Malware Analysis Report

2024-10-19 08:13

Sample ID 240810-q22fvasakq
Target f05a9ea1aa0a3f710c58366adf8c58ee9525537cbf2f621f753bd4a1ff5db8f3
SHA256 f05a9ea1aa0a3f710c58366adf8c58ee9525537cbf2f621f753bd4a1ff5db8f3
Tags
vanillarat discovery rat
score
10/10

Table of Contents

Analysis Overview

MITRE ATT&CK

Enterprise Matrix V15

Analysis: static1

Detonation Overview

Signatures

Analysis: behavioral2

Detonation Overview

Command Line

Signatures

Processes

Network

Files

Analysis: behavioral1

Detonation Overview

Command Line

Signatures

Processes

Network

Files

Analysis Overview

score
10/10

SHA256

f05a9ea1aa0a3f710c58366adf8c58ee9525537cbf2f621f753bd4a1ff5db8f3

Threat Level: Known bad

The file f05a9ea1aa0a3f710c58366adf8c58ee9525537cbf2f621f753bd4a1ff5db8f3 was found to be: Known bad.

Malicious Activity Summary

vanillarat discovery rat

VanillaRat

Vanilla Rat payload

Executes dropped EXE

Loads dropped DLL

Suspicious use of SetThreadContext

System Location Discovery: System Language Discovery

Unsigned PE

Suspicious behavior: EnumeratesProcesses

Suspicious use of WriteProcessMemory

Suspicious use of AdjustPrivilegeToken

MITRE ATT&CK

Analysis: static1

Detonation Overview

Reported

2024-08-10 13:46

Signatures

Unsigned PE

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

Analysis: behavioral2

Detonation Overview

Submitted

2024-08-10 13:46

Reported

2024-08-10 13:48

Platform

win10v2004-20240802-en

Max time kernel

144s

Max time network

126s

Command Line

"C:\Users\Admin\AppData\Local\Temp\f05a9ea1aa0a3f710c58366adf8c58ee9525537cbf2f621f753bd4a1ff5db8f3.exe"

Signatures

VanillaRat

rat vanillarat

Vanilla Rat payload

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

Executes dropped EXE

Description Indicator Process Target
N/A N/A C:\Users\Admin\AppData\Roaming\MSBuild.exe N/A

Suspicious use of SetThreadContext

Description Indicator Process Target
PID 4444 set thread context of 2492 N/A C:\Users\Admin\AppData\Local\Temp\f05a9ea1aa0a3f710c58366adf8c58ee9525537cbf2f621f753bd4a1ff5db8f3.exe C:\Windows\Microsoft.NET\Framework\v4.0.30319\MSBuild.exe

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\f05a9ea1aa0a3f710c58366adf8c58ee9525537cbf2f621f753bd4a1ff5db8f3.exe N/A
Key opened \REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language C:\Windows\Microsoft.NET\Framework\v4.0.30319\MSBuild.exe N/A
Key opened \REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language C:\Users\Admin\AppData\Roaming\MSBuild.exe N/A

Suspicious use of AdjustPrivilegeToken

Description Indicator Process Target
Token: SeDebugPrivilege N/A C:\Users\Admin\AppData\Local\Temp\f05a9ea1aa0a3f710c58366adf8c58ee9525537cbf2f621f753bd4a1ff5db8f3.exe N/A
Token: SeDebugPrivilege N/A C:\Windows\Microsoft.NET\Framework\v4.0.30319\MSBuild.exe N/A

