Malware Analysis Report

2025-01-03 04:58

Sample ID 220413-v3n95aebc5
Target Inquirypdf.exe
SHA256 aec9eb81f2a2837488165119d41da8eec94607b9bde0b729f811ced008ad95cb
Tags
oski infostealer discovery spyware stealer
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 infostealer discovery spyware stealer

Oski

Downloads MZ/PE file

Reads user/profile data of web browsers

Loads dropped DLL

Checks computer location settings

Checks installed software on the system

Accesses cryptocurrency files/wallets, possible credential harvesting

Suspicious use of SetThreadContext

Program crash

Enumerates physical storage devices

Checks processor information in registry

Kills process with taskkill

Creates scheduled task(s)

Suspicious use of AdjustPrivilegeToken

Suspicious use of WriteProcessMemory

Suspicious behavior: EnumeratesProcesses

MITRE ATT&CK

Analysis: static1

Detonation Overview

Reported

2022-04-13 17:31

Signatures

N/A

Analysis: behavioral1

Detonation Overview

Submitted

2022-04-13 17:31

Reported

2022-04-13 17:33

Platform

win7-20220331-en

Max time kernel

32s

Max time network

45s

Command Line

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

Signatures

Oski

infostealer oski

Suspicious use of SetThreadContext

Description Indicator Process Target
PID 552 set thread context of 2004 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

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 552 wrote to memory of 1876 N/A C:\Users\Admin\AppData\Local\Temp\Inquirypdf.exe C:\Windows\SysWOW64\schtasks.exe
PID 552 wrote to memory of 1876 N/A C:\Users\Admin\AppData\Local\Temp\Inquirypdf.exe C:\Windows\SysWOW64\schtasks.exe
PID 552 wrote to memory of 1876 N/A C:\Users\Admin\AppData\Local\Temp\Inquirypdf.exe C:\Windows\SysWOW64\schtasks.exe
PID 552 wrote to memory of 1876 N/A C:\Users\Admin\AppData\Local\Temp\Inquirypdf.exe C:\Windows\SysWOW64\schtasks.exe
PID 552 wrote to memory of 2004 N/A C:\Users\Admin\AppData\Local\Temp\Inquirypdf.exe C:\Users\Admin\AppData\Local\Temp\Inquirypdf.exe
PID 552 wrote to memory of 2004 N/A C:\Users\Admin\AppData\Local\Temp\Inquirypdf.exe C:\Users\Admin\AppData\Local\Temp\Inquirypdf.exe
PID 552 wrote to memory of 2004 N/A C:\Users\Admin\AppData\Local\Temp\Inquirypdf.exe C:\Users\Admin\AppData\Local\Temp\Inquirypdf.exe
PID 552 wrote to memory of 2004 N/A C:\Users\Admin\AppData\Local\Temp\Inquirypdf.exe C:\Users\Admin\AppData\Local\Temp\Inquirypdf.exe
PID 552 wrote to memory of 2004 N/A C:\Users\Admin\AppData\Local\Temp\Inquirypdf.exe C:\Users\Admin\AppData\Local\Temp\Inquirypdf.exe
PID 552 wrote to memory of 2004 N/A C:\Users\Admin\AppData\Local\Temp\Inquirypdf.exe C:\Users\Admin\AppData\Local\Temp\Inquirypdf.exe
PID 552 wrote to memory of 2004 N/A C:\Users\Admin\AppData\Local\Temp\Inquirypdf.exe C:\Users\Admin\AppData\Local\Temp\Inquirypdf.exe
PID 552 wrote to memory of 2004 N/A C:\Users\Admin\AppData\Local\Temp\Inquirypdf.exe C:\Users\Admin\AppData\Local\Temp\Inquirypdf.exe
PID 552 wrote to memory of 2004 N/A C:\Users\Admin\AppData\Local\Temp\Inquirypdf.exe C:\Users\Admin\AppData\Local\Temp\Inquirypdf.exe
PID 552 wrote to memory of 2004 N/A C:\Users\Admin\AppData\Local\Temp\Inquirypdf.exe C:\Users\Admin\AppData\Local\Temp\Inquirypdf.exe
PID 2004 wrote to memory of 1988 N/A C:\Users\Admin\AppData\Local\Temp\Inquirypdf.exe C:\Windows\SysWOW64\WerFault.exe
PID 2004 wrote to memory of 1988 N/A C:\Users\Admin\AppData\Local\Temp\Inquirypdf.exe C:\Windows\SysWOW64\WerFault.exe
PID 2004 wrote to memory of 1988 N/A C:\Users\Admin\AppData\Local\Temp\Inquirypdf.exe C:\Windows\SysWOW64\WerFault.exe
PID 2004 wrote to memory of 1988 N/A C:\Users\Admin\AppData\Local\Temp\Inquirypdf.exe C:\Windows\SysWOW64\WerFault.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\tmp8113.tmp"

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

"{path}"

