Malware Analysis Report

2024-10-23 20:59

Sample ID 240902-npa21szflb
Target c7501c5118971f1ee4e86372b8963310N.exe
SHA256 a49043714c414f0680f9ee25dd807f73549ae2385a60604d9bc8b59fe19e4ce6
Tags
expiro backdoor discovery persistence
score
10/10

Table of Contents

Analysis Overview

MITRE ATT&CK

Enterprise Matrix V15

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

a49043714c414f0680f9ee25dd807f73549ae2385a60604d9bc8b59fe19e4ce6

Threat Level: Known bad

The file c7501c5118971f1ee4e86372b8963310N.exe was found to be: Known bad.

Malicious Activity Summary

expiro backdoor discovery persistence

Expiro, m0yv

Expiro payload

Loads dropped DLL

Executes dropped EXE

Enumerates connected drives

Modifies WinLogon

Adds Run key to start application

Drops file in System32 directory

Suspicious use of SetThreadContext

System Location Discovery: System Language Discovery

Unsigned PE

Suspicious use of WriteProcessMemory

MITRE ATT&CK

Analysis: static1

Detonation Overview

Reported

2024-09-02 11:33

Signatures

Unsigned PE

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

Analysis: behavioral1

Detonation Overview

Submitted

2024-09-02 11:33

Reported

2024-09-02 11:35

Platform

win7-20240704-en

Max time kernel

114s

Max time network

113s

Command Line

"C:\Users\Admin\AppData\Local\Temp\c7501c5118971f1ee4e86372b8963310N.exe"

Signatures

Expiro, m0yv

backdoor expiro

Expiro payload

backdoor
Description Indicator Process Target
N/A N/A N/A N/A
N/A N/A N/A N/A
N/A N/A N/A N/A
N/A N/A N/A N/A
N/A N/A N/A N/A
N/A N/A N/A N/A
N/A N/A N/A N/A

Executes dropped EXE

Description Indicator Process Target
N/A N/A C:\Windows\SysWOW64\service199.exe N/A
N/A N/A C:\Windows\SysWOW64\service199.exe N/A

Adds Run key to start application

persistence
Description Indicator Process Target
Set value (str) \REGISTRY\USER\S-1-5-21-3294248377-1418901787-4083263181-1000\Software\Microsoft\Windows\CurrentVersion\Run\Adobe Reader Speed Launcher = "C:\\Windows\\SysWOW64\\service199.exe" C:\Windows\SysWOW64\service199.exe N/A
Set value (str) \REGISTRY\MACHINE\SOFTWARE\Wow6432Node\Microsoft\Windows\CurrentVersion\Run\Adobe Reader Speed Launcher = "C:\\Windows\\SysWOW64\\service199.exe" C:\Windows\SysWOW64\service199.exe N/A

Enumerates connected drives

Description Indicator Process Target
File opened (read-only) \??\D: C:\Windows\SysWOW64\service199.exe N/A
File opened (read-only) \??\F: C:\Windows\SysWOW64\service199.exe N/A

Modifies WinLogon

persistence
Description Indicator Process Target
Set value (str) \REGISTRY\MACHINE\SOFTWARE\Wow6432Node\Microsoft\Windows NT\CurrentVersion\Winlogon\Adobe Reader Speed Launcher = "C:\\Windows\\SysWOW64\\service199.exe" C:\Windows\SysWOW64\service199.exe N/A

Drops file in System32 directory

Description Indicator Process Target
File opened for modification C:\Windows\SysWOW64\service199.exe C:\Users\Admin\AppData\Local\Temp\c7501c5118971f1ee4e86372b8963310N.exe N/A
File created C:\Windows\SysWOW64\service199.exe C:\Users\Admin\AppData\Local\Temp\c7501c5118971f1ee4e86372b8963310N.exe N/A

Suspicious use of SetThreadContext

Description Indicator Process Target
PID 3008 set thread context of 2360 N/A C:\Users\Admin\AppData\Local\Temp\c7501c5118971f1ee4e86372b8963310N.exe C:\Users\Admin\AppData\Local\Temp\c7501c5118971f1ee4e86372b8963310N.exe
PID 2816 set thread context of 2808 N/A C:\Windows\SysWOW64\service199.exe C:\Windows\SysWOW64\service199.exe

System Location Discovery: System Language Discovery

discovery
Description Indicator Process Target
Key opened \REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language C:\Users\Admin\AppData\Local\Temp\c7501c5118971f1ee4e86372b8963310N.exe N/A
Key opened \REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language C:\Windows\SysWOW64\service199.exe N/A
Key opened \REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language C:\Windows\SysWOW64\service199.exe N/A
Key opened \REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language C:\Users\Admin\AppData\Local\Temp\c7501c5118971f1ee4e86372b8963310N.exe N/A

