oski | 4ac4190585ef636ef707459413641fcd87fc6e4f3b112b72b564554e16d9fa2f

General

Target

4ac4190585ef636ef707459413641fcd87fc6e4f3b112b72b564554e16d9fa2f.exe
Size

264KB
MD5

17b3383a638c8e71894afdab1a2a5663
SHA1

4c26ddeab4ae5bc78bfd9002e021311c80ea0396
SHA256

4ac4190585ef636ef707459413641fcd87fc6e4f3b112b72b564554e16d9fa2f
SHA512

265a8dd85bc1c3e456e38734818f08faf4c71451082dca9dd7182c348284158ff31771eb4d2ebf6ee157640ee91825c90e57a326d17af7d72efae030af23fb5c
SSDEEP

3072:8S8RUOa/qrXc/5YDuSrtJxQMOGcNZUKFLYhlBOGov1DsHMchNvHVial6Px7QeZkC:92A/UuSfxrZcrjLYvBBovi7JgP

Score

10^/10

oski discovery infostealer persistence spyware stealer

Malware Config

Extracted

Family

oski

C2

anstransport.com

Signatures

Oski
Oski is an infostealer targeting browser data, crypto wallets.
infostealer oski
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-1-5-21-929662420-1054238289-2961194603-1000\Control Panel\International\Geo\Nation	4ac4190585ef636ef707459413641fcd87fc6e4f3b112b72b564554e16d9fa2f.exe

Loads dropped DLL 3 IoCs

pid	Process
1664	4ac4190585ef636ef707459413641fcd87fc6e4f3b112b72b564554e16d9fa2f.exe
1664	4ac4190585ef636ef707459413641fcd87fc6e4f3b112b72b564554e16d9fa2f.exe
1664	4ac4190585ef636ef707459413641fcd87fc6e4f3b112b72b564554e16d9fa2f.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
Accesses cryptocurrency files/wallets, possible credential harvesting 2 TTPs
spyware

Data from Local System
T1005

Credentials in Files
T1081

Adds Run key to start application 2 TTPs 1 IoCs

persistence

Registry Run Keys / Startup Folder

T1060

Modify Registry

T1112

description	ioc	Process
Set value (str)	\REGISTRY\USER\S-1-5-21-929662420-1054238289-2961194603-1000\SOFTWARE\Microsoft\Windows\CurrentVersion\RunOnce\Windows Services = "C:\\Users\\Admin\\AppData\\Roaming\\Windows Update Folder\\Windows Update.exe"	4ac4190585ef636ef707459413641fcd87fc6e4f3b112b72b564554e16d9fa2f.exe

Checks installed software on the system 1 TTPs
Looks up Uninstall key entries in the registry to enumerate software on the system.
discovery

Query Registry
T1012

Suspicious use of SetThreadContext 1 IoCs

description	pid	Process	procid_target
PID 4936 set thread context of 1664	4936	4ac4190585ef636ef707459413641fcd87fc6e4f3b112b72b564554e16d9fa2f.exe	82

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	4ac4190585ef636ef707459413641fcd87fc6e4f3b112b72b564554e16d9fa2f.exe

