oski | a96d0e16ff2f1bb99d82f6232b48e8d40d879906a0dd2870985359d19e82ff6e

General

Target

42601ff8d41599bb0a61bed4bddc468c.exe
Size

882KB
MD5

42601ff8d41599bb0a61bed4bddc468c
SHA1

73ca2dd8e1a2d000447dfc3ea6cd3c84eb7f3490
SHA256

a96d0e16ff2f1bb99d82f6232b48e8d40d879906a0dd2870985359d19e82ff6e
SHA512

011e2c2c5fee106c35cd9a764b37da79f459b6488c5d1ca12f9001666e8d0547d08948f4a7dec219ae5090644f3db87b9817939976e002a55cbf7c4b9665834c

Score

10^/10

oski discovery infostealer spyware stealer

Malware Config

Extracted

Family

oski

C2

ra.adriansbruce.com

Signatures

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

Deletes itself 1 IoCs

pid	Process
1288	cmd.exe

Loads dropped DLL 3 IoCs

pid	Process
1480	42601ff8d41599bb0a61bed4bddc468c.exe
1480	42601ff8d41599bb0a61bed4bddc468c.exe
1480	42601ff8d41599bb0a61bed4bddc468c.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 852 set thread context of 1480	852	42601ff8d41599bb0a61bed4bddc468c.exe	29

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	42601ff8d41599bb0a61bed4bddc468c.exe

Creates scheduled task(s) 1 TTPs 1 IoCs

Schtasks is often used by malware for persistence or to perform post-infection execution.

persistence

Scheduled Task

T1053

pid	Process
964	schtasks.exe

Kills process with taskkill 1 IoCs

evasion

pid	Process
1220	taskkill.exe

Suspicious use of AdjustPrivilegeToken 2 IoCs

description	pid	Process
Token: SeDebugPrivilege	852	42601ff8d41599bb0a61bed4bddc468c.exe
Token: SeDebugPrivilege	1220	taskkill.exe

Suspicious use of WriteProcessMemory 22 IoCs

description	pid	Process	procid_target
PID 852 wrote to memory of 964	852	42601ff8d41599bb0a61bed4bddc468c.exe	27
PID 852 wrote to memory of 964	852	42601ff8d41599bb0a61bed4bddc468c.exe	27
PID 852 wrote to memory of 964	852	42601ff8d41599bb0a61bed4bddc468c.exe	27
PID 852 wrote to memory of 964	852	42601ff8d41599bb0a61bed4bddc468c.exe	27
PID 852 wrote to memory of 1480	852	42601ff8d41599bb0a61bed4bddc468c.exe	29
PID 852 wrote to memory of 1480	852	42601ff8d41599bb0a61bed4bddc468c.exe	29
PID 852 wrote to memory of 1480	852	42601ff8d41599bb0a61bed4bddc468c.exe	29
PID 852 wrote to memory of 1480	852	42601ff8d41599bb0a61bed4bddc468c.exe	29
PID 852 wrote to memory of 1480	852	42601ff8d41599bb0a61bed4bddc468c.exe	29
PID 852 wrote to memory of 1480	852	42601ff8d41599bb0a61bed4bddc468c.exe	29
PID 852 wrote to memory of 1480	852	42601ff8d41599bb0a61bed4bddc468c.exe	29
PID 852 wrote to memory of 1480	852	42601ff8d41599bb0a61bed4bddc468c.exe	29
PID 852 wrote to memory of 1480	852	42601ff8d41599bb0a61bed4bddc468c.exe	29
PID 852 wrote to memory of 1480	852	42601ff8d41599bb0a61bed4bddc468c.exe	29
PID 1480 wrote to memory of 1288	1480	42601ff8d41599bb0a61bed4bddc468c.exe	32
PID 1480 wrote to memory of 1288	1480	42601ff8d41599bb0a61bed4bddc468c.exe	32
PID 1480 wrote to memory of 1288	1480	42601ff8d41599bb0a61bed4bddc468c.exe	32
PID 1480 wrote to memory of 1288	1480	42601ff8d41599bb0a61bed4bddc468c.exe	32
PID 1288 wrote to memory of 1220	1288	cmd.exe	34
PID 1288 wrote to memory of 1220	1288	cmd.exe	34
PID 1288 wrote to memory of 1220	1288	cmd.exe	34
PID 1288 wrote to memory of 1220	1288	cmd.exe	34

