oski | 85b04366a901afa7df0d75f192032dccaee58e83827d7bd71674e202043d4f90

General

Target

6ae3b362c05a0d47368dbe6e8512c01f.exe
Size

632KB
MD5

6ae3b362c05a0d47368dbe6e8512c01f
SHA1

df946045c50b64ec46c5964d3f3fe53dc17a3832
SHA256

85b04366a901afa7df0d75f192032dccaee58e83827d7bd71674e202043d4f90
SHA512

8b0179abde7cfedcec04f7c80394b44afd74f4b0aed4ca05268ca53fe166ef26f1ddeecc9ee96cfc500ae09fb482f8a9bbff85d855cccd8b9022ff696434ab7f

Score

10^/10

oski discovery infostealer spyware stealer suricata

Malware Config

Extracted

Family

oski

C2

tvscreen.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

Deletes itself 1 IoCs

pid	Process
1952	cmd.exe

Loads dropped DLL 3 IoCs

pid	Process
1324	6ae3b362c05a0d47368dbe6e8512c01f.exe
1324	6ae3b362c05a0d47368dbe6e8512c01f.exe
1324	6ae3b362c05a0d47368dbe6e8512c01f.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
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 1672 set thread context of 1324	1672	6ae3b362c05a0d47368dbe6e8512c01f.exe	28

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	6ae3b362c05a0d47368dbe6e8512c01f.exe

Kills process with taskkill 1 IoCs

evasion

pid	Process
1100	taskkill.exe

Suspicious use of AdjustPrivilegeToken 1 IoCs

description	pid	Process
Token: SeDebugPrivilege	1100	taskkill.exe

Suspicious use of WriteProcessMemory 18 IoCs

description	pid	Process	procid_target
PID 1672 wrote to memory of 1324	1672	6ae3b362c05a0d47368dbe6e8512c01f.exe	28
PID 1672 wrote to memory of 1324	1672	6ae3b362c05a0d47368dbe6e8512c01f.exe	28
PID 1672 wrote to memory of 1324	1672	6ae3b362c05a0d47368dbe6e8512c01f.exe	28
PID 1672 wrote to memory of 1324	1672	6ae3b362c05a0d47368dbe6e8512c01f.exe	28
PID 1672 wrote to memory of 1324	1672	6ae3b362c05a0d47368dbe6e8512c01f.exe	28
PID 1672 wrote to memory of 1324	1672	6ae3b362c05a0d47368dbe6e8512c01f.exe	28
PID 1672 wrote to memory of 1324	1672	6ae3b362c05a0d47368dbe6e8512c01f.exe	28
PID 1672 wrote to memory of 1324	1672	6ae3b362c05a0d47368dbe6e8512c01f.exe	28
PID 1672 wrote to memory of 1324	1672	6ae3b362c05a0d47368dbe6e8512c01f.exe	28
PID 1672 wrote to memory of 1324	1672	6ae3b362c05a0d47368dbe6e8512c01f.exe	28
PID 1324 wrote to memory of 1952	1324	6ae3b362c05a0d47368dbe6e8512c01f.exe	31
PID 1324 wrote to memory of 1952	1324	6ae3b362c05a0d47368dbe6e8512c01f.exe	31
PID 1324 wrote to memory of 1952	1324	6ae3b362c05a0d47368dbe6e8512c01f.exe	31
PID 1324 wrote to memory of 1952	1324	6ae3b362c05a0d47368dbe6e8512c01f.exe	31
PID 1952 wrote to memory of 1100	1952	cmd.exe	33
PID 1952 wrote to memory of 1100	1952	cmd.exe	33
PID 1952 wrote to memory of 1100	1952	cmd.exe	33
PID 1952 wrote to memory of 1100	1952	cmd.exe	33

