Malware Analysis Report

2024-09-22 21:49

Sample ID 240204-s1s47afcdq
Target 8f84a3ca662fe5a89a35c32df3db77d4
SHA256 e964f339c6a7e1119c7992a08e4db2cc5cf987d83019142afce62f60285e31b2
Tags
oski infostealer
score
10/10

Table of Contents

Analysis Overview

MITRE ATT&CK Matrix

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

e964f339c6a7e1119c7992a08e4db2cc5cf987d83019142afce62f60285e31b2

Threat Level: Known bad

The file 8f84a3ca662fe5a89a35c32df3db77d4 was found to be: Known bad.

Malicious Activity Summary

oski infostealer

Oski

Suspicious use of SetThreadContext

Suspicious use of AdjustPrivilegeToken

Suspicious use of WriteProcessMemory

Suspicious behavior: EnumeratesProcesses

MITRE ATT&CK Matrix

N/A

Analysis: static1

Detonation Overview

Reported

2024-02-04 15:35

Signatures

N/A

Analysis: behavioral1

Detonation Overview

Submitted

2024-02-04 15:35

Reported

2024-02-04 15:38

Platform

win7-20231215-en

Max time kernel

117s

Max time network

121s

Command Line

powershell.exe -ExecutionPolicy bypass -File C:\Users\Admin\AppData\Local\Temp\8f84a3ca662fe5a89a35c32df3db77d4.ps1

Signatures

Suspicious behavior: EnumeratesProcesses

Description Indicator Process Target
N/A N/A C:\Windows\System32\WindowsPowerShell\v1.0\powershell.exe N/A

Suspicious use of AdjustPrivilegeToken

Description Indicator Process Target
Token: SeDebugPrivilege N/A C:\Windows\System32\WindowsPowerShell\v1.0\powershell.exe N/A

Processes

C:\Windows\System32\WindowsPowerShell\v1.0\powershell.exe

powershell.exe -ExecutionPolicy bypass -File C:\Users\Admin\AppData\Local\Temp\8f84a3ca662fe5a89a35c32df3db77d4.ps1

Network

N/A

Files

memory/2348-4-0x000000001B320000-0x000000001B602000-memory.dmp

memory/2348-6-0x000007FEF5490000-0x000007FEF5E2D000-memory.dmp

memory/2348-7-0x0000000002740000-0x00000000027C0000-memory.dmp

memory/2348-5-0x0000000001ED0000-0x0000000001ED8000-memory.dmp

memory/2348-8-0x000007FEF5490000-0x000007FEF5E2D000-memory.dmp

memory/2348-9-0x0000000002740000-0x00000000027C0000-memory.dmp

memory/2348-10-0x0000000002740000-0x00000000027C0000-memory.dmp

memory/2348-11-0x0000000002740000-0x00000000027C0000-memory.dmp

memory/2348-12-0x0000000002740000-0x00000000027C0000-memory.dmp

memory/2348-13-0x000007FEF5490000-0x000007FEF5E2D000-memory.dmp

Analysis: behavioral2

Detonation Overview

Submitted

2024-02-04 15:35

Reported

2024-02-04 15:38

Platform

win10v2004-20231215-en

Max time kernel

141s

Max time network

149s

Command Line

powershell.exe -ExecutionPolicy bypass -File C:\Users\Admin\AppData\Local\Temp\8f84a3ca662fe5a89a35c32df3db77d4.ps1

Signatures

Oski

infostealer oski

Suspicious use of SetThreadContext

Description Indicator Process Target
PID 996 set thread context of 2424 N/A C:\Windows\System32\WindowsPowerShell\v1.0\powershell.exe C:\Windows\Microsoft.NET\Framework\v4.0.30319\aspnet_compiler.exe

Suspicious behavior: EnumeratesProcesses

Description Indicator Process Target
N/A N/A C:\Windows\System32\WindowsPowerShell\v1.0\powershell.exe N/A
N/A N/A C:\Windows\System32\WindowsPowerShell\v1.0\powershell.exe N/A

Suspicious use of AdjustPrivilegeToken

Description Indicator Process Target
Token: SeDebugPrivilege N/A C:\Windows\System32\WindowsPowerShell\v1.0\powershell.exe N/A

Suspicious use of WriteProcessMemory

Description Indicator Process Target
PID 996 wrote to memory of 2424 N/A C:\Windows\System32\WindowsPowerShell\v1.0\powershell.exe C:\Windows\Microsoft.NET\Framework\v4.0.30319\aspnet_compiler.exe
PID 996 wrote to memory of 2424 N/A C:\Windows\System32\WindowsPowerShell\v1.0\powershell.exe C:\Windows\Microsoft.NET\Framework\v4.0.30319\aspnet_compiler.exe
PID 996 wrote to memory of 2424 N/A C:\Windows\System32\WindowsPowerShell\v1.0\powershell.exe C:\Windows\Microsoft.NET\Framework\v4.0.30319\aspnet_compiler.exe
PID 996 wrote to memory of 2424 N/A C:\Windows\System32\WindowsPowerShell\v1.0\powershell.exe C:\Windows\Microsoft.NET\Framework\v4.0.30319\aspnet_compiler.exe
PID 996 wrote to memory of 2424 N/A C:\Windows\System32\WindowsPowerShell\v1.0\powershell.exe C:\Windows\Microsoft.NET\Framework\v4.0.30319\aspnet_compiler.exe
PID 996 wrote to memory of 2424 N/A C:\Windows\System32\WindowsPowerShell\v1.0\powershell.exe C:\Windows\Microsoft.NET\Framework\v4.0.30319\aspnet_compiler.exe
PID 996 wrote to memory of 2424 N/A C:\Windows\System32\WindowsPowerShell\v1.0\powershell.exe C:\Windows\Microsoft.NET\Framework\v4.0.30319\aspnet_compiler.exe
PID 996 wrote to memory of 2424 N/A C:\Windows\System32\WindowsPowerShell\v1.0\powershell.exe C:\Windows\Microsoft.NET\Framework\v4.0.30319\aspnet_compiler.exe
PID 996 wrote to memory of 2424 N/A C:\Windows\System32\WindowsPowerShell\v1.0\powershell.exe C:\Windows\Microsoft.NET\Framework\v4.0.30319\aspnet_compiler.exe

