oski | 487723e00df8d7f8bfdb57614fa32001f2addc6be9576005b04f1dff53710634

General

Target

PURCHASE ORDER.pdf.exe
Size

273KB
MD5

3304d0b6d7ce20ce511c4a90b76f3a3c
SHA1

88195ea442c55fcf8e735c5525498e0b63107f0c
SHA256

487723e00df8d7f8bfdb57614fa32001f2addc6be9576005b04f1dff53710634
SHA512

130d5f5adbc5bcc4f64116e851249de7271c6ac34f706afe7e2aa9be62bfa680471c17c947806324ed1ab528cec511172f46b86ab2e7134ad4f44c948b286034
SSDEEP

6144:EVP0JqJ1pemf6mr5GRNoQ0kk8MMXSZ7Vl9Fnog3Fpc9QI/3We:m0JqJe46fRNC3qSNf3ndrW/3We

Score

10^/10

oski discovery infostealer persistence spyware stealer

Malware Config

Extracted

Family

oski

C2

�&C

v.oteqprojects.co.in

Signatures

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

Checks computer location settings 2 TTPs 1 IoCs

Looks up country code configured in the registry, likely geofence.

Query Registry

T1012

System Information Discovery

T1082

Processes:

PURCHASE ORDER.pdf.exe

description	ioc	process
Key value queried	\REGISTRY\USER\S-1-5-21-2891029575-1462575-1165213807-1000\Control Panel\International\Geo\Nation	PURCHASE ORDER.pdf.exe

Loads dropped DLL 3 IoCs

Processes:

PURCHASE ORDER.pdf.exe

pid process

2436 PURCHASE ORDER.pdf.exe
2436 PURCHASE ORDER.pdf.exe
2436 PURCHASE ORDER.pdf.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

pid	process
2436	PURCHASE ORDER.pdf.exe
2436	PURCHASE ORDER.pdf.exe
2436	PURCHASE ORDER.pdf.exe

Adds Run key to start application 2 TTPs 1 IoCs

persistence

Registry Run Keys / Startup Folder

T1060

Modify Registry

T1112

Processes:

PURCHASE ORDER.pdf.exe

description	ioc	process
Set value (str)	\REGISTRY\USER\S-1-5-21-2891029575-1462575-1165213807-1000\SOFTWARE\Microsoft\Windows\CurrentVersion\Run\windows dll = "C:\\Users\\Admin\\AppData\\Local\\Temp\\file.exe"	PURCHASE ORDER.pdf.exe

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 2 IoCs

Processes:

PURCHASE ORDER.pdf.exePURCHASE ORDER.pdf.exe

description	pid	process	target process
PID 4772 set thread context of 1224	4772	PURCHASE ORDER.pdf.exe	PURCHASE ORDER.pdf.exe
PID 1224 set thread context of 2436	1224	PURCHASE ORDER.pdf.exe	PURCHASE ORDER.pdf.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:

PURCHASE ORDER.pdf.exe

description ioc process

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

Processes:

taskkill.exe

pid process

3008 taskkill.exe
Suspicious use of AdjustPrivilegeToken 1 IoCs

Processes:

taskkill.exe

description pid process

Token: SeDebugPrivilege 3008 taskkill.exe

description	ioc	process
Key value queried	\REGISTRY\MACHINE\HARDWARE\DESCRIPTION\System\CentralProcessor\0\ProcessorNameString	PURCHASE ORDER.pdf.exe

pid	process
3008	taskkill.exe

description	pid	process
Token: SeDebugPrivilege	3008	taskkill.exe

Suspicious use of WriteProcessMemory 26 IoCs

Processes:

