oski | 6f7e9f7592b5f984d3c6a7233f5f3b483593aa1dc1e9aea19d1477f2214fe48c

Analysis

max time kernel
150s
max time network
171s
platform
windows10-2004_x64
resource
win10v2004-20231215-en
resource tags

arch:x64arch:x86image:win10v2004-20231215-enlocale:en-usos:windows10-2004-x64system
submitted
09-01-2024 14:15

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General

Target

4e849d1441cd9db1675e9259e0233552.xll
Size

1.4MB
MD5

4e849d1441cd9db1675e9259e0233552
SHA1

05d51a132a5cc55bf5dc1b0c3c71583d09b41928
SHA256

6f7e9f7592b5f984d3c6a7233f5f3b483593aa1dc1e9aea19d1477f2214fe48c
SHA512

b4f820f1c74eb7bc6aee81be798d5127eae1e862329c52af6f089f3ce4a463c524b611963e943a598cd14f269afca508fb46331efef9ec054f75a41e7cf8afdc
SSDEEP

24576:WzbGHAzHAjX1zcLgoFifXiBiRXInRzxgqaqfR3hxjkY9bFX:WziHIFEMIyKEzKqaqfR3b5H

Score

10^/10

oski infostealer spyware stealer

Malware Config

Extracted

Language

xlm4.0

Source

Extracted

Family

oski

irkark.xyz

Signatures

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

Executes dropped EXE 5 IoCs

pid	Process
1988	service.exe
3204	service.exe
4056	service.exe
1248	service.exe
3044	service.exe

Loads dropped DLL 2 IoCs

pid	Process
4448	EXCEL.EXE
4448	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 1988 set thread context of 3044	1988	service.exe	108

Program crash 1 IoCs

pid	pid_target	Process	procid_target
2152	3044	WerFault.exe	108

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 value queried	\REGISTRY\MACHINE\HARDWARE\DESCRIPTION\System\CentralProcessor\0\ProcessorNameString	EXCEL.EXE
Key opened	\REGISTRY\MACHINE\Hardware\Description\System\CentralProcessor\0	EXCEL.EXE
Key value queried	\REGISTRY\MACHINE\HARDWARE\DESCRIPTION\System\CentralProcessor\0\~MHz	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
4448	EXCEL.EXE

Suspicious behavior: EnumeratesProcesses 6 IoCs

pid	Process
1988	service.exe
1988	service.exe
1988	service.exe
1988	service.exe
1988	service.exe
1988	service.exe

Suspicious use of AdjustPrivilegeToken 1 IoCs

description	pid	Process
Token: SeDebugPrivilege	1988	service.exe

Suspicious use of FindShellTrayWindow 2 IoCs

pid	Process
4448	EXCEL.EXE
4448	EXCEL.EXE

Suspicious use of SetWindowsHookEx 11 IoCs

pid	Process
4448	EXCEL.EXE
4448	EXCEL.EXE
4448	EXCEL.EXE
4448	EXCEL.EXE
4448	EXCEL.EXE
4448	EXCEL.EXE
4448	EXCEL.EXE
4448	EXCEL.EXE
4448	EXCEL.EXE
4448	EXCEL.EXE
4448	EXCEL.EXE

Suspicious use of WriteProcessMemory 21 IoCs

description	pid	Process	procid_target
PID 4448 wrote to memory of 1988	4448	EXCEL.EXE	93
PID 4448 wrote to memory of 1988	4448	EXCEL.EXE	93
PID 4448 wrote to memory of 1988	4448	EXCEL.EXE	93
PID 1988 wrote to memory of 3204	1988	service.exe	105
PID 1988 wrote to memory of 3204	1988	service.exe	105
PID 1988 wrote to memory of 3204	1988	service.exe	105
PID 1988 wrote to memory of 4056	1988	service.exe	106
PID 1988 wrote to memory of 4056	1988	service.exe	106
PID 1988 wrote to memory of 4056	1988	service.exe	106
PID 1988 wrote to memory of 1248	1988	service.exe	107
PID 1988 wrote to memory of 1248	1988	service.exe	107
PID 1988 wrote to memory of 1248	1988	service.exe	107
PID 1988 wrote to memory of 3044	1988	service.exe	108
PID 1988 wrote to memory of 3044	1988	service.exe	108
PID 1988 wrote to memory of 3044	1988	service.exe	108
PID 1988 wrote to memory of 3044	1988	service.exe	108
PID 1988 wrote to memory of 3044	1988	service.exe	108
PID 1988 wrote to memory of 3044	1988	service.exe	108
PID 1988 wrote to memory of 3044	1988	service.exe	108
PID 1988 wrote to memory of 3044	1988	service.exe	108
PID 1988 wrote to memory of 3044	1988	service.exe	108

