oski | 2c57a483839755cc3457059ad20e96d3c6997b452fb85931f17b9bd327472abb

General

Target

VP83x7B6FVhJrp5.exe
Size

693KB
MD5

c8652278afcddfb2d0819cb20170ec69
SHA1

fbb977552bf08eff8449dfaad9e853b93fb831da
SHA256

96aaaea7fe5ece5fd42282815eb8d1e1d08ed6e167b2a239636f989604397ba4
SHA512

1d8da18faad797876bd0f5efd1531d7e021754e3fee285e04224dbf05e7d82379e8a74b4a24e9680264e55e11cc05c35dd9fc1a71ff977fa6592f148b2b2f260

Score

10^/10

oski infostealer spyware suricata

Malware Config

Extracted

Family

oski

C2

unitech.co.vu

Signatures

Oski
Oski is an infostealer targeting browser data, crypto wallets.
infostealer oski
suricata: ET MALWARE Suspicious Zipped Filename in Outbound POST Request (Passwords.txt)
suricata: ET MALWARE Suspicious Zipped Filename in Outbound POST Request (Passwords.txt)
suricata
suricata: ET MALWARE Suspicious Zipped Filename in Outbound POST Request (Passwords.txt) M2
suricata: ET MALWARE Suspicious Zipped Filename in Outbound POST Request (Passwords.txt) M2
suricata
suricata: ET MALWARE Suspicious Zipped Filename in Outbound POST Request (passwords.txt) M2
suricata: ET MALWARE Suspicious Zipped Filename in Outbound POST Request (passwords.txt) M2
suricata
suricata: ET MALWARE Vidar/Arkei/Megumin/Oski Stealer Data Exfil
suricata: ET MALWARE Vidar/Arkei/Megumin/Oski Stealer Data Exfil
suricata
suricata: ET MALWARE Vidar/Arkei/Megumin/Oski Stealer HTTP POST Pattern
suricata: ET MALWARE Vidar/Arkei/Megumin/Oski Stealer HTTP POST Pattern
suricata
Downloads MZ/PE file

Checks computer location settings 2 TTPs 1 IoCs

Looks up country code configured in the registry, likely geofence.

Query Registry

T1012

System Information Discovery

T1082

description	ioc	Process
Key value queried	\REGISTRY\USER\S-1-5-21-2632097139-1792035885-811742494-1000\Control Panel\International\Geo\Nation	VP83x7B6FVhJrp5.exe

Loads dropped DLL 3 IoCs

pid	Process
4736	MSBuild.exe
4736	MSBuild.exe
4736	MSBuild.exe

Accesses cryptocurrency files/wallets, possible credential harvesting 2 TTPs
spyware

Data from Local System
T1005

Credentials in Files
T1081

Suspicious use of SetThreadContext 1 IoCs

description	pid	Process	procid_target
PID 2896 set thread context of 4736	2896	VP83x7B6FVhJrp5.exe	93

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

System Information Discovery
T1082

Checks processor information in registry 2 TTPs 1 IoCs

Processor information is often read in order to detect sandboxing environments.

Query Registry

T1012

System Information Discovery

T1082

description	ioc	Process
Key value queried	\REGISTRY\MACHINE\HARDWARE\DESCRIPTION\System\CentralProcessor\0\ProcessorNameString	MSBuild.exe

Creates scheduled task(s) 1 TTPs 1 IoCs

Schtasks is often used by malware for persistence or to perform post-infection execution.

persistence

Scheduled Task

T1053

pid	Process
1824	schtasks.exe

Kills process with taskkill 1 IoCs

evasion

pid	Process
2508	taskkill.exe

Suspicious behavior: EnumeratesProcesses 6 IoCs

pid	Process
2896	VP83x7B6FVhJrp5.exe
3752	powershell.exe
2896	VP83x7B6FVhJrp5.exe
2896	VP83x7B6FVhJrp5.exe
2896	VP83x7B6FVhJrp5.exe
3752	powershell.exe

Suspicious use of AdjustPrivilegeToken 3 IoCs

description	pid	Process
Token: SeDebugPrivilege	2896	VP83x7B6FVhJrp5.exe
Token: SeDebugPrivilege	3752	powershell.exe
Token: SeDebugPrivilege	2508	taskkill.exe