Suspicious use of WriteProcessMemory

Description Indicator Process Target
PID 4444 wrote to memory of 732 N/A C:\Users\Admin\AppData\Local\Temp\f05a9ea1aa0a3f710c58366adf8c58ee9525537cbf2f621f753bd4a1ff5db8f3.exe C:\Windows\Microsoft.NET\Framework\v4.0.30319\MSBuild.exe
PID 4444 wrote to memory of 732 N/A C:\Users\Admin\AppData\Local\Temp\f05a9ea1aa0a3f710c58366adf8c58ee9525537cbf2f621f753bd4a1ff5db8f3.exe C:\Windows\Microsoft.NET\Framework\v4.0.30319\MSBuild.exe
PID 4444 wrote to memory of 732 N/A C:\Users\Admin\AppData\Local\Temp\f05a9ea1aa0a3f710c58366adf8c58ee9525537cbf2f621f753bd4a1ff5db8f3.exe C:\Windows\Microsoft.NET\Framework\v4.0.30319\MSBuild.exe
PID 4444 wrote to memory of 2492 N/A C:\Users\Admin\AppData\Local\Temp\f05a9ea1aa0a3f710c58366adf8c58ee9525537cbf2f621f753bd4a1ff5db8f3.exe C:\Windows\Microsoft.NET\Framework\v4.0.30319\MSBuild.exe
PID 4444 wrote to memory of 2492 N/A C:\Users\Admin\AppData\Local\Temp\f05a9ea1aa0a3f710c58366adf8c58ee9525537cbf2f621f753bd4a1ff5db8f3.exe C:\Windows\Microsoft.NET\Framework\v4.0.30319\MSBuild.exe
PID 4444 wrote to memory of 2492 N/A C:\Users\Admin\AppData\Local\Temp\f05a9ea1aa0a3f710c58366adf8c58ee9525537cbf2f621f753bd4a1ff5db8f3.exe C:\Windows\Microsoft.NET\Framework\v4.0.30319\MSBuild.exe
PID 4444 wrote to memory of 2492 N/A C:\Users\Admin\AppData\Local\Temp\f05a9ea1aa0a3f710c58366adf8c58ee9525537cbf2f621f753bd4a1ff5db8f3.exe C:\Windows\Microsoft.NET\Framework\v4.0.30319\MSBuild.exe
PID 4444 wrote to memory of 2492 N/A C:\Users\Admin\AppData\Local\Temp\f05a9ea1aa0a3f710c58366adf8c58ee9525537cbf2f621f753bd4a1ff5db8f3.exe C:\Windows\Microsoft.NET\Framework\v4.0.30319\MSBuild.exe
PID 4444 wrote to memory of 2492 N/A C:\Users\Admin\AppData\Local\Temp\f05a9ea1aa0a3f710c58366adf8c58ee9525537cbf2f621f753bd4a1ff5db8f3.exe C:\Windows\Microsoft.NET\Framework\v4.0.30319\MSBuild.exe
PID 4444 wrote to memory of 2492 N/A C:\Users\Admin\AppData\Local\Temp\f05a9ea1aa0a3f710c58366adf8c58ee9525537cbf2f621f753bd4a1ff5db8f3.exe C:\Windows\Microsoft.NET\Framework\v4.0.30319\MSBuild.exe
PID 4444 wrote to memory of 2492 N/A C:\Users\Admin\AppData\Local\Temp\f05a9ea1aa0a3f710c58366adf8c58ee9525537cbf2f621f753bd4a1ff5db8f3.exe C:\Windows\Microsoft.NET\Framework\v4.0.30319\MSBuild.exe
PID 2492 wrote to memory of 4988 N/A C:\Windows\Microsoft.NET\Framework\v4.0.30319\MSBuild.exe C:\Users\Admin\AppData\Roaming\MSBuild.exe
PID 2492 wrote to memory of 4988 N/A C:\Windows\Microsoft.NET\Framework\v4.0.30319\MSBuild.exe C:\Users\Admin\AppData\Roaming\MSBuild.exe
PID 2492 wrote to memory of 4988 N/A C:\Windows\Microsoft.NET\Framework\v4.0.30319\MSBuild.exe C:\Users\Admin\AppData\Roaming\MSBuild.exe

Processes

C:\Users\Admin\AppData\Local\Temp\f05a9ea1aa0a3f710c58366adf8c58ee9525537cbf2f621f753bd4a1ff5db8f3.exe

