Malware Analysis Report

2024-11-13 13:57

Sample ID 240407-ypf85sdd54
Target 33b85c107eaa0b827d8d86ecc1634a4638243e2ee9817746517e30fcd8a6be81
SHA256 33b85c107eaa0b827d8d86ecc1634a4638243e2ee9817746517e30fcd8a6be81
Tags
bootkit persistence spyware stealer
score
9/10

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
9/10

SHA256

33b85c107eaa0b827d8d86ecc1634a4638243e2ee9817746517e30fcd8a6be81

Threat Level: Likely malicious

The file 33b85c107eaa0b827d8d86ecc1634a4638243e2ee9817746517e30fcd8a6be81 was found to be: Likely malicious.

Malicious Activity Summary

bootkit persistence spyware stealer

Detects executables containing base64 encoded User Agent

Blocklisted process makes network request

Reads user/profile data of web browsers

Adds Run key to start application

Enumerates connected drives

Writes to the Master Boot Record (MBR)

Unsigned PE

Checks processor information in registry

Suspicious behavior: EnumeratesProcesses

Suspicious use of WriteProcessMemory

Suspicious use of AdjustPrivilegeToken

MITRE ATT&CK

Analysis: static1

Detonation Overview

Reported

2024-04-07 19:57

Signatures

Unsigned PE

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

Analysis: behavioral1

Detonation Overview

Submitted

2024-04-07 19:57

Reported

2024-04-07 20:00

Platform

win7-20240215-en

Max time kernel

140s

Max time network

149s

Command Line

rundll32.exe C:\Users\Admin\AppData\Local\Temp\33b85c107eaa0b827d8d86ecc1634a4638243e2ee9817746517e30fcd8a6be81.dll,#1

Signatures

Detects executables containing base64 encoded User Agent

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

Reads user/profile data of web browsers

spyware stealer

Adds Run key to start application

persistence
Description Indicator Process Target
Set value (str) \REGISTRY\USER\S-1-5-21-2248906074-2862704502-246302768-1000\Software\Microsoft\Windows\CurrentVersion\Run\gc = "C:\\Windows\\SysWOW64\\rundll32.exe \"C:\\Users\\Admin\\AppData\\Local\\Temp\\33b85c107eaa0b827d8d86ecc1634a4638243e2ee9817746517e30fcd8a6be81.dll\",GetColor" C:\Windows\SysWOW64\rundll32.exe N/A

Enumerates connected drives

Description Indicator Process Target
File opened (read-only) \??\h: C:\Windows\SysWOW64\rundll32.exe N/A
File opened (read-only) \??\j: C:\Windows\SysWOW64\rundll32.exe N/A
File opened (read-only) \??\n: C:\Windows\SysWOW64\rundll32.exe N/A
File opened (read-only) \??\q: C:\Windows\SysWOW64\rundll32.exe N/A
File opened (read-only) \??\s: C:\Windows\SysWOW64\rundll32.exe N/A
File opened (read-only) \??\u: C:\Windows\SysWOW64\rundll32.exe N/A
File opened (read-only) \??\x: C:\Windows\SysWOW64\rundll32.exe N/A
File opened (read-only) \??\b: C:\Windows\SysWOW64\rundll32.exe N/A
File opened (read-only) \??\i: C:\Windows\SysWOW64\rundll32.exe N/A
File opened (read-only) \??\k: C:\Windows\SysWOW64\rundll32.exe N/A
File opened (read-only) \??\l: C:\Windows\SysWOW64\rundll32.exe N/A
File opened (read-only) \??\p: C:\Windows\SysWOW64\rundll32.exe N/A
File opened (read-only) \??\r: C:\Windows\SysWOW64\rundll32.exe N/A
File opened (read-only) \??\t: C:\Windows\SysWOW64\rundll32.exe N/A
File opened (read-only) \??\w: C:\Windows\SysWOW64\rundll32.exe N/A
File opened (read-only) \??\g: C:\Windows\SysWOW64\rundll32.exe N/A
File opened (read-only) \??\m: C:\Windows\SysWOW64\rundll32.exe N/A
File opened (read-only) \??\a: C:\Windows\SysWOW64\rundll32.exe N/A
File opened (read-only) \??\e: C:\Windows\SysWOW64\rundll32.exe N/A
File opened (read-only) \??\o: C:\Windows\SysWOW64\rundll32.exe N/A
File opened (read-only) \??\v: C:\Windows\SysWOW64\rundll32.exe N/A
File opened (read-only) \??\y: C:\Windows\SysWOW64\rundll32.exe N/A
File opened (read-only) \??\z: C:\Windows\SysWOW64\rundll32.exe N/A