Suspicious use of WriteProcessMemory 24 IoCs

description	pid	Process	procid_target
PID 2896 wrote to memory of 3752	2896	VP83x7B6FVhJrp5.exe	88
PID 2896 wrote to memory of 3752	2896	VP83x7B6FVhJrp5.exe	88
PID 2896 wrote to memory of 3752	2896	VP83x7B6FVhJrp5.exe	88
PID 2896 wrote to memory of 1824	2896	VP83x7B6FVhJrp5.exe	90
PID 2896 wrote to memory of 1824	2896	VP83x7B6FVhJrp5.exe	90
PID 2896 wrote to memory of 1824	2896	VP83x7B6FVhJrp5.exe	90
PID 2896 wrote to memory of 3924	2896	VP83x7B6FVhJrp5.exe	92
PID 2896 wrote to memory of 3924	2896	VP83x7B6FVhJrp5.exe	92
PID 2896 wrote to memory of 3924	2896	VP83x7B6FVhJrp5.exe	92
PID 2896 wrote to memory of 4736	2896	VP83x7B6FVhJrp5.exe	93
PID 2896 wrote to memory of 4736	2896	VP83x7B6FVhJrp5.exe	93
PID 2896 wrote to memory of 4736	2896	VP83x7B6FVhJrp5.exe	93
PID 2896 wrote to memory of 4736	2896	VP83x7B6FVhJrp5.exe	93
PID 2896 wrote to memory of 4736	2896	VP83x7B6FVhJrp5.exe	93
PID 2896 wrote to memory of 4736	2896	VP83x7B6FVhJrp5.exe	93
PID 2896 wrote to memory of 4736	2896	VP83x7B6FVhJrp5.exe	93
PID 2896 wrote to memory of 4736	2896	VP83x7B6FVhJrp5.exe	93
PID 2896 wrote to memory of 4736	2896	VP83x7B6FVhJrp5.exe	93
PID 4736 wrote to memory of 3912	4736	MSBuild.exe	95
PID 4736 wrote to memory of 3912	4736	MSBuild.exe	95
PID 4736 wrote to memory of 3912	4736	MSBuild.exe	95
PID 3912 wrote to memory of 2508	3912	cmd.exe	97
PID 3912 wrote to memory of 2508	3912	cmd.exe	97
PID 3912 wrote to memory of 2508	3912	cmd.exe	97

C:\Users\Admin\AppData\Local\Temp\VP83x7B6FVhJrp5.exe
"C:\Users\Admin\AppData\Local\Temp\VP83x7B6FVhJrp5.exe"
1⤵
- Checks computer location settings
- Suspicious use of SetThreadContext
- Suspicious behavior: EnumeratesProcesses
- Suspicious use of AdjustPrivilegeToken
- Suspicious use of WriteProcessMemory
PID:2896
- C:\Windows\SysWOW64\WindowsPowerShell\v1.0\powershell.exe
  "C:\Windows\System32\WindowsPowerShell\v1.0\powershell.exe" Add-MpPreference -ExclusionPath "C:\Users\Admin\AppData\Roaming\iILFFkR.exe"
  2⤵
  - Suspicious behavior: EnumeratesProcesses
  - Suspicious use of AdjustPrivilegeToken
  PID:3752
- C:\Windows\SysWOW64\schtasks.exe
  "C:\Windows\System32\schtasks.exe" /Create /TN "Updates\iILFFkR" /XML "C:\Users\Admin\AppData\Local\Temp\tmp14EF.tmp"
  2⤵
  - Creates scheduled task(s)
  PID:1824
- C:\Windows\Microsoft.NET\Framework\v4.0.30319\MSBuild.exe
  "C:\Windows\Microsoft.NET\Framework\v4.0.30319\MSBuild.exe"
  2⤵
  PID:3924
- C:\Windows\Microsoft.NET\Framework\v4.0.30319\MSBuild.exe
  "C:\Windows\Microsoft.NET\Framework\v4.0.30319\MSBuild.exe"
  2⤵
  - Loads dropped DLL
  - Checks processor information in registry
  - Suspicious use of WriteProcessMemory
  PID:4736
- - C:\Windows\SysWOW64\cmd.exe
    "C:\Windows\System32\cmd.exe" /c taskkill /pid 4736 & erase C:\Windows\Microsoft.NET\Framework\v4.0.30319\MSBuild.exe & RD /S /Q C:\\ProgramData\\032959608721724\\* & exit
    3⤵
    - Suspicious use of WriteProcessMemory
    PID:3912
  - - C:\Windows\SysWOW64\taskkill.exe
      taskkill /pid 4736
      4⤵
      Kills process with taskkill
      Suspicious use of AdjustPrivilegeToken
      PID:2508

Network

MITRE ATT&CK Enterprise v6

Initial Access

Execution

Scheduled Task

1

T1053

Persistence

Scheduled Task

1

T1053

Privilege Escalation

Scheduled Task

1

T1053

Defense Evasion

Credential Access

Credentials in Files

1

T1081

Discovery

Query Registry

2

T1012

System Information Discovery

3

T1082

Lateral Movement

Collection

Data from Local System

1

T1005

Command and Control

Exfiltration

Impact

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Downloads

C:\ProgramData\mozglue.dll

Filesize
133KB

MD5
8f73c08a9660691143661bf7332c3c27

SHA1
37fa65dd737c50fda710fdbde89e51374d0c204a

SHA256
3fe6b1c54b8cf28f571e0c5d6636b4069a8ab00b4f11dd842cfec00691d0c9cd

SHA512
0042ecf9b3571bb5eba2de893e8b2371df18f7c5a589f52ee66e4bfbaa15a5b8b7cc6a155792aaa8988528c27196896d5e82e1751c998bacea0d92395f66ad89

