Malware Analysis Report

2025-01-03 04:56

Sample ID 220330-cj9slseed7
Target 8577d33d01e9b4d70ba0abef53c03277.exe
SHA256 913a7c8a88dc0720ff7fe2005243939f2fdadc129f69a46cc8fcfe54a16f0e75
Tags
oski infostealer 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

913a7c8a88dc0720ff7fe2005243939f2fdadc129f69a46cc8fcfe54a16f0e75

Threat Level: Known bad

The file 8577d33d01e9b4d70ba0abef53c03277.exe was found to be: Known bad.

Malicious Activity Summary

oski infostealer spyware stealer

Oski

Executes dropped EXE

Reads user/profile data of web browsers

Loads dropped DLL

Enumerates physical storage devices

Program crash

NSIS installer

Suspicious use of WriteProcessMemory

MITRE ATT&CK

Analysis: static1

Detonation Overview

Reported

2022-03-30 02:07

Signatures

NSIS installer

installer
Description Indicator Process Target
N/A N/A N/A N/A
N/A N/A N/A N/A

Analysis: behavioral1

Detonation Overview

Submitted

2022-03-30 02:07

Reported

2022-03-30 02:10

Platform

win7-20220311-en

Max time kernel

4294177s

Max time network

120s

Command Line

"C:\Users\Admin\AppData\Local\Temp\8577d33d01e9b4d70ba0abef53c03277.exe"

Signatures

Oski

infostealer oski

Executes dropped EXE

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

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\bbjjgn.exe

Suspicious use of WriteProcessMemory

Description Indicator Process Target
PID 1684 wrote to memory of 560 N/A C:\Users\Admin\AppData\Local\Temp\8577d33d01e9b4d70ba0abef53c03277.exe C:\Users\Admin\AppData\Local\Temp\bbjjgn.exe
PID 1684 wrote to memory of 560 N/A C:\Users\Admin\AppData\Local\Temp\8577d33d01e9b4d70ba0abef53c03277.exe C:\Users\Admin\AppData\Local\Temp\bbjjgn.exe
PID 1684 wrote to memory of 560 N/A C:\Users\Admin\AppData\Local\Temp\8577d33d01e9b4d70ba0abef53c03277.exe C:\Users\Admin\AppData\Local\Temp\bbjjgn.exe
PID 1684 wrote to memory of 560 N/A C:\Users\Admin\AppData\Local\Temp\8577d33d01e9b4d70ba0abef53c03277.exe C:\Users\Admin\AppData\Local\Temp\bbjjgn.exe
PID 560 wrote to memory of 1112 N/A C:\Users\Admin\AppData\Local\Temp\bbjjgn.exe C:\Users\Admin\AppData\Local\Temp\bbjjgn.exe
PID 560 wrote to memory of 1112 N/A C:\Users\Admin\AppData\Local\Temp\bbjjgn.exe C:\Users\Admin\AppData\Local\Temp\bbjjgn.exe
PID 560 wrote to memory of 1112 N/A C:\Users\Admin\AppData\Local\Temp\bbjjgn.exe C:\Users\Admin\AppData\Local\Temp\bbjjgn.exe
PID 560 wrote to memory of 1112 N/A C:\Users\Admin\AppData\Local\Temp\bbjjgn.exe C:\Users\Admin\AppData\Local\Temp\bbjjgn.exe
PID 560 wrote to memory of 1112 N/A C:\Users\Admin\AppData\Local\Temp\bbjjgn.exe C:\Users\Admin\AppData\Local\Temp\bbjjgn.exe
PID 560 wrote to memory of 1112 N/A C:\Users\Admin\AppData\Local\Temp\bbjjgn.exe C:\Users\Admin\AppData\Local\Temp\bbjjgn.exe
PID 560 wrote to memory of 1112 N/A C:\Users\Admin\AppData\Local\Temp\bbjjgn.exe C:\Users\Admin\AppData\Local\Temp\bbjjgn.exe
PID 560 wrote to memory of 1112 N/A C:\Users\Admin\AppData\Local\Temp\bbjjgn.exe C:\Users\Admin\AppData\Local\Temp\bbjjgn.exe
PID 560 wrote to memory of 1112 N/A C:\Users\Admin\AppData\Local\Temp\bbjjgn.exe C:\Users\Admin\AppData\Local\Temp\bbjjgn.exe
PID 560 wrote to memory of 1112 N/A C:\Users\Admin\AppData\Local\Temp\bbjjgn.exe C:\Users\Admin\AppData\Local\Temp\bbjjgn.exe
PID 1112 wrote to memory of 1696 N/A C:\Users\Admin\AppData\Local\Temp\bbjjgn.exe C:\Windows\SysWOW64\WerFault.exe
PID 1112 wrote to memory of 1696 N/A C:\Users\Admin\AppData\Local\Temp\bbjjgn.exe C:\Windows\SysWOW64\WerFault.exe
PID 1112 wrote to memory of 1696 N/A C:\Users\Admin\AppData\Local\Temp\bbjjgn.exe C:\Windows\SysWOW64\WerFault.exe
PID 1112 wrote to memory of 1696 N/A C:\Users\Admin\AppData\Local\Temp\bbjjgn.exe C:\Windows\SysWOW64\WerFault.exe

