Malware Analysis Report

2025-01-03 04:58

Sample ID 220413-v47g4aeafr
Target Inquirypdf.exe
SHA256 aec9eb81f2a2837488165119d41da8eec94607b9bde0b729f811ced008ad95cb
Tags
oski discovery infostealer spyware stealer suricata
score
10/10

Table of Contents

Analysis Overview

MITRE ATT&CK

Enterprise Matrix V6

Analysis: static1

Detonation Overview

Signatures

Analysis: behavioral1

Detonation Overview

Command Line

Signatures

Processes

Network

Files

Analysis: behavioral2

Detonation Overview

Command Line

Signatures

Processes

Network

Files

Analysis Overview

score
10/10

SHA256

aec9eb81f2a2837488165119d41da8eec94607b9bde0b729f811ced008ad95cb

Threat Level: Known bad

The file Inquirypdf.exe was found to be: Known bad.

Malicious Activity Summary

oski discovery infostealer spyware stealer suricata

suricata: ET MALWARE Suspicious Zipped Filename in Outbound POST Request (Passwords.txt)

suricata: ET MALWARE Suspicious Zipped Filename in Outbound POST Request (passwords.txt) M2

suricata: ET MALWARE Suspicious Zipped Filename in Outbound POST Request (Passwords.txt) M2

suricata: ET MALWARE Vidar/Arkei/Megumin/Oski Stealer Data Exfil

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

Oski

Downloads MZ/PE file

Reads user/profile data of web browsers

Deletes itself

Checks computer location settings

Loads dropped DLL

Checks installed software on the system

Accesses cryptocurrency files/wallets, possible credential harvesting

Suspicious use of SetThreadContext

Enumerates physical storage devices

Program crash

Kills process with taskkill

Creates scheduled task(s)

Checks processor information in registry

Suspicious use of WriteProcessMemory

Suspicious use of AdjustPrivilegeToken

Suspicious behavior: EnumeratesProcesses

MITRE ATT&CK

Analysis: static1

Detonation Overview

Reported

2022-04-13 17:33

Signatures

N/A

Analysis: behavioral1

Detonation Overview

Submitted

2022-04-13 17:33

Reported

2022-04-13 17:36

Platform

win7-20220310-en

Max time kernel

4294178s

Max time network

120s

Command Line

"C:\Users\Admin\AppData\Local\Temp\Inquirypdf.exe"

Signatures

Oski

infostealer oski

suricata: ET MALWARE Suspicious Zipped Filename in Outbound POST Request (Passwords.txt)

suricata

suricata: ET MALWARE Suspicious Zipped Filename in Outbound POST Request (Passwords.txt) M2

suricata

suricata: ET MALWARE Suspicious Zipped Filename in Outbound POST Request (passwords.txt) M2

suricata

suricata: ET MALWARE Vidar/Arkei/Megumin/Oski Stealer Data Exfil

suricata

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

suricata

Downloads MZ/PE file

Deletes itself

Description Indicator Process Target
N/A N/A C:\Windows\SysWOW64\cmd.exe N/A

Reads user/profile data of web browsers

spyware stealer

Accesses cryptocurrency files/wallets, possible credential harvesting

spyware

Checks installed software on the system

discovery

Suspicious use of SetThreadContext

Description Indicator Process Target
PID 1428 set thread context of 1852 N/A C:\Users\Admin\AppData\Local\Temp\Inquirypdf.exe C:\Users\Admin\AppData\Local\Temp\Inquirypdf.exe

Enumerates physical storage devices

Checks processor information in registry

Description Indicator Process Target
Key value queried \REGISTRY\MACHINE\HARDWARE\DESCRIPTION\System\CentralProcessor\0\ProcessorNameString C:\Users\Admin\AppData\Local\Temp\Inquirypdf.exe N/A

Creates scheduled task(s)

persistence
Description Indicator Process Target
N/A N/A C:\Windows\SysWOW64\schtasks.exe N/A

Kills process with taskkill

evasion
Description Indicator Process Target
N/A N/A C:\Windows\SysWOW64\taskkill.exe N/A

Suspicious behavior: EnumeratesProcesses

Description Indicator Process Target
N/A N/A C:\Users\Admin\AppData\Local\Temp\Inquirypdf.exe N/A
N/A N/A C:\Users\Admin\AppData\Local\Temp\Inquirypdf.exe N/A
N/A N/A C:\Users\Admin\AppData\Local\Temp\Inquirypdf.exe N/A

Suspicious use of AdjustPrivilegeToken

Description Indicator Process Target
Token: SeDebugPrivilege N/A C:\Users\Admin\AppData\Local\Temp\Inquirypdf.exe N/A
Token: SeDebugPrivilege N/A C:\Windows\SysWOW64\taskkill.exe N/A