Writes to the Master Boot Record (MBR)

bootkit persistence
Description Indicator Process Target
File opened for modification \??\PHYSICALDRIVE0 C:\Windows\SysWOW64\rundll32.exe N/A

Checks processor information in registry

Description Indicator Process Target
Key opened \REGISTRY\MACHINE\HARDWARE\DESCRIPTION\System\CentralProcessor\0 C:\Windows\SysWOW64\rundll32.exe N/A
Key value queried \REGISTRY\MACHINE\HARDWARE\DESCRIPTION\System\CentralProcessor\0\ProcessorNameString C:\Windows\SysWOW64\rundll32.exe N/A

Suspicious behavior: EnumeratesProcesses

Description Indicator Process Target
N/A N/A C:\Windows\SysWOW64\rundll32.exe N/A
N/A N/A C:\Windows\SysWOW64\rundll32.exe N/A

Suspicious use of AdjustPrivilegeToken

Description Indicator Process Target
Token: SeDebugPrivilege N/A C:\Windows\SysWOW64\rundll32.exe N/A

Suspicious use of WriteProcessMemory

Description Indicator Process Target
PID 1512 wrote to memory of 2336 N/A C:\Windows\system32\rundll32.exe C:\Windows\SysWOW64\rundll32.exe
PID 1512 wrote to memory of 2336 N/A C:\Windows\system32\rundll32.exe C:\Windows\SysWOW64\rundll32.exe
PID 1512 wrote to memory of 2336 N/A C:\Windows\system32\rundll32.exe C:\Windows\SysWOW64\rundll32.exe
PID 1512 wrote to memory of 2336 N/A C:\Windows\system32\rundll32.exe C:\Windows\SysWOW64\rundll32.exe
PID 1512 wrote to memory of 2336 N/A C:\Windows\system32\rundll32.exe C:\Windows\SysWOW64\rundll32.exe
PID 1512 wrote to memory of 2336 N/A C:\Windows\system32\rundll32.exe C:\Windows\SysWOW64\rundll32.exe
PID 1512 wrote to memory of 2336 N/A C:\Windows\system32\rundll32.exe C:\Windows\SysWOW64\rundll32.exe

Processes

C:\Windows\system32\rundll32.exe

rundll32.exe C:\Users\Admin\AppData\Local\Temp\33b85c107eaa0b827d8d86ecc1634a4638243e2ee9817746517e30fcd8a6be81.dll,#1

C:\Windows\SysWOW64\rundll32.exe

rundll32.exe C:\Users\Admin\AppData\Local\Temp\33b85c107eaa0b827d8d86ecc1634a4638243e2ee9817746517e30fcd8a6be81.dll,#1

Network

Country Destination Domain Proto
US 174.139.6.44:803 tcp
US 107.163.56.110:18530 107.163.56.110 tcp
US 174.139.6.44:803 tcp
US 174.139.6.42:3204 tcp
US 174.139.6.43:805 tcp
US 174.139.6.43:805 tcp
US 174.139.6.43:805 tcp
US 174.139.6.43:805 tcp
US 174.139.6.42:3204 tcp
US 174.139.6.42:3204 tcp
US 174.139.6.42:3204 tcp

