systembc | 2fee15f797ca4443cbfda12073902ce0bd5e8e270a2e779fb481a6d2ba382809

Resubmissions

09-08-2024 18:59

240809-xnehgsvanl 10

09-08-2024 18:13

240809-wt8g3stdrp 10

Analysis

max time kernel
141s
max time network
119s
platform
windows7_x64
resource
win7-20240704-en
resource tags

arch:x64arch:x86image:win7-20240704-enlocale:en-usos:windows7-x64system
submitted
09-08-2024 18:59

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General

Target

autoupdate.dll
Size

3.0MB
MD5

729527a4e620ce6650b35858f43f4f44
SHA1

d01df5fd3edad753fdbbd3a15406f7b9e28e910e
SHA256

b57795017364deb0f319fa62c440500882562f6650e651b49058e080cbe8f9a8
SHA512

c81ba619a3a74d2fa893b980ac11d2a49d8be2c42617f2cf0a65c04f26e1ae2a088bc2ce40d7c7171adace6e5d92d8eccac04fb6fafea6d9224fe79e1a70a108
SSDEEP

49152:ciz0lsT/VMGu3M1AOhVZ1zY0tRJujI340tIsN69EdjXMPr4EClomXSK754zuBLZs:cqzuxk22fvXMTkoP9

Score

10^/10

systembc trojan

Malware Config

Extracted

Family

systembc

66.85.173.12:443

23.131.216.131:443

Signatures

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

Blocklisted process makes network request 1 IoCs

flow	pid	Process
3	2056	rundll32.exe

Enumerates physical storage devices 1 TTPs
Attempts to interact with connected storage/optical drive(s).

System Information Discovery
T1082

Modifies registry class 12 IoCs

description	ioc	Process
Key created	\REGISTRY\USER\S-1-5-21-3434294380-2554721341-1919518612-1000_Classes\Local Settings	rundll32.exe
Set value (str)	\REGISTRY\USER\S-1-5-21-3434294380-2554721341-1919518612-1000_CLASSES\.DAT\ = "DAT_auto_file"	rundll32.exe
Key created	\REGISTRY\USER\S-1-5-21-3434294380-2554721341-1919518612-1000_CLASSES\DAT_auto_file\shell	rundll32.exe
Key created	\REGISTRY\USER\S-1-5-21-3434294380-2554721341-1919518612-1000_CLASSES\DAT_auto_file\shell\edit\command	rundll32.exe
Set value (str)	\REGISTRY\USER\S-1-5-21-3434294380-2554721341-1919518612-1000_CLASSES\DAT_auto_file\shell\edit\command\ = "%SystemRoot%\\system32\\NOTEPAD.EXE %1"	rundll32.exe
Key created	\REGISTRY\USER\S-1-5-21-3434294380-2554721341-1919518612-1000_CLASSES\DAT_auto_file	rundll32.exe
Set value (str)	\REGISTRY\USER\S-1-5-21-3434294380-2554721341-1919518612-1000_CLASSES\DAT_auto_file\	rundll32.exe
Key created	\REGISTRY\USER\S-1-5-21-3434294380-2554721341-1919518612-1000_CLASSES\.DAT	rundll32.exe
Key created	\REGISTRY\USER\S-1-5-21-3434294380-2554721341-1919518612-1000_CLASSES\DAT_auto_file\shell\edit	rundll32.exe
Key created	\REGISTRY\USER\S-1-5-21-3434294380-2554721341-1919518612-1000_CLASSES\DAT_auto_file\shell\open	rundll32.exe
Key created	\REGISTRY\USER\S-1-5-21-3434294380-2554721341-1919518612-1000_CLASSES\DAT_auto_file\shell\open\command	rundll32.exe
Set value (str)	\REGISTRY\USER\S-1-5-21-3434294380-2554721341-1919518612-1000_CLASSES\DAT_auto_file\shell\open\command\ = "%SystemRoot%\\system32\\NOTEPAD.EXE %1"	rundll32.exe

Opens file in notepad (likely ransom note) 2 IoCs

ransomware

pid	Process
2324	NOTEPAD.EXE
3024	NOTEPAD.EXE

Suspicious use of WriteProcessMemory 3 IoCs

description	pid	Process	procid_target
PID 2900 wrote to memory of 2324	2900	rundll32.exe	36
PID 2900 wrote to memory of 2324	2900	rundll32.exe	36
PID 2900 wrote to memory of 2324	2900	rundll32.exe	36

C:\Windows\system32\rundll32.exe
rundll32.exe C:\Users\Admin\AppData\Local\Temp\autoupdate.dll,#1
1⤵
- Blocklisted process makes network request
PID:2056

C:\Windows\explorer.exe
"C:\Windows\explorer.exe"
1⤵
PID:2800

C:\Windows\system32\rundll32.exe
"C:\Windows\system32\rundll32.exe" C:\Windows\system32\shell32.dll,OpenAs_RunDLL C:\Users\Admin\AppData\Local\Temp\SA.DAT
1⤵
- Modifies registry class
- Suspicious use of WriteProcessMemory
PID:2900
- C:\Windows\system32\NOTEPAD.EXE
  "C:\Windows\system32\NOTEPAD.EXE" C:\Users\Admin\AppData\Local\Temp\SA.DAT
  2⤵
  - Opens file in notepad (likely ransom note)
  PID:2324

C:\Windows\system32\NOTEPAD.EXE
"C:\Windows\system32\NOTEPAD.EXE" C:\Users\Admin\AppData\Local\Temp\4094122010\payload.dat
1⤵
- Opens file in notepad (likely ransom note)
PID:3024

Network

MITRE ATT&CK Enterprise v15

Reconnaissance

Resource Development

Initial Access

Execution

Persistence

Privilege Escalation

Defense Evasion

Credential Access

Discovery

System Information Discovery

T1082

Lateral Movement

Collection

Command and Control

Exfiltration

Impact

Replay Monitor

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Downloads

memory/2056-0-0x000007FEF6150000-0x000007FEF645B000-memory.dmp

Filesize
3.0MB

Download
memory/2056-1-0x000007FEF6150000-0x000007FEF62EB000-memory.dmp

Filesize
1.6MB

Download
memory/2056-2-0x000007FEF6150000-0x000007FEF645B000-memory.dmp

Filesize
3.0MB

Download