Malware Analysis Report

2024-11-13 16:55

Sample ID 201109-k4636f1yz2
Target Valak (9).cab
SHA256 e4093649633b05316196a275bd0845829d0e9a63a78943977f96770b3e74a7f1
Tags
valak Loader
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

e4093649633b05316196a275bd0845829d0e9a63a78943977f96770b3e74a7f1

Threat Level: Known bad

The file Valak (9).cab was found to be: Known bad.

Malicious Activity Summary

valak Loader

Valak

Valak JavaScript Loader

JavaScript code in executable

Suspicious use of WriteProcessMemory

MITRE ATT&CK

N/A

Analysis: static1

Detonation Overview

Reported

2020-11-09 20:42

Signatures

N/A

Analysis: behavioral1

Detonation Overview

Submitted

2020-11-09 20:42

Reported

2020-11-10 23:33

Platform

win7v20201028

Max time kernel

133s

Max time network

135s

Command Line

rundll32.exe "C:\Users\Admin\AppData\Local\Temp\Valak (9).cab.dll",#1

Signatures

Valak

Loader valak

Valak JavaScript Loader

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

JavaScript code in executable

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

Processes

C:\Windows\system32\rundll32.exe

rundll32.exe "C:\Users\Admin\AppData\Local\Temp\Valak (9).cab.dll",#1

C:\Windows\SysWOW64\rundll32.exe

rundll32.exe "C:\Users\Admin\AppData\Local\Temp\Valak (9).cab.dll",#1

C:\Windows\SysWOW64\wscript.exe

wscript.exe //E:jscript "C:\Users\Public\CCGYPWTwr.iySAE

C:\Windows\system32\wbem\WmiApSrv.exe

C:\Windows\system32\wbem\WmiApSrv.exe

Network

Country Destination Domain Proto
N/A 205.185.216.42:80 tcp
N/A 195.123.240.40:443 tcp

Files

memory/1988-0-0x0000000000000000-mapping.dmp

memory/1492-1-0x0000000000000000-mapping.dmp

C:\Users\Public\CCGYPWTwr.iySAE

MD5 6df4cb0a89bdabcf858e7e407e3975f5
SHA1 f41a9efe9f3cdce394893d90f564bb26e3cdd494
SHA256 c65b67bfe6a5acf6ebfb7f327a6ce8f93bfe5ec579fe783f611a73ce031f7232
SHA512 a49817c5b27a75263a57398a17f838e935660d554e6b36d8e11ec20817fd08b532851b527c7255d50556d85e1fa985ed0d766d7103f6178ab8ef8bab561b1a41

memory/1492-3-0x0000000002570000-0x0000000002574000-memory.dmp

Analysis: behavioral2

Detonation Overview

Submitted

2020-11-09 20:42

Reported

2020-11-10 23:33

Platform

win10v20201028

Max time kernel

144s

Max time network

146s

Command Line

rundll32.exe "C:\Users\Admin\AppData\Local\Temp\Valak (9).cab.dll",#1

Signatures

Valak

Loader valak

Valak JavaScript Loader

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

JavaScript code in executable

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

Suspicious use of WriteProcessMemory

Description Indicator Process Target
PID 1628 wrote to memory of 856 N/A C:\Windows\system32\rundll32.exe C:\Windows\SysWOW64\rundll32.exe
PID 1628 wrote to memory of 856 N/A C:\Windows\system32\rundll32.exe C:\Windows\SysWOW64\rundll32.exe
PID 1628 wrote to memory of 856 N/A C:\Windows\system32\rundll32.exe C:\Windows\SysWOW64\rundll32.exe
PID 856 wrote to memory of 2280 N/A C:\Windows\SysWOW64\rundll32.exe C:\Windows\SysWOW64\wscript.exe
PID 856 wrote to memory of 2280 N/A C:\Windows\SysWOW64\rundll32.exe C:\Windows\SysWOW64\wscript.exe
PID 856 wrote to memory of 2280 N/A C:\Windows\SysWOW64\rundll32.exe C:\Windows\SysWOW64\wscript.exe

Processes

C:\Windows\system32\rundll32.exe

rundll32.exe "C:\Users\Admin\AppData\Local\Temp\Valak (9).cab.dll",#1

C:\Windows\SysWOW64\rundll32.exe

rundll32.exe "C:\Users\Admin\AppData\Local\Temp\Valak (9).cab.dll",#1

C:\Windows\SysWOW64\wscript.exe

wscript.exe //E:jscript "C:\Users\Public\CCGYPWTwr.iySAE

C:\Windows\system32\wbem\WmiApSrv.exe

C:\Windows\system32\wbem\WmiApSrv.exe

Network

N/A

Files

memory/856-0-0x0000000000000000-mapping.dmp

memory/2280-1-0x0000000000000000-mapping.dmp

C:\Users\Public\CCGYPWTwr.iySAE

MD5 6df4cb0a89bdabcf858e7e407e3975f5
SHA1 f41a9efe9f3cdce394893d90f564bb26e3cdd494
SHA256 c65b67bfe6a5acf6ebfb7f327a6ce8f93bfe5ec579fe783f611a73ce031f7232
SHA512 a49817c5b27a75263a57398a17f838e935660d554e6b36d8e11ec20817fd08b532851b527c7255d50556d85e1fa985ed0d766d7103f6178ab8ef8bab561b1a41