Malware Analysis Report

2024-11-30 15:37

Sample ID 210512-gtj7297qh6
Target 5788658835423232.zip
SHA256 5a651b2be779e145cde1ec5859f66a540c80e06af4504108fb8ed36396e463f9
Tags
phorphiex evasion loader persistence trojan worm
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

5a651b2be779e145cde1ec5859f66a540c80e06af4504108fb8ed36396e463f9

Threat Level: Known bad

The file 5788658835423232.zip was found to be: Known bad.

Malicious Activity Summary

phorphiex evasion loader persistence trojan worm

Modifies Windows Defender Real-time Protection settings

Windows security bypass

Phorphiex Worm

Phorphiex Payload

Executes dropped EXE

Loads dropped DLL

Windows security modification

Adds Run key to start application

Drops file in Program Files directory

Drops file in Windows directory

Program crash

Suspicious use of AdjustPrivilegeToken

Suspicious behavior: EnumeratesProcesses

Suspicious use of WriteProcessMemory

Suspicious behavior: GetForegroundWindowSpam

MITRE ATT&CK

Analysis: static1

Detonation Overview

Reported

2021-05-12 01:22

Signatures

N/A

Analysis: behavioral1

Detonation Overview

Submitted

2021-05-12 01:22

Reported

2021-05-12 01:26

Platform

win7v20210410

Max time kernel

142s

Max time network

125s

Command Line

"C:\Users\Admin\AppData\Local\Temp\25f867b8065165d7876adb29673ac78be2a731ae82b9ea57eb54ba6479bc642e.exe"

Signatures

Modifies Windows Defender Real-time Protection settings

evasion trojan

Phorphiex Payload

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

Phorphiex Worm

worm trojan loader phorphiex

Windows security bypass

evasion trojan

Executes dropped EXE

Description Indicator Process Target
N/A N/A C:\Windows\23068300421408\csrss.exe N/A

Windows security modification

evasion trojan
Description Indicator Process Target
Set value (int) \REGISTRY\MACHINE\SOFTWARE\Wow6432Node\Microsoft\Security Center\AntiVirusOverride = "1" C:\Windows\23068300421408\csrss.exe N/A
Set value (int) \REGISTRY\MACHINE\SOFTWARE\Wow6432Node\Microsoft\Security Center\UpdatesOverride = "1" C:\Windows\23068300421408\csrss.exe N/A
Set value (int) \REGISTRY\MACHINE\SOFTWARE\Wow6432Node\Microsoft\Security Center\FirewallOverride = "1" C:\Windows\23068300421408\csrss.exe N/A
Set value (int) \REGISTRY\MACHINE\SOFTWARE\Wow6432Node\Microsoft\Security Center\AntiVirusDisableNotify = "1" C:\Windows\23068300421408\csrss.exe N/A
Set value (int) \REGISTRY\MACHINE\SOFTWARE\Wow6432Node\Microsoft\Security Center\UpdatesDisableNotify = "1" C:\Windows\23068300421408\csrss.exe N/A
Set value (int) \REGISTRY\MACHINE\SOFTWARE\Wow6432Node\Microsoft\Security Center\AutoUpdateDisableNotify = "1" C:\Windows\23068300421408\csrss.exe N/A
Set value (int) \REGISTRY\MACHINE\SOFTWARE\Wow6432Node\Microsoft\Security Center\FirewallDisableNotify = "1" C:\Windows\23068300421408\csrss.exe N/A

Adds Run key to start application

persistence
Description Indicator Process Target
Set value (str) \REGISTRY\MACHINE\SOFTWARE\Wow6432Node\Microsoft\Windows\CurrentVersion\Run\Client Server Runtime Process = "C:\\Windows\\23068300421408\\csrss.exe" C:\Users\Admin\AppData\Local\Temp\25f867b8065165d7876adb29673ac78be2a731ae82b9ea57eb54ba6479bc642e.exe N/A
Set value (str) \REGISTRY\USER\S-1-5-21-2513283230-931923277-594887482-1000\Software\Microsoft\Windows\CurrentVersion\Run\Client Server Runtime Process = "C:\\Windows\\23068300421408\\csrss.exe" C:\Users\Admin\AppData\Local\Temp\25f867b8065165d7876adb29673ac78be2a731ae82b9ea57eb54ba6479bc642e.exe N/A