C:\Windows\SysWOW64\WerFault.exe

C:\Windows\SysWOW64\WerFault.exe -u -p 2004 -s 112

Network

N/A

Files

memory/552-54-0x00000000011C0000-0x0000000001236000-memory.dmp

memory/552-55-0x00000000005D0000-0x00000000005DA000-memory.dmp

memory/552-56-0x0000000004D00000-0x0000000004D7C000-memory.dmp

memory/552-57-0x00000000046C0000-0x00000000046F8000-memory.dmp

memory/1876-58-0x0000000000000000-mapping.dmp

C:\Users\Admin\AppData\Local\Temp\tmp8113.tmp

MD5 f84ba231d4ee55d7b0b342700955c97a
SHA1 b78ceee269f92201e1513c150255a02b79f800cd
SHA256 574301f282c7006e67a1d4496d7d879a4b74e13bdce7189fca2661cc249492d4
SHA512 491bceb4c5d557d824285cc4ae1461ed6d38f01016342b770d7790ddad00248e58d4c56b92f7ef55fcdcc00d67d32bef3c078f1e6bc4db85f87a282a853e1342

memory/2004-61-0x0000000000400000-0x0000000000438000-memory.dmp

memory/2004-60-0x0000000000400000-0x0000000000438000-memory.dmp

memory/2004-63-0x0000000000400000-0x0000000000438000-memory.dmp

memory/2004-65-0x0000000000400000-0x0000000000438000-memory.dmp

memory/2004-67-0x0000000000400000-0x0000000000438000-memory.dmp

memory/2004-69-0x0000000000400000-0x0000000000438000-memory.dmp

memory/2004-70-0x000000000040717B-mapping.dmp

memory/2004-72-0x0000000000400000-0x0000000000438000-memory.dmp

memory/1988-73-0x0000000000000000-mapping.dmp

Analysis: behavioral2

Detonation Overview

Submitted

2022-04-13 17:31

Reported

2022-04-13 17:33

Platform

win10v2004-en-20220113

Max time kernel

132s

Max time network

135s

Command Line

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

Signatures

Oski

infostealer oski

Downloads MZ/PE file

Checks computer location settings

Description Indicator Process Target
Key value queried \REGISTRY\USER\S-1-5-21-1346565761-3498240568-4147300184-1000\Control Panel\International\Geo\Nation C:\Users\Admin\AppData\Local\Temp\Inquirypdf.exe N/A
Key value queried \REGISTRY\USER\S-1-5-21-1346565761-3498240568-4147300184-1000\Control Panel\International\Geo\Nation C:\Users\Admin\AppData\Local\Temp\Inquirypdf.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 2380 set thread context of 912 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 2380 wrote to memory of 4740 N/A C:\Users\Admin\AppData\Local\Temp\Inquirypdf.exe C:\Windows\SysWOW64\schtasks.exe
PID 2380 wrote to memory of 4740 N/A C:\Users\Admin\AppData\Local\Temp\Inquirypdf.exe C:\Windows\SysWOW64\schtasks.exe
PID 2380 wrote to memory of 4740 N/A C:\Users\Admin\AppData\Local\Temp\Inquirypdf.exe C:\Windows\SysWOW64\schtasks.exe
PID 2380 wrote to memory of 680 N/A C:\Users\Admin\AppData\Local\Temp\Inquirypdf.exe C:\Users\Admin\AppData\Local\Temp\Inquirypdf.exe
PID 2380 wrote to memory of 680 N/A C:\Users\Admin\AppData\Local\Temp\Inquirypdf.exe C:\Users\Admin\AppData\Local\Temp\Inquirypdf.exe
PID 2380 wrote to memory of 680 N/A C:\Users\Admin\AppData\Local\Temp\Inquirypdf.exe C:\Users\Admin\AppData\Local\Temp\Inquirypdf.exe
PID 2380 wrote to memory of 912 N/A C:\Users\Admin\AppData\Local\Temp\Inquirypdf.exe C:\Users\Admin\AppData\Local\Temp\Inquirypdf.exe
PID 2380 wrote to memory of 912 N/A C:\Users\Admin\AppData\Local\Temp\Inquirypdf.exe C:\Users\Admin\AppData\Local\Temp\Inquirypdf.exe
PID 2380 wrote to memory of 912 N/A C:\Users\Admin\AppData\Local\Temp\Inquirypdf.exe C:\Users\Admin\AppData\Local\Temp\Inquirypdf.exe
PID 2380 wrote to memory of 912 N/A C:\Users\Admin\AppData\Local\Temp\Inquirypdf.exe C:\Users\Admin\AppData\Local\Temp\Inquirypdf.exe
PID 2380 wrote to memory of 912 N/A C:\Users\Admin\AppData\Local\Temp\Inquirypdf.exe C:\Users\Admin\AppData\Local\Temp\Inquirypdf.exe
PID 2380 wrote to memory of 912 N/A C:\Users\Admin\AppData\Local\Temp\Inquirypdf.exe C:\Users\Admin\AppData\Local\Temp\Inquirypdf.exe
PID 2380 wrote to memory of 912 N/A C:\Users\Admin\AppData\Local\Temp\Inquirypdf.exe C:\Users\Admin\AppData\Local\Temp\Inquirypdf.exe
PID 2380 wrote to memory of 912 N/A C:\Users\Admin\AppData\Local\Temp\Inquirypdf.exe C:\Users\Admin\AppData\Local\Temp\Inquirypdf.exe
PID 2380 wrote to memory of 912 N/A C:\Users\Admin\AppData\Local\Temp\Inquirypdf.exe C:\Users\Admin\AppData\Local\Temp\Inquirypdf.exe
PID 912 wrote to memory of 3496 N/A C:\Users\Admin\AppData\Local\Temp\Inquirypdf.exe C:\Windows\SysWOW64\cmd.exe
PID 912 wrote to memory of 3496 N/A C:\Users\Admin\AppData\Local\Temp\Inquirypdf.exe C:\Windows\SysWOW64\cmd.exe
PID 912 wrote to memory of 3496 N/A C:\Users\Admin\AppData\Local\Temp\Inquirypdf.exe C:\Windows\SysWOW64\cmd.exe
PID 3496 wrote to memory of 2852 N/A C:\Windows\SysWOW64\cmd.exe C:\Windows\SysWOW64\taskkill.exe
PID 3496 wrote to memory of 2852 N/A C:\Windows\SysWOW64\cmd.exe C:\Windows\SysWOW64\taskkill.exe
PID 3496 wrote to memory of 2852 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\tmpA601.tmp"