PURCHASE ORDER.pdf.exePURCHASE ORDER.pdf.exePURCHASE ORDER.pdf.execmd.exe

description	pid	process	target process
PID 4772 wrote to memory of 1224	4772	PURCHASE ORDER.pdf.exe	PURCHASE ORDER.pdf.exe
PID 4772 wrote to memory of 1224	4772	PURCHASE ORDER.pdf.exe	PURCHASE ORDER.pdf.exe
PID 4772 wrote to memory of 1224	4772	PURCHASE ORDER.pdf.exe	PURCHASE ORDER.pdf.exe
PID 4772 wrote to memory of 1224	4772	PURCHASE ORDER.pdf.exe	PURCHASE ORDER.pdf.exe
PID 4772 wrote to memory of 1224	4772	PURCHASE ORDER.pdf.exe	PURCHASE ORDER.pdf.exe
PID 4772 wrote to memory of 1224	4772	PURCHASE ORDER.pdf.exe	PURCHASE ORDER.pdf.exe
PID 4772 wrote to memory of 1224	4772	PURCHASE ORDER.pdf.exe	PURCHASE ORDER.pdf.exe
PID 4772 wrote to memory of 1224	4772	PURCHASE ORDER.pdf.exe	PURCHASE ORDER.pdf.exe
PID 4772 wrote to memory of 1224	4772	PURCHASE ORDER.pdf.exe	PURCHASE ORDER.pdf.exe
PID 4772 wrote to memory of 1224	4772	PURCHASE ORDER.pdf.exe	PURCHASE ORDER.pdf.exe
PID 4772 wrote to memory of 1224	4772	PURCHASE ORDER.pdf.exe	PURCHASE ORDER.pdf.exe
PID 1224 wrote to memory of 2436	1224	PURCHASE ORDER.pdf.exe	PURCHASE ORDER.pdf.exe
PID 1224 wrote to memory of 2436	1224	PURCHASE ORDER.pdf.exe	PURCHASE ORDER.pdf.exe
PID 1224 wrote to memory of 2436	1224	PURCHASE ORDER.pdf.exe	PURCHASE ORDER.pdf.exe
PID 1224 wrote to memory of 2436	1224	PURCHASE ORDER.pdf.exe	PURCHASE ORDER.pdf.exe
PID 1224 wrote to memory of 2436	1224	PURCHASE ORDER.pdf.exe	PURCHASE ORDER.pdf.exe
PID 1224 wrote to memory of 2436	1224	PURCHASE ORDER.pdf.exe	PURCHASE ORDER.pdf.exe
PID 1224 wrote to memory of 2436	1224	PURCHASE ORDER.pdf.exe	PURCHASE ORDER.pdf.exe
PID 1224 wrote to memory of 2436	1224	PURCHASE ORDER.pdf.exe	PURCHASE ORDER.pdf.exe
PID 1224 wrote to memory of 2436	1224	PURCHASE ORDER.pdf.exe	PURCHASE ORDER.pdf.exe
PID 2436 wrote to memory of 3736	2436	PURCHASE ORDER.pdf.exe	cmd.exe
PID 2436 wrote to memory of 3736	2436	PURCHASE ORDER.pdf.exe	cmd.exe
PID 2436 wrote to memory of 3736	2436	PURCHASE ORDER.pdf.exe	cmd.exe
PID 3736 wrote to memory of 3008	3736	cmd.exe	taskkill.exe
PID 3736 wrote to memory of 3008	3736	cmd.exe	taskkill.exe
PID 3736 wrote to memory of 3008	3736	cmd.exe	taskkill.exe

C:\Users\Admin\AppData\Local\Temp\PURCHASE ORDER.pdf.exe
"C:\Users\Admin\AppData\Local\Temp\PURCHASE ORDER.pdf.exe"
1⤵
- Suspicious use of SetThreadContext
- Suspicious use of WriteProcessMemory
PID:4772

C:\Users\Admin\AppData\Local\Temp\PURCHASE ORDER.pdf.exe
"C:\Users\Admin\AppData\Local\Temp\PURCHASE ORDER.pdf.exe"
2⤵
- Adds Run key to start application
- Suspicious use of SetThreadContext
- Suspicious use of WriteProcessMemory
PID:1224

C:\Users\Admin\AppData\Local\Temp\PURCHASE ORDER.pdf.exe
"C:\Users\Admin\AppData\Local\Temp\PURCHASE ORDER.pdf.exe"
3⤵
- Checks computer location settings
- Loads dropped DLL
- Checks processor information in registry
- Suspicious use of WriteProcessMemory
PID:2436

