oski | c0765fd53d64c425a848b89fa1168552fd2cae90984cfa14c0b7d4e0789fece7

Analysis

max time kernel
87s
max time network
150s
platform
windows10-2004_x64
resource
win10v2004-20231222-en
resource tags

arch:x64arch:x86image:win10v2004-20231222-enlocale:en-usos:windows10-2004-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
behavioral2/memory/3020-7-0x0000000005580000-0x0000000005592000-memory.dmp	CustAttr

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

description	ioc	Process
Key value queried	\REGISTRY\USER\S-1-5-21-3803511929-1339359695-2191195476-1000\Control Panel\International\Geo\Nation	8e771b25550073599c67601bad91b7b4.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
T1552.001

Suspicious use of SetThreadContext 1 IoCs

description	pid	Process	procid_target
PID 3020 set thread context of 4668	3020	8e771b25550073599c67601bad91b7b4.exe	105

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
3956	4668	WerFault.exe	105

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
2904	schtasks.exe

Suspicious behavior: EnumeratesProcesses 9 IoCs

pid	Process
4828	powershell.exe
5048	powershell.exe
3020	8e771b25550073599c67601bad91b7b4.exe
3020	8e771b25550073599c67601bad91b7b4.exe
3020	8e771b25550073599c67601bad91b7b4.exe
4828	powershell.exe
4452	powershell.exe
5048	powershell.exe
4452	powershell.exe

Suspicious use of AdjustPrivilegeToken 4 IoCs

description	pid	Process
Token: SeDebugPrivilege	4828	powershell.exe
Token: SeDebugPrivilege	5048	powershell.exe
Token: SeDebugPrivilege	3020	8e771b25550073599c67601bad91b7b4.exe
Token: SeDebugPrivilege	4452	powershell.exe

Suspicious use of WriteProcessMemory 24 IoCs

description	pid	Process	procid_target
PID 3020 wrote to memory of 4828	3020	8e771b25550073599c67601bad91b7b4.exe	97
PID 3020 wrote to memory of 4828	3020	8e771b25550073599c67601bad91b7b4.exe	97
PID 3020 wrote to memory of 4828	3020	8e771b25550073599c67601bad91b7b4.exe	97
PID 3020 wrote to memory of 5048	3020	8e771b25550073599c67601bad91b7b4.exe	99
PID 3020 wrote to memory of 5048	3020	8e771b25550073599c67601bad91b7b4.exe	99
PID 3020 wrote to memory of 5048	3020	8e771b25550073599c67601bad91b7b4.exe	99
PID 3020 wrote to memory of 2904	3020	8e771b25550073599c67601bad91b7b4.exe	101
PID 3020 wrote to memory of 2904	3020	8e771b25550073599c67601bad91b7b4.exe	101
PID 3020 wrote to memory of 2904	3020	8e771b25550073599c67601bad91b7b4.exe	101
PID 3020 wrote to memory of 4452	3020	8e771b25550073599c67601bad91b7b4.exe	104
PID 3020 wrote to memory of 4452	3020	8e771b25550073599c67601bad91b7b4.exe	104
PID 3020 wrote to memory of 4452	3020	8e771b25550073599c67601bad91b7b4.exe	104
PID 3020 wrote to memory of 4508	3020	8e771b25550073599c67601bad91b7b4.exe	103
PID 3020 wrote to memory of 4508	3020	8e771b25550073599c67601bad91b7b4.exe	103
PID 3020 wrote to memory of 4508	3020	8e771b25550073599c67601bad91b7b4.exe	103
PID 3020 wrote to memory of 4668	3020	8e771b25550073599c67601bad91b7b4.exe	105
PID 3020 wrote to memory of 4668	3020	8e771b25550073599c67601bad91b7b4.exe	105
PID 3020 wrote to memory of 4668	3020	8e771b25550073599c67601bad91b7b4.exe	105
PID 3020 wrote to memory of 4668	3020	8e771b25550073599c67601bad91b7b4.exe	105
PID 3020 wrote to memory of 4668	3020	8e771b25550073599c67601bad91b7b4.exe	105
PID 3020 wrote to memory of 4668	3020	8e771b25550073599c67601bad91b7b4.exe	105
PID 3020 wrote to memory of 4668	3020	8e771b25550073599c67601bad91b7b4.exe	105
PID 3020 wrote to memory of 4668	3020	8e771b25550073599c67601bad91b7b4.exe	105
PID 3020 wrote to memory of 4668	3020	8e771b25550073599c67601bad91b7b4.exe	105

