oski | 18cfa8c68fe25199694faf0d2e9fe0fe86e872b1c20620098a68309ade161000

General

Target

IMG_578_60_28_61XLS.exe
Size

560KB
MD5

5ea03c09bf25d3d79ca5a936a18c0ae9
SHA1

13806150e3063f266b2fa752a517a4dff3bea533
SHA256

18cfa8c68fe25199694faf0d2e9fe0fe86e872b1c20620098a68309ade161000
SHA512

2c15022a942ba5dc97425c614972fda775645bf01c9b9a063b0aae5f3dda5da16304016c9e4598aff70af887ecadd1946f34b18d43d82fa08ab31c8ab9ae2ab3

Score

10^/10

oski discovery infostealer persistence spyware stealer

Malware Config

Extracted

Family

oski

C2

novget.com

Signatures

Modifies WinLogon for persistence 2 TTPs 1 IoCs

persistence

Winlogon Helper DLL

T1004

Modify Registry

T1112

Processes:

IMG_578_60_28_61XLS.exe

description	ioc	process
Set value (str)	\REGISTRY\USER\S-1-5-21-2513283230-931923277-594887482-1000\Software\Microsoft\Windows NT\CurrentVersion\Winlogon\Shell = "explorer.exe,\"C:\\Users\\Admin\\AppData\\Roaming\\chrom.exe\","	IMG_578_60_28_61XLS.exe

Oski
Oski is an infostealer targeting browser data, crypto wallets.
infostealer oski
Downloads MZ/PE file
Deletes itself 1 IoCs

Processes:

cmd.exe

pid process

892 cmd.exe
Loads dropped DLL 5 IoCs

Processes:

IMG_578_60_28_61XLS.exe

pid process

392 IMG_578_60_28_61XLS.exe
392 IMG_578_60_28_61XLS.exe
392 IMG_578_60_28_61XLS.exe
392 IMG_578_60_28_61XLS.exe
392 IMG_578_60_28_61XLS.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:

IMG_578_60_28_61XLS.exe

description pid process target process

PID 1208 set thread context of 392 1208 IMG_578_60_28_61XLS.exe IMG_578_60_28_61XLS.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:

IMG_578_60_28_61XLS.exe

description ioc process

Key value queried \REGISTRY\MACHINE\HARDWARE\DESCRIPTION\System\CentralProcessor\0\ProcessorNameString IMG_578_60_28_61XLS.exe
Kills process with taskkill 1 IoCs
evasion

Processes:

taskkill.exe

pid process

2028 taskkill.exe
Suspicious behavior: EnumeratesProcesses 4 IoCs

Processes:

IMG_578_60_28_61XLS.exepowershell.exe

pid process

1208 IMG_578_60_28_61XLS.exe
1208 IMG_578_60_28_61XLS.exe
1708 powershell.exe
1708 powershell.exe

pid	process
892	cmd.exe

pid	process
392	IMG_578_60_28_61XLS.exe
392	IMG_578_60_28_61XLS.exe
392	IMG_578_60_28_61XLS.exe
392	IMG_578_60_28_61XLS.exe
392	IMG_578_60_28_61XLS.exe

description	pid	process	target process
PID 1208 set thread context of 392	1208	IMG_578_60_28_61XLS.exe	IMG_578_60_28_61XLS.exe

description	ioc	process
Key value queried	\REGISTRY\MACHINE\HARDWARE\DESCRIPTION\System\CentralProcessor\0\ProcessorNameString	IMG_578_60_28_61XLS.exe

pid	process
2028	taskkill.exe

pid	process
1208	IMG_578_60_28_61XLS.exe
1208	IMG_578_60_28_61XLS.exe
1708	powershell.exe
1708	powershell.exe

Suspicious use of AdjustPrivilegeToken 3 IoCs

Processes:

IMG_578_60_28_61XLS.exepowershell.exetaskkill.exe

description	pid	process
Token: SeDebugPrivilege	1208	IMG_578_60_28_61XLS.exe
Token: SeDebugPrivilege	1708	powershell.exe
Token: SeDebugPrivilege	2028	taskkill.exe

Suspicious use of WriteProcessMemory 25 IoCs

Processes:

IMG_578_60_28_61XLS.exeIMG_578_60_28_61XLS.execmd.exe

description	pid	process	target process
PID 1208 wrote to memory of 1708	1208	IMG_578_60_28_61XLS.exe	powershell.exe
PID 1208 wrote to memory of 1708	1208	IMG_578_60_28_61XLS.exe	powershell.exe
PID 1208 wrote to memory of 1708	1208	IMG_578_60_28_61XLS.exe	powershell.exe
PID 1208 wrote to memory of 1708	1208	IMG_578_60_28_61XLS.exe	powershell.exe
PID 1208 wrote to memory of 392	1208	IMG_578_60_28_61XLS.exe	IMG_578_60_28_61XLS.exe
PID 1208 wrote to memory of 392	1208	IMG_578_60_28_61XLS.exe	IMG_578_60_28_61XLS.exe
PID 1208 wrote to memory of 392	1208	IMG_578_60_28_61XLS.exe	IMG_578_60_28_61XLS.exe
PID 1208 wrote to memory of 392	1208	IMG_578_60_28_61XLS.exe	IMG_578_60_28_61XLS.exe
PID 1208 wrote to memory of 392	1208	IMG_578_60_28_61XLS.exe	IMG_578_60_28_61XLS.exe
PID 1208 wrote to memory of 392	1208	IMG_578_60_28_61XLS.exe	IMG_578_60_28_61XLS.exe
PID 1208 wrote to memory of 392	1208	IMG_578_60_28_61XLS.exe	IMG_578_60_28_61XLS.exe
PID 1208 wrote to memory of 392	1208	IMG_578_60_28_61XLS.exe	IMG_578_60_28_61XLS.exe
PID 1208 wrote to memory of 392	1208	IMG_578_60_28_61XLS.exe	IMG_578_60_28_61XLS.exe
PID 1208 wrote to memory of 392	1208	IMG_578_60_28_61XLS.exe	IMG_578_60_28_61XLS.exe
PID 1208 wrote to memory of 392	1208	IMG_578_60_28_61XLS.exe	IMG_578_60_28_61XLS.exe
PID 1208 wrote to memory of 392	1208	IMG_578_60_28_61XLS.exe	IMG_578_60_28_61XLS.exe
PID 1208 wrote to memory of 392	1208	IMG_578_60_28_61XLS.exe	IMG_578_60_28_61XLS.exe
PID 392 wrote to memory of 892	392	IMG_578_60_28_61XLS.exe	cmd.exe
PID 392 wrote to memory of 892	392	IMG_578_60_28_61XLS.exe	cmd.exe
PID 392 wrote to memory of 892	392	IMG_578_60_28_61XLS.exe	cmd.exe
PID 392 wrote to memory of 892	392	IMG_578_60_28_61XLS.exe	cmd.exe
PID 892 wrote to memory of 2028	892	cmd.exe	taskkill.exe
PID 892 wrote to memory of 2028	892	cmd.exe	taskkill.exe
PID 892 wrote to memory of 2028	892	cmd.exe	taskkill.exe
PID 892 wrote to memory of 2028	892	cmd.exe	taskkill.exe

C:\Users\Admin\AppData\Local\Temp\IMG_578_60_28_61XLS.exe
"C:\Users\Admin\AppData\Local\Temp\IMG_578_60_28_61XLS.exe"
1⤵
- Modifies WinLogon for persistence
- Suspicious use of SetThreadContext
- Suspicious behavior: EnumeratesProcesses
- Suspicious use of AdjustPrivilegeToken
- Suspicious use of WriteProcessMemory
PID:1208

C:\Windows\SysWOW64\WindowsPowerShell\v1.0\powershell.exe
"powershell" Add-MpPreference -ExclusionPath C:\
2⤵
- Suspicious behavior: EnumeratesProcesses
- Suspicious use of AdjustPrivilegeToken
PID:1708

C:\Users\Admin\AppData\Local\Temp\IMG_578_60_28_61XLS.exe
C:\Users\Admin\AppData\Local\Temp\IMG_578_60_28_61XLS.exe
2⤵
- Loads dropped DLL
- Checks processor information in registry
- Suspicious use of WriteProcessMemory
PID:392

C:\Windows\SysWOW64\cmd.exe
"C:\Windows\System32\cmd.exe" /c taskkill /pid 392 & erase C:\Users\Admin\AppData\Local\Temp\IMG_578_60_28_61XLS.exe & RD /S /Q C:\\ProgramData\\667966341000313\\* & exit
3⤵
- Deletes itself
- Suspicious use of WriteProcessMemory
PID:892

C:\Windows\SysWOW64\taskkill.exe
taskkill /pid 392
4⤵
- Kills process with taskkill
- Suspicious use of AdjustPrivilegeToken
PID:2028

Network

MITRE ATT&CK Matrix ATT&CK v6

Initial Access

Execution

Persistence

Winlogon Helper DLL

1

T1004

Privilege Escalation

Defense Evasion

Modify Registry

1

T1112

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

Loading Replay Monitor...