C:\Program Files\Microsoft Office\Root\Office16\EXCEL.EXE
"C:\Program Files\Microsoft Office\Root\Office16\EXCEL.EXE" "C:\Users\Admin\AppData\Local\Temp\4e849d1441cd9db1675e9259e0233552.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:4448
- C:\Users\Admin\AppData\Roaming\service.exe
  "C:\Users\Admin\AppData\Roaming\service.exe"
  2⤵
  - Executes dropped EXE
  - Suspicious use of SetThreadContext
  - Suspicious behavior: EnumeratesProcesses
  - Suspicious use of AdjustPrivilegeToken
  - Suspicious use of WriteProcessMemory
  PID:1988
- - C:\Users\Admin\AppData\Roaming\service.exe
    "C:\Users\Admin\AppData\Roaming\service.exe"
    3⤵
    - Executes dropped EXE
    PID:3204
- - C:\Users\Admin\AppData\Roaming\service.exe
    "C:\Users\Admin\AppData\Roaming\service.exe"
    3⤵
    - Executes dropped EXE
    PID:4056
- - C:\Users\Admin\AppData\Roaming\service.exe
    "C:\Users\Admin\AppData\Roaming\service.exe"
    3⤵
    - Executes dropped EXE
    PID:1248
- - C:\Users\Admin\AppData\Roaming\service.exe
    "C:\Users\Admin\AppData\Roaming\service.exe"
    3⤵
    - Executes dropped EXE
    PID:3044
  - - C:\Windows\SysWOW64\WerFault.exe
      C:\Windows\SysWOW64\WerFault.exe -u -p 3044 -s 1292
      4⤵
      Program crash
      PID:2152

C:\Windows\SysWOW64\WerFault.exe
C:\Windows\SysWOW64\WerFault.exe -pss -s 436 -p 3044 -ip 3044
1⤵
PID:4384

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

Replay Monitor

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Downloads

C:\Users\Admin\AppData\Local\Temp\4e849d1441cd9db1675e9259e0233552.xll

Filesize
1.4MB

MD5
4e849d1441cd9db1675e9259e0233552

SHA1
05d51a132a5cc55bf5dc1b0c3c71583d09b41928

SHA256
6f7e9f7592b5f984d3c6a7233f5f3b483593aa1dc1e9aea19d1477f2214fe48c

SHA512
b4f820f1c74eb7bc6aee81be798d5127eae1e862329c52af6f089f3ce4a463c524b611963e943a598cd14f269afca508fb46331efef9ec054f75a41e7cf8afdc

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
623KB

MD5
cf4f321402dc62a3314e2d5c345f9c15

SHA1
24846f88e80ce62b305ed27db760020bb51b4276

SHA256
44a537a3460a292723834b0b4d086f862de101216f133034f452167cf0ffa413

SHA512
3fac8d39611526a1dfb25228730fa36ad793790928d76446f2758909a48ffa9a130f84cdc564266ee3dad712676fe6b65af968c79d7fc75f194f5f8fc674fe67

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

Filesize
453KB

MD5
9015f1e0832d6fb1355f5780cd3ab101

SHA1
7722d53600a3c291e844bcd851a2ade7eca98a22

SHA256
60cee250c1d0c6fa3bafb10f1f0e2f3cc8a521e52a699696d0e876fb283bcce4

SHA512
4343738ae7c5c3e2f3eea271b0c695911e37a494021d140fdd350eb2f03229625eb3496afc344913dc80c3cf15a643c89f3b8ca630372fa5d1662dcd3b5e92fa

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

Filesize
650KB

MD5
6ce4a5fa446916b4f3347fe109084902

SHA1
8410237a3e9ce9ca517802318e4f752e7b3706ff

SHA256
746cb1868df3552574b154617863391c2a1ebf26925c7c0b8dc117cded6182e0

SHA512
78cd6f60b2e801340b4096c40ab50885e3cc7f47f9523c87f664366fee7c55b4157335b97712aea326301a9cee6c220dd734598f3b96dcd495f300938d64db1b

