oski | 9bafab21d172a1a4c7cc88eb44ca8292a8f96f812d7b4c71b706479f22690b7a

General

Target

DOC98374933_JULY2021.exe
Size

1.1MB
MD5

7cdabce07469c95df2bfe4bb692757d5
SHA1

be7905986d224b15517c5b41d4fc30fec309bd8e
SHA256

242acd2bd4415b211de8afd058570aac478e1c257d31e908a2823b8fb3788ede
SHA512

15fb71bf0912a3083590c454eacb37ea1e8954d2ce63de1910073192d767ca48ffd0a7192cb095799461a97ce680751bff30f59e5815c327cd9c767322fdc060

Score

10^/10

oski discovery infostealer spyware stealer

Malware Config

Extracted

Family

oski

C2

kckark.xyz

Signatures

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

Processes:

DOC98374933_JULY2021.exe

pid process

3668 DOC98374933_JULY2021.exe
3668 DOC98374933_JULY2021.exe
3668 DOC98374933_JULY2021.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:

DOC98374933_JULY2021.exe

description pid process target process

PID 580 set thread context of 3668 580 DOC98374933_JULY2021.exe DOC98374933_JULY2021.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:

DOC98374933_JULY2021.exe

description ioc process

Key value queried \REGISTRY\MACHINE\HARDWARE\DESCRIPTION\System\CentralProcessor\0\ProcessorNameString DOC98374933_JULY2021.exe
Kills process with taskkill 1 IoCs
evasion

Processes:

taskkill.exe

pid process

1012 taskkill.exe
Suspicious behavior: EnumeratesProcesses 2 IoCs

Processes:

DOC98374933_JULY2021.exe

pid process

580 DOC98374933_JULY2021.exe
580 DOC98374933_JULY2021.exe
Suspicious use of AdjustPrivilegeToken 2 IoCs

Processes:

DOC98374933_JULY2021.exetaskkill.exe

description pid process

Token: SeDebugPrivilege 580 DOC98374933_JULY2021.exe
Token: SeDebugPrivilege 1012 taskkill.exe

pid	process
3668	DOC98374933_JULY2021.exe
3668	DOC98374933_JULY2021.exe
3668	DOC98374933_JULY2021.exe

description	pid	process	target process
PID 580 set thread context of 3668	580	DOC98374933_JULY2021.exe	DOC98374933_JULY2021.exe

description	ioc	process
Key value queried	\REGISTRY\MACHINE\HARDWARE\DESCRIPTION\System\CentralProcessor\0\ProcessorNameString	DOC98374933_JULY2021.exe

pid	process
1012	taskkill.exe

pid	process
580	DOC98374933_JULY2021.exe
580	DOC98374933_JULY2021.exe

description	pid	process
Token: SeDebugPrivilege	580	DOC98374933_JULY2021.exe
Token: SeDebugPrivilege	1012	taskkill.exe

Suspicious use of WriteProcessMemory 18 IoCs

Processes:

DOC98374933_JULY2021.exeDOC98374933_JULY2021.execmd.exe

description	pid	process	target process
PID 580 wrote to memory of 3356	580	DOC98374933_JULY2021.exe	DOC98374933_JULY2021.exe
PID 580 wrote to memory of 3356	580	DOC98374933_JULY2021.exe	DOC98374933_JULY2021.exe
PID 580 wrote to memory of 3356	580	DOC98374933_JULY2021.exe	DOC98374933_JULY2021.exe
PID 580 wrote to memory of 3668	580	DOC98374933_JULY2021.exe	DOC98374933_JULY2021.exe
PID 580 wrote to memory of 3668	580	DOC98374933_JULY2021.exe	DOC98374933_JULY2021.exe
PID 580 wrote to memory of 3668	580	DOC98374933_JULY2021.exe	DOC98374933_JULY2021.exe
PID 580 wrote to memory of 3668	580	DOC98374933_JULY2021.exe	DOC98374933_JULY2021.exe
PID 580 wrote to memory of 3668	580	DOC98374933_JULY2021.exe	DOC98374933_JULY2021.exe
PID 580 wrote to memory of 3668	580	DOC98374933_JULY2021.exe	DOC98374933_JULY2021.exe
PID 580 wrote to memory of 3668	580	DOC98374933_JULY2021.exe	DOC98374933_JULY2021.exe
PID 580 wrote to memory of 3668	580	DOC98374933_JULY2021.exe	DOC98374933_JULY2021.exe
PID 580 wrote to memory of 3668	580	DOC98374933_JULY2021.exe	DOC98374933_JULY2021.exe
PID 3668 wrote to memory of 644	3668	DOC98374933_JULY2021.exe	cmd.exe
PID 3668 wrote to memory of 644	3668	DOC98374933_JULY2021.exe	cmd.exe
PID 3668 wrote to memory of 644	3668	DOC98374933_JULY2021.exe	cmd.exe
PID 644 wrote to memory of 1012	644	cmd.exe	taskkill.exe
PID 644 wrote to memory of 1012	644	cmd.exe	taskkill.exe
PID 644 wrote to memory of 1012	644	cmd.exe	taskkill.exe

