oski | 4a440ef3be94895fcaaab5b4ba0755e8350e6131cabd507be510056739601df4

General

Target

74b37b00ec4ea2e2ee861621c5191ac2.exe
Size

1.3MB
MD5

74b37b00ec4ea2e2ee861621c5191ac2
SHA1

f711f8acd1b587e2edc557756019e367d3ac8c78
SHA256

4a440ef3be94895fcaaab5b4ba0755e8350e6131cabd507be510056739601df4
SHA512

9a01a5c237e774bef8caa889d424e069237c586d8de73552cf98dab1efd1e12c3362ead0627e0128eb30df0e65878243eed1283bdb3f08d7d03cdc10a35b9f2d

Score

10^/10

oski discovery infostealer spyware stealer

Malware Config

Signatures

Oski
Oski is an infostealer targeting browser data, crypto wallets.
infostealer oski
Downloads MZ/PE file
Loads dropped DLL 3 IoCs

Processes:

74b37b00ec4ea2e2ee861621c5191ac2.exe

pid process

3256 74b37b00ec4ea2e2ee861621c5191ac2.exe
3256 74b37b00ec4ea2e2ee861621c5191ac2.exe
3256 74b37b00ec4ea2e2ee861621c5191ac2.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 NtSetInformationThreadHideFromDebugger 3 IoCs

Processes:

74b37b00ec4ea2e2ee861621c5191ac2.exe

pid process

3256 74b37b00ec4ea2e2ee861621c5191ac2.exe
3256 74b37b00ec4ea2e2ee861621c5191ac2.exe
3256 74b37b00ec4ea2e2ee861621c5191ac2.exe
Enumerates physical storage devices 1 TTPs
Attempts to interact with connected storage/optical drive(s). Likely ransomware behaviour.

System Information Discovery
T1082

pid	process
3256	74b37b00ec4ea2e2ee861621c5191ac2.exe
3256	74b37b00ec4ea2e2ee861621c5191ac2.exe
3256	74b37b00ec4ea2e2ee861621c5191ac2.exe

pid	process
3256	74b37b00ec4ea2e2ee861621c5191ac2.exe
3256	74b37b00ec4ea2e2ee861621c5191ac2.exe
3256	74b37b00ec4ea2e2ee861621c5191ac2.exe

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:

74b37b00ec4ea2e2ee861621c5191ac2.exe

description	ioc	process
Key value queried	\REGISTRY\MACHINE\HARDWARE\DESCRIPTION\System\CentralProcessor\0\ProcessorNameString	74b37b00ec4ea2e2ee861621c5191ac2.exe

Kills process with taskkill 1 IoCs
evasion

Processes:

taskkill.exe

pid process

1400 taskkill.exe
Suspicious use of AdjustPrivilegeToken 1 IoCs

Processes:

taskkill.exe

description pid process

Token: SeDebugPrivilege 1400 taskkill.exe
Suspicious use of SetWindowsHookEx 1 IoCs

Processes:

74b37b00ec4ea2e2ee861621c5191ac2.exe

pid process

3256 74b37b00ec4ea2e2ee861621c5191ac2.exe

pid	process
1400	taskkill.exe

description	pid	process
Token: SeDebugPrivilege	1400	taskkill.exe

pid	process
3256	74b37b00ec4ea2e2ee861621c5191ac2.exe

Suspicious use of WriteProcessMemory 6 IoCs

Processes:

74b37b00ec4ea2e2ee861621c5191ac2.execmd.exe

description	pid	process	target process
PID 3256 wrote to memory of 3972	3256	74b37b00ec4ea2e2ee861621c5191ac2.exe	cmd.exe
PID 3256 wrote to memory of 3972	3256	74b37b00ec4ea2e2ee861621c5191ac2.exe	cmd.exe
PID 3256 wrote to memory of 3972	3256	74b37b00ec4ea2e2ee861621c5191ac2.exe	cmd.exe
PID 3972 wrote to memory of 1400	3972	cmd.exe	taskkill.exe
PID 3972 wrote to memory of 1400	3972	cmd.exe	taskkill.exe
PID 3972 wrote to memory of 1400	3972	cmd.exe	taskkill.exe

C:\Users\Admin\AppData\Local\Temp\74b37b00ec4ea2e2ee861621c5191ac2.exe
"C:\Users\Admin\AppData\Local\Temp\74b37b00ec4ea2e2ee861621c5191ac2.exe"
1⤵
- Loads dropped DLL
- Suspicious use of NtSetInformationThreadHideFromDebugger
- Checks processor information in registry
- Suspicious use of SetWindowsHookEx
- Suspicious use of WriteProcessMemory
PID:3256
- C:\Windows\SysWOW64\cmd.exe
  "C:\Windows\System32\cmd.exe" /c taskkill /pid 3256 & erase C:\Users\Admin\AppData\Local\Temp\74b37b00ec4ea2e2ee861621c5191ac2.exe & RD /S /Q C:\\ProgramData\\762212151241737\\* & exit
  2⤵
  - Suspicious use of WriteProcessMemory
  PID:3972
- - C:\Windows\SysWOW64\taskkill.exe
    taskkill /pid 3256
    3⤵
    - Kills process with taskkill
    - Suspicious use of AdjustPrivilegeToken
    PID:1400

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\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
memory/1400-119-0x0000000000000000-mapping.dmp

Download
memory/3256-114-0x0000000000AB0000-0x0000000000AB1000-memory.dmp

Filesize
4KB

Download
memory/3972-118-0x0000000000000000-mapping.dmp

Download

Analysis

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