systembc | aaf1787a98de070ce8b558155b7f9a36e779bc21552f8ae6b39fdab275d9f7c0 | Triage

Resubmissions

03-03-2021 20:39

210303-l815xsjb2x 10

Analysis

max time kernel
12s
max time network
11s
platform
windows7_x64
resource
win7v20201028
submitted
03-03-2021 20:39

Sharing

Report Analysis Logs

General

Target

index.xls.dll
Size

90KB
MD5

f64b4989e48381bc2aa0ffba6463db7b
SHA1

48baefe376fd4181f786078e8aa1599c1ae9c899
SHA256

aaf1787a98de070ce8b558155b7f9a36e779bc21552f8ae6b39fdab275d9f7c0
SHA512

b45b7c0a3975896e41755515b09e39ac7179be78cefcf8111e7eca8235b03a5872375f954b75ed79794815d611daf19b2e3457c45353554ca8d9e335895a6b23

Score

10^/10

systembc trojan

Malware Config

Extracted

Family

systembc

C2

marchassl01.com:4001

marchassl012.com:4001

Signatures

SystemBC
SystemBC is a proxy and remote administration tool first seen in 2019.
trojan systembc
Blocklisted process makes network request 1 IoCs

Processes:

rundll32.exe

flow pid process

3 1424 rundll32.exe

Suspicious use of WriteProcessMemory 7 IoCs

Processes:

rundll32.exe

description	pid	process	target process
PID 1900 wrote to memory of 1424	1900	rundll32.exe	rundll32.exe
PID 1900 wrote to memory of 1424	1900	rundll32.exe	rundll32.exe
PID 1900 wrote to memory of 1424	1900	rundll32.exe	rundll32.exe
PID 1900 wrote to memory of 1424	1900	rundll32.exe	rundll32.exe
PID 1900 wrote to memory of 1424	1900	rundll32.exe	rundll32.exe
PID 1900 wrote to memory of 1424	1900	rundll32.exe	rundll32.exe
PID 1900 wrote to memory of 1424	1900	rundll32.exe	rundll32.exe

C:\Windows\system32\rundll32.exe
rundll32.exe C:\Users\Admin\AppData\Local\Temp\index.xls.dll,#1
1⤵
- Suspicious use of WriteProcessMemory
PID:1900
- C:\Windows\SysWOW64\rundll32.exe
  rundll32.exe C:\Users\Admin\AppData\Local\Temp\index.xls.dll,#1
  2⤵
  - Blocklisted process makes network request
  PID:1424

Network

MITRE ATT&CK Matrix

Replay Monitor

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Downloads

memory/1424-2-0x0000000000000000-mapping.dmp

Download
memory/1424-3-0x0000000076271000-0x0000000076273000-memory.dmp

Filesize
8KB

Download
memory/1424-4-0x0000000000340000-0x0000000000359000-memory.dmp

Filesize
100KB

Download
memory/1424-5-0x0000000010000000-0x0000000010019000-memory.dmp

Filesize
100KB

Download