Suspicious use of WriteProcessMemory

Description Indicator Process Target
PID 3008 wrote to memory of 2360 N/A C:\Users\Admin\AppData\Local\Temp\c7501c5118971f1ee4e86372b8963310N.exe C:\Users\Admin\AppData\Local\Temp\c7501c5118971f1ee4e86372b8963310N.exe
PID 3008 wrote to memory of 2360 N/A C:\Users\Admin\AppData\Local\Temp\c7501c5118971f1ee4e86372b8963310N.exe C:\Users\Admin\AppData\Local\Temp\c7501c5118971f1ee4e86372b8963310N.exe
PID 3008 wrote to memory of 2360 N/A C:\Users\Admin\AppData\Local\Temp\c7501c5118971f1ee4e86372b8963310N.exe C:\Users\Admin\AppData\Local\Temp\c7501c5118971f1ee4e86372b8963310N.exe
PID 3008 wrote to memory of 2360 N/A C:\Users\Admin\AppData\Local\Temp\c7501c5118971f1ee4e86372b8963310N.exe C:\Users\Admin\AppData\Local\Temp\c7501c5118971f1ee4e86372b8963310N.exe
PID 3008 wrote to memory of 2360 N/A C:\Users\Admin\AppData\Local\Temp\c7501c5118971f1ee4e86372b8963310N.exe C:\Users\Admin\AppData\Local\Temp\c7501c5118971f1ee4e86372b8963310N.exe
PID 3008 wrote to memory of 2360 N/A C:\Users\Admin\AppData\Local\Temp\c7501c5118971f1ee4e86372b8963310N.exe C:\Users\Admin\AppData\Local\Temp\c7501c5118971f1ee4e86372b8963310N.exe
PID 3008 wrote to memory of 2360 N/A C:\Users\Admin\AppData\Local\Temp\c7501c5118971f1ee4e86372b8963310N.exe C:\Users\Admin\AppData\Local\Temp\c7501c5118971f1ee4e86372b8963310N.exe
PID 3008 wrote to memory of 2360 N/A C:\Users\Admin\AppData\Local\Temp\c7501c5118971f1ee4e86372b8963310N.exe C:\Users\Admin\AppData\Local\Temp\c7501c5118971f1ee4e86372b8963310N.exe
PID 2360 wrote to memory of 2816 N/A C:\Users\Admin\AppData\Local\Temp\c7501c5118971f1ee4e86372b8963310N.exe C:\Windows\SysWOW64\service199.exe
PID 2360 wrote to memory of 2816 N/A C:\Users\Admin\AppData\Local\Temp\c7501c5118971f1ee4e86372b8963310N.exe C:\Windows\SysWOW64\service199.exe
PID 2360 wrote to memory of 2816 N/A C:\Users\Admin\AppData\Local\Temp\c7501c5118971f1ee4e86372b8963310N.exe C:\Windows\SysWOW64\service199.exe
PID 2360 wrote to memory of 2816 N/A C:\Users\Admin\AppData\Local\Temp\c7501c5118971f1ee4e86372b8963310N.exe C:\Windows\SysWOW64\service199.exe
PID 2816 wrote to memory of 2808 N/A C:\Windows\SysWOW64\service199.exe C:\Windows\SysWOW64\service199.exe
PID 2816 wrote to memory of 2808 N/A C:\Windows\SysWOW64\service199.exe C:\Windows\SysWOW64\service199.exe
PID 2816 wrote to memory of 2808 N/A C:\Windows\SysWOW64\service199.exe C:\Windows\SysWOW64\service199.exe
PID 2816 wrote to memory of 2808 N/A C:\Windows\SysWOW64\service199.exe C:\Windows\SysWOW64\service199.exe
PID 2816 wrote to memory of 2808 N/A C:\Windows\SysWOW64\service199.exe C:\Windows\SysWOW64\service199.exe
PID 2816 wrote to memory of 2808 N/A C:\Windows\SysWOW64\service199.exe C:\Windows\SysWOW64\service199.exe
PID 2816 wrote to memory of 2808 N/A C:\Windows\SysWOW64\service199.exe C:\Windows\SysWOW64\service199.exe
PID 2816 wrote to memory of 2808 N/A C:\Windows\SysWOW64\service199.exe C:\Windows\SysWOW64\service199.exe

Processes

C:\Users\Admin\AppData\Local\Temp\c7501c5118971f1ee4e86372b8963310N.exe

"C:\Users\Admin\AppData\Local\Temp\c7501c5118971f1ee4e86372b8963310N.exe"