Drops file in Program Files directory

Description Indicator Process Target
File opened for modification C:\Program Files\7-Zip\7z.exe C:\Windows\23068300421408\csrss.exe N/A
File opened for modification C:\Program Files\7-Zip\7zfm.exe C:\Windows\23068300421408\csrss.exe N/A
File opened for modification C:\Program Files\7-Zip\7zg.exe C:\Windows\23068300421408\csrss.exe N/A

Drops file in Windows directory

Description Indicator Process Target
File created C:\Windows\23068300421408\csrss.exe C:\Users\Admin\AppData\Local\Temp\25f867b8065165d7876adb29673ac78be2a731ae82b9ea57eb54ba6479bc642e.exe N/A
File opened for modification C:\Windows\23068300421408\csrss.exe C:\Users\Admin\AppData\Local\Temp\25f867b8065165d7876adb29673ac78be2a731ae82b9ea57eb54ba6479bc642e.exe N/A
File opened for modification C:\Windows\23068300421408 C:\Users\Admin\AppData\Local\Temp\25f867b8065165d7876adb29673ac78be2a731ae82b9ea57eb54ba6479bc642e.exe N/A

Program crash

Description Indicator Process Target
N/A N/A C:\Windows\SysWOW64\WerFault.exe C:\Windows\23068300421408\csrss.exe

Suspicious behavior: EnumeratesProcesses

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

Suspicious behavior: GetForegroundWindowSpam

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

Suspicious use of AdjustPrivilegeToken

Description Indicator Process Target
Token: SeDebugPrivilege N/A C:\Windows\SysWOW64\WerFault.exe N/A

Processes

C:\Users\Admin\AppData\Local\Temp\25f867b8065165d7876adb29673ac78be2a731ae82b9ea57eb54ba6479bc642e.exe

"C:\Users\Admin\AppData\Local\Temp\25f867b8065165d7876adb29673ac78be2a731ae82b9ea57eb54ba6479bc642e.exe"

C:\Windows\23068300421408\csrss.exe

C:\Windows\23068300421408\csrss.exe

C:\Windows\SysWOW64\WerFault.exe

C:\Windows\SysWOW64\WerFault.exe -u -p 1196 -s 808

Network

Country Destination Domain Proto
N/A 172.217.20.110:80 tcp
N/A 172.217.20.110:80 tcp
N/A 217.8.117.63:80 tcp
N/A 172.217.20.110:80 tcp
N/A 172.217.20.110:80 tcp

Files

memory/1056-60-0x00000000766D1000-0x00000000766D3000-memory.dmp

memory/1056-61-0x0000000000230000-0x000000000024A000-memory.dmp

memory/1056-62-0x0000000000400000-0x00000000004D2000-memory.dmp

\Windows\23068300421408\csrss.exe

MD5 dd1aa660f2f24368dd58c5ce7a709b6c
SHA1 a54d435a04d3e883b1773d1c8d439dc95628fa07
SHA256 25f867b8065165d7876adb29673ac78be2a731ae82b9ea57eb54ba6479bc642e
SHA512 a86738a5fd7915f3fbd9ddc8b5c3e01a936074749b7e8d14ceb91defef6657b5e5c1fc76fc6461b86424add2099c14b90c88b7b84de53928404562f2148b16b5

memory/1196-64-0x0000000000000000-mapping.dmp

C:\Windows\23068300421408\csrss.exe

MD5 dd1aa660f2f24368dd58c5ce7a709b6c
SHA1 a54d435a04d3e883b1773d1c8d439dc95628fa07
SHA256 25f867b8065165d7876adb29673ac78be2a731ae82b9ea57eb54ba6479bc642e
SHA512 a86738a5fd7915f3fbd9ddc8b5c3e01a936074749b7e8d14ceb91defef6657b5e5c1fc76fc6461b86424add2099c14b90c88b7b84de53928404562f2148b16b5

memory/1196-67-0x0000000000240000-0x000000000025A000-memory.dmp

C:\Windows\23068300421408\csrss.exe

MD5 dd1aa660f2f24368dd58c5ce7a709b6c
SHA1 a54d435a04d3e883b1773d1c8d439dc95628fa07
SHA256 25f867b8065165d7876adb29673ac78be2a731ae82b9ea57eb54ba6479bc642e
SHA512 a86738a5fd7915f3fbd9ddc8b5c3e01a936074749b7e8d14ceb91defef6657b5e5c1fc76fc6461b86424add2099c14b90c88b7b84de53928404562f2148b16b5

