Malware Analysis Report

2024-11-13 17:16

Sample ID 231219-wldyhabgf5
Target 70bdc622d4ecb4da6eb1d3a5f98652ab
SHA256 f82516c78483b315b21307bcbecd66273dfa1963f3ffa9d2609df6341e00a95e
Tags
systembc trojan
score
10/10

Table of Contents

Analysis Overview

MITRE ATT&CK

Enterprise Matrix V15

Analysis: static1

Detonation Overview

Signatures

Analysis: behavioral1

Detonation Overview

Command Line

Signatures

Processes

Network

Files

Analysis: behavioral2

Detonation Overview

Command Line

Signatures

Processes

Network

Files

Analysis Overview

score
10/10

SHA256

f82516c78483b315b21307bcbecd66273dfa1963f3ffa9d2609df6341e00a95e

Threat Level: Known bad

The file 70bdc622d4ecb4da6eb1d3a5f98652ab was found to be: Known bad.

Malicious Activity Summary

systembc trojan

SystemBC

Executes dropped EXE

Loads dropped DLL

Uses Tor communications

Looks up external IP address via web service

Suspicious use of SetThreadContext

Drops file in System32 directory

Drops file in Windows directory

Program crash

Unsigned PE

Enumerates physical storage devices

NSIS installer

Suspicious use of WriteProcessMemory

Suspicious behavior: EnumeratesProcesses

Suspicious behavior: MapViewOfSection

MITRE ATT&CK

Analysis: static1

Detonation Overview

Reported

2023-12-19 18:00

Signatures

Unsigned PE

Description Indicator Process Target
N/A N/A N/A N/A

NSIS installer

installer
Description Indicator Process Target
N/A N/A N/A N/A
N/A N/A N/A N/A

Analysis: behavioral1

Detonation Overview

Submitted

2023-12-19 18:00

Reported

2023-12-20 00:16

Platform

win7-20231215-en

Max time kernel

169s

Max time network

185s

Command Line

"C:\Users\Admin\AppData\Local\Temp\70bdc622d4ecb4da6eb1d3a5f98652ab.exe"

Signatures

SystemBC

trojan systembc

Executes dropped EXE

Description Indicator Process Target
N/A N/A C:\ProgramData\hrsrvt\csxao.exe N/A
N/A N/A C:\ProgramData\hrsrvt\csxao.exe N/A
N/A N/A C:\ProgramData\hrsrvt\csxao.exe N/A
N/A N/A C:\ProgramData\hrsrvt\csxao.exe N/A

Looks up external IP address via web service

Description Indicator Process Target
N/A ip4.seeip.org N/A N/A
N/A ip4.seeip.org N/A N/A
N/A api.ipify.org N/A N/A
N/A api.ipify.org N/A N/A

Uses Tor communications

Drops file in System32 directory

Description Indicator Process Target
File created C:\Windows\SysWOW64\config\systemprofile\AppData\Roaming\523724207 C:\ProgramData\hrsrvt\csxao.exe N/A
File opened for modification C:\Windows\SysWOW64\config\systemprofile\AppData\Roaming\523724207 C:\ProgramData\hrsrvt\csxao.exe N/A

Suspicious use of SetThreadContext

Description Indicator Process Target
PID 2680 set thread context of 2728 N/A C:\Users\Admin\AppData\Local\Temp\70bdc622d4ecb4da6eb1d3a5f98652ab.exe C:\Users\Admin\AppData\Local\Temp\70bdc622d4ecb4da6eb1d3a5f98652ab.exe
PID 364 set thread context of 1840 N/A C:\ProgramData\hrsrvt\csxao.exe C:\ProgramData\hrsrvt\csxao.exe
PID 876 set thread context of 576 N/A C:\ProgramData\hrsrvt\csxao.exe C:\ProgramData\hrsrvt\csxao.exe

Drops file in Windows directory

Description Indicator Process Target
File opened for modification C:\Windows\Tasks\csxao.job C:\Users\Admin\AppData\Local\Temp\70bdc622d4ecb4da6eb1d3a5f98652ab.exe N/A
File created C:\Windows\Tasks\csxao.job C:\Users\Admin\AppData\Local\Temp\70bdc622d4ecb4da6eb1d3a5f98652ab.exe N/A

Enumerates physical storage devices

NSIS installer

installer
Description Indicator Process Target
N/A N/A N/A N/A
N/A N/A N/A N/A

Suspicious behavior: EnumeratesProcesses

Description Indicator Process Target
N/A N/A C:\Users\Admin\AppData\Local\Temp\70bdc622d4ecb4da6eb1d3a5f98652ab.exe N/A