"C:\Users\Admin\AppData\Local\Temp\f05a9ea1aa0a3f710c58366adf8c58ee9525537cbf2f621f753bd4a1ff5db8f3.exe"

C:\Windows\Microsoft.NET\Framework\v4.0.30319\MSBuild.exe

#by-unknown

C:\Windows\Microsoft.NET\Framework\v4.0.30319\MSBuild.exe

#by-unknown

C:\Users\Admin\AppData\Roaming\MSBuild.exe

"C:\Users\Admin\AppData\Roaming\MSBuild.exe"

Network

Country Destination Domain Proto
US 8.8.8.8:53 209.205.72.20.in-addr.arpa udp
US 8.8.8.8:53 133.32.126.40.in-addr.arpa udp
US 8.8.8.8:53 95.221.229.192.in-addr.arpa udp
US 8.8.8.8:53 88.156.103.20.in-addr.arpa udp
US 8.8.8.8:53 228.249.119.40.in-addr.arpa udp
US 8.8.8.8:53 154.239.44.20.in-addr.arpa udp
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 0.205.248.87.in-addr.arpa udp
US 8.8.8.8:53 73.144.22.2.in-addr.arpa udp
US 8.8.8.8:53 55.36.223.20.in-addr.arpa udp
US 8.8.8.8:53 19.229.111.52.in-addr.arpa udp
US 8.8.8.8:53 tse1.mm.bing.net udp
US 150.171.27.10:443 tse1.mm.bing.net tcp
US 150.171.27.10:443 tse1.mm.bing.net tcp
US 150.171.27.10:443 tse1.mm.bing.net tcp
US 150.171.27.10:443 tse1.mm.bing.net tcp
US 150.171.27.10:443 tse1.mm.bing.net tcp
US 8.8.8.8:53 10.27.171.150.in-addr.arpa udp

Files

memory/4444-0-0x0000000074FCE000-0x0000000074FCF000-memory.dmp

memory/4444-1-0x0000000000700000-0x0000000000748000-memory.dmp

memory/2492-2-0x0000000000400000-0x0000000000422000-memory.dmp

memory/4444-4-0x0000000074FC0000-0x0000000075770000-memory.dmp

memory/2492-5-0x0000000074FC0000-0x0000000075770000-memory.dmp

memory/4444-6-0x0000000074FC0000-0x0000000075770000-memory.dmp

memory/2492-7-0x0000000005F60000-0x0000000006504000-memory.dmp

memory/2492-8-0x00000000058B0000-0x0000000005942000-memory.dmp

memory/2492-9-0x0000000074FC0000-0x0000000075770000-memory.dmp

memory/2492-10-0x0000000005970000-0x000000000597A000-memory.dmp

C:\Users\Admin\AppData\Roaming\MSBuild.exe

MD5 8fdf47e0ff70c40ed3a17014aeea4232
SHA1 e6256a0159688f0560b015da4d967f41cbf8c9bd
SHA256 ed9884bac608c06b7057037cc91d90e4ae5f74dd2dbce2af476699c6d4492d82
SHA512 bd69d092ed4f9c5e1f24eaf5ec79fb316469d53849dc798fae0fcba5e90869b77ee924c23cc6f692198ff25827ab60ad47bb46cadd6e0aadde7731cbafb013be

memory/2492-21-0x0000000074FC0000-0x0000000075770000-memory.dmp

memory/4988-23-0x0000000074F90000-0x000000007503B000-memory.dmp

memory/4988-25-0x0000000002E60000-0x0000000002E7A000-memory.dmp

memory/4988-26-0x00000000054B0000-0x000000000560A000-memory.dmp

memory/4988-24-0x0000000000AD0000-0x0000000000B10000-memory.dmp

memory/4988-28-0x0000000074F90000-0x000000007503B000-memory.dmp

Analysis: behavioral1

Detonation Overview

Submitted

2024-08-10 13:46

Reported

2024-08-10 13:48

Platform

win7-20240705-en

Max time kernel

118s

Max time network

119s

Command Line

"C:\Users\Admin\AppData\Local\Temp\f05a9ea1aa0a3f710c58366adf8c58ee9525537cbf2f621f753bd4a1ff5db8f3.exe"