C:\Users\Admin\AppData\Local\Temp\6ae3b362c05a0d47368dbe6e8512c01f.exe
"C:\Users\Admin\AppData\Local\Temp\6ae3b362c05a0d47368dbe6e8512c01f.exe"
1⤵
- Suspicious use of SetThreadContext
- Suspicious use of WriteProcessMemory
PID:1672
- C:\Users\Admin\AppData\Local\Temp\6ae3b362c05a0d47368dbe6e8512c01f.exe
  "C:\Users\Admin\AppData\Local\Temp\6ae3b362c05a0d47368dbe6e8512c01f.exe"
  2⤵
  - Loads dropped DLL
  - Checks processor information in registry
  - Suspicious use of WriteProcessMemory
  PID:1324
- - C:\Windows\SysWOW64\cmd.exe
    "C:\Windows\System32\cmd.exe" /c taskkill /pid 1324 & erase C:\Users\Admin\AppData\Local\Temp\6ae3b362c05a0d47368dbe6e8512c01f.exe & RD /S /Q C:\\ProgramData\\218725097303923\\* & exit
    3⤵
    - Deletes itself
    - Suspicious use of WriteProcessMemory
    PID:1952
  - - C:\Windows\SysWOW64\taskkill.exe
      taskkill /pid 1324
      4⤵
      Kills process with taskkill
      Suspicious use of AdjustPrivilegeToken
      PID:1100

Network

MITRE ATT&CK Enterprise v6

Initial Access

Execution

Persistence

Privilege Escalation

Defense Evasion

Credential Access

Credentials in Files

2

T1081

Discovery

Query Registry

2

T1012

System Information Discovery

2

T1082

Lateral Movement

Collection

Data from Local System

2

T1005

Command and Control

Exfiltration

Impact

Replay Monitor

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Downloads

\ProgramData\mozglue.dll

Filesize
133KB

MD5
8f73c08a9660691143661bf7332c3c27

SHA1
37fa65dd737c50fda710fdbde89e51374d0c204a

SHA256
3fe6b1c54b8cf28f571e0c5d6636b4069a8ab00b4f11dd842cfec00691d0c9cd

SHA512
0042ecf9b3571bb5eba2de893e8b2371df18f7c5a589f52ee66e4bfbaa15a5b8b7cc6a155792aaa8988528c27196896d5e82e1751c998bacea0d92395f66ad89

Download Submit
\ProgramData\nss3.dll

Filesize
1.2MB

MD5
bfac4e3c5908856ba17d41edcd455a51

SHA1
8eec7e888767aa9e4cca8ff246eb2aacb9170428

SHA256
e2935b5b28550d47dc971f456d6961f20d1633b4892998750140e0eaa9ae9d78

SHA512
2565bab776c4d732ffb1f9b415992a4c65b81bcd644a9a1df1333a269e322925fc1df4f76913463296efd7c88ef194c3056de2f1ca1357d7b5fe5ff0da877a66

Download Submit
\ProgramData\sqlite3.dll

Filesize
630KB

MD5
e477a96c8f2b18d6b5c27bde49c990bf

SHA1
e980c9bf41330d1e5bd04556db4646a0210f7409

SHA256
16574f51785b0e2fc29c2c61477eb47bb39f714829999511dc8952b43ab17660

SHA512
335a86268e7c0e568b1c30981ec644e6cd332e66f96d2551b58a82515316693c1859d87b4f4b7310cf1ac386cee671580fdd999c3bcb23acf2c2282c01c8798c

Download Submit
memory/1324-67-0x0000000000400000-0x0000000000438000-memory.dmp

Filesize
224KB

Download
memory/1324-69-0x0000000000400000-0x0000000000438000-memory.dmp

Filesize
224KB

Download
memory/1324-60-0x0000000000400000-0x0000000000438000-memory.dmp

Filesize
224KB

Download
memory/1324-61-0x0000000000400000-0x0000000000438000-memory.dmp

Filesize
224KB

Download
memory/1324-65-0x0000000000400000-0x0000000000438000-memory.dmp

Filesize
224KB

Download
memory/1324-63-0x0000000000400000-0x0000000000438000-memory.dmp

Filesize
224KB

Download
memory/1324-74-0x0000000000400000-0x0000000000438000-memory.dmp

Filesize
224KB

Download
memory/1324-72-0x0000000000400000-0x0000000000438000-memory.dmp

Filesize
224KB

Download
memory/1672-59-0x0000000002130000-0x0000000002168000-memory.dmp

Filesize
224KB

Download
memory/1672-54-0x00000000009F0000-0x0000000000A92000-memory.dmp

Filesize
648KB

Download
memory/1672-58-0x0000000000660000-0x0000000000666000-memory.dmp

Filesize
24KB

Download
memory/1672-57-0x0000000005D40000-0x0000000005DD4000-memory.dmp

Filesize
592KB

Download
memory/1672-56-0x0000000000360000-0x000000000036E000-memory.dmp

Filesize
56KB

Download
memory/1672-55-0x00000000753B1000-0x00000000753B3000-memory.dmp

Filesize
8KB

Download

Analysis

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