Malware Analysis Report

2024-12-07 17:04

Sample ID 241113-c4kdfstraw
Target c5f307b4f92de8f2098c8da83d61a7ec4c42a6a0aa7d22379849b109f8bf2db9
SHA256 c5f307b4f92de8f2098c8da83d61a7ec4c42a6a0aa7d22379849b109f8bf2db9
Tags
defense_evasion discovery upx
score
7/10

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
7/10

SHA256

c5f307b4f92de8f2098c8da83d61a7ec4c42a6a0aa7d22379849b109f8bf2db9

Threat Level: Shows suspicious behavior

The file c5f307b4f92de8f2098c8da83d61a7ec4c42a6a0aa7d22379849b109f8bf2db9 was found to be: Shows suspicious behavior.

Malicious Activity Summary

defense_evasion discovery upx

Checks computer location settings

Deletes itself

Executes dropped EXE

Indicator Removal: File Deletion

UPX packed file

Drops file in Windows directory

Enumerates physical storage devices

System Location Discovery: System Language Discovery

Unsigned PE

Checks processor information in registry

Suspicious use of AdjustPrivilegeToken

Suspicious use of WriteProcessMemory

MITRE ATT&CK

Analysis: static1

Detonation Overview

Reported

2024-11-13 02:37

Signatures

Unsigned PE

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

Analysis: behavioral1

Detonation Overview

Submitted

2024-11-13 02:37

Reported

2024-11-13 02:40

Platform

win7-20241023-en

Max time kernel

140s

Max time network

124s

Command Line

"C:\Users\Admin\AppData\Local\Temp\c5f307b4f92de8f2098c8da83d61a7ec4c42a6a0aa7d22379849b109f8bf2db9.exe"

Signatures

Deletes itself

Description Indicator Process Target
N/A N/A C:\Windows\SysWOW64\cmd.exe N/A

Executes dropped EXE

Description Indicator Process Target
N/A N/A C:\Windows\Debug\rwmhost.exe N/A

Indicator Removal: File Deletion

defense_evasion

UPX packed file

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

Drops file in Windows directory

Description Indicator Process Target
File opened for modification C:\Windows\Debug\rwmhost.exe C:\Users\Admin\AppData\Local\Temp\c5f307b4f92de8f2098c8da83d61a7ec4c42a6a0aa7d22379849b109f8bf2db9.exe N/A
File created C:\Windows\Debug\rwmhost.exe C:\Users\Admin\AppData\Local\Temp\c5f307b4f92de8f2098c8da83d61a7ec4c42a6a0aa7d22379849b109f8bf2db9.exe N/A

Enumerates physical storage devices

System Location Discovery: System Language Discovery

discovery
Description Indicator Process Target
Key opened \REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language C:\Users\Admin\AppData\Local\Temp\c5f307b4f92de8f2098c8da83d61a7ec4c42a6a0aa7d22379849b109f8bf2db9.exe N/A
Key opened \REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language C:\Windows\Debug\rwmhost.exe N/A
Key opened \REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language C:\Windows\SysWOW64\cmd.exe N/A

Checks processor information in registry

Description Indicator Process Target
Key opened \REGISTRY\MACHINE\HARDWARE\DESCRIPTION\System\CentralProcessor\0 C:\Windows\Debug\rwmhost.exe N/A
Key value queried \REGISTRY\MACHINE\HARDWARE\DESCRIPTION\System\CentralProcessor\0\~MHz C:\Windows\Debug\rwmhost.exe N/A

Suspicious use of AdjustPrivilegeToken

Description Indicator Process Target
Token: SeIncBasePriorityPrivilege N/A C:\Users\Admin\AppData\Local\Temp\c5f307b4f92de8f2098c8da83d61a7ec4c42a6a0aa7d22379849b109f8bf2db9.exe N/A

Processes

C:\Users\Admin\AppData\Local\Temp\c5f307b4f92de8f2098c8da83d61a7ec4c42a6a0aa7d22379849b109f8bf2db9.exe

"C:\Users\Admin\AppData\Local\Temp\c5f307b4f92de8f2098c8da83d61a7ec4c42a6a0aa7d22379849b109f8bf2db9.exe"

C:\Windows\Debug\rwmhost.exe

C:\Windows\Debug\rwmhost.exe

C:\Windows\SysWOW64\cmd.exe

"C:\Windows\system32\cmd.exe" /c del C:\Users\Admin\AppData\Local\Temp\C5F307~1.EXE > nul

Network

Country Destination Domain Proto
US 8.8.8.8:53 www.baidu.com udp
HK 103.235.46.96:80 www.baidu.com tcp
N/A 192.168.6.136:8000 tcp
N/A 192.168.6.136:8000 tcp

Files

memory/2244-0-0x0000000010000000-0x000000001000E000-memory.dmp

memory/2244-5-0x0000000010000000-0x000000001000E000-memory.dmp

C:\Windows\debug\rwmhost.exe

MD5 4b097b4931b4412c01671386bef10f33
SHA1 1353d125b4e9f788b1535b92a095ded3cb94de31
SHA256 a3309e8fcb57e973456b4d173fdc2a088f9b510100a3f1697b2b74ce28ab1218
SHA512 74a4e776d46e1551826873e145a7de467be7b095a79678619d0dd1f95205ce8dc56905297a75e6000dac61326643c0c96ddecc23de442a37ed7641f012cd4db9

memory/2948-11-0x0000000010000000-0x000000001000E000-memory.dmp

memory/2948-12-0x0000000010000000-0x000000001000E000-memory.dmp

memory/2948-14-0x0000000010000000-0x000000001000E000-memory.dmp

memory/2948-16-0x0000000010000000-0x000000001000E000-memory.dmp

memory/2948-17-0x0000000010000000-0x000000001000E000-memory.dmp

Analysis: behavioral2

Detonation Overview

Submitted

2024-11-13 02:37

Reported

2024-11-13 02:40

Platform

win10v2004-20241007-en

Max time kernel

141s

Max time network

135s

Command Line

"C:\Users\Admin\AppData\Local\Temp\c5f307b4f92de8f2098c8da83d61a7ec4c42a6a0aa7d22379849b109f8bf2db9.exe"