Suspicious behavior: MapViewOfSection

Description Indicator Process Target
N/A N/A C:\Users\Admin\AppData\Local\Temp\70bdc622d4ecb4da6eb1d3a5f98652ab.exe N/A
N/A N/A C:\ProgramData\hrsrvt\csxao.exe N/A
N/A N/A C:\ProgramData\hrsrvt\csxao.exe N/A

Suspicious use of WriteProcessMemory

Description Indicator Process Target
PID 2680 wrote to memory of 2728 N/A C:\Users\Admin\AppData\Local\Temp\70bdc622d4ecb4da6eb1d3a5f98652ab.exe C:\Users\Admin\AppData\Local\Temp\70bdc622d4ecb4da6eb1d3a5f98652ab.exe
PID 2680 wrote to memory of 2728 N/A C:\Users\Admin\AppData\Local\Temp\70bdc622d4ecb4da6eb1d3a5f98652ab.exe C:\Users\Admin\AppData\Local\Temp\70bdc622d4ecb4da6eb1d3a5f98652ab.exe
PID 2680 wrote to memory of 2728 N/A C:\Users\Admin\AppData\Local\Temp\70bdc622d4ecb4da6eb1d3a5f98652ab.exe C:\Users\Admin\AppData\Local\Temp\70bdc622d4ecb4da6eb1d3a5f98652ab.exe
PID 2680 wrote to memory of 2728 N/A C:\Users\Admin\AppData\Local\Temp\70bdc622d4ecb4da6eb1d3a5f98652ab.exe C:\Users\Admin\AppData\Local\Temp\70bdc622d4ecb4da6eb1d3a5f98652ab.exe
PID 2680 wrote to memory of 2728 N/A C:\Users\Admin\AppData\Local\Temp\70bdc622d4ecb4da6eb1d3a5f98652ab.exe C:\Users\Admin\AppData\Local\Temp\70bdc622d4ecb4da6eb1d3a5f98652ab.exe
PID 2680 wrote to memory of 2728 N/A C:\Users\Admin\AppData\Local\Temp\70bdc622d4ecb4da6eb1d3a5f98652ab.exe C:\Users\Admin\AppData\Local\Temp\70bdc622d4ecb4da6eb1d3a5f98652ab.exe
PID 2680 wrote to memory of 2728 N/A C:\Users\Admin\AppData\Local\Temp\70bdc622d4ecb4da6eb1d3a5f98652ab.exe C:\Users\Admin\AppData\Local\Temp\70bdc622d4ecb4da6eb1d3a5f98652ab.exe
PID 2680 wrote to memory of 2728 N/A C:\Users\Admin\AppData\Local\Temp\70bdc622d4ecb4da6eb1d3a5f98652ab.exe C:\Users\Admin\AppData\Local\Temp\70bdc622d4ecb4da6eb1d3a5f98652ab.exe
PID 1644 wrote to memory of 364 N/A C:\Windows\system32\taskeng.exe C:\ProgramData\hrsrvt\csxao.exe
PID 1644 wrote to memory of 364 N/A C:\Windows\system32\taskeng.exe C:\ProgramData\hrsrvt\csxao.exe
PID 1644 wrote to memory of 364 N/A C:\Windows\system32\taskeng.exe C:\ProgramData\hrsrvt\csxao.exe
PID 1644 wrote to memory of 364 N/A C:\Windows\system32\taskeng.exe C:\ProgramData\hrsrvt\csxao.exe
PID 1644 wrote to memory of 364 N/A C:\Windows\system32\taskeng.exe C:\ProgramData\hrsrvt\csxao.exe
PID 1644 wrote to memory of 364 N/A C:\Windows\system32\taskeng.exe C:\ProgramData\hrsrvt\csxao.exe
PID 1644 wrote to memory of 364 N/A C:\Windows\system32\taskeng.exe C:\ProgramData\hrsrvt\csxao.exe
PID 364 wrote to memory of 1840 N/A C:\ProgramData\hrsrvt\csxao.exe C:\ProgramData\hrsrvt\csxao.exe
PID 364 wrote to memory of 1840 N/A C:\ProgramData\hrsrvt\csxao.exe C:\ProgramData\hrsrvt\csxao.exe
PID 364 wrote to memory of 1840 N/A C:\ProgramData\hrsrvt\csxao.exe C:\ProgramData\hrsrvt\csxao.exe
PID 364 wrote to memory of 1840 N/A C:\ProgramData\hrsrvt\csxao.exe C:\ProgramData\hrsrvt\csxao.exe
PID 364 wrote to memory of 1840 N/A C:\ProgramData\hrsrvt\csxao.exe C:\ProgramData\hrsrvt\csxao.exe
PID 364 wrote to memory of 1840 N/A C:\ProgramData\hrsrvt\csxao.exe C:\ProgramData\hrsrvt\csxao.exe
PID 364 wrote to memory of 1840 N/A C:\ProgramData\hrsrvt\csxao.exe C:\ProgramData\hrsrvt\csxao.exe
PID 364 wrote to memory of 1840 N/A C:\ProgramData\hrsrvt\csxao.exe C:\ProgramData\hrsrvt\csxao.exe
PID 1644 wrote to memory of 876 N/A C:\Windows\system32\taskeng.exe C:\ProgramData\hrsrvt\csxao.exe
PID 1644 wrote to memory of 876 N/A C:\Windows\system32\taskeng.exe C:\ProgramData\hrsrvt\csxao.exe
PID 1644 wrote to memory of 876 N/A C:\Windows\system32\taskeng.exe C:\ProgramData\hrsrvt\csxao.exe
PID 1644 wrote to memory of 876 N/A C:\Windows\system32\taskeng.exe C:\ProgramData\hrsrvt\csxao.exe
PID 1644 wrote to memory of 876 N/A C:\Windows\system32\taskeng.exe C:\ProgramData\hrsrvt\csxao.exe
PID 1644 wrote to memory of 876 N/A C:\Windows\system32\taskeng.exe C:\ProgramData\hrsrvt\csxao.exe
PID 1644 wrote to memory of 876 N/A C:\Windows\system32\taskeng.exe C:\ProgramData\hrsrvt\csxao.exe
PID 876 wrote to memory of 576 N/A C:\ProgramData\hrsrvt\csxao.exe C:\ProgramData\hrsrvt\csxao.exe
PID 876 wrote to memory of 576 N/A C:\ProgramData\hrsrvt\csxao.exe C:\ProgramData\hrsrvt\csxao.exe
PID 876 wrote to memory of 576 N/A C:\ProgramData\hrsrvt\csxao.exe C:\ProgramData\hrsrvt\csxao.exe
PID 876 wrote to memory of 576 N/A C:\ProgramData\hrsrvt\csxao.exe C:\ProgramData\hrsrvt\csxao.exe
PID 876 wrote to memory of 576 N/A C:\ProgramData\hrsrvt\csxao.exe C:\ProgramData\hrsrvt\csxao.exe
PID 876 wrote to memory of 576 N/A C:\ProgramData\hrsrvt\csxao.exe C:\ProgramData\hrsrvt\csxao.exe
PID 876 wrote to memory of 576 N/A C:\ProgramData\hrsrvt\csxao.exe C:\ProgramData\hrsrvt\csxao.exe
PID 876 wrote to memory of 576 N/A C:\ProgramData\hrsrvt\csxao.exe C:\ProgramData\hrsrvt\csxao.exe