Suspicious use of WriteProcessMemory

Description Indicator Process Target
PID 1428 wrote to memory of 1028 N/A C:\Users\Admin\AppData\Local\Temp\Inquirypdf.exe C:\Windows\SysWOW64\schtasks.exe
PID 1428 wrote to memory of 1028 N/A C:\Users\Admin\AppData\Local\Temp\Inquirypdf.exe C:\Windows\SysWOW64\schtasks.exe
PID 1428 wrote to memory of 1028 N/A C:\Users\Admin\AppData\Local\Temp\Inquirypdf.exe C:\Windows\SysWOW64\schtasks.exe
PID 1428 wrote to memory of 1028 N/A C:\Users\Admin\AppData\Local\Temp\Inquirypdf.exe C:\Windows\SysWOW64\schtasks.exe
PID 1428 wrote to memory of 1808 N/A C:\Users\Admin\AppData\Local\Temp\Inquirypdf.exe C:\Users\Admin\AppData\Local\Temp\Inquirypdf.exe
PID 1428 wrote to memory of 1808 N/A C:\Users\Admin\AppData\Local\Temp\Inquirypdf.exe C:\Users\Admin\AppData\Local\Temp\Inquirypdf.exe
PID 1428 wrote to memory of 1808 N/A C:\Users\Admin\AppData\Local\Temp\Inquirypdf.exe C:\Users\Admin\AppData\Local\Temp\Inquirypdf.exe
PID 1428 wrote to memory of 1808 N/A C:\Users\Admin\AppData\Local\Temp\Inquirypdf.exe C:\Users\Admin\AppData\Local\Temp\Inquirypdf.exe
PID 1428 wrote to memory of 804 N/A C:\Users\Admin\AppData\Local\Temp\Inquirypdf.exe C:\Users\Admin\AppData\Local\Temp\Inquirypdf.exe
PID 1428 wrote to memory of 804 N/A C:\Users\Admin\AppData\Local\Temp\Inquirypdf.exe C:\Users\Admin\AppData\Local\Temp\Inquirypdf.exe
PID 1428 wrote to memory of 804 N/A C:\Users\Admin\AppData\Local\Temp\Inquirypdf.exe C:\Users\Admin\AppData\Local\Temp\Inquirypdf.exe
PID 1428 wrote to memory of 804 N/A C:\Users\Admin\AppData\Local\Temp\Inquirypdf.exe C:\Users\Admin\AppData\Local\Temp\Inquirypdf.exe
PID 1428 wrote to memory of 1852 N/A C:\Users\Admin\AppData\Local\Temp\Inquirypdf.exe C:\Users\Admin\AppData\Local\Temp\Inquirypdf.exe
PID 1428 wrote to memory of 1852 N/A C:\Users\Admin\AppData\Local\Temp\Inquirypdf.exe C:\Users\Admin\AppData\Local\Temp\Inquirypdf.exe
PID 1428 wrote to memory of 1852 N/A C:\Users\Admin\AppData\Local\Temp\Inquirypdf.exe C:\Users\Admin\AppData\Local\Temp\Inquirypdf.exe
PID 1428 wrote to memory of 1852 N/A C:\Users\Admin\AppData\Local\Temp\Inquirypdf.exe C:\Users\Admin\AppData\Local\Temp\Inquirypdf.exe
PID 1428 wrote to memory of 1852 N/A C:\Users\Admin\AppData\Local\Temp\Inquirypdf.exe C:\Users\Admin\AppData\Local\Temp\Inquirypdf.exe
PID 1428 wrote to memory of 1852 N/A C:\Users\Admin\AppData\Local\Temp\Inquirypdf.exe C:\Users\Admin\AppData\Local\Temp\Inquirypdf.exe
PID 1428 wrote to memory of 1852 N/A C:\Users\Admin\AppData\Local\Temp\Inquirypdf.exe C:\Users\Admin\AppData\Local\Temp\Inquirypdf.exe
PID 1428 wrote to memory of 1852 N/A C:\Users\Admin\AppData\Local\Temp\Inquirypdf.exe C:\Users\Admin\AppData\Local\Temp\Inquirypdf.exe
PID 1428 wrote to memory of 1852 N/A C:\Users\Admin\AppData\Local\Temp\Inquirypdf.exe C:\Users\Admin\AppData\Local\Temp\Inquirypdf.exe
PID 1428 wrote to memory of 1852 N/A C:\Users\Admin\AppData\Local\Temp\Inquirypdf.exe C:\Users\Admin\AppData\Local\Temp\Inquirypdf.exe
PID 1852 wrote to memory of 1304 N/A C:\Users\Admin\AppData\Local\Temp\Inquirypdf.exe C:\Windows\SysWOW64\cmd.exe
PID 1852 wrote to memory of 1304 N/A C:\Users\Admin\AppData\Local\Temp\Inquirypdf.exe C:\Windows\SysWOW64\cmd.exe
PID 1852 wrote to memory of 1304 N/A C:\Users\Admin\AppData\Local\Temp\Inquirypdf.exe C:\Windows\SysWOW64\cmd.exe
PID 1852 wrote to memory of 1304 N/A C:\Users\Admin\AppData\Local\Temp\Inquirypdf.exe C:\Windows\SysWOW64\cmd.exe
PID 1304 wrote to memory of 800 N/A C:\Windows\SysWOW64\cmd.exe C:\Windows\SysWOW64\taskkill.exe
PID 1304 wrote to memory of 800 N/A C:\Windows\SysWOW64\cmd.exe C:\Windows\SysWOW64\taskkill.exe
PID 1304 wrote to memory of 800 N/A C:\Windows\SysWOW64\cmd.exe C:\Windows\SysWOW64\taskkill.exe
PID 1304 wrote to memory of 800 N/A C:\Windows\SysWOW64\cmd.exe C:\Windows\SysWOW64\taskkill.exe

