oski | d346665dc0a3c37256f313f6e9e41c254acf70c599d007f1391128c4b3771ce6

General

Target

5753388fbfcde9e08d00ac9e2be5d881.exe
Size

245KB
MD5

5753388fbfcde9e08d00ac9e2be5d881
SHA1

48e8a88ca75782489db9b5da0dff11f050a7a4e0
SHA256

d346665dc0a3c37256f313f6e9e41c254acf70c599d007f1391128c4b3771ce6
SHA512

483bfd819158b38e996780c3d59ee22b3a3d372d1cd38bfa68dc817370663da0978f259c836df42f5c2f5e3fd7ee9217d7f185664678c575c24a2f131226bad7

Score

10^/10

oski discovery infostealer spyware stealer

Malware Config

Extracted

Family

oski

C2

198.98.60.43

Signatures

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

Processes:

5753388fbfcde9e08d00ac9e2be5d881.exe

pid process

496 5753388fbfcde9e08d00ac9e2be5d881.exe
496 5753388fbfcde9e08d00ac9e2be5d881.exe
496 5753388fbfcde9e08d00ac9e2be5d881.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:

5753388fbfcde9e08d00ac9e2be5d881.exe

description pid process target process

PID 488 set thread context of 496 488 5753388fbfcde9e08d00ac9e2be5d881.exe 5753388fbfcde9e08d00ac9e2be5d881.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
496	5753388fbfcde9e08d00ac9e2be5d881.exe
496	5753388fbfcde9e08d00ac9e2be5d881.exe
496	5753388fbfcde9e08d00ac9e2be5d881.exe

description	pid	process	target process
PID 488 set thread context of 496	488	5753388fbfcde9e08d00ac9e2be5d881.exe	5753388fbfcde9e08d00ac9e2be5d881.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:

5753388fbfcde9e08d00ac9e2be5d881.exe

description	ioc	process
Key value queried	\REGISTRY\MACHINE\HARDWARE\DESCRIPTION\System\CentralProcessor\0\ProcessorNameString	5753388fbfcde9e08d00ac9e2be5d881.exe

Kills process with taskkill 1 IoCs
evasion

Processes:

taskkill.exe

pid process

3808 taskkill.exe
Suspicious behavior: EnumeratesProcesses 2 IoCs

Processes:

5753388fbfcde9e08d00ac9e2be5d881.exe

pid process

488 5753388fbfcde9e08d00ac9e2be5d881.exe
488 5753388fbfcde9e08d00ac9e2be5d881.exe
Suspicious use of AdjustPrivilegeToken 2 IoCs

Processes:

5753388fbfcde9e08d00ac9e2be5d881.exetaskkill.exe

description pid process

Token: SeDebugPrivilege 488 5753388fbfcde9e08d00ac9e2be5d881.exe
Token: SeDebugPrivilege 3808 taskkill.exe

pid	process
3808	taskkill.exe

pid	process
488	5753388fbfcde9e08d00ac9e2be5d881.exe
488	5753388fbfcde9e08d00ac9e2be5d881.exe

description	pid	process
Token: SeDebugPrivilege	488	5753388fbfcde9e08d00ac9e2be5d881.exe
Token: SeDebugPrivilege	3808	taskkill.exe

Suspicious use of WriteProcessMemory 15 IoCs

Processes:

5753388fbfcde9e08d00ac9e2be5d881.exe5753388fbfcde9e08d00ac9e2be5d881.execmd.exe

C:\Users\Admin\AppData\Local\Temp\5753388fbfcde9e08d00ac9e2be5d881.exe
"C:\Users\Admin\AppData\Local\Temp\5753388fbfcde9e08d00ac9e2be5d881.exe"
1⤵
- Suspicious use of SetThreadContext
- Suspicious behavior: EnumeratesProcesses
- Suspicious use of AdjustPrivilegeToken
- Suspicious use of WriteProcessMemory
PID:488

C:\Users\Admin\AppData\Local\Temp\5753388fbfcde9e08d00ac9e2be5d881.exe
C:\Users\Admin\AppData\Local\Temp\5753388fbfcde9e08d00ac9e2be5d881.exe
2⤵
- Loads dropped DLL
- Checks processor information in registry
- Suspicious use of WriteProcessMemory
PID:496

