oski | 9ca37d16fbb8d3dfd3801c6032ebedde91fff2a3dbebe0c61b2ad392597afac3

Analysis

max time kernel
146s
max time network
151s
platform
windows10-2004_x64
resource
win10v2004-20231222-en
resource tags

arch:x64arch:x86image:win10v2004-20231222-enlocale:en-usos:windows10-2004-x64system
submitted
31-12-2023 05:37

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General

Target

PURCHASE ORDER AZAS112.xls.xll
Size

880KB
MD5

4ebc548df517cae4c7e3122e9c75ede6
SHA1

6e19e1e6f3a7b96cf562c2f6768f92580652d427
SHA256

6c67e1ccf77b872b1f3cf257a257d75c4995dc079945080f578b51357ccdbe55
SHA512

359be199470a83ad32db555840c5b33a6b69db96cc188d83d550639fe9fe75464529819fdf0cded9d489cb7ba03802667ac373d3ad2a3f7e4069b023c8508290
SSDEEP

24576:/zbGHAzHAjX1BcLgtBoKF0KihRPX0qFNE:/ziHILEV6Fm

Score

10^/10

oski infostealer spyware stealer

Malware Config

Extracted

Language

xlm4.0

Source

Extracted

Family

oski

himarkh.xyz

Signatures

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

Executes dropped EXE 2 IoCs

pid	Process
912	service.exe
5076	service.exe

Loads dropped DLL 2 IoCs

pid	Process
976	EXCEL.EXE
976	EXCEL.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 912 set thread context of 5076	912	service.exe	95

Program crash 1 IoCs

pid	pid_target	Process	procid_target
4632	5076	WerFault.exe	95

Checks processor information in registry 2 TTPs 3 IoCs

Processor information is often read in order to detect sandboxing environments.

Query Registry

T1012

System Information Discovery

T1082

description	ioc	Process
Key opened	\REGISTRY\MACHINE\Hardware\Description\System\CentralProcessor\0	EXCEL.EXE
Key value queried	\REGISTRY\MACHINE\HARDWARE\DESCRIPTION\System\CentralProcessor\0\~MHz	EXCEL.EXE
Key value queried	\REGISTRY\MACHINE\HARDWARE\DESCRIPTION\System\CentralProcessor\0\ProcessorNameString	EXCEL.EXE

Enumerates system info in registry 2 TTPs 3 IoCs

Query Registry

T1012

System Information Discovery

T1082

description	ioc	Process
Key opened	\REGISTRY\MACHINE\Hardware\Description\System\BIOS	EXCEL.EXE
Key value queried	\REGISTRY\MACHINE\HARDWARE\DESCRIPTION\System\BIOS\SystemFamily	EXCEL.EXE
Key value queried	\REGISTRY\MACHINE\HARDWARE\DESCRIPTION\System\BIOS\SystemSKU	EXCEL.EXE

Suspicious behavior: AddClipboardFormatListener 1 IoCs

pid	Process
976	EXCEL.EXE

Suspicious behavior: MapViewOfSection 1 IoCs

pid	Process
912	service.exe

Suspicious use of SetWindowsHookEx 11 IoCs

pid	Process
976	EXCEL.EXE
976	EXCEL.EXE
976	EXCEL.EXE
976	EXCEL.EXE
976	EXCEL.EXE
976	EXCEL.EXE
976	EXCEL.EXE
976	EXCEL.EXE
976	EXCEL.EXE
976	EXCEL.EXE
976	EXCEL.EXE

Suspicious use of WriteProcessMemory 7 IoCs

description	pid	Process	procid_target
PID 976 wrote to memory of 912	976	EXCEL.EXE	93
PID 976 wrote to memory of 912	976	EXCEL.EXE	93
PID 976 wrote to memory of 912	976	EXCEL.EXE	93
PID 912 wrote to memory of 5076	912	service.exe	95
PID 912 wrote to memory of 5076	912	service.exe	95
PID 912 wrote to memory of 5076	912	service.exe	95
PID 912 wrote to memory of 5076	912	service.exe	95

