oski | b1fb8aca24889f4446865d60a21b47b5214cebff2ee9f797ae49b7b3885b2cff

General

Target

CTYH 53069184.exe
Size

622KB
MD5

8f3fb2446099de27ca50c13ad0d80245
SHA1

04bf820780ced24814bf9a8ac4628f336a8cf596
SHA256

b1fb8aca24889f4446865d60a21b47b5214cebff2ee9f797ae49b7b3885b2cff
SHA512

79933bc3a0382f2417904955f1d4332f456a1ba72a30cddd406585096cdfd03dd6e545861bb4a1f6b5e9803588810e41f4b162d9378489b9bfedf4f3c7b1fe49

Score

10^/10

oski discovery infostealer spyware stealer suricata

Malware Config

Extracted

Family

oski

C2

tecnomedica.com.py

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 Vidar/Arkei/Megumin/Oski Stealer Data Exfil
suricata: ET MALWARE Vidar/Arkei/Megumin/Oski Stealer Data Exfil
suricata
Downloads MZ/PE file
Loads dropped DLL 3 IoCs

Processes:

CTYH 53069184.exe

pid process

1612 CTYH 53069184.exe
1612 CTYH 53069184.exe
1612 CTYH 53069184.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:

CTYH 53069184.exe

description pid process target process

PID 2748 set thread context of 1612 2748 CTYH 53069184.exe CTYH 53069184.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:

CTYH 53069184.exe

description ioc process

Key value queried \REGISTRY\MACHINE\HARDWARE\DESCRIPTION\System\CentralProcessor\0\ProcessorNameString CTYH 53069184.exe
Kills process with taskkill 1 IoCs
evasion

Processes:

taskkill.exe

pid process

1044 taskkill.exe
Suspicious behavior: EnumeratesProcesses 5 IoCs

Processes:

CTYH 53069184.exepowershell.exe

pid process

2748 CTYH 53069184.exe
2748 CTYH 53069184.exe
3680 powershell.exe
3680 powershell.exe
3680 powershell.exe
Suspicious use of AdjustPrivilegeToken 3 IoCs

Processes:

CTYH 53069184.exepowershell.exetaskkill.exe

description pid process

Token: SeDebugPrivilege 2748 CTYH 53069184.exe
Token: SeDebugPrivilege 3680 powershell.exe
Token: SeDebugPrivilege 1044 taskkill.exe

pid	process
1612	CTYH 53069184.exe
1612	CTYH 53069184.exe
1612	CTYH 53069184.exe

description	pid	process	target process
PID 2748 set thread context of 1612	2748	CTYH 53069184.exe	CTYH 53069184.exe

description	ioc	process
Key value queried	\REGISTRY\MACHINE\HARDWARE\DESCRIPTION\System\CentralProcessor\0\ProcessorNameString	CTYH 53069184.exe

pid	process
1044	taskkill.exe

pid	process
2748	CTYH 53069184.exe
2748	CTYH 53069184.exe
3680	powershell.exe
3680	powershell.exe
3680	powershell.exe

description	pid	process
Token: SeDebugPrivilege	2748	CTYH 53069184.exe
Token: SeDebugPrivilege	3680	powershell.exe
Token: SeDebugPrivilege	1044	taskkill.exe

Suspicious use of WriteProcessMemory 21 IoCs

Processes:

CTYH 53069184.exeCTYH 53069184.execmd.exe

description	pid	process	target process
PID 2748 wrote to memory of 3680	2748	CTYH 53069184.exe	powershell.exe
PID 2748 wrote to memory of 3680	2748	CTYH 53069184.exe	powershell.exe
PID 2748 wrote to memory of 3680	2748	CTYH 53069184.exe	powershell.exe
PID 2748 wrote to memory of 1516	2748	CTYH 53069184.exe	CTYH 53069184.exe
PID 2748 wrote to memory of 1516	2748	CTYH 53069184.exe	CTYH 53069184.exe
PID 2748 wrote to memory of 1516	2748	CTYH 53069184.exe	CTYH 53069184.exe
PID 2748 wrote to memory of 1612	2748	CTYH 53069184.exe	CTYH 53069184.exe
PID 2748 wrote to memory of 1612	2748	CTYH 53069184.exe	CTYH 53069184.exe
PID 2748 wrote to memory of 1612	2748	CTYH 53069184.exe	CTYH 53069184.exe
PID 2748 wrote to memory of 1612	2748	CTYH 53069184.exe	CTYH 53069184.exe
PID 2748 wrote to memory of 1612	2748	CTYH 53069184.exe	CTYH 53069184.exe
PID 2748 wrote to memory of 1612	2748	CTYH 53069184.exe	CTYH 53069184.exe
PID 2748 wrote to memory of 1612	2748	CTYH 53069184.exe	CTYH 53069184.exe
PID 2748 wrote to memory of 1612	2748	CTYH 53069184.exe	CTYH 53069184.exe
PID 2748 wrote to memory of 1612	2748	CTYH 53069184.exe	CTYH 53069184.exe
PID 1612 wrote to memory of 4040	1612	CTYH 53069184.exe	cmd.exe
PID 1612 wrote to memory of 4040	1612	CTYH 53069184.exe	cmd.exe
PID 1612 wrote to memory of 4040	1612	CTYH 53069184.exe	cmd.exe
PID 4040 wrote to memory of 1044	4040	cmd.exe	taskkill.exe
PID 4040 wrote to memory of 1044	4040	cmd.exe	taskkill.exe
PID 4040 wrote to memory of 1044	4040	cmd.exe	taskkill.exe

