Malware Analysis Report

2024-09-22 21:45

Sample ID 240228-y6tkssch3s
Target acc4fdc0e6c701455ee76253ebf158b1
SHA256 8b0ac881b039733c573ab30cf037e0ce3d6f2981c0eb2342902b91ecf891adff
Tags
oski infostealer spyware stealer
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

8b0ac881b039733c573ab30cf037e0ce3d6f2981c0eb2342902b91ecf891adff

Threat Level: Known bad

The file acc4fdc0e6c701455ee76253ebf158b1 was found to be: Known bad.

Malicious Activity Summary

oski infostealer spyware stealer

Oski

Checks computer location settings

Reads user/profile data of web browsers

Suspicious use of SetThreadContext

Program crash

Enumerates physical storage devices

Unsigned PE

Suspicious use of AdjustPrivilegeToken

Creates scheduled task(s)

Suspicious behavior: EnumeratesProcesses

Suspicious use of WriteProcessMemory

MITRE ATT&CK Matrix V13

Analysis: static1

Detonation Overview

Reported

2024-02-28 20:24

Signatures

Unsigned PE

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

Analysis: behavioral1

Detonation Overview

Submitted

2024-02-28 20:24

Reported

2024-02-28 20:26

Platform

win7-20240221-en

Max time kernel

121s

Max time network

124s

Command Line

"C:\Users\Admin\AppData\Local\Temp\SKBM-120821.exe"

Signatures

Oski

infostealer oski

Suspicious use of SetThreadContext

Description Indicator Process Target
PID 2176 set thread context of 2420 N/A C:\Users\Admin\AppData\Local\Temp\SKBM-120821.exe C:\Users\Admin\AppData\Local\Temp\SKBM-120821.exe

Enumerates physical storage devices

Program crash

Description Indicator Process Target
N/A N/A C:\Windows\SysWOW64\WerFault.exe C:\Users\Admin\AppData\Local\Temp\SKBM-120821.exe

Creates scheduled task(s)

persistence
Description Indicator Process Target
N/A N/A C:\Windows\SysWOW64\schtasks.exe N/A

Suspicious behavior: EnumeratesProcesses

Description Indicator Process Target
N/A N/A C:\Users\Admin\AppData\Local\Temp\SKBM-120821.exe N/A

Suspicious use of AdjustPrivilegeToken

Description Indicator Process Target
Token: SeDebugPrivilege N/A C:\Users\Admin\AppData\Local\Temp\SKBM-120821.exe N/A

Suspicious use of WriteProcessMemory

Description Indicator Process Target
PID 2176 wrote to memory of 2260 N/A C:\Users\Admin\AppData\Local\Temp\SKBM-120821.exe C:\Windows\SysWOW64\schtasks.exe
PID 2176 wrote to memory of 2260 N/A C:\Users\Admin\AppData\Local\Temp\SKBM-120821.exe C:\Windows\SysWOW64\schtasks.exe
PID 2176 wrote to memory of 2260 N/A C:\Users\Admin\AppData\Local\Temp\SKBM-120821.exe C:\Windows\SysWOW64\schtasks.exe
PID 2176 wrote to memory of 2260 N/A C:\Users\Admin\AppData\Local\Temp\SKBM-120821.exe C:\Windows\SysWOW64\schtasks.exe
PID 2176 wrote to memory of 2420 N/A C:\Users\Admin\AppData\Local\Temp\SKBM-120821.exe C:\Users\Admin\AppData\Local\Temp\SKBM-120821.exe
PID 2176 wrote to memory of 2420 N/A C:\Users\Admin\AppData\Local\Temp\SKBM-120821.exe C:\Users\Admin\AppData\Local\Temp\SKBM-120821.exe
PID 2176 wrote to memory of 2420 N/A C:\Users\Admin\AppData\Local\Temp\SKBM-120821.exe C:\Users\Admin\AppData\Local\Temp\SKBM-120821.exe
PID 2176 wrote to memory of 2420 N/A C:\Users\Admin\AppData\Local\Temp\SKBM-120821.exe C:\Users\Admin\AppData\Local\Temp\SKBM-120821.exe
PID 2176 wrote to memory of 2420 N/A C:\Users\Admin\AppData\Local\Temp\SKBM-120821.exe C:\Users\Admin\AppData\Local\Temp\SKBM-120821.exe
PID 2176 wrote to memory of 2420 N/A C:\Users\Admin\AppData\Local\Temp\SKBM-120821.exe C:\Users\Admin\AppData\Local\Temp\SKBM-120821.exe
PID 2176 wrote to memory of 2420 N/A C:\Users\Admin\AppData\Local\Temp\SKBM-120821.exe C:\Users\Admin\AppData\Local\Temp\SKBM-120821.exe
PID 2176 wrote to memory of 2420 N/A C:\Users\Admin\AppData\Local\Temp\SKBM-120821.exe C:\Users\Admin\AppData\Local\Temp\SKBM-120821.exe
PID 2176 wrote to memory of 2420 N/A C:\Users\Admin\AppData\Local\Temp\SKBM-120821.exe C:\Users\Admin\AppData\Local\Temp\SKBM-120821.exe
PID 2176 wrote to memory of 2420 N/A C:\Users\Admin\AppData\Local\Temp\SKBM-120821.exe C:\Users\Admin\AppData\Local\Temp\SKBM-120821.exe
PID 2420 wrote to memory of 2408 N/A C:\Users\Admin\AppData\Local\Temp\SKBM-120821.exe C:\Windows\SysWOW64\WerFault.exe
PID 2420 wrote to memory of 2408 N/A C:\Users\Admin\AppData\Local\Temp\SKBM-120821.exe C:\Windows\SysWOW64\WerFault.exe
PID 2420 wrote to memory of 2408 N/A C:\Users\Admin\AppData\Local\Temp\SKBM-120821.exe C:\Windows\SysWOW64\WerFault.exe
PID 2420 wrote to memory of 2408 N/A C:\Users\Admin\AppData\Local\Temp\SKBM-120821.exe C:\Windows\SysWOW64\WerFault.exe