Processes

C:\Users\Admin\AppData\Local\Temp\Inquirypdf.exe

"C:\Users\Admin\AppData\Local\Temp\Inquirypdf.exe"

C:\Windows\SysWOW64\schtasks.exe

"C:\Windows\System32\schtasks.exe" /Create /TN "Updates\vCTupI" /XML "C:\Users\Admin\AppData\Local\Temp\tmpCC73.tmp"

C:\Users\Admin\AppData\Local\Temp\Inquirypdf.exe

"{path}"

C:\Users\Admin\AppData\Local\Temp\Inquirypdf.exe

"{path}"

C:\Users\Admin\AppData\Local\Temp\Inquirypdf.exe

"{path}"

C:\Windows\SysWOW64\cmd.exe

"C:\Windows\System32\cmd.exe" /c taskkill /pid 1852 & erase C:\Users\Admin\AppData\Local\Temp\Inquirypdf.exe & RD /S /Q C:\\ProgramData\\245778750845286\\* & exit

C:\Windows\SysWOW64\taskkill.exe

taskkill /pid 1852

Network

Country Destination Domain Proto
US 8.8.8.8:53 ndy.derg.tech udp
US 192.185.16.190:80 ndy.derg.tech tcp

Files

memory/1428-54-0x00000000001B0000-0x0000000000226000-memory.dmp

memory/1428-55-0x0000000000390000-0x000000000039A000-memory.dmp

memory/1428-56-0x0000000005460000-0x00000000054DC000-memory.dmp

memory/1428-57-0x00000000004F0000-0x0000000000528000-memory.dmp

memory/1028-58-0x0000000000000000-mapping.dmp

C:\Users\Admin\AppData\Local\Temp\tmpCC73.tmp

MD5 d6dd49c4c5303793b84f18e2bc94cbb1
SHA1 6ac8379d44d48a4485404d654a5fb095ea550c5a
SHA256 2d8f6e48a6603518024d0cb787060aaaafbc4ae95587733432f23c6726974d4c
SHA512 3e73a25abda5c8a7502dbdcc871aed1ac1c893e56cd2521b538030066cfebb2a56c0389d34705b568ee15aac182e1eecf60af6a9530d599afc731af140c00c06

memory/1852-60-0x0000000000400000-0x0000000000438000-memory.dmp

memory/1852-61-0x0000000000400000-0x0000000000438000-memory.dmp

memory/1852-63-0x0000000000400000-0x0000000000438000-memory.dmp

memory/1852-65-0x0000000000400000-0x0000000000438000-memory.dmp

memory/1852-67-0x0000000000400000-0x0000000000438000-memory.dmp

memory/1852-69-0x0000000000400000-0x0000000000438000-memory.dmp

memory/1852-70-0x000000000040717B-mapping.dmp

memory/1852-72-0x0000000000400000-0x0000000000438000-memory.dmp

memory/1852-73-0x0000000074DE1000-0x0000000074DE3000-memory.dmp

memory/1852-74-0x0000000000400000-0x0000000000438000-memory.dmp

\ProgramData\sqlite3.dll

MD5 e477a96c8f2b18d6b5c27bde49c990bf
SHA1 e980c9bf41330d1e5bd04556db4646a0210f7409
SHA256 16574f51785b0e2fc29c2c61477eb47bb39f714829999511dc8952b43ab17660
SHA512 335a86268e7c0e568b1c30981ec644e6cd332e66f96d2551b58a82515316693c1859d87b4f4b7310cf1ac386cee671580fdd999c3bcb23acf2c2282c01c8798c

