Malware Analysis Report

2024-10-18 21:03

Sample ID 231222-aw74faacg4
Target 387ca63a073cf45af288f89a3da3da8c
SHA256 75883ef3a7a7df97423835189c1703dc2271ec1623701599698252b9f2489613
Tags
oski infostealer
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

75883ef3a7a7df97423835189c1703dc2271ec1623701599698252b9f2489613

Threat Level: Known bad

The file 387ca63a073cf45af288f89a3da3da8c was found to be: Known bad.

Malicious Activity Summary

oski infostealer

Oski

Suspicious use of SetThreadContext

Program crash

Suspicious behavior: EnumeratesProcesses

Suspicious use of AdjustPrivilegeToken

Suspicious use of WriteProcessMemory

MITRE ATT&CK

N/A

Analysis: static1

Detonation Overview

Reported

2023-12-22 00:34

Signatures

N/A

Analysis: behavioral1

Detonation Overview

Submitted

2023-12-22 00:34

Reported

2023-12-23 01:53

Platform

win7-20231215-en

Max time kernel

122s

Max time network

126s

Command Line

powershell.exe -ExecutionPolicy bypass -File C:\Users\Admin\AppData\Local\Temp\387ca63a073cf45af288f89a3da3da8c.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\387ca63a073cf45af288f89a3da3da8c.ps1

Network

N/A

Files

memory/1936-4-0x000000001B1D0000-0x000000001B4B2000-memory.dmp

memory/1936-5-0x0000000002490000-0x0000000002498000-memory.dmp

memory/1936-6-0x000007FEF5260000-0x000007FEF5BFD000-memory.dmp

memory/1936-7-0x0000000002600000-0x0000000002680000-memory.dmp

memory/1936-8-0x000007FEF5260000-0x000007FEF5BFD000-memory.dmp

memory/1936-9-0x0000000002600000-0x0000000002680000-memory.dmp

memory/1936-10-0x0000000002600000-0x0000000002680000-memory.dmp

memory/1936-11-0x000007FEF5260000-0x000007FEF5BFD000-memory.dmp

Analysis: behavioral2

Detonation Overview

Submitted

2023-12-22 00:34

Reported

2023-12-23 01:53

Platform

win10v2004-20231222-en

Max time kernel

90s

Max time network

126s

Command Line

powershell.exe -ExecutionPolicy bypass -File C:\Users\Admin\AppData\Local\Temp\387ca63a073cf45af288f89a3da3da8c.ps1

Signatures

Oski

infostealer oski

Suspicious use of SetThreadContext

Description Indicator Process Target
PID 2140 set thread context of 2364 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 2140 wrote to memory of 2364 N/A C:\Windows\System32\WindowsPowerShell\v1.0\powershell.exe C:\Windows\Microsoft.NET\Framework\v4.0.30319\aspnet_compiler.exe
PID 2140 wrote to memory of 2364 N/A C:\Windows\System32\WindowsPowerShell\v1.0\powershell.exe C:\Windows\Microsoft.NET\Framework\v4.0.30319\aspnet_compiler.exe
PID 2140 wrote to memory of 2364 N/A C:\Windows\System32\WindowsPowerShell\v1.0\powershell.exe C:\Windows\Microsoft.NET\Framework\v4.0.30319\aspnet_compiler.exe
PID 2140 wrote to memory of 2364 N/A C:\Windows\System32\WindowsPowerShell\v1.0\powershell.exe C:\Windows\Microsoft.NET\Framework\v4.0.30319\aspnet_compiler.exe
PID 2140 wrote to memory of 2364 N/A C:\Windows\System32\WindowsPowerShell\v1.0\powershell.exe C:\Windows\Microsoft.NET\Framework\v4.0.30319\aspnet_compiler.exe
PID 2140 wrote to memory of 2364 N/A C:\Windows\System32\WindowsPowerShell\v1.0\powershell.exe C:\Windows\Microsoft.NET\Framework\v4.0.30319\aspnet_compiler.exe
PID 2140 wrote to memory of 2364 N/A C:\Windows\System32\WindowsPowerShell\v1.0\powershell.exe C:\Windows\Microsoft.NET\Framework\v4.0.30319\aspnet_compiler.exe
PID 2140 wrote to memory of 2364 N/A C:\Windows\System32\WindowsPowerShell\v1.0\powershell.exe C:\Windows\Microsoft.NET\Framework\v4.0.30319\aspnet_compiler.exe
PID 2140 wrote to memory of 2364 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\387ca63a073cf45af288f89a3da3da8c.ps1