C:\Users\Admin\AppData\Local\Temp\8e771b25550073599c67601bad91b7b4.exe
"C:\Users\Admin\AppData\Local\Temp\8e771b25550073599c67601bad91b7b4.exe"
1⤵
- Checks computer location settings
- Suspicious use of SetThreadContext
- Suspicious behavior: EnumeratesProcesses
- Suspicious use of AdjustPrivilegeToken
- Suspicious use of WriteProcessMemory
PID:3020
- 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:4828
- 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:5048
- C:\Windows\SysWOW64\schtasks.exe
  "C:\Windows\System32\schtasks.exe" /Create /TN "Updates\CsFvluJ" /XML "C:\Users\Admin\AppData\Local\Temp\tmpF54D.tmp"
  2⤵
  - Creates scheduled task(s)
  PID:2904
- C:\Users\Admin\AppData\Local\Temp\8e771b25550073599c67601bad91b7b4.exe
  "C:\Users\Admin\AppData\Local\Temp\8e771b25550073599c67601bad91b7b4.exe"
  2⤵
  PID:4508
- 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:4452
- C:\Users\Admin\AppData\Local\Temp\8e771b25550073599c67601bad91b7b4.exe
  "C:\Users\Admin\AppData\Local\Temp\8e771b25550073599c67601bad91b7b4.exe"
  2⤵
  PID:4668
- - C:\Windows\SysWOW64\WerFault.exe
    C:\Windows\SysWOW64\WerFault.exe -u -p 4668 -s 1324
    3⤵
    - Program crash
    PID:3956

C:\Windows\SysWOW64\WerFault.exe
C:\Windows\SysWOW64\WerFault.exe -pss -s 408 -p 4668 -ip 4668
1⤵
PID:2216

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

Query Registry

T1012

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\CLR_v4.0_32\UsageLogs\powershell.exe.log

Filesize
2KB

MD5
3d086a433708053f9bf9523e1d87a4e8

SHA1
b3ab5d4f282a4c8fe8c3005b8a557ed5a0e37f28

SHA256
6f8fd1b8d9788ad54eaeee329232187e24b7b43393a01aeba2d6e9675231fb69

SHA512
931ae42b4c68a4507ff2342332b08eb407050d47cf4176137ea022d0f6e513c689e998445a04c6d18d4877391705c586bfce0234632b898d41aaed0957996dfd

Download Submit
C:\Users\Admin\AppData\Local\Microsoft\Windows\INetCache\IE\NSWVVUXL\suspendedpage[1].htm

Filesize
496B

MD5
1842eed13fddc700a50adada08a0f84d

SHA1
5e7b6997ffaf89afdb803de2e9231cd8886621ae

SHA256
47ac9eef48022403111f9cef6871af594079acdd88da83e7d2b2a92fa47f7368

SHA512
0d0086367e60782f81324abc5a79ae4c19aaa96aeb7aead23d4ca2dde0af5cc7cf3cc9b6e391b95405ed97a136fcd99af3f868a6027b89b5fcc47cff52272b1d

Download Submit
C:\Users\Admin\AppData\Local\Temp\__PSScriptPolicyTest_hbzssuqg.slu.ps1

Filesize
60B

MD5
d17fe0a3f47be24a6453e9ef58c94641

SHA1
6ab83620379fc69f80c0242105ddffd7d98d5d9d

SHA256
96ad1146eb96877eab5942ae0736b82d8b5e2039a80d3d6932665c1a4c87dcf7

SHA512
5b592e58f26c264604f98f6aa12860758ce606d1c63220736cf0c779e4e18e3cec8706930a16c38b20161754d1017d1657d35258e58ca22b18f5b232880dec82