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 912 & erase C:\Users\Admin\AppData\Local\Temp\Inquirypdf.exe & RD /S /Q C:\\ProgramData\\248520125636642\\* & exit

C:\Windows\SysWOW64\taskkill.exe

taskkill /pid 912

Network

Country Destination Domain Proto
NL 88.221.144.170:80 tcp
NL 88.221.144.170:80 tcp
US 8.8.8.8:53 ndy.derg.tech udp
US 192.185.16.190:80 ndy.derg.tech tcp
N/A 224.0.0.251:5353 udp

Files

memory/2380-130-0x0000000000830000-0x00000000008A6000-memory.dmp

memory/2380-131-0x0000000005830000-0x0000000005DD4000-memory.dmp

memory/2380-132-0x0000000005280000-0x0000000005312000-memory.dmp

memory/2380-133-0x0000000005320000-0x00000000053BC000-memory.dmp

memory/2380-134-0x0000000005240000-0x000000000524A000-memory.dmp

memory/4740-135-0x0000000000000000-mapping.dmp

C:\Users\Admin\AppData\Local\Temp\tmpA601.tmp

MD5 d584120bab6f3f06a0e71a403fa9732b
SHA1 4a6936b0d687f1a80201ba794b70f7df7a492cec
SHA256 b4dfa23c4f96367f3cb69e80e16bc5c3709c2387d6712ec9566da47645083c76
SHA512 48913548e6969ac7719b9fc26223bc8ea866e025a398a1199b545e284695ecbc1d29820576f38ebf08adc1f2aa18814df03fe0cbe9152c9590a6f588e879dddb

memory/680-137-0x0000000000000000-mapping.dmp

memory/912-138-0x0000000000000000-mapping.dmp

memory/912-139-0x0000000000400000-0x0000000000438000-memory.dmp

memory/912-140-0x0000000000400000-0x0000000000438000-memory.dmp

memory/912-141-0x0000000000400000-0x0000000000438000-memory.dmp

memory/912-142-0x0000000000400000-0x0000000000438000-memory.dmp

C:\ProgramData\sqlite3.dll

MD5 e477a96c8f2b18d6b5c27bde49c990bf
SHA1 e980c9bf41330d1e5bd04556db4646a0210f7409
SHA256 16574f51785b0e2fc29c2c61477eb47bb39f714829999511dc8952b43ab17660
SHA512 335a86268e7c0e568b1c30981ec644e6cd332e66f96d2551b58a82515316693c1859d87b4f4b7310cf1ac386cee671580fdd999c3bcb23acf2c2282c01c8798c

C:\ProgramData\nss3.dll

MD5 bfac4e3c5908856ba17d41edcd455a51
SHA1 8eec7e888767aa9e4cca8ff246eb2aacb9170428
SHA256 e2935b5b28550d47dc971f456d6961f20d1633b4892998750140e0eaa9ae9d78
SHA512 2565bab776c4d732ffb1f9b415992a4c65b81bcd644a9a1df1333a269e322925fc1df4f76913463296efd7c88ef194c3056de2f1ca1357d7b5fe5ff0da877a66

C:\ProgramData\mozglue.dll

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

memory/3496-146-0x0000000000000000-mapping.dmp

memory/2852-147-0x0000000000000000-mapping.dmp