Files

memory/2336-0-0x0000000010000000-0x000000001004E000-memory.dmp

memory/2336-1-0x0000000010000000-0x000000001004E000-memory.dmp

memory/2336-2-0x0000000010000000-0x000000001004E000-memory.dmp

memory/2336-4-0x0000000010000000-0x000000001004E000-memory.dmp

memory/2336-3-0x0000000010000000-0x000000001004E000-memory.dmp

memory/2336-5-0x0000000000190000-0x0000000000192000-memory.dmp

memory/2336-6-0x0000000010000000-0x000000001004E000-memory.dmp

memory/2336-7-0x0000000010000000-0x000000001004E000-memory.dmp

memory/2336-11-0x0000000010000000-0x000000001004E000-memory.dmp

memory/2336-12-0x0000000010000000-0x000000001004E000-memory.dmp

Analysis: behavioral2

Detonation Overview

Submitted

2024-04-07 19:57

Reported

2024-04-07 20:00

Platform

win10v2004-20240226-en

Max time kernel

148s

Max time network

151s

Command Line

rundll32.exe C:\Users\Admin\AppData\Local\Temp\33b85c107eaa0b827d8d86ecc1634a4638243e2ee9817746517e30fcd8a6be81.dll,#1

Signatures

Detects executables containing base64 encoded User Agent

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

Reads user/profile data of web browsers

spyware stealer

Adds Run key to start application

persistence
Description Indicator Process Target
Set value (str) \REGISTRY\USER\S-1-5-21-399997616-3400990511-967324271-1000\SOFTWARE\Microsoft\Windows\CurrentVersion\Run\gc = "C:\\Windows\\SysWOW64\\rundll32.exe \"C:\\Users\\Admin\\AppData\\Local\\Temp\\33b85c107eaa0b827d8d86ecc1634a4638243e2ee9817746517e30fcd8a6be81.dll\",GetColor" C:\Windows\SysWOW64\rundll32.exe N/A

Enumerates connected drives

Description Indicator Process Target
File opened (read-only) \??\u: C:\Windows\SysWOW64\rundll32.exe N/A
File opened (read-only) \??\x: C:\Windows\SysWOW64\rundll32.exe N/A
File opened (read-only) \??\z: C:\Windows\SysWOW64\rundll32.exe N/A
File opened (read-only) \??\h: C:\Windows\SysWOW64\rundll32.exe N/A
File opened (read-only) \??\i: C:\Windows\SysWOW64\rundll32.exe N/A
File opened (read-only) \??\o: C:\Windows\SysWOW64\rundll32.exe N/A
File opened (read-only) \??\q: C:\Windows\SysWOW64\rundll32.exe N/A
File opened (read-only) \??\l: C:\Windows\SysWOW64\rundll32.exe N/A
File opened (read-only) \??\v: C:\Windows\SysWOW64\rundll32.exe N/A
File opened (read-only) \??\b: C:\Windows\SysWOW64\rundll32.exe N/A
File opened (read-only) \??\g: C:\Windows\SysWOW64\rundll32.exe N/A
File opened (read-only) \??\j: C:\Windows\SysWOW64\rundll32.exe N/A
File opened (read-only) \??\k: C:\Windows\SysWOW64\rundll32.exe N/A
File opened (read-only) \??\m: C:\Windows\SysWOW64\rundll32.exe N/A
File opened (read-only) \??\n: C:\Windows\SysWOW64\rundll32.exe N/A
File opened (read-only) \??\p: C:\Windows\SysWOW64\rundll32.exe N/A
File opened (read-only) \??\r: C:\Windows\SysWOW64\rundll32.exe N/A
File opened (read-only) \??\w: C:\Windows\SysWOW64\rundll32.exe N/A
File opened (read-only) \??\y: C:\Windows\SysWOW64\rundll32.exe N/A
File opened (read-only) \??\a: C:\Windows\SysWOW64\rundll32.exe N/A
File opened (read-only) \??\e: C:\Windows\SysWOW64\rundll32.exe N/A
File opened (read-only) \??\s: C:\Windows\SysWOW64\rundll32.exe N/A
File opened (read-only) \??\t: C:\Windows\SysWOW64\rundll32.exe N/A

Writes to the Master Boot Record (MBR)

bootkit persistence
Description Indicator Process Target
File opened for modification \??\PHYSICALDRIVE0 C:\Windows\SysWOW64\rundll32.exe N/A