C:\Users\Admin\AppData\Local\Temp\CTYH 53069184.exe
"C:\Users\Admin\AppData\Local\Temp\CTYH 53069184.exe"
1⤵
- Suspicious use of SetThreadContext
- Suspicious behavior: EnumeratesProcesses
- Suspicious use of AdjustPrivilegeToken
- Suspicious use of WriteProcessMemory
PID:2748

C:\Windows\SysWOW64\WindowsPowerShell\v1.0\powershell.exe
"C:\Windows\System32\WindowsPowerShell\v1.0\powershell.exe" Add-MpPreference -ExclusionPath "C:\Users\Admin\AppData\Local\Temp\CTYH 53069184.exe"
2⤵
- Suspicious behavior: EnumeratesProcesses
- Suspicious use of AdjustPrivilegeToken
PID:3680

C:\Users\Admin\AppData\Local\Temp\CTYH 53069184.exe
"C:\Users\Admin\AppData\Local\Temp\CTYH 53069184.exe"
2⤵
PID:1516

C:\Users\Admin\AppData\Local\Temp\CTYH 53069184.exe
"C:\Users\Admin\AppData\Local\Temp\CTYH 53069184.exe"
2⤵
- Loads dropped DLL
- Checks processor information in registry
- Suspicious use of WriteProcessMemory
PID:1612

C:\Windows\SysWOW64\cmd.exe
"C:\Windows\System32\cmd.exe" /c taskkill /pid 1612 & erase C:\Users\Admin\AppData\Local\Temp\CTYH 53069184.exe & RD /S /Q C:\\ProgramData\\225051814618248\\* & exit
3⤵
- Suspicious use of WriteProcessMemory
PID:4040

C:\Windows\SysWOW64\taskkill.exe
taskkill /pid 1612
4⤵
- Kills process with taskkill
- Suspicious use of AdjustPrivilegeToken
PID:1044

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/1044-239-0x0000000000000000-mapping.dmp

Download
memory/1612-135-0x0000000000400000-0x0000000000438000-memory.dmp

Filesize
224KB

Download
memory/1612-130-0x000000000040717B-mapping.dmp

Download
memory/1612-129-0x0000000000400000-0x0000000000438000-memory.dmp

Filesize
224KB

Download
memory/2748-122-0x0000000004ED0000-0x00000000053CE000-memory.dmp

Filesize
5.0MB

Download
memory/2748-126-0x0000000007710000-0x0000000007775000-memory.dmp

Filesize
404KB

Download
memory/2748-125-0x0000000007570000-0x0000000007571000-memory.dmp

Filesize
4KB

Download
memory/2748-124-0x00000000053B0000-0x00000000053B6000-memory.dmp

Filesize
24KB

Download
memory/2748-123-0x0000000004EE0000-0x0000000004EE1000-memory.dmp

Filesize
4KB

Download
memory/2748-121-0x0000000004E10000-0x0000000004E11000-memory.dmp

Filesize
4KB

Download
memory/2748-120-0x00000000053D0000-0x00000000053D1000-memory.dmp

Filesize
4KB

Download
memory/2748-118-0x0000000000550000-0x0000000000551000-memory.dmp

Filesize
4KB

Download
memory/3680-137-0x0000000008210000-0x0000000008211000-memory.dmp

Filesize
4KB

Download
memory/3680-151-0x0000000009940000-0x0000000009973000-memory.dmp

Filesize
204KB

Download
memory/3680-136-0x00000000074C2000-0x00000000074C3000-memory.dmp

Filesize
4KB

Download
memory/3680-133-0x0000000007B00000-0x0000000007B01000-memory.dmp

Filesize
4KB

Download
memory/3680-138-0x00000000083B0000-0x00000000083B1000-memory.dmp

Filesize
4KB

Download
memory/3680-139-0x0000000008340000-0x0000000008341000-memory.dmp

Filesize
4KB

Download
memory/3680-140-0x0000000008420000-0x0000000008421000-memory.dmp

Filesize
4KB

Download
memory/3680-141-0x0000000008770000-0x0000000008771000-memory.dmp

Filesize
4KB

Download
memory/3680-142-0x0000000008C10000-0x0000000008C11000-memory.dmp

Filesize
4KB

Download
memory/3680-143-0x0000000008C60000-0x0000000008C61000-memory.dmp

Filesize
4KB

Download
memory/3680-144-0x0000000004F60000-0x0000000004F61000-memory.dmp

Filesize
4KB

Download
memory/3680-134-0x00000000074C0000-0x00000000074C1000-memory.dmp

Filesize
4KB

Download
memory/3680-158-0x0000000009920000-0x0000000009921000-memory.dmp

Filesize
4KB

Download
memory/3680-163-0x0000000009D10000-0x0000000009D11000-memory.dmp

Filesize
4KB

Download
memory/3680-164-0x000000007F250000-0x000000007F251000-memory.dmp

Filesize
4KB

Download
memory/3680-132-0x00000000073C0000-0x00000000073C1000-memory.dmp

Filesize
4KB

Download
memory/3680-128-0x0000000004F60000-0x0000000004F61000-memory.dmp

Filesize
4KB

Download
memory/3680-131-0x0000000004F60000-0x0000000004F61000-memory.dmp

Filesize
4KB

Download
memory/3680-168-0x0000000009E70000-0x0000000009E71000-memory.dmp

Filesize
4KB

Download
memory/3680-234-0x00000000074C3000-0x00000000074C4000-memory.dmp

Filesize
4KB

Download
memory/3680-127-0x0000000000000000-mapping.dmp

Download
memory/4040-238-0x0000000000000000-mapping.dmp

Download

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