C:\Program Files\Microsoft Office\Root\Office16\EXCEL.EXE
"C:\Program Files\Microsoft Office\Root\Office16\EXCEL.EXE" "C:\Users\Admin\AppData\Local\Temp\PURCHASE ORDER AZAS112.xls.xll"
1⤵
- Loads dropped DLL
- Checks processor information in registry
- Enumerates system info in registry
- Suspicious behavior: AddClipboardFormatListener
- Suspicious use of SetWindowsHookEx
- Suspicious use of WriteProcessMemory
PID:976
- C:\Users\Admin\AppData\Roaming\service.exe
  "C:\Users\Admin\AppData\Roaming\service.exe"
  2⤵
  - Executes dropped EXE
  - Suspicious use of SetThreadContext
  - Suspicious behavior: MapViewOfSection
  - Suspicious use of WriteProcessMemory
  PID:912
- - C:\Users\Admin\AppData\Roaming\service.exe
    "C:\Users\Admin\AppData\Roaming\service.exe"
    3⤵
    - Executes dropped EXE
    PID:5076
  - - C:\Windows\SysWOW64\WerFault.exe
      C:\Windows\SysWOW64\WerFault.exe -u -p 5076 -s 944
      4⤵
      Program crash
      PID:4632

C:\Windows\SysWOW64\WerFault.exe
C:\Windows\SysWOW64\WerFault.exe -pss -s 408 -p 5076 -ip 5076
1⤵
PID:336

Network

MITRE ATT&CK Enterprise v15

Reconnaissance

Resource Development

Initial Access

Execution

Persistence

Privilege Escalation

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

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Downloads

C:\Users\Admin\AppData\Local\Temp\PURCHASE ORDER AZAS112.xls.xll

Filesize
92KB

MD5
9417223b17c61e2ebc5c35b7b11282f4

SHA1
f2e6ddc924896c10ad587a205051c8b9c921e84f

SHA256
056043d93299c907a76868660220920f1056e768d6da369a5eea1ea84f077141

SHA512
694da8e18d0a1009cd358dab8f50b107f2727e8ed558ad7fb73ed7d172769f5a8891fe0354927256db1814c71542f89509b795ccea789865160fc3a8cca686b8

Download Submit
C:\Users\Admin\AppData\Roaming\service.exe

Filesize
680KB

MD5
c20495a19b01f9258ca23d01933ec47e

SHA1
1642d96fb066baaa592e6b147e7a40cb49aeb2ba

SHA256
61c1436f9b48159b56f1f71561626724682d54e1714ec722c76c3b7667f0cbb7

SHA512
b84494e422b2231141836a8ef0bbe04e6fd17c189dcbabacd8b3cbfe9dc5b224dfbefa457fb105f147350b45044e7a0363a101fe008e3610aa066bd379d4ed68