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

Filesize
960KB

MD5
341d5821cd6f361422eacc710759e3b7

SHA1
2987678ceb1e1494c81f3594c09c5b2e74a7f27d

SHA256
1709c88e2169e1d2dc7148ec02516ad0de44d7e7a74e846dccfd444152606d3a

SHA512
a6f06cd2624e76d49787f8fab7b3a3fa8a61aa920c99346b0348a2fd83a84f07ec7c421e1a1da40b39c69024b61cf86034a113837c72e9624342677692361c91

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

Filesize
192KB

MD5
b27339f72ada889993033ed21a396f2e

SHA1
3eb93d64de91c9fa30c4836c8c16bf37ddcb0037

SHA256
10d84e8a38e5947fed24c1d188237d5cdea568e0ee0f4942d92f706a4242ad5d

SHA512
efe73311c6328f09c185e4bb73110e3c215f32f410e38780640b2feca2e01f010e520c7097859b84e476ac03a08c8fd6e9ff03caf245cb6bab18eb376b75a126

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

Filesize
133KB

MD5
39b80a52c0d2b0033ead69737167b226

SHA1
330817f27ec03e1ba7a5a20199bc0b5437c2690f

SHA256
6df2194819910da49f97706ae7937679e4105aa81a8c054f041dac5026c81699

SHA512
74eb0f0651567f7f8d08736ce4ace281176ef45e3089941648cee6685aba4cdedc858bd8d26c2e717b654024cd5d16b43425f6315250e01c5c8e779adcbf352a

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

Filesize
64KB

MD5
6ea2a95032467504c33d38a71d3783f9

SHA1
d985434ff5ec6517d817c4dd781d6e23041c0972

SHA256
da717d1fe1aefc156a85134f1a064a0d140004cf4fcfbbd0e9a09ad30186d782

SHA512
721a4bd16b55d2df2ab159e1feb6d1a84e79c0091755f3b02e30cc3c6aa7306c54150b8f29d5f4434fd810e0625e70eea2455d192ad92adcb3cc4e5c31a2267c