Processes

C:\Users\Admin\AppData\Local\Temp\70bdc622d4ecb4da6eb1d3a5f98652ab.exe

"C:\Users\Admin\AppData\Local\Temp\70bdc622d4ecb4da6eb1d3a5f98652ab.exe"

C:\Users\Admin\AppData\Local\Temp\70bdc622d4ecb4da6eb1d3a5f98652ab.exe

"C:\Users\Admin\AppData\Local\Temp\70bdc622d4ecb4da6eb1d3a5f98652ab.exe"

C:\Windows\system32\taskeng.exe

taskeng.exe {789E334C-9763-41FC-8160-C5ABD4A36664} S-1-5-18:NT AUTHORITY\System:Service:

C:\ProgramData\hrsrvt\csxao.exe

C:\ProgramData\hrsrvt\csxao.exe start

C:\ProgramData\hrsrvt\csxao.exe

C:\ProgramData\hrsrvt\csxao.exe start

C:\ProgramData\hrsrvt\csxao.exe

C:\ProgramData\hrsrvt\csxao.exe start

C:\ProgramData\hrsrvt\csxao.exe

C:\ProgramData\hrsrvt\csxao.exe start

Network

Country Destination Domain Proto
GB 80.85.84.79:4001 tcp
GB 80.85.84.79:4001 tcp
US 8.8.8.8:53 api.ipify.org udp
US 64.185.227.156:443 api.ipify.org tcp
US 8.8.8.8:53 ip4.seeip.org udp
US 23.128.64.141:443 ip4.seeip.org tcp
NL 194.109.206.212:80 tcp
SE 171.25.193.9:443 171.25.193.9 tcp
DE 79.250.75.98:443 tcp
DE 85.215.236.196:443 tcp
IN 40.81.240.4:443 tcp
HR 45.95.169.117:27111 tcp
DE 193.23.244.244:80 193.23.244.244 tcp
DE 178.63.19.126:9001 tcp
DE 158.101.163.78:445 tcp
US 147.135.110.109:443 tcp
HK 91.245.255.87:9001 tcp
US 165.227.180.118:9001 tcp
PL 178.19.96.125:27941 tcp
PL 151.115.51.229:443 tcp
PL 45.138.16.147:110 tcp
DE 193.31.27.109:9001 tcp
DE 139.59.148.178:9001 tcp
DE 193.23.244.244:80 193.23.244.244 tcp
MD 5.181.158.12:9054 tcp