\ProgramData\nss3.dll

MD5 bfac4e3c5908856ba17d41edcd455a51
SHA1 8eec7e888767aa9e4cca8ff246eb2aacb9170428
SHA256 e2935b5b28550d47dc971f456d6961f20d1633b4892998750140e0eaa9ae9d78
SHA512 2565bab776c4d732ffb1f9b415992a4c65b81bcd644a9a1df1333a269e322925fc1df4f76913463296efd7c88ef194c3056de2f1ca1357d7b5fe5ff0da877a66

\ProgramData\mozglue.dll

MD5 8f73c08a9660691143661bf7332c3c27
SHA1 37fa65dd737c50fda710fdbde89e51374d0c204a
SHA256 3fe6b1c54b8cf28f571e0c5d6636b4069a8ab00b4f11dd842cfec00691d0c9cd
SHA512 0042ecf9b3571bb5eba2de893e8b2371df18f7c5a589f52ee66e4bfbaa15a5b8b7cc6a155792aaa8988528c27196896d5e82e1751c998bacea0d92395f66ad89

memory/1304-78-0x0000000000000000-mapping.dmp

memory/800-79-0x0000000000000000-mapping.dmp

Analysis: behavioral2

Detonation Overview

Submitted

2022-04-13 17:33

Reported

2022-04-13 17:36

Platform

win10v2004-20220331-en

Max time kernel

135s

Max time network

150s

Command Line

"C:\Users\Admin\AppData\Local\Temp\Inquirypdf.exe"

Signatures

Oski

infostealer oski

Checks computer location settings

Description Indicator Process Target
Key value queried \REGISTRY\USER\S-1-5-21-157025953-3125636059-437143553-1000\Control Panel\International\Geo\Nation C:\Users\Admin\AppData\Local\Temp\Inquirypdf.exe N/A

Suspicious use of SetThreadContext

Description Indicator Process Target
PID 3488 set thread context of 4384 N/A C:\Users\Admin\AppData\Local\Temp\Inquirypdf.exe C:\Users\Admin\AppData\Local\Temp\Inquirypdf.exe

Enumerates physical storage devices

Program crash

Description Indicator Process Target
N/A N/A C:\Windows\SysWOW64\WerFault.exe C:\Users\Admin\AppData\Local\Temp\Inquirypdf.exe

Creates scheduled task(s)

persistence
Description Indicator Process Target
N/A N/A C:\Windows\SysWOW64\schtasks.exe N/A

Suspicious behavior: EnumeratesProcesses

Description Indicator Process Target
N/A N/A C:\Users\Admin\AppData\Local\Temp\Inquirypdf.exe N/A
N/A N/A C:\Users\Admin\AppData\Local\Temp\Inquirypdf.exe N/A
N/A N/A C:\Users\Admin\AppData\Local\Temp\Inquirypdf.exe N/A

Suspicious use of AdjustPrivilegeToken

Description Indicator Process Target
Token: SeDebugPrivilege N/A C:\Users\Admin\AppData\Local\Temp\Inquirypdf.exe N/A

