systembc | fdc98ea3381d04350e38b592c2c63090d6f0bd32388a21fcfc5b7bfcb9753d20

Resubmissions

18-04-2024 05:25

240418-f4hreadf5z 10

18-04-2024 05:25

18-04-2024 05:25

18-04-2024 05:25

18-04-2024 05:25

Analysis

max time kernel
1797s
max time network
1801s
platform
windows7_x64
resource
win7-20240221-en
resource tags

arch:x64arch:x86image:win7-20240221-enlocale:en-usos:windows7-x64system
submitted
18-04-2024 05:25

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General

Target

fdc98ea3381d04350e38b592c2c63090d6f0bd32388a21fcfc5b7bfcb9753d20.exe
Size

121KB
MD5

2140899e877c2bb95f71f77c31e205ce
SHA1

b7322db66f0c4b5a48c10ca3213b899131045d11
SHA256

fdc98ea3381d04350e38b592c2c63090d6f0bd32388a21fcfc5b7bfcb9753d20
SHA512

6856af4f8cb1fceede24360c7e081e6beea701a44b80e6276db719e5cba3b6cf5f7fae8df4ce56852ea34e73dfa4e091a8ac258d1efb596e0d7224b33402fe07
SSDEEP

1536:R7YvZGrzMeJILNJMuxyBye/DB79CTi+Ey7c3Ul4kfQuk2RGiXqp64:KvZ8NSLP60e/FeRhTfXrRGN64

Score

10^/10

systembc discovery trojan

Malware Config

Extracted

Family

systembc

sdadvert197.com:4044

mexstat128.com:4044

Signatures

SystemBC
SystemBC is a proxy and remote administration tool first seen in 2019.
trojan systembc
Contacts a large (637) amount of remote hosts 1 TTPs
This may indicate a network scan to discover remotely running services.
discovery

Network Service Discovery
T1046

Executes dropped EXE 1 IoCs

pid	Process
944	axwcgk.exe

Unexpected DNS network traffic destination 1 IoCs

Network traffic to other servers than the configured DNS servers was detected on the DNS port.

description	ioc
Destination IP	88.216.223.3

Looks up external IP address via web service 4 IoCs

Uses a legitimate IP lookup service to find the infected system's external IP.

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

Uses Tor communications 1 TTPs
Malware can proxy its traffic through Tor for more anonymity.

Proxy
T1090

Drops file in Windows directory 2 IoCs

description	ioc	Process
File created	C:\Windows\Tasks\axwcgk.job	fdc98ea3381d04350e38b592c2c63090d6f0bd32388a21fcfc5b7bfcb9753d20.exe
File opened for modification	C:\Windows\Tasks\axwcgk.job	fdc98ea3381d04350e38b592c2c63090d6f0bd32388a21fcfc5b7bfcb9753d20.exe

Suspicious behavior: EnumeratesProcesses 1 IoCs

pid	Process
1592	fdc98ea3381d04350e38b592c2c63090d6f0bd32388a21fcfc5b7bfcb9753d20.exe

Suspicious use of WriteProcessMemory 4 IoCs

description	pid	Process	procid_target
PID 960 wrote to memory of 944	960	taskeng.exe	29
PID 960 wrote to memory of 944	960	taskeng.exe	29
PID 960 wrote to memory of 944	960	taskeng.exe	29
PID 960 wrote to memory of 944	960	taskeng.exe	29

C:\Users\Admin\AppData\Local\Temp\fdc98ea3381d04350e38b592c2c63090d6f0bd32388a21fcfc5b7bfcb9753d20.exe
"C:\Users\Admin\AppData\Local\Temp\fdc98ea3381d04350e38b592c2c63090d6f0bd32388a21fcfc5b7bfcb9753d20.exe"
1⤵
- Drops file in Windows directory
- Suspicious behavior: EnumeratesProcesses
PID:1592

C:\Windows\system32\taskeng.exe
taskeng.exe {EC6C8A70-DECD-4599-9800-7AA2B403710C} S-1-5-18:NT AUTHORITY\System:Service:
1⤵
- Suspicious use of WriteProcessMemory
PID:960
- C:\ProgramData\twjlxk\axwcgk.exe
  C:\ProgramData\twjlxk\axwcgk.exe start
  2⤵
  - Executes dropped EXE
  PID:944

Network

MITRE ATT&CK Enterprise v15

Reconnaissance

Resource Development

Initial Access

Execution

Persistence

Privilege Escalation

Defense Evasion

Credential Access

Discovery

Network Service Discovery

T1046

Lateral Movement

Collection

Command and Control

Proxy

T1090

Exfiltration

Impact

Replay Monitor

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Downloads

C:\ProgramData\twjlxk\axwcgk.exe

Filesize
121KB

MD5
2140899e877c2bb95f71f77c31e205ce

SHA1
b7322db66f0c4b5a48c10ca3213b899131045d11

SHA256
fdc98ea3381d04350e38b592c2c63090d6f0bd32388a21fcfc5b7bfcb9753d20

SHA512
6856af4f8cb1fceede24360c7e081e6beea701a44b80e6276db719e5cba3b6cf5f7fae8df4ce56852ea34e73dfa4e091a8ac258d1efb596e0d7224b33402fe07

Download Submit
memory/944-12-0x0000000000220000-0x0000000000229000-memory.dmp

Filesize
36KB

Download
memory/944-11-0x0000000003300000-0x0000000003400000-memory.dmp

Filesize
1024KB

Download
memory/944-13-0x0000000000400000-0x00000000031D1000-memory.dmp

Filesize
45.8MB

Download
memory/944-19-0x0000000003300000-0x0000000003400000-memory.dmp

Filesize
1024KB

Download
memory/1592-1-0x00000000032E0000-0x00000000033E0000-memory.dmp

Filesize
1024KB

Download
memory/1592-2-0x0000000000220000-0x0000000000229000-memory.dmp

Filesize
36KB

Download
memory/1592-3-0x0000000000400000-0x00000000031D1000-memory.dmp

Filesize
45.8MB

Download
memory/1592-15-0x00000000032E0000-0x00000000033E0000-memory.dmp

Filesize
1024KB

Download