systembc | 42a191ee4f9593db8f514cce85ad8b9d6533bc71983a9529e7a5d68764d21679

Resubmissions

15/04/2024, 11:31

240415-nmzycsff4y10

10/04/2024, 04:57

10/04/2024, 04:57

10/04/2024, 04:57

10/04/2024, 04:57

19/12/2023, 13:06

Analysis

max time kernel
600s
max time network
603s
platform
windows7_x64
resource
win7-20240221-en
resource tags

arch:x64arch:x86image:win7-20240221-enlocale:en-usos:windows7-x64system
submitted
10/04/2024, 04:57

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General

Target
2d3ba7dd14b9a579b2626fa5baee19bd.exe
Size 209KB
Sample240410-flbkdadc77
SHA256 42a191ee4f9593db8f514cce85ad8b9d6533bc71983a9529e7a5d68764d21679
MD5 2d3ba7dd14b9a579b2626fa5baee19bd
SHA1 dd365103583cfb3c10b73efc6592f8b80c1d75e0
SHA512 29efd1035df73572efea0d96017772481b9858855c12d1bb96fc6a4ccd49443a4bb0d1bd86c69dda4218f04e8855ec37c4515157b75a240a530792232c4f03c0
SSDEEP 6144:YDnLgI91y1UkT57iJz/DpURWPSvHuUiYphu1UY:cnLh9yn52rpUR5vHuRYpM+Y
MD5 SHA1 SHA512 SSDEEP

Score

10^/10

systembc trojan upx

Malware Config

Extracted

Family

systembc

yan0212.com:4039
yan0212.net:4039

Signatures

SystemBC
SystemBC is a proxy and remote administration tool first seen in 2019.
trojan systembc

Executes dropped EXE 1 IoCs

pid	Process
2624	dfrwhg.exe

UPX packed file 1 IoCs

Detects executables packed with UPX/modified UPX open source packer.

upx

resource	yara_rule
behavioral1/files/0x000c000000012266-6.dat	upx

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	88.216.223.5

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
5	api.ipify.org
6	api.ipify.org
7	ip4.seeip.org
8	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\dfrwhg.job	2d3ba7dd14b9a579b2626fa5baee19bd.exe
File opened for modification	C:\Windows\Tasks\dfrwhg.job	2d3ba7dd14b9a579b2626fa5baee19bd.exe

Suspicious behavior: EnumeratesProcesses 1 IoCs

pid	Process
2228	2d3ba7dd14b9a579b2626fa5baee19bd.exe

Suspicious use of WriteProcessMemory 4 IoCs

description	pid	Process	procid_target
PID 2516 wrote to memory of 2624	2516	taskeng.exe	29
PID 2516 wrote to memory of 2624	2516	taskeng.exe	29
PID 2516 wrote to memory of 2624	2516	taskeng.exe	29
PID 2516 wrote to memory of 2624	2516	taskeng.exe	29

C:\Users\Admin\AppData\Local\Temp\2d3ba7dd14b9a579b2626fa5baee19bd.exe
"C:\Users\Admin\AppData\Local\Temp\2d3ba7dd14b9a579b2626fa5baee19bd.exe"
1⤵
- Drops file in Windows directory
- Suspicious behavior: EnumeratesProcesses
PID:2228

C:\Windows\system32\taskeng.exe
taskeng.exe {6120E1B9-2E10-4831-82E1-7B4FBA4E6ADA} S-1-5-18:NT AUTHORITY\System:Service:
1⤵
- Suspicious use of WriteProcessMemory
PID:2516
- C:\ProgramData\arcbjv\dfrwhg.exe
  C:\ProgramData\arcbjv\dfrwhg.exe start
  2⤵
  - Executes dropped EXE
  PID:2624

Network

MITRE ATT&CK Enterprise v15

Reconnaissance

Resource Development

Initial Access

Execution

Persistence

Privilege Escalation

Defense Evasion

Credential Access

Discovery

Lateral Movement

Collection

Command and Control

Proxy

T1090

Exfiltration

Impact

Replay Monitor

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Downloads

dfrwhg.exe

Path C:\ProgramData\arcbjv\dfrwhg.exe
Size 209KB
SHA256 42a191ee4f9593db8f514cce85ad8b9d6533bc71983a9529e7a5d68764d21679
MD5 2d3ba7dd14b9a579b2626fa5baee19bd
SHA1 dd365103583cfb3c10b73efc6592f8b80c1d75e0
SHA512 29efd1035df73572efea0d96017772481b9858855c12d1bb96fc6a4ccd49443a4bb0d1bd86c69dda4218f04e8855ec37c4515157b75a240a530792232c4f03c0
SSDEEP 6144:YDnLgI91y1UkT57iJz/DpURWPSvHuUiYphu1UY:cnLh9yn52rpUR5vHuRYpM+Y
MD5 SHA1 SHA512 SSDEEP

Submit Download

memory/2228-1-0x0000000004750000-0x0000000004850000-memory.dmp

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memory/2228-2-0x0000000000020000-0x0000000000029000-memory.dmp

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memory/2228-9-0x0000000000400000-0x00000000045F0000-memory.dmp

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memory/2228-13-0x0000000004750000-0x0000000004850000-memory.dmp

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memory/2624-10-0x00000000046E0000-0x00000000047E0000-memory.dmp

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memory/2624-12-0x0000000000400000-0x00000000045F0000-memory.dmp

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memory/2624-16-0x00000000046E0000-0x00000000047E0000-memory.dmp

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