oski | 2a71fdd923c2c1cf13ffee31c74aed4a464ff0c97cf9a6c42a788d4fdcec3efd

Analysis

max time kernel
101s
max time network
133s
platform
windows10-2004_x64
resource
win10v2004-20231215-en
resource tags

arch:x64arch:x86image:win10v2004-20231215-enlocale:en-usos:windows10-2004-x64system
submitted
03-02-2024 04:10

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General

Target

8b5c6a2b226e7c6ba532e8448d6bfc82.xll
Size

1.4MB
MD5

8b5c6a2b226e7c6ba532e8448d6bfc82
SHA1

723acb3cba81639e58e0041da83f2db58077cedf
SHA256

2a71fdd923c2c1cf13ffee31c74aed4a464ff0c97cf9a6c42a788d4fdcec3efd
SHA512

3f994a7f1edbd35f5c0d66868a5ba848d501849f185012cfe86224f1be5fa03efd1dfea8494d270cd8a08f03a07f90d9ae990fabb88964a510b208227ab1b997
SSDEEP

24576:WzbGHAzHAjX18cLgGglNv9lyttyCKiCtXNs4sHqQDmMmkZ5TQ1oj5+QPybODrB++:WziHIaEG+strCPsDFp/6e98OM

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 2 IoCs

pid	Process
4244	service.exe
4424	service.exe

Loads dropped DLL 2 IoCs

pid	Process
4236	EXCEL.EXE
4236	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 4244 set thread context of 4424	4244	service.exe	97

Program crash 1 IoCs

pid	pid_target	Process	procid_target
2828	4424	WerFault.exe	97

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
4236	EXCEL.EXE

Suspicious use of FindShellTrayWindow 2 IoCs

pid	Process
4236	EXCEL.EXE
4236	EXCEL.EXE

Suspicious use of SetWindowsHookEx 11 IoCs

pid	Process
4236	EXCEL.EXE
4236	EXCEL.EXE
4236	EXCEL.EXE
4236	EXCEL.EXE
4236	EXCEL.EXE
4236	EXCEL.EXE
4236	EXCEL.EXE
4236	EXCEL.EXE
4236	EXCEL.EXE
4236	EXCEL.EXE
4236	EXCEL.EXE

Suspicious use of WriteProcessMemory 12 IoCs

description	pid	Process	procid_target
PID 4236 wrote to memory of 4244	4236	EXCEL.EXE	89
PID 4236 wrote to memory of 4244	4236	EXCEL.EXE	89
PID 4236 wrote to memory of 4244	4236	EXCEL.EXE	89
PID 4244 wrote to memory of 4424	4244	service.exe	97
PID 4244 wrote to memory of 4424	4244	service.exe	97
PID 4244 wrote to memory of 4424	4244	service.exe	97
PID 4244 wrote to memory of 4424	4244	service.exe	97
PID 4244 wrote to memory of 4424	4244	service.exe	97
PID 4244 wrote to memory of 4424	4244	service.exe	97
PID 4244 wrote to memory of 4424	4244	service.exe	97
PID 4244 wrote to memory of 4424	4244	service.exe	97
PID 4244 wrote to memory of 4424	4244	service.exe	97

C:\Program Files\Microsoft Office\Root\Office16\EXCEL.EXE
"C:\Program Files\Microsoft Office\Root\Office16\EXCEL.EXE" "C:\Users\Admin\AppData\Local\Temp\8b5c6a2b226e7c6ba532e8448d6bfc82.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:4236
- C:\Users\Admin\AppData\Roaming\service.exe
  "C:\Users\Admin\AppData\Roaming\service.exe"
  2⤵
  - Executes dropped EXE
  - Suspicious use of SetThreadContext
  - Suspicious use of WriteProcessMemory
  PID:4244
- - C:\Users\Admin\AppData\Roaming\service.exe
    "C:\Users\Admin\AppData\Roaming\service.exe"
    3⤵
    - Executes dropped EXE
    PID:4424
  - - C:\Windows\SysWOW64\WerFault.exe
      C:\Windows\SysWOW64\WerFault.exe -u -p 4424 -s 1296
      4⤵
      Program crash
      PID:2828

C:\Windows\SysWOW64\WerFault.exe
C:\Windows\SysWOW64\WerFault.exe -pss -s 408 -p 4424 -ip 4424
1⤵
PID:4900

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\8b5c6a2b226e7c6ba532e8448d6bfc82.xll

Filesize
307KB

MD5
345b8d7aa36df23d6c4dfe9d5370094a

SHA1
062fb3a7d39b075aa0c5a8cc6030b66abf1482d8

SHA256
22e5a766719465fbd40fc4f93f5d0e56a8d398977ab4b194d25f3b0f7adf2ee6

SHA512
4e6ff30f380a7b7769aa6de7a275bcc2d56002b8b229178f60604bcf9f1897e6e1679d159cb32ef58a37e03f7d8335d45a2a156654cd4f07e0d3eb56f5f325d6

Download Submit
C:\Users\Admin\AppData\Local\Temp\8b5c6a2b226e7c6ba532e8448d6bfc82.xll