C:\Windows\SysWOW64\cmd.exe
"C:\Windows\System32\cmd.exe" /c taskkill /pid 2436 & erase C:\Users\Admin\AppData\Local\Temp\PURCHASE ORDER.pdf.exe & RD /S /Q C:\\ProgramData\\017792631176428\\* & exit
4⤵
- Suspicious use of WriteProcessMemory
PID:3736

C:\Windows\SysWOW64\taskkill.exe
taskkill /pid 2436
5⤵
- Kills process with taskkill
- Suspicious use of AdjustPrivilegeToken
PID:3008

Network

MITRE ATT&CK Matrix ATT&CK v6

Initial Access

Execution

Persistence

Registry Run Keys / Startup Folder

1

T1060

Privilege Escalation

Defense Evasion

Modify Registry

1

T1112

Credential Access

Credentials in Files

2

T1081

Discovery

Query Registry

3

T1012

System Information Discovery

3

T1082

Lateral Movement

Collection

Data from Local System

2

T1005

Exfiltration

Command and Control

Impact

Replay Monitor

Loading Replay Monitor...

Downloads

C:\ProgramData\mozglue.dll
Filesize
133KB

MD5
8f73c08a9660691143661bf7332c3c27

SHA1
37fa65dd737c50fda710fdbde89e51374d0c204a

SHA256
3fe6b1c54b8cf28f571e0c5d6636b4069a8ab00b4f11dd842cfec00691d0c9cd

SHA512
0042ecf9b3571bb5eba2de893e8b2371df18f7c5a589f52ee66e4bfbaa15a5b8b7cc6a155792aaa8988528c27196896d5e82e1751c998bacea0d92395f66ad89

Download Submit
C:\ProgramData\nss3.dll
Filesize
1.2MB

MD5
bfac4e3c5908856ba17d41edcd455a51

SHA1
8eec7e888767aa9e4cca8ff246eb2aacb9170428

SHA256
e2935b5b28550d47dc971f456d6961f20d1633b4892998750140e0eaa9ae9d78

SHA512
2565bab776c4d732ffb1f9b415992a4c65b81bcd644a9a1df1333a269e322925fc1df4f76913463296efd7c88ef194c3056de2f1ca1357d7b5fe5ff0da877a66

Download Submit
C:\ProgramData\sqlite3.dll
Filesize
630KB

MD5
e477a96c8f2b18d6b5c27bde49c990bf

SHA1
e980c9bf41330d1e5bd04556db4646a0210f7409

SHA256
16574f51785b0e2fc29c2c61477eb47bb39f714829999511dc8952b43ab17660

SHA512
335a86268e7c0e568b1c30981ec644e6cd332e66f96d2551b58a82515316693c1859d87b4f4b7310cf1ac386cee671580fdd999c3bcb23acf2c2282c01c8798c

Download Submit
memory/1224-132-0x0000000000000000-mapping.dmp

Download
memory/1224-133-0x0000000000400000-0x000000000043A000-memory.dmp

Filesize
232KB

Download
memory/1224-135-0x0000000000400000-0x000000000043A000-memory.dmp

Filesize
232KB

Download
memory/1224-139-0x0000000000400000-0x000000000043A000-memory.dmp

Filesize
232KB

Download
memory/2436-141-0x0000000000400000-0x0000000000438000-memory.dmp

Filesize
224KB

Download
memory/2436-140-0x0000000000400000-0x0000000000438000-memory.dmp

Filesize
224KB

Download
memory/2436-138-0x0000000000400000-0x0000000000438000-memory.dmp

Filesize
224KB

Download
memory/2436-137-0x0000000000400000-0x0000000000438000-memory.dmp

Filesize
224KB

Download
memory/2436-136-0x0000000000000000-mapping.dmp

Download
memory/2436-145-0x0000000000400000-0x0000000000438000-memory.dmp

Filesize
224KB

Download
memory/2436-147-0x0000000000400000-0x0000000000438000-memory.dmp

Filesize
224KB

Download
memory/3008-148-0x0000000000000000-mapping.dmp

Download
memory/3736-146-0x0000000000000000-mapping.dmp

Download

Analysis

Sharing

General

Malware Config

Extracted

Signatures

Processes

Network

MITRE ATT&CK Matrix ATT&CK v6

Replay Monitor

Loading Replay Monitor...

Downloads