C:\Users\Admin\AppData\Local\Temp\c7501c5118971f1ee4e86372b8963310N.exe

"C:\Users\Admin\AppData\Local\Temp\c7501c5118971f1ee4e86372b8963310N.exe"

C:\Windows\SysWOW64\service199.exe

-n

C:\Windows\SysWOW64\service199.exe

-n

Network

Country Destination Domain Proto
US 8.8.8.8:53 v2z.imageshak.biz udp
DE 178.162.203.226:2040 v2z.imageshak.biz tcp
DE 178.162.203.226:2040 v2z.imageshak.biz tcp
DE 178.162.203.226:2040 v2z.imageshak.biz tcp
DE 178.162.203.226:2040 v2z.imageshak.biz tcp
DE 178.162.203.226:2040 v2z.imageshak.biz tcp
DE 178.162.203.226:2040 v2z.imageshak.biz tcp
US 8.8.8.8:53 v2z.imageshak.biz udp
NL 85.17.31.82:2040 v2z.imageshak.biz tcp
NL 85.17.31.82:2040 v2z.imageshak.biz tcp
NL 85.17.31.82:2040 v2z.imageshak.biz tcp
NL 85.17.31.82:2040 v2z.imageshak.biz tcp
NL 85.17.31.82:2040 v2z.imageshak.biz tcp

Files

memory/3008-0-0x0000000000400000-0x0000000000417000-memory.dmp

memory/2360-1-0x0000000000400000-0x000000000040B000-memory.dmp

memory/3008-3-0x0000000000240000-0x0000000000257000-memory.dmp

memory/2360-4-0x0000000000400000-0x000000000040B000-memory.dmp

memory/3008-11-0x0000000000400000-0x0000000000417000-memory.dmp

memory/2360-10-0x0000000000400000-0x000000000040B000-memory.dmp

memory/2360-8-0x0000000000400000-0x000000000040B000-memory.dmp

memory/2360-6-0x0000000000400000-0x000000000040B000-memory.dmp

memory/2360-13-0x0000000000400000-0x000000000040B000-memory.dmp

memory/2360-14-0x0000000000400000-0x000000000040B000-memory.dmp

\Windows\SysWOW64\service199.exe

MD5 c7501c5118971f1ee4e86372b8963310
SHA1 c7a5bf459c452e0d22ca14b7b3e5696f40fb4b48
SHA256 a49043714c414f0680f9ee25dd807f73549ae2385a60604d9bc8b59fe19e4ce6
SHA512 4b26a3ce4bc4b4e931c2f46a7100aaea3cb3514d043add6fb771c4ef625f65f2b5e03e1b6f3b121f308e0a29ea26197aed2be83414c0a1c07c14e771f87653c9

memory/2816-28-0x0000000000400000-0x0000000000417000-memory.dmp

memory/2360-26-0x0000000000400000-0x000000000040B000-memory.dmp

memory/2816-40-0x0000000000400000-0x0000000000417000-memory.dmp

memory/2808-43-0x0000000000400000-0x000000000040B000-memory.dmp

memory/2808-44-0x0000000000400000-0x000000000040B000-memory.dmp

memory/2808-46-0x0000000000400000-0x000000000040B000-memory.dmp

memory/2808-52-0x0000000000400000-0x000000000040B000-memory.dmp

memory/2808-55-0x0000000000400000-0x000000000040B000-memory.dmp

Analysis: behavioral2

Detonation Overview

Submitted

2024-09-02 11:33

Reported

2024-09-02 11:35

Platform

win10v2004-20240802-en

Max time kernel

115s

Max time network

116s

Command Line

"C:\Users\Admin\AppData\Local\Temp\c7501c5118971f1ee4e86372b8963310N.exe"

Signatures

Expiro, m0yv

backdoor expiro

Expiro payload

backdoor
Description Indicator Process Target
N/A N/A N/A N/A
N/A N/A N/A N/A
N/A N/A N/A N/A
N/A N/A N/A N/A
N/A N/A N/A N/A
N/A N/A N/A N/A
N/A N/A N/A N/A

Executes dropped EXE

Description Indicator Process Target
N/A N/A C:\Windows\SysWOW64\service187.exe N/A
N/A N/A C:\Windows\SysWOW64\service187.exe N/A

