oski | 7b05d46b12945a754e07915535b5c977078818b088ce5de1a31ff40b3c2bef61

Analysis

max time kernel
133s
max time network
124s
platform
windows10-2004_x64
resource
win10v2004-20240802-en
resource tags

arch:x64arch:x86image:win10v2004-20240802-enlocale:en-usos:windows10-2004-x64system
submitted
07-10-2024 01:23

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General

Target

1ab68861cbb539af250899445e168233_JaffaCakes118.xll
Size

1.2MB
MD5

1ab68861cbb539af250899445e168233
SHA1

e4299a99e197c034b76f9415acb599c810f4f659
SHA256

7b05d46b12945a754e07915535b5c977078818b088ce5de1a31ff40b3c2bef61
SHA512

3ce1f719220f13fafb5fc07d0c8def676fd717ecf3e068088b0e0bf35b686866b0e9adc4cd051fd2990f46df5b120e365e77b93b8f6ff5863297a3fcd6a6a518
SSDEEP

24576:DzbGHAzHKjX1rBY4ZyrE7K3yl8PeVooA/AB2LEgpUqY/CL+elRtA3k0yy3l4VzCa:DziHILpUhxel6k0yyW094

Score

10^/10

oski discovery infostealer spyware stealer

Malware Config

Extracted

Family

oski

himarkh.xyz

Signatures

Oski
Oski is an infostealer targeting browser data, crypto wallets.
infostealer oski
Executes dropped EXE 2 IoCs

Processes:

service.exeservice.exe

pid process

3956 service.exe
1000 service.exe
Loads dropped DLL 2 IoCs

Processes:

EXCEL.EXE

pid process

4484 EXCEL.EXE
4484 EXCEL.EXE
Reads user/profile data of web browsers 3 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

Credentials from Web Browsers
T1555.003
Suspicious use of SetThreadContext 1 IoCs

Processes:

service.exe

description pid process target process

PID 3956 set thread context of 1000 3956 service.exe service.exe
Program crash 1 IoCs

Processes:

WerFault.exe

pid pid_target process target process

3152 1000 WerFault.exe service.exe
System Location Discovery: System Language Discovery 1 TTPs 1 IoCs
Attempt gather information about the system language of a victim in order to infer the geographical location of that host.
discovery

System Language Discovery
T1614.001

Processes:

service.exe

description ioc process

Key opened \REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language service.exe

pid	process
3956	service.exe
1000	service.exe

description	pid	process	target process
PID 3956 set thread context of 1000	3956	service.exe	service.exe

pid	pid_target	process	target process
3152	1000	WerFault.exe	service.exe

description	ioc	process
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	service.exe

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

Processes:

EXCEL.EXE

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

Processes:

EXCEL.EXE

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

Processes:

EXCEL.EXE

pid process

4484 EXCEL.EXE
Suspicious use of FindShellTrayWindow 2 IoCs

Processes:

EXCEL.EXE

pid process

4484 EXCEL.EXE
4484 EXCEL.EXE

Suspicious use of SetWindowsHookEx 11 IoCs

Processes:

EXCEL.EXE

pid	process
4484	EXCEL.EXE
4484	EXCEL.EXE
4484	EXCEL.EXE
4484	EXCEL.EXE
4484	EXCEL.EXE
4484	EXCEL.EXE
4484	EXCEL.EXE
4484	EXCEL.EXE
4484	EXCEL.EXE
4484	EXCEL.EXE
4484	EXCEL.EXE

Suspicious use of WriteProcessMemory 12 IoCs

Processes:

EXCEL.EXEservice.exe

description	pid	process	target process
PID 4484 wrote to memory of 3956	4484	EXCEL.EXE	service.exe
PID 4484 wrote to memory of 3956	4484	EXCEL.EXE	service.exe
PID 4484 wrote to memory of 3956	4484	EXCEL.EXE	service.exe
PID 3956 wrote to memory of 1000	3956	service.exe	service.exe
PID 3956 wrote to memory of 1000	3956	service.exe	service.exe
PID 3956 wrote to memory of 1000	3956	service.exe	service.exe
PID 3956 wrote to memory of 1000	3956	service.exe	service.exe
PID 3956 wrote to memory of 1000	3956	service.exe	service.exe
PID 3956 wrote to memory of 1000	3956	service.exe	service.exe
PID 3956 wrote to memory of 1000	3956	service.exe	service.exe
PID 3956 wrote to memory of 1000	3956	service.exe	service.exe
PID 3956 wrote to memory of 1000	3956	service.exe	service.exe

