oski | c0765fd53d64c425a848b89fa1168552fd2cae90984cfa14c0b7d4e0789fece7

Analysis

max time kernel
122s
max time network
122s
platform
windows7_x64
resource
win7-20231215-en
resource tags

arch:x64arch:x86image:win7-20231215-enlocale:en-usos:windows7-x64system
submitted
04-02-2024 06:34

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General

Target

8e771b25550073599c67601bad91b7b4.exe
Size

1017KB
MD5

8e771b25550073599c67601bad91b7b4
SHA1

0190b8be28d87e6b59a7b1b1d0d0cb78a199b9d6
SHA256

c0765fd53d64c425a848b89fa1168552fd2cae90984cfa14c0b7d4e0789fece7
SHA512

33d0c0f09154168ccce1c2090c12a894a853af3195c01dd3ab9cafb575b2792bdcc4a836108c2341f6b09ab349dd5630efffd94ef4b68a08520e2d46f60e423b
SSDEEP

24576:Q+FuI0ZV/d3I42PFQ/ry2hsof85X1/+GtdHN7HH2V:rJCDhBf85l/RjHH

Score

10^/10

oski infostealer spyware stealer

Malware Config

Extracted

Family

oski

fine.le-pearl.com

Signatures

Oski
Oski is an infostealer targeting browser data, crypto wallets.
infostealer oski

CustAttr .NET packer 1 IoCs

Detects CustAttr .NET packer in memory.

resource	yara_rule
behavioral1/memory/2516-3-0x0000000000310000-0x0000000000322000-memory.dmp	CustAttr

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
T1552.001

Suspicious use of SetThreadContext 1 IoCs

description	pid	Process	procid_target
PID 2516 set thread context of 2396	2516	8e771b25550073599c67601bad91b7b4.exe	37

Enumerates physical storage devices 1 TTPs
Attempts to interact with connected storage/optical drive(s).

System Information Discovery
T1082

Program crash 1 IoCs

pid	pid_target	Process	procid_target
1744	2396	WerFault.exe	37

Creates scheduled task(s) 1 TTPs 1 IoCs

Schtasks is often used by malware for persistence or to perform post-infection execution.

persistence

Scheduled Task/Job

T1053

pid	Process
1880	schtasks.exe

Suspicious behavior: EnumeratesProcesses 4 IoCs

pid	Process
2516	8e771b25550073599c67601bad91b7b4.exe
3068	powershell.exe
2608	powershell.exe
3056	powershell.exe

Suspicious use of AdjustPrivilegeToken 4 IoCs

description	pid	Process
Token: SeDebugPrivilege	2516	8e771b25550073599c67601bad91b7b4.exe
Token: SeDebugPrivilege	3068	powershell.exe
Token: SeDebugPrivilege	2608	powershell.exe
Token: SeDebugPrivilege	3056	powershell.exe

Suspicious use of WriteProcessMemory 30 IoCs

description	pid	Process	procid_target
PID 2516 wrote to memory of 2608	2516	8e771b25550073599c67601bad91b7b4.exe	30
PID 2516 wrote to memory of 2608	2516	8e771b25550073599c67601bad91b7b4.exe	30
PID 2516 wrote to memory of 2608	2516	8e771b25550073599c67601bad91b7b4.exe	30
PID 2516 wrote to memory of 2608	2516	8e771b25550073599c67601bad91b7b4.exe	30
PID 2516 wrote to memory of 3068	2516	8e771b25550073599c67601bad91b7b4.exe	32
PID 2516 wrote to memory of 3068	2516	8e771b25550073599c67601bad91b7b4.exe	32
PID 2516 wrote to memory of 3068	2516	8e771b25550073599c67601bad91b7b4.exe	32
PID 2516 wrote to memory of 3068	2516	8e771b25550073599c67601bad91b7b4.exe	32
PID 2516 wrote to memory of 1880	2516	8e771b25550073599c67601bad91b7b4.exe	34
PID 2516 wrote to memory of 1880	2516	8e771b25550073599c67601bad91b7b4.exe	34
PID 2516 wrote to memory of 1880	2516	8e771b25550073599c67601bad91b7b4.exe	34
PID 2516 wrote to memory of 1880	2516	8e771b25550073599c67601bad91b7b4.exe	34
PID 2516 wrote to memory of 3056	2516	8e771b25550073599c67601bad91b7b4.exe	36
PID 2516 wrote to memory of 3056	2516	8e771b25550073599c67601bad91b7b4.exe	36
PID 2516 wrote to memory of 3056	2516	8e771b25550073599c67601bad91b7b4.exe	36
PID 2516 wrote to memory of 3056	2516	8e771b25550073599c67601bad91b7b4.exe	36
PID 2516 wrote to memory of 2396	2516	8e771b25550073599c67601bad91b7b4.exe	37
PID 2516 wrote to memory of 2396	2516	8e771b25550073599c67601bad91b7b4.exe	37
PID 2516 wrote to memory of 2396	2516	8e771b25550073599c67601bad91b7b4.exe	37
PID 2516 wrote to memory of 2396	2516	8e771b25550073599c67601bad91b7b4.exe	37
PID 2516 wrote to memory of 2396	2516	8e771b25550073599c67601bad91b7b4.exe	37
PID 2516 wrote to memory of 2396	2516	8e771b25550073599c67601bad91b7b4.exe	37
PID 2516 wrote to memory of 2396	2516	8e771b25550073599c67601bad91b7b4.exe	37
PID 2516 wrote to memory of 2396	2516	8e771b25550073599c67601bad91b7b4.exe	37
PID 2516 wrote to memory of 2396	2516	8e771b25550073599c67601bad91b7b4.exe	37
PID 2516 wrote to memory of 2396	2516	8e771b25550073599c67601bad91b7b4.exe	37
PID 2396 wrote to memory of 1744	2396	8e771b25550073599c67601bad91b7b4.exe	40
PID 2396 wrote to memory of 1744	2396	8e771b25550073599c67601bad91b7b4.exe	40
PID 2396 wrote to memory of 1744	2396	8e771b25550073599c67601bad91b7b4.exe	40
PID 2396 wrote to memory of 1744	2396	8e771b25550073599c67601bad91b7b4.exe	40