Processes

C:\Users\Admin\AppData\Local\Temp\SKBM-120821.exe

"C:\Users\Admin\AppData\Local\Temp\SKBM-120821.exe"

C:\Windows\SysWOW64\schtasks.exe

"C:\Windows\System32\schtasks.exe" /Create /TN "Updates\rFmqUFUNsPfqc" /XML "C:\Users\Admin\AppData\Local\Temp\tmpC6D8.tmp"

C:\Users\Admin\AppData\Local\Temp\SKBM-120821.exe

"{path}"

C:\Windows\SysWOW64\WerFault.exe

C:\Windows\SysWOW64\WerFault.exe -u -p 2420 -s 112

Network

N/A

Files

memory/2176-1-0x0000000073FA0000-0x000000007468E000-memory.dmp

memory/2176-0-0x0000000001180000-0x000000000123C000-memory.dmp

memory/2176-2-0x0000000004CB0000-0x0000000004CF0000-memory.dmp

memory/2176-3-0x0000000000440000-0x0000000000448000-memory.dmp

memory/2176-4-0x0000000073FA0000-0x000000007468E000-memory.dmp

memory/2176-5-0x0000000004CB0000-0x0000000004CF0000-memory.dmp

memory/2176-6-0x0000000005130000-0x00000000051B2000-memory.dmp

memory/2176-7-0x0000000000B90000-0x0000000000BCC000-memory.dmp

C:\Users\Admin\AppData\Local\Temp\tmpC6D8.tmp

MD5 dc997eccbf233ce4494baa204211c389
SHA1 66a86a2e34e68214faa68926f888fdee447dc951
SHA256 46893f6b7ad046a5ff41d2ba1c208314bfc1b5a52e55289e91f12aa7cf657fe7
SHA512 1b25d03350961170d8455c5556e7c8a5408dba748902038630b6760917daa0b71a5d8768a3796d1d2ae0ebb8aa7e6841a4ea21c047e248fe93ffdf7bc3d1b3d6

memory/2420-11-0x0000000000400000-0x0000000000438000-memory.dmp

memory/2420-12-0x0000000000400000-0x0000000000438000-memory.dmp

memory/2420-14-0x0000000000400000-0x0000000000438000-memory.dmp

memory/2420-13-0x0000000000400000-0x0000000000438000-memory.dmp

memory/2420-16-0x0000000000400000-0x0000000000438000-memory.dmp

memory/2420-17-0x000000007EFDE000-0x000000007EFDF000-memory.dmp

memory/2420-19-0x0000000000400000-0x0000000000438000-memory.dmp

memory/2420-21-0x0000000000400000-0x0000000000438000-memory.dmp

memory/2176-22-0x0000000073FA0000-0x000000007468E000-memory.dmp

Analysis: behavioral2

Detonation Overview

Submitted

2024-02-28 20:24

Reported

2024-02-28 20:26

Platform

win10v2004-20240226-en

Max time kernel

144s

Max time network

153s

Command Line

"C:\Users\Admin\AppData\Local\Temp\SKBM-120821.exe"