C:\Users\Admin\AppData\Local\Temp\DOC98374933_JULY2021.exe
"C:\Users\Admin\AppData\Local\Temp\DOC98374933_JULY2021.exe"
1⤵
- Suspicious use of SetThreadContext
- Suspicious behavior: EnumeratesProcesses
- Suspicious use of AdjustPrivilegeToken
- Suspicious use of WriteProcessMemory
PID:580

C:\Users\Admin\AppData\Local\Temp\DOC98374933_JULY2021.exe
"C:\Users\Admin\AppData\Local\Temp\DOC98374933_JULY2021.exe"
2⤵
PID:3356

C:\Users\Admin\AppData\Local\Temp\DOC98374933_JULY2021.exe
"C:\Users\Admin\AppData\Local\Temp\DOC98374933_JULY2021.exe"
2⤵
- Loads dropped DLL
- Checks processor information in registry
- Suspicious use of WriteProcessMemory
PID:3668

C:\Windows\SysWOW64\cmd.exe
"C:\Windows\System32\cmd.exe" /c taskkill /pid 3668 & erase C:\Users\Admin\AppData\Local\Temp\DOC98374933_JULY2021.exe & RD /S /Q C:\\ProgramData\\025628022771807\\* & exit
3⤵
- Suspicious use of WriteProcessMemory
PID:644

C:\Windows\SysWOW64\taskkill.exe
taskkill /pid 3668
4⤵
- Kills process with taskkill
- Suspicious use of AdjustPrivilegeToken
PID:1012

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/580-123-0x0000000008200000-0x000000000827D000-memory.dmp

Filesize
500KB

Download
memory/580-118-0x0000000004BC0000-0x0000000004BC1000-memory.dmp

Filesize
4KB

Download
memory/580-120-0x0000000004A60000-0x0000000004A61000-memory.dmp

Filesize
4KB

Download
memory/580-121-0x0000000004D20000-0x0000000004D21000-memory.dmp

Filesize
4KB

Download
memory/580-122-0x0000000008030000-0x000000000804B000-memory.dmp

Filesize
108KB

Download
memory/580-114-0x0000000000120000-0x0000000000121000-memory.dmp

Filesize
4KB

Download
memory/580-124-0x00000000080A0000-0x00000000080D8000-memory.dmp

Filesize
224KB

Download
memory/580-116-0x0000000004A80000-0x0000000004A81000-memory.dmp

Filesize
4KB

Download
memory/580-117-0x0000000005020000-0x0000000005021000-memory.dmp

Filesize
4KB

Download
memory/580-119-0x00000000049A0000-0x0000000004A3C000-memory.dmp

Filesize
624KB

Download
memory/644-131-0x0000000000000000-mapping.dmp

Download
memory/1012-132-0x0000000000000000-mapping.dmp

Download
memory/3668-127-0x0000000000400000-0x0000000000438000-memory.dmp

Filesize
224KB

Download
memory/3668-126-0x000000000040717B-mapping.dmp

Download
memory/3668-125-0x0000000000400000-0x0000000000438000-memory.dmp

Filesize
224KB

Download

Analysis

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