C:\Users\Admin\AppData\Local\Temp\8e771b25550073599c67601bad91b7b4.exe
"C:\Users\Admin\AppData\Local\Temp\8e771b25550073599c67601bad91b7b4.exe"
1⤵
- Suspicious use of SetThreadContext
- Suspicious behavior: EnumeratesProcesses
- Suspicious use of AdjustPrivilegeToken
- Suspicious use of WriteProcessMemory
PID:2516
- 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\8e771b25550073599c67601bad91b7b4.exe"
  2⤵
  - Suspicious behavior: EnumeratesProcesses
  - Suspicious use of AdjustPrivilegeToken
  PID:2608
- C:\Windows\SysWOW64\WindowsPowerShell\v1.0\powershell.exe
  "C:\Windows\System32\WindowsPowerShell\v1.0\powershell.exe" Add-MpPreference -ExclusionPath "C:\Users\Admin\AppData\Roaming\CsFvluJ.exe"
  2⤵
  - Suspicious behavior: EnumeratesProcesses
  - Suspicious use of AdjustPrivilegeToken
  PID:3068
- C:\Windows\SysWOW64\schtasks.exe
  "C:\Windows\System32\schtasks.exe" /Create /TN "Updates\CsFvluJ" /XML "C:\Users\Admin\AppData\Local\Temp\tmpD356.tmp"
  2⤵
  - Creates scheduled task(s)
  PID:1880
- C:\Windows\SysWOW64\WindowsPowerShell\v1.0\powershell.exe
  "C:\Windows\System32\WindowsPowerShell\v1.0\powershell.exe" Add-MpPreference -ExclusionPath "C:\Users\Admin\AppData\Roaming\CsFvluJ.exe"
  2⤵
  - Suspicious behavior: EnumeratesProcesses
  - Suspicious use of AdjustPrivilegeToken
  PID:3056
- C:\Users\Admin\AppData\Local\Temp\8e771b25550073599c67601bad91b7b4.exe
  "C:\Users\Admin\AppData\Local\Temp\8e771b25550073599c67601bad91b7b4.exe"
  2⤵
  - Suspicious use of WriteProcessMemory
  PID:2396
- - C:\Windows\SysWOW64\WerFault.exe
    C:\Windows\SysWOW64\WerFault.exe -u -p 2396 -s 784
    3⤵
    - Program crash
    PID:1744

Network

MITRE ATT&CK Enterprise v15

Reconnaissance

Resource Development

Initial Access

Execution

Scheduled Task/Job

T1053

Persistence

Scheduled Task/Job

T1053

Privilege Escalation

Scheduled Task/Job

T1053

Defense Evasion

Credential Access

Unsecured Credentials

T1552

Credentials In Files

T1552.001

Discovery

System Information Discovery

T1082

Lateral Movement

Collection

Data from Local System

T1005

Command and Control

Exfiltration

Impact

Replay Monitor

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Downloads

C:\Users\Admin\AppData\Local\Microsoft\Windows\Temporary Internet Files\Content.IE5\LFTKP12M\suspendedpage[1].htm

Filesize
496B

MD5
1842eed13fddc700a50adada08a0f84d

SHA1
5e7b6997ffaf89afdb803de2e9231cd8886621ae

SHA256
47ac9eef48022403111f9cef6871af594079acdd88da83e7d2b2a92fa47f7368

SHA512
0d0086367e60782f81324abc5a79ae4c19aaa96aeb7aead23d4ca2dde0af5cc7cf3cc9b6e391b95405ed97a136fcd99af3f868a6027b89b5fcc47cff52272b1d