Download Submit
C:\ProgramData\nss3.dll

Filesize
1.2MB

MD5
bfac4e3c5908856ba17d41edcd455a51

SHA1
8eec7e888767aa9e4cca8ff246eb2aacb9170428

SHA256
e2935b5b28550d47dc971f456d6961f20d1633b4892998750140e0eaa9ae9d78

SHA512
2565bab776c4d732ffb1f9b415992a4c65b81bcd644a9a1df1333a269e322925fc1df4f76913463296efd7c88ef194c3056de2f1ca1357d7b5fe5ff0da877a66

Download Submit
C:\ProgramData\sqlite3.dll

Filesize
630KB

MD5
e477a96c8f2b18d6b5c27bde49c990bf

SHA1
e980c9bf41330d1e5bd04556db4646a0210f7409

SHA256
16574f51785b0e2fc29c2c61477eb47bb39f714829999511dc8952b43ab17660

SHA512
335a86268e7c0e568b1c30981ec644e6cd332e66f96d2551b58a82515316693c1859d87b4f4b7310cf1ac386cee671580fdd999c3bcb23acf2c2282c01c8798c

Download Submit
C:\Users\Admin\AppData\Local\Temp\tmp14EF.tmp

Filesize
1KB

MD5
cd0f8c2d9ebcc91d0d3e8d7c4b9d4fa7

SHA1
79afbba8757a03231e3874d0cc5ec6624ecbbc8c

SHA256
31cf1a1640eee762a1adcaaf89c76c7f4b9bd9542a0a7eabba3d8e6207e2bbf4

SHA512
1dc732c314a947b2ffba966654e6448603771fab3d70e63db12c4caddf431ab813d36eb17846e05ca2936b9647b23dd0225de9f65480f9ba654a888ab30cec0a

Download Submit
memory/2896-134-0x000000000B740000-0x000000000B7DC000-memory.dmp

Filesize
624KB

Download
memory/2896-135-0x000000000BDC0000-0x000000000BE26000-memory.dmp

Filesize
408KB

Download
memory/2896-131-0x00000000082B0000-0x0000000008854000-memory.dmp

Filesize
5.6MB

Download
memory/2896-130-0x0000000000ED0000-0x0000000000F84000-memory.dmp

Filesize
720KB

Download
memory/2896-132-0x0000000007E00000-0x0000000007E92000-memory.dmp

Filesize
584KB

Download
memory/2896-133-0x0000000007EB0000-0x0000000007EBA000-memory.dmp

Filesize
40KB

Download
memory/3752-140-0x0000000004FB0000-0x00000000055D8000-memory.dmp

Filesize
6.2MB

Download
memory/3752-150-0x0000000006430000-0x0000000006462000-memory.dmp

Filesize
200KB

Download
memory/3752-149-0x0000000005D80000-0x0000000005D9E000-memory.dmp

Filesize
120KB

Download
memory/3752-145-0x0000000005790000-0x00000000057F6000-memory.dmp

Filesize
408KB

Download
memory/3752-151-0x00000000713B0000-0x00000000713FC000-memory.dmp

Filesize
304KB

Download
memory/3752-162-0x00000000074A0000-0x00000000074A8000-memory.dmp

Filesize
32KB

Download
memory/3752-161-0x00000000074C0000-0x00000000074DA000-memory.dmp

Filesize
104KB

Download
memory/3752-160-0x00000000073B0000-0x00000000073BE000-memory.dmp

Filesize
56KB

Download
memory/3752-138-0x0000000002580000-0x00000000025B6000-memory.dmp

Filesize
216KB

Download
memory/3752-152-0x0000000006410000-0x000000000642E000-memory.dmp

Filesize
120KB

Download
memory/3752-153-0x00000000077C0000-0x0000000007E3A000-memory.dmp

Filesize
6.5MB

Download
memory/3752-154-0x0000000007180000-0x000000000719A000-memory.dmp

Filesize
104KB

Download
memory/3752-155-0x00000000071F0000-0x00000000071FA000-memory.dmp

Filesize
40KB

Download
memory/3752-156-0x0000000007400000-0x0000000007496000-memory.dmp

Filesize
600KB

Download
memory/3752-141-0x0000000004EB0000-0x0000000004ED2000-memory.dmp

Filesize
136KB

Download
memory/4736-146-0x0000000000400000-0x0000000000438000-memory.dmp

Filesize
224KB

Download
memory/4736-148-0x0000000000400000-0x0000000000438000-memory.dmp

Filesize
224KB

Download
memory/4736-147-0x0000000000400000-0x0000000000438000-memory.dmp

Filesize
224KB

Download
memory/4736-164-0x0000000000400000-0x0000000000438000-memory.dmp

Filesize
224KB

Download
memory/4736-144-0x0000000000400000-0x0000000000438000-memory.dmp

Filesize
224KB

Download

Analysis

Sharing

General

Malware Config

Extracted

Signatures

Processes

Network

MITRE ATT&CK Enterprise v6

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Downloads