C:\Program Files\Microsoft Office\Root\Office16\EXCEL.EXE
"C:\Program Files\Microsoft Office\Root\Office16\EXCEL.EXE" "C:\Users\Admin\AppData\Local\Temp\1ab68861cbb539af250899445e168233_JaffaCakes118.xll"
1⤵
- Loads dropped DLL
- Checks processor information in registry
- Enumerates system info in registry
- Suspicious behavior: AddClipboardFormatListener
- Suspicious use of FindShellTrayWindow
- Suspicious use of SetWindowsHookEx
- Suspicious use of WriteProcessMemory
PID:4484
- C:\Users\Admin\AppData\Roaming\service.exe
  "C:\Users\Admin\AppData\Roaming\service.exe"
  2⤵
  - Executes dropped EXE
  - Suspicious use of SetThreadContext
  - System Location Discovery: System Language Discovery
  - Suspicious use of WriteProcessMemory
  PID:3956
- - C:\Users\Admin\AppData\Roaming\service.exe
    "C:\Users\Admin\AppData\Roaming\service.exe"
    3⤵
    - Executes dropped EXE
    PID:1000
  - - C:\Windows\SysWOW64\WerFault.exe
      C:\Windows\SysWOW64\WerFault.exe -u -p 1000 -s 1296
      4⤵
      Program crash
      PID:3152

C:\Windows\SysWOW64\WerFault.exe
C:\Windows\SysWOW64\WerFault.exe -pss -s 420 -p 1000 -ip 1000
1⤵
PID:4316

Network

MITRE ATT&CK Enterprise v15

Reconnaissance

Resource Development

Initial Access

Execution

Persistence

Privilege Escalation

Defense Evasion

Credential Access

Credentials from Password Stores

T1555

Credentials from Web Browsers

T1555.003

Unsecured Credentials

T1552

Credentials In Files

T1552.001

Discovery

Query Registry

T1012

System Information Discovery

T1082

System Location Discovery

T1614

System Language Discovery

T1614.001

Lateral Movement

Collection

Data from Local System

T1005

Command and Control

Exfiltration

Impact

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Downloads

C:\Users\Admin\AppData\Local\Temp\1ab68861cbb539af250899445e168233_JaffaCakes118.xll

Filesize
1.2MB

MD5
1ab68861cbb539af250899445e168233

SHA1
e4299a99e197c034b76f9415acb599c810f4f659

SHA256
7b05d46b12945a754e07915535b5c977078818b088ce5de1a31ff40b3c2bef61

SHA512
3ce1f719220f13fafb5fc07d0c8def676fd717ecf3e068088b0e0bf35b686866b0e9adc4cd051fd2990f46df5b120e365e77b93b8f6ff5863297a3fcd6a6a518

Download Submit
C:\Users\Admin\AppData\Local\Temp\sample.xlsx

Filesize
12KB

MD5
36cadc2fa9f7938f74061fda9b126a9f

SHA1
5252934ac46fb3bc8fdb361880ade043070501bd

SHA256
afc8ea53b3eeb62a44ce6d2b4593931d009ec00769410e76478cc88eab59d1f4

SHA512
b7668575cea53280a3d553b18e1ac7670eeafab9f2d48db5d86496722e2b1d5d48a3ac3b1e56a8d7198abd771f2d95fef4449792c214dffc2097e62273e7db1f

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

Filesize
694KB

MD5
fbfaade9d2adf0bd1e757f3023f75c39

SHA1
660c09dc2d7a7ea2ee9654af493fc1c1c691782a

SHA256
22215d10db3c10c324394a1fbe382c7d0660d2394b37672bc679ab6c6194d6bc

SHA512
764b4fe68560f033aaf8275d0a06cf9c4069541c832d1f2ed76ea2b5cdf4a915e05e4e669d4424bc129e148be651b3f959d8af399026dd12cce304815708932e