Download Submit
C:\Users\Admin\AppData\Local\Temp\tmpF54D.tmp

Filesize
1KB

MD5
6cfe7c306a618255c5da50faadb93270

SHA1
f54dfdcdad1dbc53aa557dd263ed4e90c499c814

SHA256
7a0b02cfda8a5b89ae25762f8c5b741d9f05907210fe26d9b9db19cd9471971c

SHA512
8180cbb7bdae3fcd63fb047bc9888ab02ccee80284d9edfc14e0686d0c299a52421d9e349964ec35a76d9a320db44985835d015e9c2e58406ade9d124135a53f

Download Submit
memory/3020-7-0x0000000005580000-0x0000000005592000-memory.dmp

Filesize
72KB

Download
memory/3020-1-0x00000000743C0000-0x0000000074B70000-memory.dmp

Filesize
7.7MB

Download
memory/3020-6-0x00000000051E0000-0x00000000051EA000-memory.dmp

Filesize
40KB

Download
memory/3020-52-0x00000000743C0000-0x0000000074B70000-memory.dmp

Filesize
7.7MB

Download
memory/3020-8-0x00000000743C0000-0x0000000074B70000-memory.dmp

Filesize
7.7MB

Download
memory/3020-9-0x0000000005110000-0x0000000005120000-memory.dmp

Filesize
64KB

Download
memory/3020-10-0x0000000006AC0000-0x0000000006B5E000-memory.dmp

Filesize
632KB

Download
memory/3020-11-0x00000000066E0000-0x0000000006718000-memory.dmp

Filesize
224KB

Download
memory/3020-4-0x0000000005260000-0x00000000052FC000-memory.dmp

Filesize
624KB

Download
memory/3020-5-0x0000000005110000-0x0000000005120000-memory.dmp

Filesize
64KB

Download
memory/3020-2-0x00000000055F0000-0x0000000005B94000-memory.dmp

Filesize
5.6MB

Download
memory/3020-3-0x0000000005120000-0x00000000051B2000-memory.dmp

Filesize
584KB

Download
memory/3020-0-0x0000000000610000-0x0000000000712000-memory.dmp

Filesize
1.0MB

Download
memory/4452-124-0x0000000005080000-0x0000000005090000-memory.dmp

Filesize
64KB

Download
memory/4452-112-0x0000000070BB0000-0x0000000070BFC000-memory.dmp

Filesize
304KB

Download
memory/4452-123-0x0000000005080000-0x0000000005090000-memory.dmp

Filesize
64KB

Download
memory/4452-53-0x00000000743C0000-0x0000000074B70000-memory.dmp

Filesize
7.7MB

Download
memory/4452-55-0x0000000005080000-0x0000000005090000-memory.dmp

Filesize
64KB

Download
memory/4452-139-0x00000000743C0000-0x0000000074B70000-memory.dmp

Filesize
7.7MB

Download
memory/4452-54-0x0000000005080000-0x0000000005090000-memory.dmp

Filesize
64KB

Download
memory/4668-134-0x0000000000400000-0x0000000000438000-memory.dmp

Filesize
224KB

Download
memory/4668-51-0x0000000000400000-0x0000000000438000-memory.dmp

Filesize
224KB

Download
memory/4668-47-0x0000000000400000-0x0000000000438000-memory.dmp

Filesize
224KB

Download
memory/4668-49-0x0000000000400000-0x0000000000438000-memory.dmp

Filesize
224KB

Download
memory/4668-48-0x0000000000400000-0x0000000000438000-memory.dmp

Filesize
224KB

Download
memory/4828-20-0x0000000005790000-0x0000000005DB8000-memory.dmp

Filesize
6.2MB

Download
memory/4828-76-0x000000007F8F0000-0x000000007F900000-memory.dmp

Filesize
64KB

Download
memory/4828-43-0x0000000006190000-0x00000000064E4000-memory.dmp

Filesize
3.3MB

Download
memory/4828-56-0x0000000006610000-0x000000000662E000-memory.dmp