memory/796-70-0x0000000000000000-mapping.dmp

\Windows\23068300421408\csrss.exe

MD5 dd1aa660f2f24368dd58c5ce7a709b6c
SHA1 a54d435a04d3e883b1773d1c8d439dc95628fa07
SHA256 25f867b8065165d7876adb29673ac78be2a731ae82b9ea57eb54ba6479bc642e
SHA512 a86738a5fd7915f3fbd9ddc8b5c3e01a936074749b7e8d14ceb91defef6657b5e5c1fc76fc6461b86424add2099c14b90c88b7b84de53928404562f2148b16b5

\Windows\23068300421408\csrss.exe

MD5 dd1aa660f2f24368dd58c5ce7a709b6c
SHA1 a54d435a04d3e883b1773d1c8d439dc95628fa07
SHA256 25f867b8065165d7876adb29673ac78be2a731ae82b9ea57eb54ba6479bc642e
SHA512 a86738a5fd7915f3fbd9ddc8b5c3e01a936074749b7e8d14ceb91defef6657b5e5c1fc76fc6461b86424add2099c14b90c88b7b84de53928404562f2148b16b5

\Windows\23068300421408\csrss.exe

MD5 dd1aa660f2f24368dd58c5ce7a709b6c
SHA1 a54d435a04d3e883b1773d1c8d439dc95628fa07
SHA256 25f867b8065165d7876adb29673ac78be2a731ae82b9ea57eb54ba6479bc642e
SHA512 a86738a5fd7915f3fbd9ddc8b5c3e01a936074749b7e8d14ceb91defef6657b5e5c1fc76fc6461b86424add2099c14b90c88b7b84de53928404562f2148b16b5

memory/796-74-0x00000000007E0000-0x00000000007E1000-memory.dmp

Analysis: behavioral2

Detonation Overview

Submitted

2021-05-12 01:22

Reported

2021-05-12 01:26

Platform

win10v20210410

Max time kernel

117s

Max time network

120s

Command Line

"C:\Users\Admin\AppData\Local\Temp\25f867b8065165d7876adb29673ac78be2a731ae82b9ea57eb54ba6479bc642e.exe"

Signatures

Modifies Windows Defender Real-time Protection settings

evasion trojan

Phorphiex Payload

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

Phorphiex Worm

worm trojan loader phorphiex

Windows security bypass

evasion trojan

Executes dropped EXE

Description Indicator Process Target
N/A N/A C:\Windows\165302927026852\csrss.exe N/A

Windows security modification

evasion trojan
Description Indicator Process Target
Set value (int) \REGISTRY\MACHINE\SOFTWARE\WOW6432Node\Microsoft\Security Center\UpdatesOverride = "1" C:\Windows\165302927026852\csrss.exe N/A
Set value (int) \REGISTRY\MACHINE\SOFTWARE\WOW6432Node\Microsoft\Security Center\FirewallOverride = "1" C:\Windows\165302927026852\csrss.exe N/A
Set value (int) \REGISTRY\MACHINE\SOFTWARE\WOW6432Node\Microsoft\Security Center\AntiVirusDisableNotify = "1" C:\Windows\165302927026852\csrss.exe N/A
Set value (int) \REGISTRY\MACHINE\SOFTWARE\WOW6432Node\Microsoft\Security Center\UpdatesDisableNotify = "1" C:\Windows\165302927026852\csrss.exe N/A
Set value (int) \REGISTRY\MACHINE\SOFTWARE\WOW6432Node\Microsoft\Security Center\AutoUpdateDisableNotify = "1" C:\Windows\165302927026852\csrss.exe N/A
Set value (int) \REGISTRY\MACHINE\SOFTWARE\WOW6432Node\Microsoft\Security Center\FirewallDisableNotify = "1" C:\Windows\165302927026852\csrss.exe N/A
Set value (int) \REGISTRY\MACHINE\SOFTWARE\WOW6432Node\Microsoft\Security Center\AntiVirusOverride = "1" C:\Windows\165302927026852\csrss.exe N/A

