oski | 62ff4acb82aa8f8e187d10029882cc2864f7a091bf1ff0a4ee1475119ba6ad9d

General

Target

h7tfR29LuPk1YuPJO199.exe
Size

869KB
MD5

93d1db10e708c676866a7cd1dba55b68
SHA1

eeb55b51a51ba0e0325397eeae08b332b5724b45
SHA256

62ff4acb82aa8f8e187d10029882cc2864f7a091bf1ff0a4ee1475119ba6ad9d
SHA512

07dcc951d562a37615abadbe9b778b83d51777d7d36bb54201cf11a308e1695844ce40b24054449ee190912e617620d389b5e1ee6d3fc21b1e1368f04f2a5eb0

Score

10^/10

oski discovery infostealer spyware stealer

Malware Config

Extracted

Family

oski

C2

31.210.21.181

Signatures

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

Processes:

h7tfR29LuPk1YuPJO199.exe

pid process

2220 h7tfR29LuPk1YuPJO199.exe
2220 h7tfR29LuPk1YuPJO199.exe
2220 h7tfR29LuPk1YuPJO199.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:

h7tfR29LuPk1YuPJO199.exe

description pid process target process

PID 856 set thread context of 2220 856 h7tfR29LuPk1YuPJO199.exe h7tfR29LuPk1YuPJO199.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:

h7tfR29LuPk1YuPJO199.exe

description ioc process

Key value queried \REGISTRY\MACHINE\HARDWARE\DESCRIPTION\System\CentralProcessor\0\ProcessorNameString h7tfR29LuPk1YuPJO199.exe
Kills process with taskkill 1 IoCs
evasion

Processes:

taskkill.exe

pid process

2120 taskkill.exe
Suspicious use of AdjustPrivilegeToken 1 IoCs

Processes:

taskkill.exe

description pid process

Token: SeDebugPrivilege 2120 taskkill.exe

pid	process
2220	h7tfR29LuPk1YuPJO199.exe
2220	h7tfR29LuPk1YuPJO199.exe
2220	h7tfR29LuPk1YuPJO199.exe

description	pid	process	target process
PID 856 set thread context of 2220	856	h7tfR29LuPk1YuPJO199.exe	h7tfR29LuPk1YuPJO199.exe

description	ioc	process
Key value queried	\REGISTRY\MACHINE\HARDWARE\DESCRIPTION\System\CentralProcessor\0\ProcessorNameString	h7tfR29LuPk1YuPJO199.exe

pid	process
2120	taskkill.exe

description	pid	process
Token: SeDebugPrivilege	2120	taskkill.exe

Suspicious use of WriteProcessMemory 15 IoCs

Processes:

h7tfR29LuPk1YuPJO199.exeh7tfR29LuPk1YuPJO199.execmd.exe

description	pid	process	target process
PID 856 wrote to memory of 2220	856	h7tfR29LuPk1YuPJO199.exe	h7tfR29LuPk1YuPJO199.exe
PID 856 wrote to memory of 2220	856	h7tfR29LuPk1YuPJO199.exe	h7tfR29LuPk1YuPJO199.exe
PID 856 wrote to memory of 2220	856	h7tfR29LuPk1YuPJO199.exe	h7tfR29LuPk1YuPJO199.exe
PID 856 wrote to memory of 2220	856	h7tfR29LuPk1YuPJO199.exe	h7tfR29LuPk1YuPJO199.exe
PID 856 wrote to memory of 2220	856	h7tfR29LuPk1YuPJO199.exe	h7tfR29LuPk1YuPJO199.exe
PID 856 wrote to memory of 2220	856	h7tfR29LuPk1YuPJO199.exe	h7tfR29LuPk1YuPJO199.exe
PID 856 wrote to memory of 2220	856	h7tfR29LuPk1YuPJO199.exe	h7tfR29LuPk1YuPJO199.exe
PID 856 wrote to memory of 2220	856	h7tfR29LuPk1YuPJO199.exe	h7tfR29LuPk1YuPJO199.exe
PID 856 wrote to memory of 2220	856	h7tfR29LuPk1YuPJO199.exe	h7tfR29LuPk1YuPJO199.exe
PID 2220 wrote to memory of 788	2220	h7tfR29LuPk1YuPJO199.exe	cmd.exe
PID 2220 wrote to memory of 788	2220	h7tfR29LuPk1YuPJO199.exe	cmd.exe
PID 2220 wrote to memory of 788	2220	h7tfR29LuPk1YuPJO199.exe	cmd.exe
PID 788 wrote to memory of 2120	788	cmd.exe	taskkill.exe
PID 788 wrote to memory of 2120	788	cmd.exe	taskkill.exe
PID 788 wrote to memory of 2120	788	cmd.exe	taskkill.exe

C:\Users\Admin\AppData\Local\Temp\h7tfR29LuPk1YuPJO199.exe
"C:\Users\Admin\AppData\Local\Temp\h7tfR29LuPk1YuPJO199.exe"
1⤵
- Suspicious use of SetThreadContext
- Suspicious use of WriteProcessMemory
PID:856

C:\Users\Admin\AppData\Local\Temp\h7tfR29LuPk1YuPJO199.exe
"C:\Users\Admin\AppData\Local\Temp\h7tfR29LuPk1YuPJO199.exe"
2⤵
- Loads dropped DLL
- Checks processor information in registry
- Suspicious use of WriteProcessMemory
PID:2220

C:\Windows\SysWOW64\cmd.exe
"C:\Windows\System32\cmd.exe" /c taskkill /pid 2220 & erase C:\Users\Admin\AppData\Local\Temp\h7tfR29LuPk1YuPJO199.exe & RD /S /Q C:\\ProgramData\\974273445370694\\* & exit
3⤵
- Suspicious use of WriteProcessMemory
PID:788

C:\Windows\SysWOW64\taskkill.exe
taskkill /pid 2220
4⤵
- Kills process with taskkill
- Suspicious use of AdjustPrivilegeToken
PID:2120

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/788-131-0x0000000000000000-mapping.dmp

Download
memory/856-123-0x0000000000EA0000-0x0000000000F1A000-memory.dmp

Filesize
488KB

Download
memory/856-118-0x00000000050B0000-0x00000000050B1000-memory.dmp

Filesize
4KB

Download
memory/856-121-0x0000000005220000-0x0000000005221000-memory.dmp

Filesize
4KB

Download
memory/856-122-0x00000000050A0000-0x00000000050AE000-memory.dmp

Filesize
56KB

Download
memory/856-114-0x0000000000680000-0x0000000000681000-memory.dmp

Filesize
4KB

Download
memory/856-124-0x0000000008260000-0x000000000829B000-memory.dmp

Filesize
236KB

Download
memory/856-116-0x0000000004F70000-0x0000000004F71000-memory.dmp

Filesize
4KB

Download
memory/856-117-0x0000000005510000-0x0000000005511000-memory.dmp

Filesize
4KB

Download
memory/856-120-0x0000000005010000-0x0000000005011000-memory.dmp

Filesize
4KB

Download
memory/856-119-0x0000000005010000-0x000000000550E000-memory.dmp

Filesize
5.0MB

Download
memory/2120-132-0x0000000000000000-mapping.dmp

Download
memory/2220-127-0x0000000000400000-0x0000000000438000-memory.dmp

Filesize
224KB

Download
memory/2220-126-0x000000000040717B-mapping.dmp

Download
memory/2220-125-0x0000000000400000-0x0000000000438000-memory.dmp

Filesize
224KB

Download

Analysis

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