Signatures

Oski

infostealer oski

Checks computer location settings

Description Indicator Process Target
Key value queried \REGISTRY\USER\S-1-5-21-3808065738-1666277613-1125846146-1000\Control Panel\International\Geo\Nation C:\Users\Admin\AppData\Local\Temp\SKBM-120821.exe N/A

Reads user/profile data of web browsers

spyware stealer

Suspicious use of SetThreadContext

Description Indicator Process Target
PID 3968 set thread context of 4304 N/A C:\Users\Admin\AppData\Local\Temp\SKBM-120821.exe C:\Users\Admin\AppData\Local\Temp\SKBM-120821.exe

Enumerates physical storage devices

Program crash

Description Indicator Process Target
N/A N/A C:\Windows\SysWOW64\WerFault.exe C:\Users\Admin\AppData\Local\Temp\SKBM-120821.exe

Creates scheduled task(s)

persistence
Description Indicator Process Target
N/A N/A C:\Windows\SysWOW64\schtasks.exe N/A

Suspicious behavior: EnumeratesProcesses

Description Indicator Process Target
N/A N/A C:\Users\Admin\AppData\Local\Temp\SKBM-120821.exe N/A
N/A N/A C:\Users\Admin\AppData\Local\Temp\SKBM-120821.exe N/A

Suspicious use of AdjustPrivilegeToken

Description Indicator Process Target
Token: SeDebugPrivilege N/A C:\Users\Admin\AppData\Local\Temp\SKBM-120821.exe N/A

Suspicious use of WriteProcessMemory

Description Indicator Process Target
PID 3968 wrote to memory of 1536 N/A C:\Users\Admin\AppData\Local\Temp\SKBM-120821.exe C:\Windows\SysWOW64\schtasks.exe
PID 3968 wrote to memory of 1536 N/A C:\Users\Admin\AppData\Local\Temp\SKBM-120821.exe C:\Windows\SysWOW64\schtasks.exe
PID 3968 wrote to memory of 1536 N/A C:\Users\Admin\AppData\Local\Temp\SKBM-120821.exe C:\Windows\SysWOW64\schtasks.exe
PID 3968 wrote to memory of 4304 N/A C:\Users\Admin\AppData\Local\Temp\SKBM-120821.exe C:\Users\Admin\AppData\Local\Temp\SKBM-120821.exe
PID 3968 wrote to memory of 4304 N/A C:\Users\Admin\AppData\Local\Temp\SKBM-120821.exe C:\Users\Admin\AppData\Local\Temp\SKBM-120821.exe
PID 3968 wrote to memory of 4304 N/A C:\Users\Admin\AppData\Local\Temp\SKBM-120821.exe C:\Users\Admin\AppData\Local\Temp\SKBM-120821.exe
PID 3968 wrote to memory of 4304 N/A C:\Users\Admin\AppData\Local\Temp\SKBM-120821.exe C:\Users\Admin\AppData\Local\Temp\SKBM-120821.exe
PID 3968 wrote to memory of 4304 N/A C:\Users\Admin\AppData\Local\Temp\SKBM-120821.exe C:\Users\Admin\AppData\Local\Temp\SKBM-120821.exe
PID 3968 wrote to memory of 4304 N/A C:\Users\Admin\AppData\Local\Temp\SKBM-120821.exe C:\Users\Admin\AppData\Local\Temp\SKBM-120821.exe
PID 3968 wrote to memory of 4304 N/A C:\Users\Admin\AppData\Local\Temp\SKBM-120821.exe C:\Users\Admin\AppData\Local\Temp\SKBM-120821.exe
PID 3968 wrote to memory of 4304 N/A C:\Users\Admin\AppData\Local\Temp\SKBM-120821.exe C:\Users\Admin\AppData\Local\Temp\SKBM-120821.exe
PID 3968 wrote to memory of 4304 N/A C:\Users\Admin\AppData\Local\Temp\SKBM-120821.exe C:\Users\Admin\AppData\Local\Temp\SKBM-120821.exe

Processes

C:\Users\Admin\AppData\Local\Temp\SKBM-120821.exe

"C:\Users\Admin\AppData\Local\Temp\SKBM-120821.exe"

