oski | 18e2b4fb63b38a0d2441bfa6f2afa3c6494e4f85479505f7d228447720ac0485

General

Target

18e2b4fb63b38a0d2441bfa6f2afa3c6494e4f85479505f7d228447720ac0485.exe
Size

308KB
MD5

be5881faee054826d32c90d47fed53ce
SHA1

25c63bcb8353bd35a4fd28826a5dd959d73379b6
SHA256

18e2b4fb63b38a0d2441bfa6f2afa3c6494e4f85479505f7d228447720ac0485
SHA512

b7d15268a15eec00b1069c391d18406de850334e13653ecd87eb936001d1c02aa10e9f597bd181408f1f232ca212354b01defa5496ce9bfd89a8c9b0c3d881ce
SSDEEP

6144:Bu8bleVTTURmXOu5OX/oX0e2AmSTCIr53qnsAvtgcmXDqWiQJ:M8STTUR6OuCgX0UmS9i16J

Score

10^/10

oski infostealer spyware stealer

Malware Config

Extracted

Family

oski

C2

collegesboard.org

Signatures

Oski
Oski is an infostealer targeting browser data, crypto wallets.
infostealer oski
Executes dropped EXE 2 IoCs

Processes:

Hrwfvhc.exeCzkorfvflbb.exe

pid process

2004 Hrwfvhc.exe
1952 Czkorfvflbb.exe
Loads dropped DLL 3 IoCs

Processes:

WerFault.exe

pid process

1144 WerFault.exe
1144 WerFault.exe
1144 WerFault.exe
Reads user/profile data of web browsers 2 TTPs
Infostealers often target stored browser data, which can include saved credentials etc.
spyware stealer

Data from Local System
T1005

Credentials in Files
T1081
Enumerates physical storage devices 1 TTPs
Attempts to interact with connected storage/optical drive(s). Likely ransomware behaviour.

System Information Discovery
T1082
Program crash 1 IoCs

Processes:

WerFault.exe

pid pid_target process target process

1144 1952 WerFault.exe Czkorfvflbb.exe
Suspicious use of AdjustPrivilegeToken 1 IoCs

Processes:

Hrwfvhc.exe

description pid process

Token: SeDebugPrivilege 2004 Hrwfvhc.exe

pid	process
2004	Hrwfvhc.exe
1952	Czkorfvflbb.exe

pid	process
1144	WerFault.exe
1144	WerFault.exe
1144	WerFault.exe

pid	pid_target	process	target process
1144	1952	WerFault.exe	Czkorfvflbb.exe

description	pid	process
Token: SeDebugPrivilege	2004	Hrwfvhc.exe

Suspicious use of WriteProcessMemory 12 IoCs

Processes:

18e2b4fb63b38a0d2441bfa6f2afa3c6494e4f85479505f7d228447720ac0485.exeCzkorfvflbb.exe

description	pid	process	target process
PID 900 wrote to memory of 2004	900	18e2b4fb63b38a0d2441bfa6f2afa3c6494e4f85479505f7d228447720ac0485.exe	Hrwfvhc.exe
PID 900 wrote to memory of 2004	900	18e2b4fb63b38a0d2441bfa6f2afa3c6494e4f85479505f7d228447720ac0485.exe	Hrwfvhc.exe
PID 900 wrote to memory of 2004	900	18e2b4fb63b38a0d2441bfa6f2afa3c6494e4f85479505f7d228447720ac0485.exe	Hrwfvhc.exe
PID 900 wrote to memory of 2004	900	18e2b4fb63b38a0d2441bfa6f2afa3c6494e4f85479505f7d228447720ac0485.exe	Hrwfvhc.exe
PID 900 wrote to memory of 1952	900	18e2b4fb63b38a0d2441bfa6f2afa3c6494e4f85479505f7d228447720ac0485.exe	Czkorfvflbb.exe
PID 900 wrote to memory of 1952	900	18e2b4fb63b38a0d2441bfa6f2afa3c6494e4f85479505f7d228447720ac0485.exe	Czkorfvflbb.exe
PID 900 wrote to memory of 1952	900	18e2b4fb63b38a0d2441bfa6f2afa3c6494e4f85479505f7d228447720ac0485.exe	Czkorfvflbb.exe
PID 900 wrote to memory of 1952	900	18e2b4fb63b38a0d2441bfa6f2afa3c6494e4f85479505f7d228447720ac0485.exe	Czkorfvflbb.exe
PID 1952 wrote to memory of 1144	1952	Czkorfvflbb.exe	WerFault.exe
PID 1952 wrote to memory of 1144	1952	Czkorfvflbb.exe	WerFault.exe
PID 1952 wrote to memory of 1144	1952	Czkorfvflbb.exe	WerFault.exe
PID 1952 wrote to memory of 1144	1952	Czkorfvflbb.exe	WerFault.exe

C:\Users\Admin\AppData\Local\Temp\18e2b4fb63b38a0d2441bfa6f2afa3c6494e4f85479505f7d228447720ac0485.exe
"C:\Users\Admin\AppData\Local\Temp\18e2b4fb63b38a0d2441bfa6f2afa3c6494e4f85479505f7d228447720ac0485.exe"
1⤵
- Suspicious use of WriteProcessMemory
PID:900

C:\Users\Admin\AppData\Local\Temp\Hrwfvhc.exe
"C:\Users\Admin\AppData\Local\Temp\Hrwfvhc.exe"
2⤵
- Executes dropped EXE
- Suspicious use of AdjustPrivilegeToken
PID:2004