Download Submit
memory/1000-97-0x0000000000400000-0x0000000000438000-memory.dmp

Filesize
224KB

Download
memory/1000-94-0x0000000000400000-0x0000000000438000-memory.dmp

Filesize
224KB

Download
memory/3956-81-0x0000000006CE0000-0x0000000006CF6000-memory.dmp

Filesize
88KB

Download
memory/3956-89-0x00007FF84BB70000-0x00007FF84BD65000-memory.dmp

Filesize
2.0MB

Download
memory/3956-80-0x00000000054F0000-0x00000000054FA000-memory.dmp

Filesize
40KB

Download
memory/3956-79-0x0000000005220000-0x00000000052BC000-memory.dmp

Filesize
624KB

Download
memory/3956-78-0x0000000005180000-0x0000000005212000-memory.dmp

Filesize
584KB

Download
memory/3956-77-0x0000000005730000-0x0000000005CD4000-memory.dmp

Filesize
5.6MB

Download
memory/3956-76-0x00000000007F0000-0x00000000008A4000-memory.dmp

Filesize
720KB

Download
memory/3956-75-0x00007FF84BB70000-0x00007FF84BD65000-memory.dmp

Filesize
2.0MB

Download
memory/3956-92-0x0000000007180000-0x0000000007222000-memory.dmp

Filesize
648KB

Download
memory/3956-93-0x0000000009840000-0x0000000009878000-memory.dmp

Filesize
224KB

Download
memory/4484-11-0x00007FF84BB70000-0x00007FF84BD65000-memory.dmp

Filesize
2.0MB

Download
memory/4484-7-0x00007FF84BB70000-0x00007FF84BD65000-memory.dmp

Filesize
2.0MB

Download
memory/4484-18-0x00007FF84BB70000-0x00007FF84BD65000-memory.dmp

Filesize
2.0MB

Download
memory/4484-19-0x00007FF8093C0000-0x00007FF8093D0000-memory.dmp

Filesize
64KB

Download
memory/4484-17-0x00007FF84BB70000-0x00007FF84BD65000-memory.dmp

Filesize
2.0MB

Download
memory/4484-15-0x00007FF84BB70000-0x00007FF84BD65000-memory.dmp

Filesize
2.0MB

Download
memory/4484-23-0x000001E1CD110000-0x000001E1CD250000-memory.dmp

Filesize
1.2MB

Download
memory/4484-27-0x00007FF84BB70000-0x00007FF84BD65000-memory.dmp

Filesize
2.0MB

Download
memory/4484-28-0x000001E1CE6A0000-0x000001E1CE6BC000-memory.dmp

Filesize
112KB

Download
memory/4484-31-0x00007FF84BB70000-0x00007FF84BD65000-memory.dmp

Filesize
2.0MB

Download
memory/4484-33-0x00007FF84BB70000-0x00007FF84BD65000-memory.dmp

Filesize
2.0MB

Download
memory/4484-32-0x00007FF84BB70000-0x00007FF84BD65000-memory.dmp

Filesize
2.0MB

Download
memory/4484-30-0x000001E1CE930000-0x000001E1CE96A000-memory.dmp

Filesize
232KB

Download
memory/4484-29-0x00007FF84BB70000-0x00007FF84BD65000-memory.dmp

Filesize
2.0MB

Download
memory/4484-34-0x00007FF84BB70000-0x00007FF84BD65000-memory.dmp

Filesize
2.0MB

Download
memory/4484-35-0x00007FF84BB70000-0x00007FF84BD65000-memory.dmp

Filesize
2.0MB

Download
memory/4484-36-0x000001E1E6A30000-0x000001E1E6AE8000-memory.dmp

Filesize
736KB

Download
memory/4484-16-0x00007FF84BB70000-0x00007FF84BD65000-memory.dmp

Filesize
2.0MB

Download
memory/4484-8-0x00007FF84BB70000-0x00007FF84BD65000-memory.dmp

Filesize
2.0MB

Download
memory/4484-1-0x00007FF80BBF0000-0x00007FF80BC00000-memory.dmp

Filesize
64KB

Download
memory/4484-12-0x00007FF84BB70000-0x00007FF84BD65000-memory.dmp

Filesize
2.0MB

Download
memory/4484-14-0x00007FF8093C0000-0x00007FF8093D0000-memory.dmp

Filesize
64KB

Download
memory/4484-13-0x00007FF84BB70000-0x00007FF84BD65000-memory.dmp

Filesize
2.0MB

Download
memory/4484-10-0x00007FF84BB70000-0x00007FF84BD65000-memory.dmp

Filesize
2.0MB

Download
memory/4484-9-0x00007FF84BB70000-0x00007FF84BD65000-memory.dmp

Filesize
2.0MB

Download
memory/4484-6-0x00007FF80BBF0000-0x00007FF80BC00000-memory.dmp

Filesize
64KB

Download
memory/4484-82-0x00007FF84BB70000-0x00007FF84BD65000-memory.dmp

Filesize
2.0MB

Download
memory/4484-83-0x00007FF84BB70000-0x00007FF84BD65000-memory.dmp

Filesize
2.0MB

Download
memory/4484-87-0x00007FF84BB70000-0x00007FF84BD65000-memory.dmp

Filesize
2.0MB

Download
memory/4484-88-0x00007FF84BB70000-0x00007FF84BD65000-memory.dmp

Filesize
2.0MB

Download
memory/4484-4-0x00007FF84BB70000-0x00007FF84BD65000-memory.dmp

Filesize
2.0MB

Download
memory/4484-5-0x00007FF80BBF0000-0x00007FF80BC00000-memory.dmp

Filesize
64KB

Download
memory/4484-0-0x00007FF80BBF0000-0x00007FF80BC00000-memory.dmp

Filesize
64KB

Download
memory/4484-2-0x00007FF80BBF0000-0x00007FF80BC00000-memory.dmp

Filesize
64KB

Download
memory/4484-3-0x00007FF84BC0D000-0x00007FF84BC0E000-memory.dmp

Filesize
4KB

Download