Filesize
221KB

MD5
172f0c0ec30e78bdbf1d4dc91aa3ebb3

SHA1
b2c3a4e8c15105eb8bfe7872db07866a1207b5e4

SHA256
c4a6e41d81f4e49533b28abcc7e167468a5c232fc1d88de4418e3a5a165d086c

SHA512
a2eb29fe3580d7fd275a509c6926ca0ba4f1c1b504362f6d777635aca539e705319dbcba016daf2dd162b006835b9a2fae52bfed4657e15c5c55ec238e39d1b4

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
1016KB

MD5
1f3f0df96f20b886328d79074944067d

SHA1
93658ff5de14681b09439fe94e272f4f329e3a8a

SHA256
51855bf07f8dbe24ca6f11c6dc9bd4e8c27bed93159f96afdb448cce7bf7d515

SHA512
61ebb3d18e21702bad5ece5701e019322ac4a44b5c1b5be4ca54fb9d7f89a4b2c9541fe7fa49fbb0f61d74751eeaca15302190233dc8d1e5ed50c958789d1b0b

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

Filesize
109KB

MD5
e10c90d48b3d65b000327e40c3dfe163

SHA1
d787616a818cf49ff4afbe316bac8df1cab54c63

SHA256
9f2adb431adc11dfa304e65a7cdb6a036a635137fa253db862811f48599c7569

SHA512
bd2a4d597815ba1ec18b94b24473cf9d157632f68e5129d6ff7bf1a2980fdf33d36b2fc6ec1cc63b162b31344670c88fa6225e62374771155673fda385665886

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

Filesize
68KB

MD5
ed0e37844462bf5276fce30896c37b5a

SHA1
29c6a8f08a5ab5abbcc5f69fe69a02dbcc8bf38c

SHA256
3d844adb11b19c5d7324f0f50f1d8c06adbec9bd34d7bcc886dcdeb288bfe051

SHA512
bb536c8e800bd6815d492f852a21b6b555111180c0936f805dd3193df88246f867e5f9e040a8bff0284ec18638edf34efb6a485a7efe48dc3274dc23d20da188

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

Filesize
94KB

MD5
39677c1fe5c7db242e8012361dbc443e

SHA1
b94af77671343fa08e8c624713e830ed9d4e597f

SHA256
1561b667cb948226e5c2606dd0990d6fb64c8247cfe39012e4e6907db9ff870e

SHA512
472a70c30556a0338aab7e5dd86ffe0d5cb5ae35af11fc50cbbb383fc215acde6b332981bd3085def9204f5d56279bcaeec27c330f9a838c671b1f3c05aeee0e