Processes

C:\Windows\System32\WindowsPowerShell\v1.0\powershell.exe

powershell.exe -ExecutionPolicy bypass -File C:\Users\Admin\AppData\Local\Temp\8f84a3ca662fe5a89a35c32df3db77d4.ps1

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

#cmd

Network

Country Destination Domain Proto
NL 52.142.223.178:80 tcp
US 8.8.8.8:53 97.17.167.52.in-addr.arpa udp
VN 103.114.107.28:80 tcp
US 8.8.8.8:53 204.178.17.96.in-addr.arpa udp
US 8.8.8.8:53 76.32.126.40.in-addr.arpa udp
US 8.8.8.8:53 95.221.229.192.in-addr.arpa udp
VN 103.114.107.28:80 tcp
US 8.8.8.8:53 26.165.165.52.in-addr.arpa udp
US 8.8.8.8:53 18.31.95.13.in-addr.arpa udp
US 8.8.8.8:53 18.134.221.88.in-addr.arpa udp
VN 103.114.107.28:80 tcp
US 8.8.8.8:53 210.178.17.96.in-addr.arpa udp
VN 103.114.107.28:80 tcp
US 8.8.8.8:53 14.227.111.52.in-addr.arpa udp
VN 103.114.107.28:80 tcp
US 8.8.8.8:53 178.178.17.96.in-addr.arpa udp
VN 103.114.107.28:80 tcp
VN 103.114.107.28:80 tcp
US 8.8.8.8:53 169.117.168.52.in-addr.arpa udp

Files

memory/996-5-0x00000225835F0000-0x0000022583612000-memory.dmp

C:\Users\Admin\AppData\Local\Temp\__PSScriptPolicyTest_5qwcx3m3.urk.ps1

MD5 d17fe0a3f47be24a6453e9ef58c94641
SHA1 6ab83620379fc69f80c0242105ddffd7d98d5d9d
SHA256 96ad1146eb96877eab5942ae0736b82d8b5e2039a80d3d6932665c1a4c87dcf7
SHA512 5b592e58f26c264604f98f6aa12860758ce606d1c63220736cf0c779e4e18e3cec8706930a16c38b20161754d1017d1657d35258e58ca22b18f5b232880dec82

memory/996-12-0x000002259BAC0000-0x000002259BAD0000-memory.dmp

memory/996-11-0x000002259BAC0000-0x000002259BAD0000-memory.dmp

memory/996-10-0x00007FFDA9E50000-0x00007FFDAA911000-memory.dmp

memory/996-13-0x000002259BAA0000-0x000002259BAC6000-memory.dmp

memory/996-14-0x000002259BAA0000-0x000002259BAC0000-memory.dmp

memory/996-15-0x000002259BAA0000-0x000002259BAC0000-memory.dmp

memory/996-17-0x000002259BAA0000-0x000002259BAC0000-memory.dmp

memory/996-19-0x000002259BAA0000-0x000002259BAC0000-memory.dmp

memory/996-25-0x000002259BAA0000-0x000002259BAC0000-memory.dmp

memory/996-23-0x000002259BAA0000-0x000002259BAC0000-memory.dmp

memory/996-21-0x000002259BAA0000-0x000002259BAC0000-memory.dmp

memory/996-29-0x000002259BAA0000-0x000002259BAC0000-memory.dmp

memory/996-37-0x000002259BAA0000-0x000002259BAC0000-memory.dmp

memory/996-39-0x000002259BAA0000-0x000002259BAC0000-memory.dmp

memory/996-49-0x000002259BAA0000-0x000002259BAC0000-memory.dmp

memory/996-51-0x000002259BAA0000-0x000002259BAC0000-memory.dmp

memory/996-53-0x000002259BAA0000-0x000002259BAC0000-memory.dmp

memory/996-47-0x000002259BAA0000-0x000002259BAC0000-memory.dmp

memory/996-45-0x000002259BAA0000-0x000002259BAC0000-memory.dmp

memory/2424-55-0x0000000000400000-0x0000000000438000-memory.dmp

memory/996-54-0x0000022583640000-0x0000022583641000-memory.dmp

memory/2424-58-0x0000000000400000-0x0000000000438000-memory.dmp

memory/996-43-0x000002259BAA0000-0x000002259BAC0000-memory.dmp

memory/996-41-0x000002259BAA0000-0x000002259BAC0000-memory.dmp

memory/996-35-0x000002259BAA0000-0x000002259BAC0000-memory.dmp

memory/996-33-0x000002259BAA0000-0x000002259BAC0000-memory.dmp

memory/2424-59-0x0000000000400000-0x0000000000438000-memory.dmp

memory/996-31-0x000002259BAA0000-0x000002259BAC0000-memory.dmp

memory/996-60-0x00007FFDA9E50000-0x00007FFDAA911000-memory.dmp

memory/996-27-0x000002259BAA0000-0x000002259BAC0000-memory.dmp

memory/2424-61-0x0000000000400000-0x0000000000438000-memory.dmp

memory/2424-62-0x0000000000400000-0x0000000000438000-memory.dmp