Download Submit
C:\Users\Admin\AppData\Local\Temp\tmpD356.tmp

Filesize
1KB

MD5
230f1197385527bc022482a86ab5ae70

SHA1
728a8183fada7ac23a46f78eaac7f8a72c2ba23e

SHA256
d5a695ab808ad032ac5664252eead4cf3c49922c6cf8ec739c0a97834cbad77c

SHA512
71e14d8ac5777078952413e61776544195ecd1f69aa088e669758b2681225b0b52dceaf2bb2f8a232a5cb972cf8f8e6eaf4367450dd065468825a0bafde73e16

Download Submit
C:\Users\Admin\AppData\Roaming\Microsoft\Windows\Recent\CustomDestinations\2SVK0H6WGGOLC72AS40Z.temp

Filesize
7KB

MD5
2a5eac5eaa0b710598342d4a3414c603

SHA1
26ca87facb91376ccccf25824938a11e7e93b03d

SHA256
4aa53a1eeb78044ecb8c9616e7418be8baf896dbc91f9b958c420ca1397c418d

SHA512
d99329cabd43b7ea18308e42dcc9423deec87ec2cd0a7949c9a72c52fba5500d0ce4e483c348bc53587bae70519f04444f9a293dea1d9bcc823a7d80fa6b96bd

Download Submit
memory/2396-27-0x0000000000400000-0x0000000000438000-memory.dmp

Filesize
224KB

Download
memory/2396-23-0x0000000000400000-0x0000000000438000-memory.dmp

Filesize
224KB

Download
memory/2396-29-0x0000000000400000-0x0000000000438000-memory.dmp

Filesize
224KB

Download
memory/2396-40-0x0000000000400000-0x0000000000438000-memory.dmp

Filesize
224KB

Download
memory/2396-66-0x0000000000400000-0x0000000000438000-memory.dmp

Filesize
224KB

Download
memory/2396-25-0x000000007EFDE000-0x000000007EFDF000-memory.dmp

Filesize
4KB

Download
memory/2396-24-0x0000000000400000-0x0000000000438000-memory.dmp

Filesize
224KB

Download
memory/2396-20-0x0000000000400000-0x0000000000438000-memory.dmp

Filesize
224KB

Download
memory/2396-21-0x0000000000400000-0x0000000000438000-memory.dmp

Filesize
224KB

Download
memory/2396-22-0x0000000000400000-0x0000000000438000-memory.dmp

Filesize
224KB

Download
memory/2516-1-0x0000000074A40000-0x000000007512E000-memory.dmp

Filesize
6.9MB

Download
memory/2516-3-0x0000000000310000-0x0000000000322000-memory.dmp

Filesize
72KB

Download
memory/2516-0-0x0000000000F80000-0x0000000001082000-memory.dmp

Filesize
1.0MB

Download
memory/2516-7-0x0000000004870000-0x00000000048A8000-memory.dmp

Filesize
224KB

Download
memory/2516-4-0x0000000074A40000-0x000000007512E000-memory.dmp

Filesize
6.9MB

Download
memory/2516-2-0x0000000004830000-0x0000000004870000-memory.dmp

Filesize
256KB

Download
memory/2516-5-0x0000000004830000-0x0000000004870000-memory.dmp

Filesize
256KB

Download
memory/2516-6-0x00000000057E0000-0x000000000587E000-memory.dmp

Filesize
632KB

Download
memory/2516-65-0x0000000074A40000-0x000000007512E000-memory.dmp

Filesize
6.9MB

Download
memory/2608-48-0x000000006ED20000-0x000000006F2CB000-memory.dmp

Filesize
5.7MB

Download
memory/2608-37-0x0000000002890000-0x00000000028D0000-memory.dmp

Filesize
256KB

Download
memory/2608-39-0x000000006ED20000-0x000000006F2CB000-memory.dmp

Filesize
5.7MB

Download
memory/2608-36-0x000000006ED20000-0x000000006F2CB000-memory.dmp

Filesize
5.7MB

Download
memory/3056-41-0x000000006ED20000-0x000000006F2CB000-memory.dmp

Filesize
5.7MB

Download
memory/3056-44-0x0000000002750000-0x0000000002790000-memory.dmp

Filesize
256KB

Download
memory/3056-46-0x000000006ED20000-0x000000006F2CB000-memory.dmp

Filesize
5.7MB

Download
memory/3056-43-0x0000000002750000-0x0000000002790000-memory.dmp

Filesize
256KB

Download
memory/3056-42-0x000000006ED20000-0x000000006F2CB000-memory.dmp

Filesize
5.7MB

Download
memory/3068-45-0x00000000029C0000-0x0000000002A00000-memory.dmp

Filesize
256KB

Download
memory/3068-47-0x000000006ED20000-0x000000006F2CB000-memory.dmp

Filesize
5.7MB

Download
memory/3068-35-0x000000006ED20000-0x000000006F2CB000-memory.dmp

Filesize
5.7MB

Download
memory/3068-38-0x000000006ED20000-0x000000006F2CB000-memory.dmp

Filesize
5.7MB

Download