C:\Program Files (x86)\Microsoft\Edge\Application\msedge.exe

"C:\Program Files (x86)\Microsoft\Edge\Application\msedge.exe" --type=utility --utility-sub-type=asset_store.mojom.AssetStoreService --lang=en-US --service-sandbox-type=asset_store_service --no-appcompat-clear --mojo-platform-channel-handle=1340 --field-trial-handle=2292,i,2103142837140538807,15881446839139365070,262144 --variations-seed-version /prefetch:8

C:\Windows\SysWOW64\schtasks.exe

"C:\Windows\System32\schtasks.exe" /Create /TN "Updates\rFmqUFUNsPfqc" /XML "C:\Users\Admin\AppData\Local\Temp\tmp64B0.tmp"

C:\Users\Admin\AppData\Local\Temp\SKBM-120821.exe

"{path}"

C:\Windows\SysWOW64\WerFault.exe

C:\Windows\SysWOW64\WerFault.exe -pss -s 436 -p 4304 -ip 4304

C:\Windows\SysWOW64\WerFault.exe

C:\Windows\SysWOW64\WerFault.exe -u -p 4304 -s 1304

Network

Country Destination Domain Proto
US 8.8.8.8:53 186.178.17.96.in-addr.arpa udp
US 8.8.8.8:53 20.160.190.20.in-addr.arpa udp
US 8.8.8.8:53 241.154.82.20.in-addr.arpa udp
US 8.8.8.8:53 g.bing.com udp
US 204.79.197.200:443 g.bing.com tcp
US 8.8.8.8:53 95.221.229.192.in-addr.arpa udp
US 8.8.8.8:53 41.110.16.96.in-addr.arpa udp
US 8.8.8.8:53 200.197.79.204.in-addr.arpa udp
US 8.8.8.8:53 43.58.199.20.in-addr.arpa udp
US 8.8.8.8:53 157.123.68.40.in-addr.arpa udp
US 8.8.8.8:53 56.126.166.20.in-addr.arpa udp
US 8.8.8.8:53 28.160.77.104.in-addr.arpa udp
US 13.107.253.64:443 tcp
US 8.8.8.8:53 zau.divendesign.in udp
US 8.8.8.8:53 189.178.17.96.in-addr.arpa udp
US 8.8.8.8:53 13.227.111.52.in-addr.arpa udp
US 8.8.8.8:53 185.178.17.96.in-addr.arpa udp
US 8.8.8.8:53 chromewebstore.googleapis.com udp
US 8.8.8.8:53 chromewebstore.googleapis.com udp
IE 172.253.116.95:443 chromewebstore.googleapis.com tcp
US 8.8.8.8:53 95.116.253.172.in-addr.arpa udp
US 8.8.8.8:53 16.173.189.20.in-addr.arpa udp

Files

memory/3968-0-0x0000000074DC0000-0x0000000075570000-memory.dmp

memory/3968-1-0x0000000000790000-0x000000000084C000-memory.dmp

memory/3968-2-0x0000000005410000-0x0000000005420000-memory.dmp

memory/3968-3-0x0000000005280000-0x0000000005288000-memory.dmp

memory/3968-4-0x0000000005420000-0x00000000054BC000-memory.dmp

memory/3968-5-0x00000000054C0000-0x0000000005552000-memory.dmp

memory/3968-6-0x0000000074DC0000-0x0000000075570000-memory.dmp

memory/3968-7-0x0000000005410000-0x0000000005420000-memory.dmp

memory/3968-8-0x0000000005C40000-0x0000000005CC2000-memory.dmp

memory/3968-9-0x0000000005B50000-0x0000000005B8C000-memory.dmp

C:\Users\Admin\AppData\Local\Temp\tmp64B0.tmp

MD5 1beb7445d23a4c634a937eaa7cc15026
SHA1 953e765d8ccf852a4c6a6293c289fe380df69d3f
SHA256 ce3bd123d2f11c4ee3a0c94109d982dd4e0c25eda9a2f54b67ef3e2363421895
SHA512 35b3b70778b741bcb9d204ffc83044f9fd75be68cb13b471039eb19579c4ef29965166a8d3573eaf590869c0b37a3f380d152e470024b521c50b1a0b1210ad04

memory/4304-13-0x0000000000400000-0x0000000000438000-memory.dmp

memory/4304-14-0x0000000000400000-0x0000000000438000-memory.dmp

memory/4304-15-0x0000000000400000-0x0000000000438000-memory.dmp

memory/4304-17-0x0000000000400000-0x0000000000438000-memory.dmp

memory/3968-18-0x0000000074DC0000-0x0000000075570000-memory.dmp

memory/4304-21-0x0000000000400000-0x0000000000438000-memory.dmp