C:\Users\Admin\AppData\Local\Temp\42601ff8d41599bb0a61bed4bddc468c.exe
"C:\Users\Admin\AppData\Local\Temp\42601ff8d41599bb0a61bed4bddc468c.exe"
1⤵
- Suspicious use of SetThreadContext
- Suspicious use of AdjustPrivilegeToken
- Suspicious use of WriteProcessMemory
PID:852
- C:\Windows\SysWOW64\schtasks.exe
  "C:\Windows\System32\schtasks.exe" /Create /TN "Updates\YwgdZptl" /XML "C:\Users\Admin\AppData\Local\Temp\tmp7FCB.tmp"
  2⤵
  - Creates scheduled task(s)
  PID:964
- C:\Users\Admin\AppData\Local\Temp\42601ff8d41599bb0a61bed4bddc468c.exe
  "{path}"
  2⤵
  - Loads dropped DLL
  - Checks processor information in registry
  - Suspicious use of WriteProcessMemory
  PID:1480
- - C:\Windows\SysWOW64\cmd.exe
    "C:\Windows\System32\cmd.exe" /c taskkill /pid 1480 & erase C:\Users\Admin\AppData\Local\Temp\42601ff8d41599bb0a61bed4bddc468c.exe & RD /S /Q C:\\ProgramData\\171472350344450\\* & exit
    3⤵
    - Deletes itself
    - Suspicious use of WriteProcessMemory
    PID:1288
  - - C:\Windows\SysWOW64\taskkill.exe
      taskkill /pid 1480
      4⤵
      Kills process with taskkill
      Suspicious use of AdjustPrivilegeToken
      PID:1220

Network

MITRE ATT&CK Enterprise v6

Initial Access

Execution

Scheduled Task

1

T1053

Persistence

Scheduled Task

1

T1053

Privilege Escalation

Scheduled Task

1

T1053

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

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Downloads

C:\Users\Admin\AppData\Local\Temp\tmp7FCB.tmp

Filesize
1KB

MD5
e6c2121bd5089ddaeaf753803c3c7192

SHA1
8305e524165827413694de859bf8ec7fb3a44c47

SHA256
d40c023ffcf73b2ac1111e4dc4fcc5fabe5ecf1556d2ed3bfc139ff6f341d797

SHA512
4d0ae4875d428d304b9e96c648c5bf0bd76347bc2cce530513b1a06a74531d732f63e00a02bcf82ac6c59304c9c8a35ac4a515b0f8943d58478f670bdaca79da

Download Submit
\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/852-72-0x0000000074610000-0x0000000074BBB000-memory.dmp

Filesize
5.7MB

Download
memory/852-55-0x0000000074610000-0x0000000074BBB000-memory.dmp

Filesize
5.7MB

Download
memory/852-56-0x0000000074610000-0x0000000074BBB000-memory.dmp

Filesize
5.7MB

Download
memory/852-54-0x0000000076021000-0x0000000076023000-memory.dmp

Filesize
8KB

Download
memory/1480-59-0x0000000000400000-0x0000000000438000-memory.dmp

Filesize
224KB

Download
memory/1480-71-0x0000000000400000-0x0000000000438000-memory.dmp

Filesize
224KB

Download
memory/1480-74-0x0000000000400000-0x0000000000438000-memory.dmp

Filesize
224KB

Download
memory/1480-68-0x0000000000400000-0x0000000000438000-memory.dmp

Filesize
224KB

Download
memory/1480-66-0x0000000000400000-0x0000000000438000-memory.dmp

Filesize
224KB

Download
memory/1480-64-0x0000000000400000-0x0000000000438000-memory.dmp

Filesize
224KB

Download
memory/1480-62-0x0000000000400000-0x0000000000438000-memory.dmp

Filesize
224KB

Download
memory/1480-79-0x0000000000400000-0x0000000000438000-memory.dmp

Filesize
224KB

Download
memory/1480-60-0x0000000000400000-0x0000000000438000-memory.dmp

Filesize
224KB

Download

Analysis

Sharing

General

Malware Config

Extracted

Signatures

Processes

Network

MITRE ATT&CK Enterprise v6

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Downloads