oski | 244cc88debf6465b93584d1f63c592c52bd029deec2f24fc4a3328725838d239

General

Target

PO5621.scr.exe
Size

306KB
MD5

b0926a6e4c1887f81024b17df73199c5
SHA1

3fcdd6ff8323713c8cf3e11edca6c5e195dd4139
SHA256

244cc88debf6465b93584d1f63c592c52bd029deec2f24fc4a3328725838d239
SHA512

b16dd1c26ce8c4654202a9ca779f3a2ce12a563a5b7670e06610829d2b1abd092543a524247ed7997d56f26bb1d02b5c6310eb12a5a741260ab298fb5d61f1f8

Score

10^/10

oski discovery infostealer spyware stealer

Malware Config

Extracted

Family

oski

C2

203.159.80.65

Signatures

Oski
Oski is an infostealer targeting browser data, crypto wallets.
infostealer oski
Downloads MZ/PE file
Deletes itself 1 IoCs

Processes:

cmd.exe

pid process

1484 cmd.exe
Loads dropped DLL 6 IoCs

Processes:

PO5621.scr.exePO5621.scr.exe

pid process

1096 PO5621.scr.exe
1200 PO5621.scr.exe
1200 PO5621.scr.exe
1200 PO5621.scr.exe
1200 PO5621.scr.exe
1200 PO5621.scr.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

Processes:

PO5621.scr.exe

description pid process target process

PID 1096 set thread context of 1200 1096 PO5621.scr.exe PO5621.scr.exe
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

Processes:

PO5621.scr.exe

description ioc process

Key value queried \REGISTRY\MACHINE\HARDWARE\DESCRIPTION\System\CentralProcessor\0\ProcessorNameString PO5621.scr.exe
Kills process with taskkill 1 IoCs
evasion

Processes:

taskkill.exe

pid process

876 taskkill.exe
Suspicious behavior: MapViewOfSection 1 IoCs

Processes:

PO5621.scr.exe

pid process

1096 PO5621.scr.exe
Suspicious use of AdjustPrivilegeToken 1 IoCs

Processes:

taskkill.exe

description pid process

Token: SeDebugPrivilege 876 taskkill.exe

pid	process
1484	cmd.exe

pid	process
1096	PO5621.scr.exe
1200	PO5621.scr.exe
1200	PO5621.scr.exe
1200	PO5621.scr.exe
1200	PO5621.scr.exe
1200	PO5621.scr.exe

description	pid	process	target process
PID 1096 set thread context of 1200	1096	PO5621.scr.exe	PO5621.scr.exe

description	ioc	process
Key value queried	\REGISTRY\MACHINE\HARDWARE\DESCRIPTION\System\CentralProcessor\0\ProcessorNameString	PO5621.scr.exe

pid	process
876	taskkill.exe

pid	process
1096	PO5621.scr.exe

description	pid	process
Token: SeDebugPrivilege	876	taskkill.exe

Suspicious use of WriteProcessMemory 13 IoCs

Processes:

PO5621.scr.exePO5621.scr.execmd.exe

description	pid	process	target process
PID 1096 wrote to memory of 1200	1096	PO5621.scr.exe	PO5621.scr.exe
PID 1096 wrote to memory of 1200	1096	PO5621.scr.exe	PO5621.scr.exe
PID 1096 wrote to memory of 1200	1096	PO5621.scr.exe	PO5621.scr.exe
PID 1096 wrote to memory of 1200	1096	PO5621.scr.exe	PO5621.scr.exe
PID 1096 wrote to memory of 1200	1096	PO5621.scr.exe	PO5621.scr.exe
PID 1200 wrote to memory of 1484	1200	PO5621.scr.exe	cmd.exe
PID 1200 wrote to memory of 1484	1200	PO5621.scr.exe	cmd.exe
PID 1200 wrote to memory of 1484	1200	PO5621.scr.exe	cmd.exe
PID 1200 wrote to memory of 1484	1200	PO5621.scr.exe	cmd.exe
PID 1484 wrote to memory of 876	1484	cmd.exe	taskkill.exe
PID 1484 wrote to memory of 876	1484	cmd.exe	taskkill.exe
PID 1484 wrote to memory of 876	1484	cmd.exe	taskkill.exe
PID 1484 wrote to memory of 876	1484	cmd.exe	taskkill.exe