Download Submit
memory/912-66-0x00000000012B0000-0x00000000012B2000-memory.dmp

Filesize
8KB

Download
memory/912-65-0x0000000001000000-0x0000000001100000-memory.dmp

Filesize
1024KB

Download
memory/976-33-0x000001439F660000-0x000001439F670000-memory.dmp

Filesize
64KB

Download
memory/976-4-0x00007FF931B70000-0x00007FF931D65000-memory.dmp

Filesize
2.0MB

Download
memory/976-3-0x00007FF8F1BF0000-0x00007FF8F1C00000-memory.dmp

Filesize
64KB

Download
memory/976-29-0x00000143B9D60000-0x00000143B9D70000-memory.dmp

Filesize
64KB

Download
memory/976-31-0x00000143B9D60000-0x00000143B9D70000-memory.dmp

Filesize
64KB

Download
memory/976-5-0x00007FF8F1BF0000-0x00007FF8F1C00000-memory.dmp

Filesize
64KB

Download
memory/976-9-0x00007FF931B70000-0x00007FF931D65000-memory.dmp

Filesize
2.0MB

Download
memory/976-11-0x00007FF8EF450000-0x00007FF8EF460000-memory.dmp

Filesize
64KB

Download
memory/976-15-0x00007FF931B70000-0x00007FF931D65000-memory.dmp

Filesize
2.0MB

Download
memory/976-16-0x00007FF931B70000-0x00007FF931D65000-memory.dmp

Filesize
2.0MB

Download
memory/976-17-0x00007FF931B70000-0x00007FF931D65000-memory.dmp

Filesize
2.0MB

Download
memory/976-19-0x00007FF931B70000-0x00007FF931D65000-memory.dmp

Filesize
2.0MB

Download
memory/976-18-0x00007FF8EF450000-0x00007FF8EF460000-memory.dmp

Filesize
64KB

Download
memory/976-14-0x00007FF931B70000-0x00007FF931D65000-memory.dmp

Filesize
2.0MB

Download
memory/976-13-0x00007FF931B70000-0x00007FF931D65000-memory.dmp

Filesize
2.0MB

Download
memory/976-12-0x00007FF931B70000-0x00007FF931D65000-memory.dmp

Filesize
2.0MB

Download
memory/976-10-0x00007FF931B70000-0x00007FF931D65000-memory.dmp

Filesize
2.0MB

Download
memory/976-8-0x00007FF931B70000-0x00007FF931D65000-memory.dmp

Filesize
2.0MB

Download
memory/976-7-0x00007FF8F1BF0000-0x00007FF8F1C00000-memory.dmp

Filesize
64KB

Download
memory/976-6-0x00007FF931B70000-0x00007FF931D65000-memory.dmp

Filesize
2.0MB

Download
memory/976-24-0x00000143A0510000-0x00000143A052C000-memory.dmp

Filesize
112KB

Download
memory/976-25-0x00000143A1B10000-0x00000143A1B4C000-memory.dmp

Filesize
240KB

Download
memory/976-30-0x00000143B9D60000-0x00000143B9D70000-memory.dmp

Filesize
64KB

Download
memory/976-32-0x00000143B9C40000-0x00000143B9CF6000-memory.dmp

Filesize
728KB

Download
memory/976-117-0x00007FF931B70000-0x00007FF931D65000-memory.dmp

Filesize
2.0MB

Download
memory/976-2-0x00007FF931B70000-0x00007FF931D65000-memory.dmp

Filesize
2.0MB

Download
memory/976-1-0x00007FF8F1BF0000-0x00007FF8F1C00000-memory.dmp

Filesize
64KB

Download
memory/976-28-0x00000143B9D60000-0x00000143B9D70000-memory.dmp

Filesize
64KB

Download
memory/976-27-0x00000143B9D60000-0x00000143B9D70000-memory.dmp

Filesize
64KB

Download
memory/976-26-0x00007FF9093C0000-0x00007FF909E81000-memory.dmp

Filesize
10.8MB

Download
memory/976-21-0x00000143A0390000-0x00000143A0486000-memory.dmp

Filesize
984KB

Download
memory/976-84-0x00007FF931B70000-0x00007FF931D65000-memory.dmp

Filesize
2.0MB

Download
memory/976-118-0x00007FF9093C0000-0x00007FF909E81000-memory.dmp

Filesize
10.8MB

Download
memory/976-0-0x00007FF8F1BF0000-0x00007FF8F1C00000-memory.dmp

Filesize
64KB

Download
memory/976-116-0x00007FF8F1BF0000-0x00007FF8F1C00000-memory.dmp

Filesize
64KB

Download
memory/976-115-0x00007FF8F1BF0000-0x00007FF8F1C00000-memory.dmp

Filesize
64KB

Download
memory/976-85-0x00007FF931B70000-0x00007FF931D65000-memory.dmp

Filesize
2.0MB

Download
memory/976-86-0x00007FF931B70000-0x00007FF931D65000-memory.dmp

Filesize
2.0MB

Download
memory/976-87-0x00007FF9093C0000-0x00007FF909E81000-memory.dmp

Filesize
10.8MB

Download
memory/976-88-0x00000143B9D60000-0x00000143B9D70000-memory.dmp

Filesize
64KB

Download
memory/976-89-0x00000143B9D60000-0x00000143B9D70000-memory.dmp

Filesize
64KB

Download
memory/976-90-0x00000143B9D60000-0x00000143B9D70000-memory.dmp

Filesize
64KB

Download
memory/976-91-0x00000143B9D60000-0x00000143B9D70000-memory.dmp

Filesize
64KB

Download
memory/976-92-0x00000143B9D60000-0x00000143B9D70000-memory.dmp

Filesize
64KB

Download
memory/976-96-0x00000143B9D60000-0x00000143B9D70000-memory.dmp

Filesize
64KB

Download
memory/976-113-0x00007FF8F1BF0000-0x00007FF8F1C00000-memory.dmp

Filesize
64KB

Download
memory/976-114-0x00007FF8F1BF0000-0x00007FF8F1C00000-memory.dmp

Filesize
64KB

Download
memory/5076-67-0x0000000000400000-0x0000000000438000-memory.dmp

Filesize
224KB

Download
memory/5076-69-0x0000000000400000-0x0000000000438000-memory.dmp

Filesize
224KB

Download
memory/5076-70-0x0000000000400000-0x0000000000438000-memory.dmp

Filesize
224KB

Download
memory/5076-71-0x0000000000400000-0x0000000000438000-memory.dmp

Filesize
224KB

Download
memory/5076-81-0x0000000000400000-0x0000000000438000-memory.dmp

Filesize
224KB

Download

Analysis

Sharing

General

Malware Config

Extracted

Extracted

Signatures

Processes

Network

MITRE ATT&CK Enterprise v15

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Downloads