Processes

C:\Users\Admin\AppData\Local\Temp\8577d33d01e9b4d70ba0abef53c03277.exe

"C:\Users\Admin\AppData\Local\Temp\8577d33d01e9b4d70ba0abef53c03277.exe"

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

C:\Users\Admin\AppData\Local\Temp\bbjjgn.exe C:\Users\Admin\AppData\Local\Temp\gqrgzrmb

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

C:\Users\Admin\AppData\Local\Temp\bbjjgn.exe C:\Users\Admin\AppData\Local\Temp\gqrgzrmb

C:\Windows\SysWOW64\WerFault.exe

C:\Windows\SysWOW64\WerFault.exe -u -p 1112 -s 112

Network

N/A

Files

memory/1684-54-0x0000000075841000-0x0000000075843000-memory.dmp

\Users\Admin\AppData\Local\Temp\bbjjgn.exe

MD5 55c5d5f188d7d14b75e90d81bbedb15b
SHA1 698e0272fe1dc6368a6d50e3ae9d12184098639e
SHA256 74bfefcce9e8c2e34558f25efdaee37e2ba7db59e40965859065a2e408a75770
SHA512 5f105e09abb2c67e5bec9271cb1bd1a96f93b1ccbd420ad987f8d39a2e8c7268e5f8ac7f0ef2630137a82f165231206fcbe21ef6695bc69cb39229de4a5baf08

\Users\Admin\AppData\Local\Temp\bbjjgn.exe

MD5 55c5d5f188d7d14b75e90d81bbedb15b
SHA1 698e0272fe1dc6368a6d50e3ae9d12184098639e
SHA256 74bfefcce9e8c2e34558f25efdaee37e2ba7db59e40965859065a2e408a75770
SHA512 5f105e09abb2c67e5bec9271cb1bd1a96f93b1ccbd420ad987f8d39a2e8c7268e5f8ac7f0ef2630137a82f165231206fcbe21ef6695bc69cb39229de4a5baf08

memory/560-57-0x0000000000000000-mapping.dmp

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

MD5 55c5d5f188d7d14b75e90d81bbedb15b
SHA1 698e0272fe1dc6368a6d50e3ae9d12184098639e
SHA256 74bfefcce9e8c2e34558f25efdaee37e2ba7db59e40965859065a2e408a75770
SHA512 5f105e09abb2c67e5bec9271cb1bd1a96f93b1ccbd420ad987f8d39a2e8c7268e5f8ac7f0ef2630137a82f165231206fcbe21ef6695bc69cb39229de4a5baf08

