Malware Analysis Report

2025-08-10 19:32

Sample ID 240224-nypa1abe4s
Target a1cbb55f6316a7a7ef379e9b09802835
SHA256 87b9a803fb991bd9e508b55bb01fb657e505d7bd077bc18ce13d0ea518f202fd
Tags
cobaltstrike 1627331580 backdoor trojan
score
10/10

Table of Contents

Analysis Overview

MITRE ATT&CK

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

87b9a803fb991bd9e508b55bb01fb657e505d7bd077bc18ce13d0ea518f202fd

Threat Level: Known bad

The file a1cbb55f6316a7a7ef379e9b09802835 was found to be: Known bad.

Malicious Activity Summary

cobaltstrike 1627331580 backdoor trojan

Cobaltstrike

Suspicious use of SetThreadContext

Unsigned PE

Suspicious use of WriteProcessMemory

MITRE ATT&CK

N/A

Analysis: static1

Detonation Overview

Reported

2024-02-24 11:48

Signatures

Unsigned PE

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

Analysis: behavioral1

Detonation Overview

Submitted

2024-02-24 11:48

Reported

2024-02-24 11:51

Platform

win7-20240221-en

Max time kernel

118s

Max time network

120s

Command Line

rundll32.exe C:\Users\Admin\AppData\Local\Temp\a1cbb55f6316a7a7ef379e9b09802835.dll,#1

Signatures

Cobaltstrike

trojan backdoor cobaltstrike

Suspicious use of SetThreadContext

Description Indicator Process Target
PID 2300 set thread context of 1828 N/A C:\Windows\system32\rundll32.exe C:\Windows\system32\rundll32.exe

Suspicious use of WriteProcessMemory

Description Indicator Process Target
PID 2300 wrote to memory of 1828 N/A C:\Windows\system32\rundll32.exe C:\Windows\system32\rundll32.exe
PID 2300 wrote to memory of 1828 N/A C:\Windows\system32\rundll32.exe C:\Windows\system32\rundll32.exe
PID 2300 wrote to memory of 1828 N/A C:\Windows\system32\rundll32.exe C:\Windows\system32\rundll32.exe
PID 2300 wrote to memory of 1828 N/A C:\Windows\system32\rundll32.exe C:\Windows\system32\rundll32.exe
PID 2300 wrote to memory of 1828 N/A C:\Windows\system32\rundll32.exe C:\Windows\system32\rundll32.exe

Processes

C:\Windows\system32\rundll32.exe

rundll32.exe C:\Users\Admin\AppData\Local\Temp\a1cbb55f6316a7a7ef379e9b09802835.dll,#1

C:\Windows\system32\rundll32.exe

C:\Windows\system32\rundll32.exe

Network

N/A

Files

memory/1828-0-0x0000000000400000-0x0000000000452000-memory.dmp

memory/1828-2-0x000007FFFFFDE000-0x000007FFFFFDF000-memory.dmp

memory/1828-4-0x0000000000400000-0x0000000000452000-memory.dmp

memory/1828-6-0x0000000000400000-0x0000000000452000-memory.dmp

memory/1828-7-0x0000000000400000-0x0000000000452000-memory.dmp

memory/1828-9-0x0000000000150000-0x0000000000191000-memory.dmp

memory/1828-11-0x000007FEF7160000-0x000007FEF7200000-memory.dmp

memory/1828-12-0x0000000000400000-0x0000000000452000-memory.dmp

Analysis: behavioral2

Detonation Overview

Submitted

2024-02-24 11:48

Reported

2024-02-24 11:51

Platform

win10v2004-20240221-en

Max time kernel

92s

Max time network

126s

Command Line

rundll32.exe C:\Users\Admin\AppData\Local\Temp\a1cbb55f6316a7a7ef379e9b09802835.dll,#1

Signatures

Cobaltstrike

trojan backdoor cobaltstrike

Suspicious use of SetThreadContext

Description Indicator Process Target
PID 3080 set thread context of 872 N/A C:\Windows\system32\rundll32.exe C:\Windows\system32\rundll32.exe

Suspicious use of WriteProcessMemory

Description Indicator Process Target
PID 3080 wrote to memory of 872 N/A C:\Windows\system32\rundll32.exe C:\Windows\system32\rundll32.exe
PID 3080 wrote to memory of 872 N/A C:\Windows\system32\rundll32.exe C:\Windows\system32\rundll32.exe
PID 3080 wrote to memory of 872 N/A C:\Windows\system32\rundll32.exe C:\Windows\system32\rundll32.exe
PID 3080 wrote to memory of 872 N/A C:\Windows\system32\rundll32.exe C:\Windows\system32\rundll32.exe

Processes

C:\Windows\system32\rundll32.exe

rundll32.exe C:\Users\Admin\AppData\Local\Temp\a1cbb55f6316a7a7ef379e9b09802835.dll,#1

C:\Windows\system32\rundll32.exe

C:\Windows\system32\rundll32.exe

Network

Country Destination Domain Proto
US 8.8.8.8:53 g.bing.com udp
US 204.79.197.200:443 g.bing.com tcp
US 8.8.8.8:53 200.197.79.204.in-addr.arpa udp
US 8.8.8.8:53 180.178.17.96.in-addr.arpa udp
US 8.8.8.8:53 69.31.126.40.in-addr.arpa udp
US 8.8.8.8:53 88.156.103.20.in-addr.arpa udp
US 8.8.8.8:53 9.228.82.20.in-addr.arpa udp
US 8.8.8.8:53 41.110.16.96.in-addr.arpa udp
US 8.8.8.8:53 103.169.127.40.in-addr.arpa udp
US 8.8.8.8:53 56.126.166.20.in-addr.arpa udp
US 8.8.8.8:53 217.135.221.88.in-addr.arpa udp
US 8.8.8.8:53 194.178.17.96.in-addr.arpa udp
US 8.8.8.8:53 43.229.111.52.in-addr.arpa udp
US 8.8.8.8:53 173.178.17.96.in-addr.arpa udp

Files

memory/872-0-0x0000000000400000-0x0000000000452000-memory.dmp

memory/872-2-0x0000000000400000-0x0000000000452000-memory.dmp

memory/872-4-0x0000000000400000-0x0000000000452000-memory.dmp

memory/872-6-0x00000243E1920000-0x00000243E1961000-memory.dmp

memory/872-8-0x00007FFC3B460000-0x00007FFC3B510000-memory.dmp

memory/872-9-0x0000000000400000-0x0000000000452000-memory.dmp