Filesize
120KB

Download
memory/4828-27-0x0000000006020000-0x0000000006086000-memory.dmp

Filesize
408KB

Download
memory/4828-22-0x0000000005EA0000-0x0000000005EC2000-memory.dmp

Filesize
136KB

Download
memory/4828-66-0x0000000006820000-0x000000000686C000-memory.dmp

Filesize
304KB

Download
memory/4828-16-0x0000000005080000-0x00000000050B6000-memory.dmp

Filesize
216KB

Download
memory/4828-75-0x0000000006BE0000-0x0000000006C12000-memory.dmp

Filesize
200KB

Download
memory/4828-110-0x0000000007940000-0x000000000795A000-memory.dmp

Filesize
104KB

Download
memory/4828-79-0x0000000070BB0000-0x0000000070BFC000-memory.dmp

Filesize
304KB

Download
memory/4828-138-0x00000000743C0000-0x0000000074B70000-memory.dmp

Filesize
7.7MB

Download
memory/4828-17-0x00000000743C0000-0x0000000074B70000-memory.dmp

Filesize
7.7MB

Download
memory/4828-18-0x0000000005150000-0x0000000005160000-memory.dmp

Filesize
64KB

Download
memory/4828-19-0x0000000005150000-0x0000000005160000-memory.dmp

Filesize
64KB

Download
memory/4828-102-0x00000000743C0000-0x0000000074B70000-memory.dmp

Filesize
7.7MB

Download
memory/4828-113-0x0000000005150000-0x0000000005160000-memory.dmp

Filesize
64KB

Download
memory/4828-25-0x0000000005F40000-0x0000000005FA6000-memory.dmp

Filesize
408KB

Download
memory/4828-107-0x0000000007F80000-0x00000000085FA000-memory.dmp

Filesize
6.5MB

Download
memory/5048-91-0x0000000007210000-0x000000000722E000-memory.dmp

Filesize
120KB

Download
memory/5048-23-0x0000000004B20000-0x0000000004B30000-memory.dmp

Filesize
64KB

Download
memory/5048-111-0x00000000073F0000-0x00000000073FA000-memory.dmp

Filesize
40KB

Download
memory/5048-100-0x0000000004B20000-0x0000000004B30000-memory.dmp

Filesize
64KB

Download
memory/5048-21-0x00000000743C0000-0x0000000074B70000-memory.dmp

Filesize
7.7MB

Download
memory/5048-103-0x0000000007240000-0x00000000072E3000-memory.dmp

Filesize
652KB

Download
memory/5048-125-0x0000000007600000-0x0000000007696000-memory.dmp

Filesize
600KB

Download
memory/5048-126-0x0000000007580000-0x0000000007591000-memory.dmp

Filesize
68KB

Download
memory/5048-130-0x00000000075B0000-0x00000000075BE000-memory.dmp

Filesize
56KB

Download
memory/5048-131-0x00000000075C0000-0x00000000075D4000-memory.dmp

Filesize
80KB

Download
memory/5048-132-0x00000000076C0000-0x00000000076DA000-memory.dmp

Filesize
104KB

Download
memory/5048-133-0x00000000076A0000-0x00000000076A8000-memory.dmp

Filesize
32KB

Download
memory/5048-104-0x0000000004B20000-0x0000000004B30000-memory.dmp

Filesize
64KB

Download
memory/5048-77-0x000000007FA90000-0x000000007FAA0000-memory.dmp

Filesize
64KB

Download
memory/5048-140-0x00000000743C0000-0x0000000074B70000-memory.dmp

Filesize
7.7MB

Download
memory/5048-78-0x0000000070BB0000-0x0000000070BFC000-memory.dmp

Filesize
304KB

Download
memory/5048-24-0x0000000004B20000-0x0000000004B30000-memory.dmp

Filesize
64KB

Download