C:\Users\Admin\AppData\Local\Temp\gqrgzrmb

MD5 ec86abe57beb8a315221634c1163d772
SHA1 3c1f4ae6ba50b2a900147659669318f65df8b4d8
SHA256 6241a6b459412efd44fe4bca18f57d802dff4682211c15bf970ddb34cfc95e4b
SHA512 444227f8b3db866d057be1c583f8c043a44a2899457ce2c3843a7f69bb318ec0961cb0bc2dfac384bc5631b38422eda5514167fd83b00820d052babff0aa1f85

C:\Users\Admin\AppData\Local\Temp\yqjkc03awp

MD5 d5c7c2dc6891be5104aa4c826890772a
SHA1 21b86d278094e84fce3f455524160f4e81c673fc
SHA256 00b831f5cccded55477fd0fe55d554a7375daae88c815b8cc3ef793f7a4e3ae5
SHA512 afa170c230f718edbd53a9ec9e570c73c28ca4d2f8ded477584262e49fcef3389d1e76bb79fc6bec70fb1f68aa9194c09d35f42dae4e2b2969203fbb251d9f0d

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

MD5 55c5d5f188d7d14b75e90d81bbedb15b
SHA1 698e0272fe1dc6368a6d50e3ae9d12184098639e
SHA256 74bfefcce9e8c2e34558f25efdaee37e2ba7db59e40965859065a2e408a75770
SHA512 5f105e09abb2c67e5bec9271cb1bd1a96f93b1ccbd420ad987f8d39a2e8c7268e5f8ac7f0ef2630137a82f165231206fcbe21ef6695bc69cb39229de4a5baf08

\Users\Admin\AppData\Local\Temp\bbjjgn.exe

MD5 55c5d5f188d7d14b75e90d81bbedb15b
SHA1 698e0272fe1dc6368a6d50e3ae9d12184098639e
SHA256 74bfefcce9e8c2e34558f25efdaee37e2ba7db59e40965859065a2e408a75770
SHA512 5f105e09abb2c67e5bec9271cb1bd1a96f93b1ccbd420ad987f8d39a2e8c7268e5f8ac7f0ef2630137a82f165231206fcbe21ef6695bc69cb39229de4a5baf08

memory/1112-66-0x0000000000090000-0x00000000000C8000-memory.dmp

memory/1112-69-0x0000000000090000-0x00000000000C8000-memory.dmp

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

MD5 55c5d5f188d7d14b75e90d81bbedb15b
SHA1 698e0272fe1dc6368a6d50e3ae9d12184098639e
SHA256 74bfefcce9e8c2e34558f25efdaee37e2ba7db59e40965859065a2e408a75770
SHA512 5f105e09abb2c67e5bec9271cb1bd1a96f93b1ccbd420ad987f8d39a2e8c7268e5f8ac7f0ef2630137a82f165231206fcbe21ef6695bc69cb39229de4a5baf08

memory/1112-64-0x0000000000000000-mapping.dmp

memory/1112-72-0x0000000000090000-0x00000000000C8000-memory.dmp

memory/1696-73-0x0000000000000000-mapping.dmp

\Users\Admin\AppData\Local\Temp\bbjjgn.exe

MD5 55c5d5f188d7d14b75e90d81bbedb15b
SHA1 698e0272fe1dc6368a6d50e3ae9d12184098639e
SHA256 74bfefcce9e8c2e34558f25efdaee37e2ba7db59e40965859065a2e408a75770
SHA512 5f105e09abb2c67e5bec9271cb1bd1a96f93b1ccbd420ad987f8d39a2e8c7268e5f8ac7f0ef2630137a82f165231206fcbe21ef6695bc69cb39229de4a5baf08

\Users\Admin\AppData\Local\Temp\bbjjgn.exe

MD5 55c5d5f188d7d14b75e90d81bbedb15b
SHA1 698e0272fe1dc6368a6d50e3ae9d12184098639e
SHA256 74bfefcce9e8c2e34558f25efdaee37e2ba7db59e40965859065a2e408a75770
SHA512 5f105e09abb2c67e5bec9271cb1bd1a96f93b1ccbd420ad987f8d39a2e8c7268e5f8ac7f0ef2630137a82f165231206fcbe21ef6695bc69cb39229de4a5baf08