Checks processor information in registry

Description Indicator Process Target
Key opened \REGISTRY\MACHINE\HARDWARE\DESCRIPTION\System\CentralProcessor\0 C:\Windows\SysWOW64\rundll32.exe N/A
Key value queried \REGISTRY\MACHINE\HARDWARE\DESCRIPTION\System\CentralProcessor\0\ProcessorNameString C:\Windows\SysWOW64\rundll32.exe N/A

Suspicious behavior: EnumeratesProcesses

Description Indicator Process Target
N/A N/A C:\Windows\SysWOW64\rundll32.exe N/A
N/A N/A C:\Windows\SysWOW64\rundll32.exe N/A
N/A N/A C:\Windows\SysWOW64\rundll32.exe N/A
N/A N/A C:\Windows\SysWOW64\rundll32.exe N/A

Suspicious use of AdjustPrivilegeToken

Description Indicator Process Target
Token: SeDebugPrivilege N/A C:\Windows\SysWOW64\rundll32.exe N/A

Suspicious use of WriteProcessMemory

Description Indicator Process Target
PID 3668 wrote to memory of 3052 N/A C:\Windows\system32\rundll32.exe C:\Windows\SysWOW64\rundll32.exe
PID 3668 wrote to memory of 3052 N/A C:\Windows\system32\rundll32.exe C:\Windows\SysWOW64\rundll32.exe
PID 3668 wrote to memory of 3052 N/A C:\Windows\system32\rundll32.exe C:\Windows\SysWOW64\rundll32.exe

Processes

C:\Windows\system32\rundll32.exe

rundll32.exe C:\Users\Admin\AppData\Local\Temp\33b85c107eaa0b827d8d86ecc1634a4638243e2ee9817746517e30fcd8a6be81.dll,#1

C:\Windows\SysWOW64\rundll32.exe

rundll32.exe C:\Users\Admin\AppData\Local\Temp\33b85c107eaa0b827d8d86ecc1634a4638243e2ee9817746517e30fcd8a6be81.dll,#1

Network

Country Destination Domain Proto
US 8.8.8.8:53 154.239.44.20.in-addr.arpa udp
US 8.8.8.8:53 249.197.17.2.in-addr.arpa udp
US 174.139.6.44:803 tcp
US 8.8.8.8:53 140.32.126.40.in-addr.arpa udp
US 107.163.56.110:18530 107.163.56.110 tcp
US 8.8.8.8:53 228.249.119.40.in-addr.arpa udp
US 8.8.8.8:53 110.56.163.107.in-addr.arpa udp
US 8.8.8.8:53 58.55.71.13.in-addr.arpa udp
US 174.139.6.42:3204 tcp
US 174.139.6.43:805 tcp
US 174.139.6.43:805 tcp
US 8.8.8.8:53 50.23.12.20.in-addr.arpa udp
US 8.8.8.8:53 56.126.166.20.in-addr.arpa udp
US 8.8.8.8:53 98.56.20.217.in-addr.arpa udp
US 174.139.6.43:805 tcp
US 174.139.6.42:3204 tcp
US 8.8.8.8:53 172.210.232.199.in-addr.arpa udp
US 174.139.6.42:3204 tcp
US 8.8.8.8:53 11.227.111.52.in-addr.arpa udp
US 8.8.8.8:53 99.56.20.217.in-addr.arpa udp
US 174.139.6.42:3204 tcp
US 174.139.6.42:3204 tcp

Files

memory/3052-0-0x0000000010000000-0x000000001004E000-memory.dmp

memory/3052-1-0x0000000010000000-0x000000001004E000-memory.dmp

memory/3052-2-0x0000000000C90000-0x0000000000C92000-memory.dmp

memory/3052-3-0x0000000010000000-0x000000001004E000-memory.dmp

memory/3052-4-0x0000000010000000-0x000000001004E000-memory.dmp

memory/3052-6-0x0000000010000000-0x000000001004E000-memory.dmp

memory/3052-8-0x0000000010000000-0x000000001004E000-memory.dmp