T1090

pid	process
744	axlk.exe

flow	ioc
7	ip4.seeip.org
8	ip4.seeip.org
5	api.ipify.org
6	api.ipify.org

Drops file in Windows directory 2 IoCs

Processes:

b403730c8a4eb00c33d4cd564835b15d765f8978b30d6578b2350e5a7dedb2b9.exe

description	ioc	process
File created	C:\Windows\Tasks\axlk.job	b403730c8a4eb00c33d4cd564835b15d765f8978b30d6578b2350e5a7dedb2b9.exe
File opened for modification	C:\Windows\Tasks\axlk.job	b403730c8a4eb00c33d4cd564835b15d765f8978b30d6578b2350e5a7dedb2b9.exe

Suspicious behavior: EnumeratesProcesses 1 IoCs

Processes:

b403730c8a4eb00c33d4cd564835b15d765f8978b30d6578b2350e5a7dedb2b9.exe

pid process

600 b403730c8a4eb00c33d4cd564835b15d765f8978b30d6578b2350e5a7dedb2b9.exe

pid	process
600	b403730c8a4eb00c33d4cd564835b15d765f8978b30d6578b2350e5a7dedb2b9.exe

Suspicious use of WriteProcessMemory 4 IoCs

Processes:

taskeng.exe

description	pid	process	target process
PID 1140 wrote to memory of 744	1140	taskeng.exe	axlk.exe
PID 1140 wrote to memory of 744	1140	taskeng.exe	axlk.exe
PID 1140 wrote to memory of 744	1140	taskeng.exe	axlk.exe
PID 1140 wrote to memory of 744	1140	taskeng.exe	axlk.exe

C:\Users\Admin\AppData\Local\Temp\b403730c8a4eb00c33d4cd564835b15d765f8978b30d6578b2350e5a7dedb2b9.exe
"C:\Users\Admin\AppData\Local\Temp\b403730c8a4eb00c33d4cd564835b15d765f8978b30d6578b2350e5a7dedb2b9.exe"
1⤵
- Drops file in Windows directory
- Suspicious behavior: EnumeratesProcesses
PID:600

C:\Windows\system32\taskeng.exe
taskeng.exe {F0A2A388-A7FA-4F37-AE8E-6D88ED30B23D} S-1-5-18:NT AUTHORITY\System:Service:
1⤵
- Suspicious use of WriteProcessMemory
PID:1140

C:\ProgramData\tcwebq\axlk.exe
C:\ProgramData\tcwebq\axlk.exe start
2⤵
- Executes dropped EXE
PID:744

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

Loading Replay Monitor...

Downloads

C:\ProgramData\tcwebq\axlk.exe
Filesize
375KB

MD5
8ceb7cb380ad45d1264ffb75ad6363e1

SHA1
18311e80325eb3bce7f7d8197d5320c360fe42fd

SHA256
b403730c8a4eb00c33d4cd564835b15d765f8978b30d6578b2350e5a7dedb2b9

SHA512
f328de68f70d265f73a044a620dc549b2c02481c10d0a377e0cb8fd890e6fe5fb5fbd77ea45075ab2476407580beeac66b13c1a77cb0e0947b65574dec7be960

Download Submit
C:\ProgramData\tcwebq\axlk.exe
Filesize
375KB

MD5
8ceb7cb380ad45d1264ffb75ad6363e1

SHA1
18311e80325eb3bce7f7d8197d5320c360fe42fd

SHA256
b403730c8a4eb00c33d4cd564835b15d765f8978b30d6578b2350e5a7dedb2b9

SHA512
f328de68f70d265f73a044a620dc549b2c02481c10d0a377e0cb8fd890e6fe5fb5fbd77ea45075ab2476407580beeac66b13c1a77cb0e0947b65574dec7be960

Download Submit
memory/600-54-0x0000000075871000-0x0000000075873000-memory.dmp

Filesize
8KB

Download
memory/600-56-0x0000000000220000-0x0000000000229000-memory.dmp

Filesize
36KB

Download
memory/600-55-0x00000000024E7000-0x00000000024EE000-memory.dmp

Filesize
28KB

Download
memory/600-57-0x0000000000400000-0x000000000231A000-memory.dmp

Filesize
31.1MB

Download
memory/744-59-0x0000000000000000-mapping.dmp

Download
memory/744-62-0x0000000002437000-0x000000000243D000-memory.dmp

Filesize
24KB

Download
memory/744-63-0x0000000000400000-0x000000000231A000-memory.dmp

Filesize
31.1MB

Download

Analysis

Sharing