\Users\Admin\AppData\Local\Temp\bbjjgn.exe

MD5 55c5d5f188d7d14b75e90d81bbedb15b
SHA1 698e0272fe1dc6368a6d50e3ae9d12184098639e
SHA256 74bfefcce9e8c2e34558f25efdaee37e2ba7db59e40965859065a2e408a75770
SHA512 5f105e09abb2c67e5bec9271cb1bd1a96f93b1ccbd420ad987f8d39a2e8c7268e5f8ac7f0ef2630137a82f165231206fcbe21ef6695bc69cb39229de4a5baf08

Analysis: behavioral2

Detonation Overview

Submitted

2022-03-30 02:07

Reported

2022-03-30 02:10

Platform

win10v2004-en-20220113

Max time kernel

132s

Max time network

136s

Command Line

"C:\Users\Admin\AppData\Local\Temp\8577d33d01e9b4d70ba0abef53c03277.exe"

Signatures

Oski

infostealer oski

Executes dropped EXE

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

Reads user/profile data of web browsers

spyware stealer

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\bbjjgn.exe

Suspicious use of WriteProcessMemory

Description Indicator Process Target
PID 1264 wrote to memory of 1756 N/A C:\Users\Admin\AppData\Local\Temp\8577d33d01e9b4d70ba0abef53c03277.exe C:\Users\Admin\AppData\Local\Temp\bbjjgn.exe
PID 1264 wrote to memory of 1756 N/A C:\Users\Admin\AppData\Local\Temp\8577d33d01e9b4d70ba0abef53c03277.exe C:\Users\Admin\AppData\Local\Temp\bbjjgn.exe
PID 1264 wrote to memory of 1756 N/A C:\Users\Admin\AppData\Local\Temp\8577d33d01e9b4d70ba0abef53c03277.exe C:\Users\Admin\AppData\Local\Temp\bbjjgn.exe
PID 1756 wrote to memory of 988 N/A C:\Users\Admin\AppData\Local\Temp\bbjjgn.exe C:\Users\Admin\AppData\Local\Temp\bbjjgn.exe
PID 1756 wrote to memory of 988 N/A C:\Users\Admin\AppData\Local\Temp\bbjjgn.exe C:\Users\Admin\AppData\Local\Temp\bbjjgn.exe
PID 1756 wrote to memory of 988 N/A C:\Users\Admin\AppData\Local\Temp\bbjjgn.exe C:\Users\Admin\AppData\Local\Temp\bbjjgn.exe
PID 1756 wrote to memory of 988 N/A C:\Users\Admin\AppData\Local\Temp\bbjjgn.exe C:\Users\Admin\AppData\Local\Temp\bbjjgn.exe
PID 1756 wrote to memory of 988 N/A C:\Users\Admin\AppData\Local\Temp\bbjjgn.exe C:\Users\Admin\AppData\Local\Temp\bbjjgn.exe
PID 1756 wrote to memory of 988 N/A C:\Users\Admin\AppData\Local\Temp\bbjjgn.exe C:\Users\Admin\AppData\Local\Temp\bbjjgn.exe
PID 1756 wrote to memory of 988 N/A C:\Users\Admin\AppData\Local\Temp\bbjjgn.exe C:\Users\Admin\AppData\Local\Temp\bbjjgn.exe
PID 1756 wrote to memory of 988 N/A C:\Users\Admin\AppData\Local\Temp\bbjjgn.exe C:\Users\Admin\AppData\Local\Temp\bbjjgn.exe
PID 1756 wrote to memory of 988 N/A C:\Users\Admin\AppData\Local\Temp\bbjjgn.exe C:\Users\Admin\AppData\Local\Temp\bbjjgn.exe