Adds Run key to start application

persistence
Description Indicator Process Target
Set value (str) \REGISTRY\USER\S-1-5-21-523280732-2327480845-3730041215-1000\SOFTWARE\Microsoft\Windows\CurrentVersion\Run\Adobe Reader Speed Launcher = "C:\\Windows\\SysWOW64\\service187.exe" C:\Windows\SysWOW64\service187.exe N/A
Set value (str) \REGISTRY\MACHINE\SOFTWARE\WOW6432Node\Microsoft\Windows\CurrentVersion\Run\Adobe Reader Speed Launcher = "C:\\Windows\\SysWOW64\\service187.exe" C:\Windows\SysWOW64\service187.exe N/A

Enumerates connected drives

Description Indicator Process Target
File opened (read-only) \??\D: C:\Windows\SysWOW64\service187.exe N/A
File opened (read-only) \??\F: C:\Windows\SysWOW64\service187.exe N/A

Modifies WinLogon

persistence
Description Indicator Process Target
Set value (str) \REGISTRY\MACHINE\SOFTWARE\WOW6432Node\Microsoft\Windows NT\CurrentVersion\Winlogon\Adobe Reader Speed Launcher = "C:\\Windows\\SysWOW64\\service187.exe" C:\Windows\SysWOW64\service187.exe N/A

Drops file in System32 directory

Description Indicator Process Target
File opened for modification C:\Windows\SysWOW64\service187.exe C:\Users\Admin\AppData\Local\Temp\c7501c5118971f1ee4e86372b8963310N.exe N/A
File created C:\Windows\SysWOW64\service187.exe C:\Users\Admin\AppData\Local\Temp\c7501c5118971f1ee4e86372b8963310N.exe N/A

Suspicious use of SetThreadContext

Description Indicator Process Target
PID 4208 set thread context of 1036 N/A C:\Users\Admin\AppData\Local\Temp\c7501c5118971f1ee4e86372b8963310N.exe C:\Users\Admin\AppData\Local\Temp\c7501c5118971f1ee4e86372b8963310N.exe
PID 1956 set thread context of 4824 N/A C:\Windows\SysWOW64\service187.exe C:\Windows\SysWOW64\service187.exe

System Location Discovery: System Language Discovery

discovery
Description Indicator Process Target
Key opened \REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language C:\Users\Admin\AppData\Local\Temp\c7501c5118971f1ee4e86372b8963310N.exe N/A
Key opened \REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language C:\Windows\SysWOW64\service187.exe N/A
Key opened \REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language C:\Windows\SysWOW64\service187.exe N/A
Key opened \REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language C:\Users\Admin\AppData\Local\Temp\c7501c5118971f1ee4e86372b8963310N.exe N/A

Suspicious use of WriteProcessMemory

Description Indicator Process Target
PID 4208 wrote to memory of 1036 N/A C:\Users\Admin\AppData\Local\Temp\c7501c5118971f1ee4e86372b8963310N.exe C:\Users\Admin\AppData\Local\Temp\c7501c5118971f1ee4e86372b8963310N.exe
PID 4208 wrote to memory of 1036 N/A C:\Users\Admin\AppData\Local\Temp\c7501c5118971f1ee4e86372b8963310N.exe C:\Users\Admin\AppData\Local\Temp\c7501c5118971f1ee4e86372b8963310N.exe
PID 4208 wrote to memory of 1036 N/A C:\Users\Admin\AppData\Local\Temp\c7501c5118971f1ee4e86372b8963310N.exe C:\Users\Admin\AppData\Local\Temp\c7501c5118971f1ee4e86372b8963310N.exe
PID 4208 wrote to memory of 1036 N/A C:\Users\Admin\AppData\Local\Temp\c7501c5118971f1ee4e86372b8963310N.exe C:\Users\Admin\AppData\Local\Temp\c7501c5118971f1ee4e86372b8963310N.exe
PID 4208 wrote to memory of 1036 N/A C:\Users\Admin\AppData\Local\Temp\c7501c5118971f1ee4e86372b8963310N.exe C:\Users\Admin\AppData\Local\Temp\c7501c5118971f1ee4e86372b8963310N.exe
PID 4208 wrote to memory of 1036 N/A C:\Users\Admin\AppData\Local\Temp\c7501c5118971f1ee4e86372b8963310N.exe C:\Users\Admin\AppData\Local\Temp\c7501c5118971f1ee4e86372b8963310N.exe
PID 4208 wrote to memory of 1036 N/A C:\Users\Admin\AppData\Local\Temp\c7501c5118971f1ee4e86372b8963310N.exe C:\Users\Admin\AppData\Local\Temp\c7501c5118971f1ee4e86372b8963310N.exe
PID 1036 wrote to memory of 1956 N/A C:\Users\Admin\AppData\Local\Temp\c7501c5118971f1ee4e86372b8963310N.exe C:\Windows\SysWOW64\service187.exe
PID 1036 wrote to memory of 1956 N/A C:\Users\Admin\AppData\Local\Temp\c7501c5118971f1ee4e86372b8963310N.exe C:\Windows\SysWOW64\service187.exe
PID 1036 wrote to memory of 1956 N/A C:\Users\Admin\AppData\Local\Temp\c7501c5118971f1ee4e86372b8963310N.exe C:\Windows\SysWOW64\service187.exe
PID 1956 wrote to memory of 4824 N/A C:\Windows\SysWOW64\service187.exe C:\Windows\SysWOW64\service187.exe
PID 1956 wrote to memory of 4824 N/A C:\Windows\SysWOW64\service187.exe C:\Windows\SysWOW64\service187.exe
PID 1956 wrote to memory of 4824 N/A C:\Windows\SysWOW64\service187.exe C:\Windows\SysWOW64\service187.exe
PID 1956 wrote to memory of 4824 N/A C:\Windows\SysWOW64\service187.exe C:\Windows\SysWOW64\service187.exe
PID 1956 wrote to memory of 4824 N/A C:\Windows\SysWOW64\service187.exe C:\Windows\SysWOW64\service187.exe
PID 1956 wrote to memory of 4824 N/A C:\Windows\SysWOW64\service187.exe C:\Windows\SysWOW64\service187.exe
PID 1956 wrote to memory of 4824 N/A C:\Windows\SysWOW64\service187.exe C:\Windows\SysWOW64\service187.exe