C:\Users\Admin\AppData\Local\Temp\PO5621.scr.exe
"C:\Users\Admin\AppData\Local\Temp\PO5621.scr.exe"
1⤵
- Loads dropped DLL
- Suspicious use of SetThreadContext
- Suspicious behavior: MapViewOfSection
- Suspicious use of WriteProcessMemory
PID:1096
- C:\Users\Admin\AppData\Local\Temp\PO5621.scr.exe
  "C:\Users\Admin\AppData\Local\Temp\PO5621.scr.exe"
  2⤵
  - Loads dropped DLL
  - Checks processor information in registry
  - Suspicious use of WriteProcessMemory
  PID:1200
- - C:\Windows\SysWOW64\cmd.exe
    "C:\Windows\System32\cmd.exe" /c taskkill /pid 1200 & erase C:\Users\Admin\AppData\Local\Temp\PO5621.scr.exe & RD /S /Q C:\\ProgramData\\546498067793251\\* & exit
    3⤵
    - Deletes itself
    - Suspicious use of WriteProcessMemory
    PID:1484
  - - C:\Windows\SysWOW64\taskkill.exe
      taskkill /pid 1200
      4⤵
      Kills process with taskkill
      Suspicious use of AdjustPrivilegeToken
      PID:876

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

MD5
8f73c08a9660691143661bf7332c3c27

SHA1
37fa65dd737c50fda710fdbde89e51374d0c204a

SHA256
3fe6b1c54b8cf28f571e0c5d6636b4069a8ab00b4f11dd842cfec00691d0c9cd

SHA512
0042ecf9b3571bb5eba2de893e8b2371df18f7c5a589f52ee66e4bfbaa15a5b8b7cc6a155792aaa8988528c27196896d5e82e1751c998bacea0d92395f66ad89

Download Submit
\ProgramData\msvcp140.dll

MD5
109f0f02fd37c84bfc7508d4227d7ed5

SHA1
ef7420141bb15ac334d3964082361a460bfdb975

SHA256
334e69ac9367f708ce601a6f490ff227d6c20636da5222f148b25831d22e13d4

SHA512
46eb62b65817365c249b48863d894b4669e20fcb3992e747cd5c9fdd57968e1b2cf7418d1c9340a89865eadda362b8db51947eb4427412eb83b35994f932fd39

Download Submit
\ProgramData\nss3.dll

MD5
bfac4e3c5908856ba17d41edcd455a51

SHA1
8eec7e888767aa9e4cca8ff246eb2aacb9170428

SHA256
e2935b5b28550d47dc971f456d6961f20d1633b4892998750140e0eaa9ae9d78

SHA512
2565bab776c4d732ffb1f9b415992a4c65b81bcd644a9a1df1333a269e322925fc1df4f76913463296efd7c88ef194c3056de2f1ca1357d7b5fe5ff0da877a66

Download Submit
\ProgramData\sqlite3.dll

MD5
e477a96c8f2b18d6b5c27bde49c990bf

SHA1
e980c9bf41330d1e5bd04556db4646a0210f7409

SHA256
16574f51785b0e2fc29c2c61477eb47bb39f714829999511dc8952b43ab17660

SHA512
335a86268e7c0e568b1c30981ec644e6cd332e66f96d2551b58a82515316693c1859d87b4f4b7310cf1ac386cee671580fdd999c3bcb23acf2c2282c01c8798c

Download Submit
\ProgramData\vcruntime140.dll

MD5
7587bf9cb4147022cd5681b015183046

SHA1
f2106306a8f6f0da5afb7fc765cfa0757ad5a628

SHA256
c40bb03199a2054dabfc7a8e01d6098e91de7193619effbd0f142a7bf031c14d

SHA512
0b63e4979846ceba1b1ed8470432ea6aa18cca66b5f5322d17b14bc0dfa4b2ee09ca300a016e16a01db5123e4e022820698f46d9bad1078bd24675b4b181e91f

Download Submit
\Users\Admin\AppData\Local\Temp\nsc2FE7.tmp\9ma115elvnv.dll

MD5
8102c61b4698d608f7912b3979dc60a9

SHA1
48741a2b677d4214dce9dd7fdc8c09f0c71273e4

SHA256
b4e1b5a689c836a40a478137f6335f193f0eda0a90f8bd7868c6e7bc96f30fe3

SHA512
495be5aef1a63b6270aa0f92c68f13c21e16ef3ddd943507f66af25659dc1aa0b465d1e857af06f42fe05983b07ef1d3b0c96a7a595d84066517264d70640a8d

Download Submit
memory/876-72-0x0000000000000000-mapping.dmp

Download
memory/1096-60-0x0000000075281000-0x0000000075283000-memory.dmp

Filesize
8KB

Download
memory/1096-64-0x00000000003C0000-0x00000000003C2000-memory.dmp

Filesize
8KB

Download
memory/1200-62-0x000000000040717B-mapping.dmp

Download
memory/1200-65-0x0000000000400000-0x0000000000438000-memory.dmp

Filesize
224KB

Download
memory/1484-71-0x0000000000000000-mapping.dmp

Download

Analysis

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