Download Submit
memory/1988-87-0x0000000006DF0000-0x0000000006E92000-memory.dmp

Filesize
648KB

Download
memory/1988-70-0x0000000005430000-0x0000000005440000-memory.dmp

Filesize
64KB

Download
memory/1988-66-0x0000000000820000-0x0000000000924000-memory.dmp

Filesize
1.0MB

Download
memory/1988-67-0x00000000057B0000-0x0000000005D54000-memory.dmp

Filesize
5.6MB

Download
memory/1988-68-0x0000000005300000-0x0000000005392000-memory.dmp

Filesize
584KB

Download
memory/1988-69-0x0000000005440000-0x00000000054DC000-memory.dmp

Filesize
624KB

Download
memory/1988-99-0x0000000075360000-0x0000000075B10000-memory.dmp

Filesize
7.7MB

Download
memory/1988-65-0x0000000075360000-0x0000000075B10000-memory.dmp

Filesize
7.7MB

Download
memory/1988-88-0x0000000009460000-0x0000000009498000-memory.dmp

Filesize
224KB

Download
memory/1988-86-0x0000000005430000-0x0000000005440000-memory.dmp

Filesize
64KB

Download
memory/1988-85-0x0000000075360000-0x0000000075B10000-memory.dmp

Filesize
7.7MB

Download
memory/1988-72-0x0000000006160000-0x000000000617A000-memory.dmp

Filesize
104KB

Download
memory/1988-71-0x00000000053C0000-0x00000000053CA000-memory.dmp

Filesize
40KB

Download
memory/3044-95-0x0000000000400000-0x0000000000438000-memory.dmp

Filesize
224KB

Download
memory/3044-98-0x0000000000400000-0x0000000000438000-memory.dmp

Filesize
224KB

Download
memory/3044-100-0x0000000000400000-0x0000000000438000-memory.dmp

Filesize
224KB

Download
memory/3044-101-0x0000000000400000-0x0000000000438000-memory.dmp

Filesize
224KB

Download
memory/3044-106-0x0000000000400000-0x0000000000438000-memory.dmp

Filesize
224KB

Download
memory/4448-74-0x00007FFC98520000-0x00007FFC98FE1000-memory.dmp

Filesize
10.8MB

Download
memory/4448-0-0x00007FFC81A50000-0x00007FFC81A60000-memory.dmp

Filesize
64KB

Download
memory/4448-6-0x00007FFCC19D0000-0x00007FFCC1BC5000-memory.dmp

Filesize
2.0MB

Download
memory/4448-7-0x00007FFCC19D0000-0x00007FFCC1BC5000-memory.dmp

Filesize
2.0MB

Download
memory/4448-8-0x00007FFCC19D0000-0x00007FFCC1BC5000-memory.dmp

Filesize
2.0MB

Download
memory/4448-30-0x000002FEB0700000-0x000002FEB0710000-memory.dmp

Filesize
64KB

Download
memory/4448-29-0x000002FEB07E0000-0x000002FEB08E8000-memory.dmp

Filesize
1.0MB

Download
memory/4448-28-0x000002FEB2030000-0x000002FEB2040000-memory.dmp

Filesize
64KB

Download
memory/4448-73-0x00007FFCC19D0000-0x00007FFCC1BC5000-memory.dmp

Filesize
2.0MB

Download
memory/4448-10-0x00007FFC7F6D0000-0x00007FFC7F6E0000-memory.dmp

Filesize
64KB

Download
memory/4448-80-0x000002FEB2030000-0x000002FEB2040000-memory.dmp

Filesize
64KB

Download
memory/4448-81-0x000002FEB2030000-0x000002FEB2040000-memory.dmp

Filesize
64KB

Download
memory/4448-82-0x000002FEB2030000-0x000002FEB2040000-memory.dmp

Filesize
64KB

Download
memory/4448-83-0x000002FEB2030000-0x000002FEB2040000-memory.dmp

Filesize
64KB

Download
memory/4448-84-0x000002FEB2030000-0x000002FEB2040000-memory.dmp

Filesize
64KB

Download
memory/4448-27-0x000002FEB2030000-0x000002FEB2040000-memory.dmp

Filesize
64KB

Download
memory/4448-26-0x000002FEB2030000-0x000002FEB2040000-memory.dmp

Filesize
64KB

Download
memory/4448-4-0x00007FFCC19D0000-0x00007FFCC1BC5000-memory.dmp

Filesize
2.0MB

Download
memory/4448-24-0x000002FEB2030000-0x000002FEB2040000-memory.dmp

Filesize
64KB

Download
memory/4448-5-0x00007FFC81A50000-0x00007FFC81A60000-memory.dmp

Filesize
64KB

Download
memory/4448-3-0x00007FFC81A50000-0x00007FFC81A60000-memory.dmp

Filesize
64KB

Download
memory/4448-25-0x000002FEB2030000-0x000002FEB2040000-memory.dmp

Filesize
64KB

Download
memory/4448-2-0x00007FFC81A50000-0x00007FFC81A60000-memory.dmp

Filesize
64KB

Download
memory/4448-1-0x00007FFC81A50000-0x00007FFC81A60000-memory.dmp

Filesize
64KB

Download
memory/4448-23-0x00007FFC98520000-0x00007FFC98FE1000-memory.dmp

Filesize
10.8MB

Download
memory/4448-22-0x000002FEB0760000-0x000002FEB079C000-memory.dmp

Filesize
240KB

Download
memory/4448-21-0x000002FEB0730000-0x000002FEB074C000-memory.dmp

Filesize
112KB

Download
memory/4448-9-0x00007FFC7F6D0000-0x00007FFC7F6E0000-memory.dmp

Filesize
64KB

Download
memory/4448-13-0x000002FEAD7F0000-0x000002FEAD971000-memory.dmp

Filesize
1.5MB

Download
memory/4448-118-0x00007FFC81A50000-0x00007FFC81A60000-memory.dmp

Filesize
64KB

Download
memory/4448-119-0x00007FFC81A50000-0x00007FFC81A60000-memory.dmp

Filesize
64KB

Download
memory/4448-120-0x00007FFC81A50000-0x00007FFC81A60000-memory.dmp

Filesize
64KB

Download
memory/4448-121-0x00007FFC81A50000-0x00007FFC81A60000-memory.dmp

Filesize
64KB

Download
memory/4448-122-0x00007FFCC19D0000-0x00007FFCC1BC5000-memory.dmp

Filesize
2.0MB

Download
memory/4448-123-0x00007FFC98520000-0x00007FFC98FE1000-memory.dmp

Filesize
10.8MB

Download