Processes

C:\Users\Admin\AppData\Local\Temp\c7501c5118971f1ee4e86372b8963310N.exe

"C:\Users\Admin\AppData\Local\Temp\c7501c5118971f1ee4e86372b8963310N.exe"

C:\Users\Admin\AppData\Local\Temp\c7501c5118971f1ee4e86372b8963310N.exe

"C:\Users\Admin\AppData\Local\Temp\c7501c5118971f1ee4e86372b8963310N.exe"

C:\Windows\SysWOW64\service187.exe

-n

C:\Windows\SysWOW64\service187.exe

-n

Network

Country Destination Domain Proto
US 8.8.8.8:53 232.168.11.51.in-addr.arpa udp
US 8.8.8.8:53 71.159.190.20.in-addr.arpa udp
US 8.8.8.8:53 v2z.imageshak.biz udp
NL 5.79.71.205:2040 v2z.imageshak.biz tcp
US 8.8.8.8:53 205.71.79.5.in-addr.arpa udp
US 8.8.8.8:53 13.86.106.20.in-addr.arpa udp
US 8.8.8.8:53 86.23.85.13.in-addr.arpa udp
US 8.8.8.8:53 206.23.85.13.in-addr.arpa udp
US 8.8.8.8:53 172.210.232.199.in-addr.arpa udp
US 8.8.8.8:53 v2z.imageshak.biz udp
NL 5.79.71.205:2040 v2z.imageshak.biz tcp
US 8.8.8.8:53 19.229.111.52.in-addr.arpa udp

Files

memory/4208-0-0x0000000000400000-0x0000000000417000-memory.dmp

memory/1036-1-0x0000000000400000-0x000000000040B000-memory.dmp

memory/4208-3-0x0000000000400000-0x0000000000417000-memory.dmp

memory/1036-4-0x0000000000400000-0x000000000040B000-memory.dmp

memory/1036-5-0x0000000000400000-0x000000000040B000-memory.dmp

C:\Windows\SysWOW64\service187.exe

MD5 c7501c5118971f1ee4e86372b8963310
SHA1 c7a5bf459c452e0d22ca14b7b3e5696f40fb4b48
SHA256 a49043714c414f0680f9ee25dd807f73549ae2385a60604d9bc8b59fe19e4ce6
SHA512 4b26a3ce4bc4b4e931c2f46a7100aaea3cb3514d043add6fb771c4ef625f65f2b5e03e1b6f3b121f308e0a29ea26197aed2be83414c0a1c07c14e771f87653c9

memory/1036-9-0x0000000000400000-0x000000000040B000-memory.dmp

memory/1956-17-0x0000000000400000-0x0000000000417000-memory.dmp

memory/4824-18-0x0000000000400000-0x000000000040B000-memory.dmp

memory/4824-19-0x0000000000400000-0x000000000040B000-memory.dmp

memory/4824-20-0x0000000000400000-0x000000000040B000-memory.dmp

memory/4824-22-0x0000000000400000-0x000000000040B000-memory.dmp

memory/4824-28-0x0000000000400000-0x000000000040B000-memory.dmp

memory/4824-29-0x0000000000400000-0x000000000040B000-memory.dmp