Signatures

Checks computer location settings

Description Indicator Process Target
Key value queried \REGISTRY\USER\S-1-5-21-940901362-3608833189-1915618603-1000\Control Panel\International\Geo\Nation C:\Users\Admin\AppData\Local\Temp\c5f307b4f92de8f2098c8da83d61a7ec4c42a6a0aa7d22379849b109f8bf2db9.exe N/A

Executes dropped EXE

Description Indicator Process Target
N/A N/A C:\Windows\Debug\bqchost.exe N/A

Indicator Removal: File Deletion

defense_evasion

UPX packed file

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

Drops file in Windows directory

Description Indicator Process Target
File created C:\Windows\Debug\bqchost.exe C:\Users\Admin\AppData\Local\Temp\c5f307b4f92de8f2098c8da83d61a7ec4c42a6a0aa7d22379849b109f8bf2db9.exe N/A
File opened for modification C:\Windows\Debug\bqchost.exe C:\Users\Admin\AppData\Local\Temp\c5f307b4f92de8f2098c8da83d61a7ec4c42a6a0aa7d22379849b109f8bf2db9.exe N/A

Enumerates physical storage devices

System Location Discovery: System Language Discovery

discovery
Description Indicator Process Target
Key opened \REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language C:\Users\Admin\AppData\Local\Temp\c5f307b4f92de8f2098c8da83d61a7ec4c42a6a0aa7d22379849b109f8bf2db9.exe N/A
Key opened \REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language C:\Windows\Debug\bqchost.exe N/A
Key opened \REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language C:\Windows\SysWOW64\cmd.exe N/A

Checks processor information in registry

Description Indicator Process Target
Key opened \REGISTRY\MACHINE\HARDWARE\DESCRIPTION\System\CentralProcessor\0 C:\Windows\Debug\bqchost.exe N/A
Key value queried \REGISTRY\MACHINE\HARDWARE\DESCRIPTION\System\CentralProcessor\0\~MHz C:\Windows\Debug\bqchost.exe N/A

Suspicious use of AdjustPrivilegeToken

Description Indicator Process Target
Token: SeIncBasePriorityPrivilege N/A C:\Users\Admin\AppData\Local\Temp\c5f307b4f92de8f2098c8da83d61a7ec4c42a6a0aa7d22379849b109f8bf2db9.exe N/A

Processes

C:\Users\Admin\AppData\Local\Temp\c5f307b4f92de8f2098c8da83d61a7ec4c42a6a0aa7d22379849b109f8bf2db9.exe

"C:\Users\Admin\AppData\Local\Temp\c5f307b4f92de8f2098c8da83d61a7ec4c42a6a0aa7d22379849b109f8bf2db9.exe"

C:\Windows\Debug\bqchost.exe

C:\Windows\Debug\bqchost.exe

C:\Windows\SysWOW64\cmd.exe

"C:\Windows\system32\cmd.exe" /c del C:\Users\Admin\AppData\Local\Temp\C5F307~1.EXE > nul

Network

Country Destination Domain Proto
US 8.8.8.8:53 133.211.185.52.in-addr.arpa udp
US 8.8.8.8:53 76.32.126.40.in-addr.arpa udp
US 8.8.8.8:53 www.baidu.com udp
HK 103.235.46.96:80 www.baidu.com tcp
US 8.8.8.8:53 95.221.229.192.in-addr.arpa udp
US 8.8.8.8:53 58.55.71.13.in-addr.arpa udp
US 8.8.8.8:53 96.46.235.103.in-addr.arpa udp
US 8.8.8.8:53 196.249.167.52.in-addr.arpa udp
US 8.8.8.8:53 228.249.119.40.in-addr.arpa udp
US 8.8.8.8:53 15.164.165.52.in-addr.arpa udp
US 8.8.8.8:53 50.23.12.20.in-addr.arpa udp
US 8.8.8.8:53 68.209.201.84.in-addr.arpa udp
US 8.8.8.8:53 83.210.23.2.in-addr.arpa udp
N/A 192.168.6.136:8000 tcp
US 8.8.8.8:53 21.236.111.52.in-addr.arpa udp
N/A 192.168.6.136:8000 tcp

Files

memory/1888-0-0x0000000010000000-0x000000001000E000-memory.dmp

memory/1888-3-0x0000000010000000-0x000000001000E000-memory.dmp

C:\Windows\Debug\bqchost.exe

MD5 4b097b4931b4412c01671386bef10f33
SHA1 1353d125b4e9f788b1535b92a095ded3cb94de31
SHA256 a3309e8fcb57e973456b4d173fdc2a088f9b510100a3f1697b2b74ce28ab1218
SHA512 74a4e776d46e1551826873e145a7de467be7b095a79678619d0dd1f95205ce8dc56905297a75e6000dac61326643c0c96ddecc23de442a37ed7641f012cd4db9

memory/4192-11-0x0000000010000000-0x000000001000E000-memory.dmp

memory/4192-12-0x0000000010000000-0x000000001000E000-memory.dmp

memory/1888-13-0x0000000010000000-0x000000001000E000-memory.dmp

memory/4192-15-0x0000000010000000-0x000000001000E000-memory.dmp

memory/4192-17-0x0000000010000000-0x000000001000E000-memory.dmp

memory/4192-18-0x0000000010000000-0x000000001000E000-memory.dmp