Malware Analysis Report

2024-11-15 09:09

Sample ID 201007-s21dy8tfds
Target wymuq1.cab
SHA256 3fd4fb0b21f1d754bd0a1457c76d194a5723e21900bfe6aef75c376079391e98
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

3fd4fb0b21f1d754bd0a1457c76d194a5723e21900bfe6aef75c376079391e98

Threat Level: Known bad

The file wymuq1.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

2020-10-07 21:16

Signatures

JavaScript code in executable

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

Analysis: behavioral1

Detonation Overview

Submitted

2020-10-07 21:16

Reported

2020-10-07 21:18

Platform

win7

Max time kernel

128s

Max time network

16s

Command Line

rundll32.exe C:\Users\Admin\AppData\Local\Temp\wymuq1.cab.dll,#1

Signatures

Valak

Loader valak

Valak JavaScript Loader

Description Indicator Process Target
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\wymuq1.cab.dll,#1

C:\Windows\SysWOW64\rundll32.exe

rundll32.exe C:\Users\Admin\AppData\Local\Temp\wymuq1.cab.dll,#1

C:\Windows\SysWOW64\wscript.exe

wscript.exe //E:jscript "C:\Users\Public\IdfscyvPV.N_Dya

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

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

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

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

Network

N/A

Files

memory/276-0-0x0000000000000000-mapping.dmp

memory/768-1-0x0000000000000000-mapping.dmp

C:\Users\Public\IdfscyvPV.N_Dya

MD5 fd0af86fd3e8a72fd440e93083aa089a
SHA1 0b3cd092f3e9f0aed4cbd43b9794d90507f1522f
SHA256 af1077125ad15df0edbdb95f478547e37ba34854509f8f3ac9c7576ab4728884
SHA512 45922109013ad3c9d962946608e442e2d33c60f9d2c2d047f5e2942fbac1f48946002ee659da1afffcee06650c7d09fe81dd632ae134d53c87da11f7119a7fd7

memory/768-3-0x00000000028A0000-0x00000000028A4000-memory.dmp

Analysis: behavioral2

Detonation Overview

Submitted

2020-10-07 21:16

Reported

2020-10-07 21:18

Platform

win10

Max time kernel

123s

Max time network

153s

Command Line

rundll32.exe C:\Users\Admin\AppData\Local\Temp\wymuq1.cab.dll,#1

Signatures

Valak

Loader valak

Valak JavaScript Loader

Description Indicator Process Target
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 3024 wrote to memory of 3780 N/A C:\Windows\system32\rundll32.exe C:\Windows\SysWOW64\rundll32.exe
PID 3024 wrote to memory of 3780 N/A C:\Windows\system32\rundll32.exe C:\Windows\SysWOW64\rundll32.exe
PID 3024 wrote to memory of 3780 N/A C:\Windows\system32\rundll32.exe C:\Windows\SysWOW64\rundll32.exe
PID 3780 wrote to memory of 744 N/A C:\Windows\SysWOW64\rundll32.exe C:\Windows\SysWOW64\wscript.exe
PID 3780 wrote to memory of 744 N/A C:\Windows\SysWOW64\rundll32.exe C:\Windows\SysWOW64\wscript.exe
PID 3780 wrote to memory of 744 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\wymuq1.cab.dll,#1

C:\Windows\SysWOW64\rundll32.exe

rundll32.exe C:\Users\Admin\AppData\Local\Temp\wymuq1.cab.dll,#1

C:\Windows\SysWOW64\wscript.exe

wscript.exe //E:jscript "C:\Users\Public\IdfscyvPV.N_Dya

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

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

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

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

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

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

Network

Country Destination Domain Proto
N/A 52.109.12.18:443 tcp

Files

memory/3780-0-0x0000000000000000-mapping.dmp

memory/744-1-0x0000000000000000-mapping.dmp

C:\Users\Public\IdfscyvPV.N_Dya

MD5 fd0af86fd3e8a72fd440e93083aa089a
SHA1 0b3cd092f3e9f0aed4cbd43b9794d90507f1522f
SHA256 af1077125ad15df0edbdb95f478547e37ba34854509f8f3ac9c7576ab4728884
SHA512 45922109013ad3c9d962946608e442e2d33c60f9d2c2d047f5e2942fbac1f48946002ee659da1afffcee06650c7d09fe81dd632ae134d53c87da11f7119a7fd7