C:\Windows\SysWOW64\cmd.exe
"C:\Windows\System32\cmd.exe" /c taskkill /pid 496 & erase C:\Users\Admin\AppData\Local\Temp\5753388fbfcde9e08d00ac9e2be5d881.exe & RD /S /Q C:\\ProgramData\\245079314220720\\* & exit
3⤵
- Suspicious use of WriteProcessMemory
PID:636

C:\Windows\SysWOW64\taskkill.exe
taskkill /pid 496
4⤵
- Kills process with taskkill
- Suspicious use of AdjustPrivilegeToken
PID:3808

Network

MITRE ATT&CK Matrix ATT&CK 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

Exfiltration

Command and Control

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/488-121-0x00000000055D0000-0x00000000055EE000-memory.dmp

Filesize
120KB

Download
memory/488-119-0x0000000005510000-0x0000000005511000-memory.dmp

Filesize
4KB

Download
memory/488-120-0x00000000054E0000-0x00000000054E1000-memory.dmp

Filesize
4KB

Download
memory/488-114-0x0000000000430000-0x0000000000431000-memory.dmp

Filesize
4KB

Download
memory/488-118-0x0000000004DB0000-0x0000000004DBC000-memory.dmp

Filesize
48KB

Download
memory/488-117-0x0000000004D40000-0x0000000004D41000-memory.dmp

Filesize
4KB

Download
memory/488-116-0x0000000004DF0000-0x0000000004DF1000-memory.dmp

Filesize
4KB

Download
memory/496-122-0x0000000000400000-0x0000000000438000-memory.dmp

Filesize
224KB

Download
memory/496-123-0x000000000040717B-mapping.dmp

Download
memory/496-124-0x0000000000400000-0x0000000000438000-memory.dmp

Filesize
224KB

Download
memory/636-128-0x0000000000000000-mapping.dmp

Download
memory/3808-129-0x0000000000000000-mapping.dmp

Download

description	pid	process	target process
PID 488 wrote to memory of 496	488	5753388fbfcde9e08d00ac9e2be5d881.exe	5753388fbfcde9e08d00ac9e2be5d881.exe
PID 488 wrote to memory of 496	488	5753388fbfcde9e08d00ac9e2be5d881.exe	5753388fbfcde9e08d00ac9e2be5d881.exe
PID 488 wrote to memory of 496	488	5753388fbfcde9e08d00ac9e2be5d881.exe	5753388fbfcde9e08d00ac9e2be5d881.exe
PID 488 wrote to memory of 496	488	5753388fbfcde9e08d00ac9e2be5d881.exe	5753388fbfcde9e08d00ac9e2be5d881.exe
PID 488 wrote to memory of 496	488	5753388fbfcde9e08d00ac9e2be5d881.exe	5753388fbfcde9e08d00ac9e2be5d881.exe
PID 488 wrote to memory of 496	488	5753388fbfcde9e08d00ac9e2be5d881.exe	5753388fbfcde9e08d00ac9e2be5d881.exe
PID 488 wrote to memory of 496	488	5753388fbfcde9e08d00ac9e2be5d881.exe	5753388fbfcde9e08d00ac9e2be5d881.exe
PID 488 wrote to memory of 496	488	5753388fbfcde9e08d00ac9e2be5d881.exe	5753388fbfcde9e08d00ac9e2be5d881.exe
PID 488 wrote to memory of 496	488	5753388fbfcde9e08d00ac9e2be5d881.exe	5753388fbfcde9e08d00ac9e2be5d881.exe
PID 496 wrote to memory of 636	496	5753388fbfcde9e08d00ac9e2be5d881.exe	cmd.exe
PID 496 wrote to memory of 636	496	5753388fbfcde9e08d00ac9e2be5d881.exe	cmd.exe
PID 496 wrote to memory of 636	496	5753388fbfcde9e08d00ac9e2be5d881.exe	cmd.exe
PID 636 wrote to memory of 3808	636	cmd.exe	taskkill.exe
PID 636 wrote to memory of 3808	636	cmd.exe	taskkill.exe
PID 636 wrote to memory of 3808	636	cmd.exe	taskkill.exe

Analysis

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