Signatures

VanillaRat

rat vanillarat

Vanilla Rat payload

rat
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

Executes dropped EXE

Description Indicator Process Target
N/A N/A C:\Users\Admin\AppData\Roaming\MSBuild.exe N/A

Loads dropped DLL

Description Indicator Process Target
N/A N/A C:\Windows\Microsoft.NET\Framework\v4.0.30319\MSBuild.exe N/A

Suspicious use of SetThreadContext

Description Indicator Process Target
PID 1904 set thread context of 2020 N/A C:\Users\Admin\AppData\Local\Temp\f05a9ea1aa0a3f710c58366adf8c58ee9525537cbf2f621f753bd4a1ff5db8f3.exe C:\Windows\Microsoft.NET\Framework\v4.0.30319\MSBuild.exe

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\f05a9ea1aa0a3f710c58366adf8c58ee9525537cbf2f621f753bd4a1ff5db8f3.exe N/A
Key opened \REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language C:\Windows\Microsoft.NET\Framework\v4.0.30319\MSBuild.exe N/A
Key opened \REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language C:\Users\Admin\AppData\Roaming\MSBuild.exe N/A

Suspicious use of AdjustPrivilegeToken

Description Indicator Process Target
Token: SeDebugPrivilege N/A C:\Windows\Microsoft.NET\Framework\v4.0.30319\MSBuild.exe N/A

Suspicious use of WriteProcessMemory

Description Indicator Process Target
PID 1904 wrote to memory of 2020 N/A C:\Users\Admin\AppData\Local\Temp\f05a9ea1aa0a3f710c58366adf8c58ee9525537cbf2f621f753bd4a1ff5db8f3.exe C:\Windows\Microsoft.NET\Framework\v4.0.30319\MSBuild.exe
PID 1904 wrote to memory of 2020 N/A C:\Users\Admin\AppData\Local\Temp\f05a9ea1aa0a3f710c58366adf8c58ee9525537cbf2f621f753bd4a1ff5db8f3.exe C:\Windows\Microsoft.NET\Framework\v4.0.30319\MSBuild.exe
PID 1904 wrote to memory of 2020 N/A C:\Users\Admin\AppData\Local\Temp\f05a9ea1aa0a3f710c58366adf8c58ee9525537cbf2f621f753bd4a1ff5db8f3.exe C:\Windows\Microsoft.NET\Framework\v4.0.30319\MSBuild.exe
PID 1904 wrote to memory of 2020 N/A C:\Users\Admin\AppData\Local\Temp\f05a9ea1aa0a3f710c58366adf8c58ee9525537cbf2f621f753bd4a1ff5db8f3.exe C:\Windows\Microsoft.NET\Framework\v4.0.30319\MSBuild.exe
PID 1904 wrote to memory of 2020 N/A C:\Users\Admin\AppData\Local\Temp\f05a9ea1aa0a3f710c58366adf8c58ee9525537cbf2f621f753bd4a1ff5db8f3.exe C:\Windows\Microsoft.NET\Framework\v4.0.30319\MSBuild.exe
PID 1904 wrote to memory of 2020 N/A C:\Users\Admin\AppData\Local\Temp\f05a9ea1aa0a3f710c58366adf8c58ee9525537cbf2f621f753bd4a1ff5db8f3.exe C:\Windows\Microsoft.NET\Framework\v4.0.30319\MSBuild.exe
PID 1904 wrote to memory of 2020 N/A C:\Users\Admin\AppData\Local\Temp\f05a9ea1aa0a3f710c58366adf8c58ee9525537cbf2f621f753bd4a1ff5db8f3.exe C:\Windows\Microsoft.NET\Framework\v4.0.30319\MSBuild.exe
PID 1904 wrote to memory of 2020 N/A C:\Users\Admin\AppData\Local\Temp\f05a9ea1aa0a3f710c58366adf8c58ee9525537cbf2f621f753bd4a1ff5db8f3.exe C:\Windows\Microsoft.NET\Framework\v4.0.30319\MSBuild.exe
PID 1904 wrote to memory of 2020 N/A C:\Users\Admin\AppData\Local\Temp\f05a9ea1aa0a3f710c58366adf8c58ee9525537cbf2f621f753bd4a1ff5db8f3.exe C:\Windows\Microsoft.NET\Framework\v4.0.30319\MSBuild.exe
PID 2020 wrote to memory of 2660 N/A C:\Windows\Microsoft.NET\Framework\v4.0.30319\MSBuild.exe C:\Users\Admin\AppData\Roaming\MSBuild.exe
PID 2020 wrote to memory of 2660 N/A C:\Windows\Microsoft.NET\Framework\v4.0.30319\MSBuild.exe C:\Users\Admin\AppData\Roaming\MSBuild.exe
PID 2020 wrote to memory of 2660 N/A C:\Windows\Microsoft.NET\Framework\v4.0.30319\MSBuild.exe C:\Users\Admin\AppData\Roaming\MSBuild.exe
PID 2020 wrote to memory of 2660 N/A C:\Windows\Microsoft.NET\Framework\v4.0.30319\MSBuild.exe C:\Users\Admin\AppData\Roaming\MSBuild.exe