Adds Run key to start application

persistence
Description Indicator Process Target
Set value (str) \REGISTRY\MACHINE\SOFTWARE\WOW6432Node\Microsoft\Windows\CurrentVersion\Run\Client Server Runtime Process = "C:\\Windows\\165302927026852\\csrss.exe" C:\Users\Admin\AppData\Local\Temp\25f867b8065165d7876adb29673ac78be2a731ae82b9ea57eb54ba6479bc642e.exe N/A
Set value (str) \REGISTRY\USER\S-1-5-21-3686645723-710336880-414668232-1000\Software\Microsoft\Windows\CurrentVersion\Run\Client Server Runtime Process = "C:\\Windows\\165302927026852\\csrss.exe" C:\Users\Admin\AppData\Local\Temp\25f867b8065165d7876adb29673ac78be2a731ae82b9ea57eb54ba6479bc642e.exe N/A

Drops file in Program Files directory

Description Indicator Process Target
File opened for modification C:\Program Files\7-Zip\7z.exe C:\Windows\165302927026852\csrss.exe N/A
File opened for modification C:\Program Files\7-Zip\7zfm.exe C:\Windows\165302927026852\csrss.exe N/A
File opened for modification C:\Program Files\7-Zip\7zg.exe C:\Windows\165302927026852\csrss.exe N/A

Drops file in Windows directory

Description Indicator Process Target
File opened for modification C:\Windows\165302927026852 C:\Users\Admin\AppData\Local\Temp\25f867b8065165d7876adb29673ac78be2a731ae82b9ea57eb54ba6479bc642e.exe N/A
File created C:\Windows\165302927026852\csrss.exe C:\Users\Admin\AppData\Local\Temp\25f867b8065165d7876adb29673ac78be2a731ae82b9ea57eb54ba6479bc642e.exe N/A
File opened for modification C:\Windows\165302927026852\csrss.exe C:\Users\Admin\AppData\Local\Temp\25f867b8065165d7876adb29673ac78be2a731ae82b9ea57eb54ba6479bc642e.exe N/A

Program crash

Description Indicator Process Target
N/A N/A C:\Windows\SysWOW64\WerFault.exe C:\Windows\165302927026852\csrss.exe

Suspicious use of AdjustPrivilegeToken

Description Indicator Process Target
Token: SeRestorePrivilege N/A C:\Windows\SysWOW64\WerFault.exe N/A
Token: SeBackupPrivilege N/A C:\Windows\SysWOW64\WerFault.exe N/A
Token: SeDebugPrivilege N/A C:\Windows\SysWOW64\WerFault.exe N/A

Processes

C:\Users\Admin\AppData\Local\Temp\25f867b8065165d7876adb29673ac78be2a731ae82b9ea57eb54ba6479bc642e.exe

"C:\Users\Admin\AppData\Local\Temp\25f867b8065165d7876adb29673ac78be2a731ae82b9ea57eb54ba6479bc642e.exe"

C:\Windows\165302927026852\csrss.exe

C:\Windows\165302927026852\csrss.exe

C:\Windows\SysWOW64\WerFault.exe

C:\Windows\SysWOW64\WerFault.exe -u -p 3612 -s 1284

Network

Country Destination Domain Proto
N/A 217.8.117.63:80 tcp

Files

memory/3176-114-0x00000000001E0000-0x00000000001FA000-memory.dmp

memory/3176-115-0x0000000000400000-0x00000000004D2000-memory.dmp

memory/3612-116-0x0000000000000000-mapping.dmp

C:\Windows\165302927026852\csrss.exe

MD5 dd1aa660f2f24368dd58c5ce7a709b6c
SHA1 a54d435a04d3e883b1773d1c8d439dc95628fa07
SHA256 25f867b8065165d7876adb29673ac78be2a731ae82b9ea57eb54ba6479bc642e
SHA512 a86738a5fd7915f3fbd9ddc8b5c3e01a936074749b7e8d14ceb91defef6657b5e5c1fc76fc6461b86424add2099c14b90c88b7b84de53928404562f2148b16b5

C:\Windows\165302927026852\csrss.exe

MD5 dd1aa660f2f24368dd58c5ce7a709b6c
SHA1 a54d435a04d3e883b1773d1c8d439dc95628fa07
SHA256 25f867b8065165d7876adb29673ac78be2a731ae82b9ea57eb54ba6479bc642e
SHA512 a86738a5fd7915f3fbd9ddc8b5c3e01a936074749b7e8d14ceb91defef6657b5e5c1fc76fc6461b86424add2099c14b90c88b7b84de53928404562f2148b16b5

memory/3612-119-0x00000000001D0000-0x00000000001EA000-memory.dmp