Download Submit
memory/4236-27-0x0000018927E50000-0x0000018927E60000-memory.dmp

Filesize
64KB

Download
memory/4236-25-0x0000018927E50000-0x0000018927E60000-memory.dmp

Filesize
64KB

Download
memory/4236-13-0x00007FFF28E90000-0x00007FFF29085000-memory.dmp

Filesize
2.0MB

Download
memory/4236-14-0x00007FFF28E90000-0x00007FFF29085000-memory.dmp

Filesize
2.0MB

Download
memory/4236-16-0x00007FFEE65B0000-0x00007FFEE65C0000-memory.dmp

Filesize
64KB

Download
memory/4236-15-0x00007FFF28E90000-0x00007FFF29085000-memory.dmp

Filesize
2.0MB

Download
memory/4236-11-0x00007FFF28E90000-0x00007FFF29085000-memory.dmp

Filesize
2.0MB

Download
memory/4236-4-0x00007FFEE8F10000-0x00007FFEE8F20000-memory.dmp

Filesize
64KB

Download
memory/4236-3-0x00007FFF28E90000-0x00007FFF29085000-memory.dmp

Filesize
2.0MB

Download
memory/4236-2-0x00007FFEE8F10000-0x00007FFEE8F20000-memory.dmp

Filesize
64KB

Download
memory/4236-19-0x000001890E230000-0x000001890E3B1000-memory.dmp

Filesize
1.5MB

Download
memory/4236-10-0x00007FFF28E90000-0x00007FFF29085000-memory.dmp

Filesize
2.0MB

Download
memory/4236-8-0x00007FFEE8F10000-0x00007FFEE8F20000-memory.dmp

Filesize
64KB

Download
memory/4236-22-0x000001890E590000-0x000001890E5AC000-memory.dmp

Filesize
112KB

Download
memory/4236-23-0x000001890E6B0000-0x000001890E6EC000-memory.dmp

Filesize
240KB

Download
memory/4236-24-0x00007FFF00B90000-0x00007FFF01651000-memory.dmp

Filesize
10.8MB

Download
memory/4236-26-0x0000018927E50000-0x0000018927E60000-memory.dmp

Filesize
64KB

Download
memory/4236-92-0x0000018927E50000-0x0000018927E60000-memory.dmp

Filesize
64KB

Download
memory/4236-29-0x0000018928F40000-0x0000018929048000-memory.dmp

Filesize
1.0MB

Download
memory/4236-28-0x0000018927E50000-0x0000018927E60000-memory.dmp

Filesize
64KB

Download
memory/4236-30-0x0000018927E50000-0x0000018927E60000-memory.dmp

Filesize
64KB

Download
memory/4236-12-0x00007FFEE65B0000-0x00007FFEE65C0000-memory.dmp

Filesize
64KB

Download
memory/4236-31-0x000001890E6F0000-0x000001890E700000-memory.dmp

Filesize
64KB

Download
memory/4236-9-0x00007FFF28E90000-0x00007FFF29085000-memory.dmp

Filesize
2.0MB

Download
memory/4236-7-0x00007FFF28E90000-0x00007FFF29085000-memory.dmp

Filesize
2.0MB

Download
memory/4236-5-0x00007FFF28E90000-0x00007FFF29085000-memory.dmp

Filesize
2.0MB

Download
memory/4236-6-0x00007FFEE8F10000-0x00007FFEE8F20000-memory.dmp

Filesize
64KB

Download
memory/4236-0-0x00007FFEE8F10000-0x00007FFEE8F20000-memory.dmp

Filesize
64KB

Download
memory/4236-128-0x00007FFF00B90000-0x00007FFF01651000-memory.dmp

Filesize
10.8MB

Download
memory/4236-127-0x00007FFF28E90000-0x00007FFF29085000-memory.dmp

Filesize
2.0MB

Download
memory/4236-126-0x00007FFEE8F10000-0x00007FFEE8F20000-memory.dmp

Filesize
64KB

Download
memory/4236-125-0x00007FFEE8F10000-0x00007FFEE8F20000-memory.dmp

Filesize
64KB

Download
memory/4236-124-0x00007FFEE8F10000-0x00007FFEE8F20000-memory.dmp

Filesize
64KB

Download
memory/4236-123-0x00007FFEE8F10000-0x00007FFEE8F20000-memory.dmp

Filesize
64KB

Download
memory/4236-1-0x00007FFF28E90000-0x00007FFF29085000-memory.dmp

Filesize
2.0MB

Download
memory/4236-84-0x00007FFF28E90000-0x00007FFF29085000-memory.dmp

Filesize
2.0MB

Download
memory/4236-85-0x00007FFF28E90000-0x00007FFF29085000-memory.dmp

Filesize
2.0MB

Download
memory/4236-86-0x00007FFF00B90000-0x00007FFF01651000-memory.dmp

Filesize
10.8MB

Download
memory/4236-91-0x0000018927E50000-0x0000018927E60000-memory.dmp

Filesize
64KB

Download
memory/4236-90-0x0000018927E50000-0x0000018927E60000-memory.dmp

Filesize
64KB

Download
memory/4236-89-0x0000018927E50000-0x0000018927E60000-memory.dmp

Filesize
64KB

Download
memory/4236-88-0x0000018927E50000-0x0000018927E60000-memory.dmp

Filesize
64KB

Download
memory/4236-87-0x0000018927E50000-0x0000018927E60000-memory.dmp

Filesize
64KB

Download
memory/4244-72-0x0000000074C70000-0x0000000075420000-memory.dmp

Filesize
7.7MB

Download
memory/4244-76-0x0000000004EC0000-0x0000000004ED0000-memory.dmp

Filesize
64KB

Download
memory/4244-94-0x0000000004EC0000-0x0000000004ED0000-memory.dmp

Filesize
64KB

Download
memory/4244-95-0x0000000006D30000-0x0000000006DD2000-memory.dmp

Filesize
648KB

Download
memory/4244-96-0x00000000093B0000-0x00000000093E8000-memory.dmp

Filesize
224KB

Download
memory/4244-78-0x0000000006A80000-0x0000000006A9A000-memory.dmp

Filesize
104KB

Download
memory/4244-71-0x0000000000500000-0x0000000000604000-memory.dmp

Filesize
1.0MB

Download
memory/4244-73-0x0000000005500000-0x0000000005AA4000-memory.dmp

Filesize
5.6MB

Download
memory/4244-104-0x0000000074C70000-0x0000000075420000-memory.dmp

Filesize
7.7MB

Download
memory/4244-75-0x0000000004FF0000-0x000000000508C000-memory.dmp

Filesize
624KB

Download
memory/4244-74-0x0000000004F50000-0x0000000004FE2000-memory.dmp

Filesize
584KB

Download
memory/4244-93-0x0000000074C70000-0x0000000075420000-memory.dmp

Filesize
7.7MB

Download
memory/4244-77-0x0000000004EB0000-0x0000000004EBA000-memory.dmp

Filesize
40KB

Download
memory/4424-109-0x0000000000400000-0x0000000000438000-memory.dmp

Filesize
224KB

Download
memory/4424-105-0x0000000000400000-0x0000000000438000-memory.dmp

Filesize
224KB

Download
memory/4424-106-0x0000000000400000-0x0000000000438000-memory.dmp

Filesize
224KB

Download
memory/4424-103-0x0000000000400000-0x0000000000438000-memory.dmp

Filesize
224KB

Download
memory/4424-100-0x0000000000400000-0x0000000000438000-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