Processes

C:\Users\Admin\AppData\Local\Temp\f05a9ea1aa0a3f710c58366adf8c58ee9525537cbf2f621f753bd4a1ff5db8f3.exe

"C:\Users\Admin\AppData\Local\Temp\f05a9ea1aa0a3f710c58366adf8c58ee9525537cbf2f621f753bd4a1ff5db8f3.exe"

C:\Windows\Microsoft.NET\Framework\v4.0.30319\MSBuild.exe

#by-unknown

C:\Users\Admin\AppData\Roaming\MSBuild.exe

"C:\Users\Admin\AppData\Roaming\MSBuild.exe"

Network

N/A

Files

memory/1904-0-0x0000000074CEE000-0x0000000074CEF000-memory.dmp

memory/1904-1-0x0000000000040000-0x0000000000088000-memory.dmp

memory/1904-2-0x0000000074CE0000-0x00000000753CE000-memory.dmp

memory/2020-8-0x0000000000400000-0x0000000000422000-memory.dmp

memory/2020-12-0x0000000000400000-0x0000000000422000-memory.dmp

memory/1904-13-0x0000000074CE0000-0x00000000753CE000-memory.dmp

memory/2020-10-0x0000000000400000-0x0000000000422000-memory.dmp

memory/2020-7-0x00000000FFFDE000-0x00000000FFFDF000-memory.dmp

memory/2020-6-0x0000000000400000-0x0000000000422000-memory.dmp

memory/2020-5-0x0000000000400000-0x0000000000422000-memory.dmp

memory/2020-4-0x0000000000400000-0x0000000000422000-memory.dmp

memory/2020-3-0x0000000000400000-0x0000000000422000-memory.dmp

memory/2020-14-0x0000000074CE0000-0x00000000753CE000-memory.dmp

memory/2020-15-0x0000000074CE0000-0x00000000753CE000-memory.dmp

\Users\Admin\AppData\Roaming\MSBuild.exe

MD5 9af17c8393f0970ee5136bd3ffa27001
SHA1 4b285b72c1a11285a25f31f2597e090da6bbc049
SHA256 71d6a7a3fe5f8dc878cd5bdeca0e09177efb85c01e9a8a10a95262cabefaa019
SHA512 b90f7de7d5ce72dccb264c7ba609e173c529b9d99ed9a63f88632bc58b1a994bbb727365f519c73b979f8918bd6de3c39a9f0347eb3a4bccdce4b2772a6516a3

memory/2020-24-0x0000000074CE0000-0x00000000753CE000-memory.dmp

memory/2660-23-0x0000000000EF0000-0x0000000000F30000-memory.dmp