Suspicious use of WriteProcessMemory

Description Indicator Process Target
PID 3488 wrote to memory of 808 N/A C:\Users\Admin\AppData\Local\Temp\Inquirypdf.exe C:\Windows\SysWOW64\schtasks.exe
PID 3488 wrote to memory of 808 N/A C:\Users\Admin\AppData\Local\Temp\Inquirypdf.exe C:\Windows\SysWOW64\schtasks.exe
PID 3488 wrote to memory of 808 N/A C:\Users\Admin\AppData\Local\Temp\Inquirypdf.exe C:\Windows\SysWOW64\schtasks.exe
PID 3488 wrote to memory of 4252 N/A C:\Users\Admin\AppData\Local\Temp\Inquirypdf.exe C:\Users\Admin\AppData\Local\Temp\Inquirypdf.exe
PID 3488 wrote to memory of 4252 N/A C:\Users\Admin\AppData\Local\Temp\Inquirypdf.exe C:\Users\Admin\AppData\Local\Temp\Inquirypdf.exe
PID 3488 wrote to memory of 4252 N/A C:\Users\Admin\AppData\Local\Temp\Inquirypdf.exe C:\Users\Admin\AppData\Local\Temp\Inquirypdf.exe
PID 3488 wrote to memory of 4384 N/A C:\Users\Admin\AppData\Local\Temp\Inquirypdf.exe C:\Users\Admin\AppData\Local\Temp\Inquirypdf.exe
PID 3488 wrote to memory of 4384 N/A C:\Users\Admin\AppData\Local\Temp\Inquirypdf.exe C:\Users\Admin\AppData\Local\Temp\Inquirypdf.exe
PID 3488 wrote to memory of 4384 N/A C:\Users\Admin\AppData\Local\Temp\Inquirypdf.exe C:\Users\Admin\AppData\Local\Temp\Inquirypdf.exe
PID 3488 wrote to memory of 4384 N/A C:\Users\Admin\AppData\Local\Temp\Inquirypdf.exe C:\Users\Admin\AppData\Local\Temp\Inquirypdf.exe
PID 3488 wrote to memory of 4384 N/A C:\Users\Admin\AppData\Local\Temp\Inquirypdf.exe C:\Users\Admin\AppData\Local\Temp\Inquirypdf.exe
PID 3488 wrote to memory of 4384 N/A C:\Users\Admin\AppData\Local\Temp\Inquirypdf.exe C:\Users\Admin\AppData\Local\Temp\Inquirypdf.exe
PID 3488 wrote to memory of 4384 N/A C:\Users\Admin\AppData\Local\Temp\Inquirypdf.exe C:\Users\Admin\AppData\Local\Temp\Inquirypdf.exe
PID 3488 wrote to memory of 4384 N/A C:\Users\Admin\AppData\Local\Temp\Inquirypdf.exe C:\Users\Admin\AppData\Local\Temp\Inquirypdf.exe
PID 3488 wrote to memory of 4384 N/A C:\Users\Admin\AppData\Local\Temp\Inquirypdf.exe C:\Users\Admin\AppData\Local\Temp\Inquirypdf.exe

Processes

C:\Users\Admin\AppData\Local\Temp\Inquirypdf.exe

"C:\Users\Admin\AppData\Local\Temp\Inquirypdf.exe"

C:\Windows\SysWOW64\schtasks.exe

"C:\Windows\System32\schtasks.exe" /Create /TN "Updates\vCTupI" /XML "C:\Users\Admin\AppData\Local\Temp\tmpBF3E.tmp"

C:\Users\Admin\AppData\Local\Temp\Inquirypdf.exe

"{path}"

C:\Users\Admin\AppData\Local\Temp\Inquirypdf.exe

"{path}"

C:\Windows\SysWOW64\WerFault.exe

C:\Windows\SysWOW64\WerFault.exe -pss -s 432 -p 4384 -ip 4384

C:\Windows\SysWOW64\WerFault.exe

C:\Windows\SysWOW64\WerFault.exe -u -p 4384 -s 236

Network

Country Destination Domain Proto
US 8.8.8.8:53 crl4.digicert.com udp
US 93.184.220.29:80 crl4.digicert.com tcp
US 93.184.220.29:80 crl4.digicert.com tcp
US 52.168.112.66:443 tcp
US 93.184.220.29:80 crl4.digicert.com tcp
FI 62.115.252.112:80 tcp

Files

memory/3488-124-0x0000000000580000-0x00000000005F6000-memory.dmp

memory/3488-125-0x0000000005490000-0x0000000005A34000-memory.dmp

memory/3488-126-0x0000000004FC0000-0x0000000005052000-memory.dmp

memory/3488-127-0x0000000005060000-0x00000000050FC000-memory.dmp

memory/3488-128-0x0000000004FA0000-0x0000000004FAA000-memory.dmp

memory/808-129-0x0000000000000000-mapping.dmp

C:\Users\Admin\AppData\Local\Temp\tmpBF3E.tmp

MD5 44998581395b24278c90a076bb6d9db8
SHA1 279bba33541d890d103e775aa7e3628c7cf5dee3
SHA256 facf69c4cb336856f289d9d0cd7dcd5e152f1908c837bdf4c12e697cc3f3072c
SHA512 c52a676f3a55f8f505826a16f5a49136bb4dbaceaf2d43b27d9ae6e5a9d16c8fba68c39099743f08bb05d02cc3bebde303eccced0c7611224d74a7f95677f865

memory/4252-131-0x0000000000000000-mapping.dmp

memory/4384-132-0x0000000000000000-mapping.dmp

memory/4384-133-0x0000000000400000-0x0000000000438000-memory.dmp

memory/4384-134-0x0000000000400000-0x0000000000438000-memory.dmp

memory/4384-135-0x0000000000400000-0x0000000000438000-memory.dmp