Downloads

\ProgramData\mozglue.dll
MD5
8f73c08a9660691143661bf7332c3c27

SHA1
37fa65dd737c50fda710fdbde89e51374d0c204a

SHA256
3fe6b1c54b8cf28f571e0c5d6636b4069a8ab00b4f11dd842cfec00691d0c9cd

SHA512
0042ecf9b3571bb5eba2de893e8b2371df18f7c5a589f52ee66e4bfbaa15a5b8b7cc6a155792aaa8988528c27196896d5e82e1751c998bacea0d92395f66ad89

Download Submit
\ProgramData\msvcp140.dll
MD5
109f0f02fd37c84bfc7508d4227d7ed5

SHA1
ef7420141bb15ac334d3964082361a460bfdb975

SHA256
334e69ac9367f708ce601a6f490ff227d6c20636da5222f148b25831d22e13d4

SHA512
46eb62b65817365c249b48863d894b4669e20fcb3992e747cd5c9fdd57968e1b2cf7418d1c9340a89865eadda362b8db51947eb4427412eb83b35994f932fd39

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
\ProgramData\vcruntime140.dll
MD5
7587bf9cb4147022cd5681b015183046

SHA1
f2106306a8f6f0da5afb7fc765cfa0757ad5a628

SHA256
c40bb03199a2054dabfc7a8e01d6098e91de7193619effbd0f142a7bf031c14d

SHA512
0b63e4979846ceba1b1ed8470432ea6aa18cca66b5f5322d17b14bc0dfa4b2ee09ca300a016e16a01db5123e4e022820698f46d9bad1078bd24675b4b181e91f

Download Submit
memory/392-67-0x0000000000400000-0x0000000000438000-memory.dmp

Filesize
224KB

Download
memory/392-68-0x000000000040717B-mapping.dmp

Download
memory/392-72-0x0000000000400000-0x0000000000438000-memory.dmp

Filesize
224KB

Download
memory/892-115-0x0000000000000000-mapping.dmp

Download
memory/1208-59-0x0000000000EE0000-0x0000000000EE1000-memory.dmp

Filesize
4KB

Download
memory/1208-64-0x0000000004BF5000-0x0000000004C06000-memory.dmp

Filesize
68KB

Download
memory/1208-63-0x0000000002470000-0x00000000024B1000-memory.dmp

Filesize
260KB

Download
memory/1208-62-0x0000000000E30000-0x0000000000EBA000-memory.dmp

Filesize
552KB

Download
memory/1208-61-0x0000000004BF0000-0x0000000004BF1000-memory.dmp

Filesize
4KB

Download
memory/1708-75-0x0000000000E90000-0x0000000000E91000-memory.dmp

Filesize
4KB

Download
memory/1708-109-0x0000000006310000-0x0000000006311000-memory.dmp

Filesize
4KB

Download
memory/1708-79-0x00000000056D0000-0x00000000056D1000-memory.dmp

Filesize
4KB

Download
memory/1708-84-0x0000000005720000-0x0000000005721000-memory.dmp

Filesize
4KB

Download
memory/1708-85-0x0000000006120000-0x0000000006121000-memory.dmp

Filesize
4KB

Download
memory/1708-92-0x0000000006290000-0x0000000006291000-memory.dmp

Filesize
4KB

Download
memory/1708-93-0x000000007EF30000-0x000000007EF31000-memory.dmp

Filesize
4KB

Download
memory/1708-94-0x00000000055F0000-0x00000000055F1000-memory.dmp

Filesize
4KB

Download
memory/1708-108-0x0000000006300000-0x0000000006301000-memory.dmp

Filesize
4KB

Download
memory/1708-76-0x0000000002750000-0x0000000002751000-memory.dmp

Filesize
4KB

Download
memory/1708-74-0x0000000002620000-0x000000000326A000-memory.dmp

Filesize
12.3MB

Download
memory/1708-73-0x0000000002620000-0x000000000326A000-memory.dmp

Filesize
12.3MB

Download
memory/1708-71-0x0000000004820000-0x0000000004821000-memory.dmp

Filesize
4KB

Download
memory/1708-70-0x00000000009A0000-0x00000000009A1000-memory.dmp

Filesize
4KB

Download
memory/1708-66-0x0000000075561000-0x0000000075563000-memory.dmp

Filesize
8KB

Download
memory/1708-65-0x0000000000000000-mapping.dmp

Download
memory/2028-116-0x0000000000000000-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