Kills process with taskkill 1 IoCs

evasion

pid	Process
116	taskkill.exe

Suspicious use of AdjustPrivilegeToken 1 IoCs

description	pid	Process
Token: SeDebugPrivilege	116	taskkill.exe

Suspicious use of WriteProcessMemory 15 IoCs

description	pid	Process	procid_target
PID 4936 wrote to memory of 1664	4936	4ac4190585ef636ef707459413641fcd87fc6e4f3b112b72b564554e16d9fa2f.exe	82
PID 4936 wrote to memory of 1664	4936	4ac4190585ef636ef707459413641fcd87fc6e4f3b112b72b564554e16d9fa2f.exe	82
PID 4936 wrote to memory of 1664	4936	4ac4190585ef636ef707459413641fcd87fc6e4f3b112b72b564554e16d9fa2f.exe	82
PID 4936 wrote to memory of 1664	4936	4ac4190585ef636ef707459413641fcd87fc6e4f3b112b72b564554e16d9fa2f.exe	82
PID 4936 wrote to memory of 1664	4936	4ac4190585ef636ef707459413641fcd87fc6e4f3b112b72b564554e16d9fa2f.exe	82
PID 4936 wrote to memory of 1664	4936	4ac4190585ef636ef707459413641fcd87fc6e4f3b112b72b564554e16d9fa2f.exe	82
PID 4936 wrote to memory of 1664	4936	4ac4190585ef636ef707459413641fcd87fc6e4f3b112b72b564554e16d9fa2f.exe	82
PID 4936 wrote to memory of 1664	4936	4ac4190585ef636ef707459413641fcd87fc6e4f3b112b72b564554e16d9fa2f.exe	82
PID 4936 wrote to memory of 1664	4936	4ac4190585ef636ef707459413641fcd87fc6e4f3b112b72b564554e16d9fa2f.exe	82
PID 1664 wrote to memory of 1860	1664	4ac4190585ef636ef707459413641fcd87fc6e4f3b112b72b564554e16d9fa2f.exe	86
PID 1664 wrote to memory of 1860	1664	4ac4190585ef636ef707459413641fcd87fc6e4f3b112b72b564554e16d9fa2f.exe	86
PID 1664 wrote to memory of 1860	1664	4ac4190585ef636ef707459413641fcd87fc6e4f3b112b72b564554e16d9fa2f.exe	86
PID 1860 wrote to memory of 116	1860	cmd.exe	88
PID 1860 wrote to memory of 116	1860	cmd.exe	88
PID 1860 wrote to memory of 116	1860	cmd.exe	88

C:\Users\Admin\AppData\Local\Temp\4ac4190585ef636ef707459413641fcd87fc6e4f3b112b72b564554e16d9fa2f.exe
"C:\Users\Admin\AppData\Local\Temp\4ac4190585ef636ef707459413641fcd87fc6e4f3b112b72b564554e16d9fa2f.exe"
1⤵
- Adds Run key to start application
- Suspicious use of SetThreadContext
- Suspicious use of WriteProcessMemory
PID:4936
- C:\Users\Admin\AppData\Local\Temp\4ac4190585ef636ef707459413641fcd87fc6e4f3b112b72b564554e16d9fa2f.exe
  "C:\Users\Admin\AppData\Local\Temp\4ac4190585ef636ef707459413641fcd87fc6e4f3b112b72b564554e16d9fa2f.exe"
  2⤵
  - Checks computer location settings
  - Loads dropped DLL
  - Checks processor information in registry
  - Suspicious use of WriteProcessMemory
  PID:1664
- - C:\Windows\SysWOW64\cmd.exe
    "C:\Windows\System32\cmd.exe" /c taskkill /pid 1664 & erase C:\Users\Admin\AppData\Local\Temp\4ac4190585ef636ef707459413641fcd87fc6e4f3b112b & RD /S /Q C:\\ProgramData\\324102785032741\\* & exit
    3⤵
    - Suspicious use of WriteProcessMemory
    PID:1860
  - - C:\Windows\SysWOW64\taskkill.exe
      taskkill /pid 1664
      4⤵
      Kills process with taskkill
      Suspicious use of AdjustPrivilegeToken
      PID:116

Network

MITRE ATT&CK Enterprise v6

Initial Access

Execution

Persistence

Registry Run Keys / Startup Folder

1

T1060

Privilege Escalation

Defense Evasion

Modify Registry

1

T1112

Credential Access

Credentials in Files

2

T1081

Discovery

Query Registry

3

T1012

System Information Discovery

3

T1082

Lateral Movement

Collection

Data from Local System

2

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
memory/1664-141-0x0000000000400000-0x0000000000438000-memory.dmp

Filesize
224KB

Download
memory/1664-140-0x0000000000400000-0x0000000000438000-memory.dmp

Filesize
224KB

Download
memory/1664-142-0x0000000000400000-0x0000000000438000-memory.dmp

Filesize
224KB

Download
memory/1664-143-0x0000000000400000-0x0000000000438000-memory.dmp

Filesize
224KB

Download
memory/1664-148-0x0000000000400000-0x0000000000438000-memory.dmp

Filesize
224KB

Download
memory/4936-135-0x00000000004E0000-0x000000000052A000-memory.dmp

Filesize
296KB

Download
memory/4936-138-0x0000000005030000-0x00000000050CC000-memory.dmp

Filesize
624KB

Download
memory/4936-137-0x0000000004EE0000-0x0000000004F72000-memory.dmp

Filesize
584KB

Download
memory/4936-136-0x0000000005540000-0x0000000005AE4000-memory.dmp

Filesize
5.6MB

Download

Analysis

Sharing

General

Malware Config

Extracted

Signatures

Processes

Network

MITRE ATT&CK Enterprise v6

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Downloads