C:\Users\Admin\AppData\Local\Temp\Czkorfvflbb.exe
"C:\Users\Admin\AppData\Local\Temp\Czkorfvflbb.exe"
2⤵
- Executes dropped EXE
- Suspicious use of WriteProcessMemory
PID:1952

C:\Windows\SysWOW64\WerFault.exe
C:\Windows\SysWOW64\WerFault.exe -u -p 1952 -s 772
3⤵
- Loads dropped DLL
- Program crash
PID:1144

Network

MITRE ATT&CK Matrix ATT&CK v6

Initial Access

Execution

Persistence

Privilege Escalation

Defense Evasion

Credential Access

Credentials in Files

1

T1081

Discovery

System Information Discovery

1

T1082

Lateral Movement

Collection

Data from Local System

1

T1005

Exfiltration

Command and Control

Impact

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Downloads

C:\Users\Admin\AppData\Local\Temp\Czkorfvflbb.exe
Filesize
200KB

MD5
07ac7806a3f2bc0fc993d736ecb3572b

SHA1
49b54d7ece61cf9198dfc306a641f0d002b56acb

SHA256
165a20cece5bd869502d23ed2c9fdf5cb2e83451cca502b110f61371da70134d

SHA512
0bb78905d87356841e97e68be1d7c731f5cc4d15fa162017f9c520fceca327c589f8f31b9002c4869179af8626a03e89ef9b667a1a6d5e8f42eef2db98e1e123

Download Submit
C:\Users\Admin\AppData\Local\Temp\Hrwfvhc.exe
Filesize
1.4MB

MD5
a73d5a695cac720fdd6b1679c013efed

SHA1
9f9d210afc38d3d4967edf194811109393b4b3fe

SHA256
b8696cb287e5b8ca935cd69e266b17feae0f2b0f265608bedf9cdacfd025f7bf

SHA512
767ab55f6a21d9eb24f0708dae635cea85df511edbb530e9657155f7ec4791889879596622e5f1842665d4bf25f9d2a6f1090918fba16f29137acf41e93059bc

Download Submit
C:\Users\Admin\AppData\Local\Temp\Hrwfvhc.exe
Filesize
1.4MB

MD5
a73d5a695cac720fdd6b1679c013efed

SHA1
9f9d210afc38d3d4967edf194811109393b4b3fe

SHA256
b8696cb287e5b8ca935cd69e266b17feae0f2b0f265608bedf9cdacfd025f7bf

SHA512
767ab55f6a21d9eb24f0708dae635cea85df511edbb530e9657155f7ec4791889879596622e5f1842665d4bf25f9d2a6f1090918fba16f29137acf41e93059bc

Download Submit
\Users\Admin\AppData\Local\Temp\Czkorfvflbb.exe
Filesize
200KB

MD5
07ac7806a3f2bc0fc993d736ecb3572b

SHA1
49b54d7ece61cf9198dfc306a641f0d002b56acb

SHA256
165a20cece5bd869502d23ed2c9fdf5cb2e83451cca502b110f61371da70134d

SHA512
0bb78905d87356841e97e68be1d7c731f5cc4d15fa162017f9c520fceca327c589f8f31b9002c4869179af8626a03e89ef9b667a1a6d5e8f42eef2db98e1e123

Download Submit
\Users\Admin\AppData\Local\Temp\Czkorfvflbb.exe
Filesize
200KB

MD5
07ac7806a3f2bc0fc993d736ecb3572b

SHA1
49b54d7ece61cf9198dfc306a641f0d002b56acb

SHA256
165a20cece5bd869502d23ed2c9fdf5cb2e83451cca502b110f61371da70134d

SHA512
0bb78905d87356841e97e68be1d7c731f5cc4d15fa162017f9c520fceca327c589f8f31b9002c4869179af8626a03e89ef9b667a1a6d5e8f42eef2db98e1e123

Download Submit
\Users\Admin\AppData\Local\Temp\Czkorfvflbb.exe
Filesize
200KB

MD5
07ac7806a3f2bc0fc993d736ecb3572b

SHA1
49b54d7ece61cf9198dfc306a641f0d002b56acb

SHA256
165a20cece5bd869502d23ed2c9fdf5cb2e83451cca502b110f61371da70134d

SHA512
0bb78905d87356841e97e68be1d7c731f5cc4d15fa162017f9c520fceca327c589f8f31b9002c4869179af8626a03e89ef9b667a1a6d5e8f42eef2db98e1e123

Download Submit
memory/900-55-0x000007FEFBD81000-0x000007FEFBD83000-memory.dmp

Filesize
8KB

Download
memory/900-54-0x0000000000F90000-0x0000000000FE4000-memory.dmp

Filesize
336KB

Download
memory/1144-65-0x0000000000000000-mapping.dmp

Download
memory/1952-58-0x0000000000000000-mapping.dmp

Download
memory/1952-61-0x0000000076121000-0x0000000076123000-memory.dmp

Filesize
8KB

Download
memory/2004-56-0x0000000000000000-mapping.dmp

Download
memory/2004-62-0x0000000000AD0000-0x0000000000C3A000-memory.dmp

Filesize
1.4MB

Download
memory/2004-64-0x0000000004B45000-0x0000000004B56000-memory.dmp

Filesize
68KB

Download
memory/2004-69-0x0000000004B45000-0x0000000004B56000-memory.dmp

Filesize
68KB

Download

Analysis

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