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

#cmd

C:\Windows\SysWOW64\WerFault.exe

C:\Windows\SysWOW64\WerFault.exe -pss -s 408 -p 2364 -ip 2364

C:\Windows\SysWOW64\WerFault.exe

C:\Windows\SysWOW64\WerFault.exe -u -p 2364 -s 1044

Network

Country Destination Domain Proto
US 8.8.8.8:53 tse1.mm.bing.net udp
US 204.79.197.200:443 tse1.mm.bing.net tcp
US 8.8.8.8:53 41.110.16.96.in-addr.arpa udp
US 8.8.8.8:53 95.221.229.192.in-addr.arpa udp
US 8.8.8.8:53 84.177.190.20.in-addr.arpa udp
US 8.8.8.8:53 9.228.82.20.in-addr.arpa udp
US 8.8.8.8:53 205.47.74.20.in-addr.arpa udp
US 8.8.8.8:53 240.221.184.93.in-addr.arpa udp
US 8.8.8.8:53 14.227.111.52.in-addr.arpa udp

Files

C:\Users\Admin\AppData\Local\Temp\__PSScriptPolicyTest_ltcqcvw4.5v1.ps1

MD5 d17fe0a3f47be24a6453e9ef58c94641
SHA1 6ab83620379fc69f80c0242105ddffd7d98d5d9d
SHA256 96ad1146eb96877eab5942ae0736b82d8b5e2039a80d3d6932665c1a4c87dcf7
SHA512 5b592e58f26c264604f98f6aa12860758ce606d1c63220736cf0c779e4e18e3cec8706930a16c38b20161754d1017d1657d35258e58ca22b18f5b232880dec82

memory/2140-9-0x000001C0A25A0000-0x000001C0A25C2000-memory.dmp

memory/2140-10-0x00007FFFE9630000-0x00007FFFEA0F1000-memory.dmp

memory/2140-12-0x000001C089D60000-0x000001C089D70000-memory.dmp

memory/2140-11-0x000001C089D60000-0x000001C089D70000-memory.dmp

memory/2140-13-0x000001C0A27D0000-0x000001C0A27F6000-memory.dmp

memory/2140-15-0x000001C0A27D0000-0x000001C0A27F0000-memory.dmp

memory/2140-53-0x000001C0A27D0000-0x000001C0A27F0000-memory.dmp

memory/2364-55-0x0000000000400000-0x0000000000438000-memory.dmp

memory/2364-59-0x0000000000400000-0x0000000000438000-memory.dmp

memory/2364-61-0x0000000000400000-0x0000000000438000-memory.dmp

memory/2140-60-0x00007FFFE9630000-0x00007FFFEA0F1000-memory.dmp

memory/2364-58-0x0000000000400000-0x0000000000438000-memory.dmp

memory/2140-56-0x000001C089D60000-0x000001C089D70000-memory.dmp

memory/2140-54-0x000001C0A27F0000-0x000001C0A27F1000-memory.dmp

memory/2140-51-0x000001C0A27D0000-0x000001C0A27F0000-memory.dmp

memory/2140-49-0x000001C0A27D0000-0x000001C0A27F0000-memory.dmp

memory/2140-47-0x000001C0A27D0000-0x000001C0A27F0000-memory.dmp

memory/2140-45-0x000001C0A27D0000-0x000001C0A27F0000-memory.dmp

memory/2140-43-0x000001C0A27D0000-0x000001C0A27F0000-memory.dmp

memory/2140-41-0x000001C0A27D0000-0x000001C0A27F0000-memory.dmp

memory/2140-39-0x000001C0A27D0000-0x000001C0A27F0000-memory.dmp

memory/2140-37-0x000001C0A27D0000-0x000001C0A27F0000-memory.dmp

memory/2140-35-0x000001C0A27D0000-0x000001C0A27F0000-memory.dmp

memory/2140-33-0x000001C0A27D0000-0x000001C0A27F0000-memory.dmp

memory/2140-31-0x000001C0A27D0000-0x000001C0A27F0000-memory.dmp

memory/2140-29-0x000001C0A27D0000-0x000001C0A27F0000-memory.dmp

memory/2140-27-0x000001C0A27D0000-0x000001C0A27F0000-memory.dmp

memory/2140-25-0x000001C0A27D0000-0x000001C0A27F0000-memory.dmp

memory/2140-23-0x000001C0A27D0000-0x000001C0A27F0000-memory.dmp

memory/2140-21-0x000001C0A27D0000-0x000001C0A27F0000-memory.dmp

memory/2140-19-0x000001C0A27D0000-0x000001C0A27F0000-memory.dmp

memory/2364-64-0x0000000000400000-0x0000000000438000-memory.dmp

memory/2140-17-0x000001C0A27D0000-0x000001C0A27F0000-memory.dmp

memory/2140-14-0x000001C0A27D0000-0x000001C0A27F0000-memory.dmp