Files

\Users\Admin\AppData\Local\Temp\nsoB137.tmp\System.dll

MD5 fccff8cb7a1067e23fd2e2b63971a8e1
SHA1 30e2a9e137c1223a78a0f7b0bf96a1c361976d91
SHA256 6fcea34c8666b06368379c6c402b5321202c11b00889401c743fb96c516c679e
SHA512 f4335e84e6f8d70e462a22f1c93d2998673a7616c868177cac3e8784a3be1d7d0bb96f2583fa0ed82f4f2b6b8f5d9b33521c279a42e055d80a94b4f3f1791e0c

memory/2728-7-0x0000000000400000-0x000000000040B000-memory.dmp

memory/2728-9-0x0000000000400000-0x000000000040B000-memory.dmp

memory/2728-11-0x0000000000400000-0x000000000040B000-memory.dmp

C:\ProgramData\hrsrvt\csxao.exe

MD5 70bdc622d4ecb4da6eb1d3a5f98652ab
SHA1 6be9177289178f1799ca1241a35e94d24089148e
SHA256 f82516c78483b315b21307bcbecd66273dfa1963f3ffa9d2609df6341e00a95e
SHA512 f04a3df175241f72c85c6eb4e447aebb8f8832d09327c9f80a661e318cb265bc7b7a0490575f9c80e3142e493fc95588d7cca4e4c230ce09b93ab535a6e66c39

C:\Windows\SysWOW64\config\systemprofile\AppData\Roaming\523724207

MD5 e2bcf3f4d1bf5cd55b8e2bcdea1bd3c5
SHA1 e80cdb0628b45ccdd2cab2055d740f24116d89c0
SHA256 636ea92e088c0deae15b2d6b60d5220882e6c6a758028686f65a285ee87b4a9c
SHA512 41cb08ad69b0628bd853407fd28a1c612cfe06245f799dd9f01486500abe625c3e872c0a70e666b487e7b7e3556650c5e2e873f1d56dc5d2d893aed4f1d794f0

Analysis: behavioral2

Detonation Overview

Submitted

2023-12-19 18:00

Reported

2023-12-20 00:16

Platform

win10v2004-20231215-en

Max time kernel

91s

Max time network

125s

Command Line

"C:\Users\Admin\AppData\Local\Temp\70bdc622d4ecb4da6eb1d3a5f98652ab.exe"

Signatures

Processes

C:\Users\Admin\AppData\Local\Temp\70bdc622d4ecb4da6eb1d3a5f98652ab.exe

"C:\Users\Admin\AppData\Local\Temp\70bdc622d4ecb4da6eb1d3a5f98652ab.exe"

C:\Users\Admin\AppData\Local\Temp\70bdc622d4ecb4da6eb1d3a5f98652ab.exe

"C:\Users\Admin\AppData\Local\Temp\70bdc622d4ecb4da6eb1d3a5f98652ab.exe"

C:\Windows\SysWOW64\WerFault.exe

C:\Windows\SysWOW64\WerFault.exe -pss -s 452 -p 2776 -ip 2776

C:\Windows\SysWOW64\WerFault.exe

C:\Windows\SysWOW64\WerFault.exe -u -p 2776 -s 952

Network

Country Destination Domain Proto
US 8.8.8.8:53 16.53.126.40.in-addr.arpa udp
US 8.8.8.8:53 241.154.82.20.in-addr.arpa udp
US 8.8.8.8:53 0.204.248.87.in-addr.arpa udp
US 8.8.8.8:53 41.110.16.96.in-addr.arpa udp
US 8.8.8.8:53 95.221.229.192.in-addr.arpa udp
US 8.8.8.8:53 183.59.114.20.in-addr.arpa udp
US 8.8.8.8:53 18.31.95.13.in-addr.arpa udp
US 8.8.8.8:53 217.135.221.88.in-addr.arpa udp
US 8.8.8.8:53 0.205.248.87.in-addr.arpa udp

Files

C:\Users\Admin\AppData\Local\Temp\nsb4A0A.tmp\System.dll

MD5 fccff8cb7a1067e23fd2e2b63971a8e1
SHA1 30e2a9e137c1223a78a0f7b0bf96a1c361976d91
SHA256 6fcea34c8666b06368379c6c402b5321202c11b00889401c743fb96c516c679e
SHA512 f4335e84e6f8d70e462a22f1c93d2998673a7616c868177cac3e8784a3be1d7d0bb96f2583fa0ed82f4f2b6b8f5d9b33521c279a42e055d80a94b4f3f1791e0c