Processes

C:\Users\Admin\AppData\Local\Temp\8577d33d01e9b4d70ba0abef53c03277.exe

"C:\Users\Admin\AppData\Local\Temp\8577d33d01e9b4d70ba0abef53c03277.exe"

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

C:\Users\Admin\AppData\Local\Temp\bbjjgn.exe C:\Users\Admin\AppData\Local\Temp\gqrgzrmb

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

C:\Users\Admin\AppData\Local\Temp\bbjjgn.exe C:\Users\Admin\AppData\Local\Temp\gqrgzrmb

C:\Windows\SysWOW64\WerFault.exe

C:\Windows\SysWOW64\WerFault.exe -pss -s 416 -p 988 -ip 988

C:\Windows\SysWOW64\WerFault.exe

C:\Windows\SysWOW64\WerFault.exe -u -p 988 -s 1352

Network

Country Destination Domain Proto
US 8.8.8.8:53 e4v5sa.xyz udp
US 104.21.20.176:80 e4v5sa.xyz tcp

Files

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

MD5 55c5d5f188d7d14b75e90d81bbedb15b
SHA1 698e0272fe1dc6368a6d50e3ae9d12184098639e
SHA256 74bfefcce9e8c2e34558f25efdaee37e2ba7db59e40965859065a2e408a75770
SHA512 5f105e09abb2c67e5bec9271cb1bd1a96f93b1ccbd420ad987f8d39a2e8c7268e5f8ac7f0ef2630137a82f165231206fcbe21ef6695bc69cb39229de4a5baf08

memory/1756-130-0x0000000000000000-mapping.dmp

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

MD5 55c5d5f188d7d14b75e90d81bbedb15b
SHA1 698e0272fe1dc6368a6d50e3ae9d12184098639e
SHA256 74bfefcce9e8c2e34558f25efdaee37e2ba7db59e40965859065a2e408a75770
SHA512 5f105e09abb2c67e5bec9271cb1bd1a96f93b1ccbd420ad987f8d39a2e8c7268e5f8ac7f0ef2630137a82f165231206fcbe21ef6695bc69cb39229de4a5baf08

C:\Users\Admin\AppData\Local\Temp\gqrgzrmb

MD5 ec86abe57beb8a315221634c1163d772
SHA1 3c1f4ae6ba50b2a900147659669318f65df8b4d8
SHA256 6241a6b459412efd44fe4bca18f57d802dff4682211c15bf970ddb34cfc95e4b
SHA512 444227f8b3db866d057be1c583f8c043a44a2899457ce2c3843a7f69bb318ec0961cb0bc2dfac384bc5631b38422eda5514167fd83b00820d052babff0aa1f85

C:\Users\Admin\AppData\Local\Temp\yqjkc03awp

MD5 d5c7c2dc6891be5104aa4c826890772a
SHA1 21b86d278094e84fce3f455524160f4e81c673fc
SHA256 00b831f5cccded55477fd0fe55d554a7375daae88c815b8cc3ef793f7a4e3ae5
SHA512 afa170c230f718edbd53a9ec9e570c73c28ca4d2f8ded477584262e49fcef3389d1e76bb79fc6bec70fb1f68aa9194c09d35f42dae4e2b2969203fbb251d9f0d

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

MD5 55c5d5f188d7d14b75e90d81bbedb15b
SHA1 698e0272fe1dc6368a6d50e3ae9d12184098639e
SHA256 74bfefcce9e8c2e34558f25efdaee37e2ba7db59e40965859065a2e408a75770
SHA512 5f105e09abb2c67e5bec9271cb1bd1a96f93b1ccbd420ad987f8d39a2e8c7268e5f8ac7f0ef2630137a82f165231206fcbe21ef6695bc69cb39229de4a5baf08

memory/988-135-0x0000000000000000-mapping.dmp

memory/988-137-0x00000000009B0000-0x00000000009E8000-memory.dmp

memory/988-140-0x00000000009B0000-0x00000000009E8000-memory.dmp

memory/988-143-0x00000000009B0000-0x00000000009E8000-memory.dmp