Malware Analysis Report

2024-12-07 03:14

Sample ID 241113-2askea1amb
Target d3f3e7bf2f74eee0bab26b57b4086508.uue
SHA256 bf44cea9ad3b2537695ad68051a3d76103f51acac12dae98046bcc67655a8d89
Tags
remcos rojo discovery persistence rat
score
10/10

Table of Contents

Analysis Overview

MITRE ATT&CK

Enterprise Matrix V15

Analysis: static1

Detonation Overview

Signatures

Analysis: behavioral2

Detonation Overview

Command Line

Signatures

Processes

Network

Files

Analysis: behavioral1

Detonation Overview

Command Line

Signatures

Processes

Network

Files

Analysis Overview

score
10/10

SHA256

bf44cea9ad3b2537695ad68051a3d76103f51acac12dae98046bcc67655a8d89

Threat Level: Known bad

The file d3f3e7bf2f74eee0bab26b57b4086508.uue was found to be: Known bad.

Malicious Activity Summary

remcos rojo discovery persistence rat

Remcos family

Remcos

Downloads MZ/PE file

Adds Run key to start application

Suspicious use of SetThreadContext

Drops file in Windows directory

System Location Discovery: System Language Discovery

Unsigned PE

Suspicious use of SetWindowsHookEx

Modifies registry class

Suspicious use of WriteProcessMemory

Suspicious use of AdjustPrivilegeToken

Suspicious behavior: EnumeratesProcesses

MITRE ATT&CK

Analysis: static1

Detonation Overview

Reported

2024-11-13 22:23

Signatures

Unsigned PE

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

Analysis: behavioral2

Detonation Overview

Submitted

2024-11-13 22:23

Reported

2024-11-13 22:26

Platform

win10v2004-20241007-en

Max time kernel

128s

Max time network

154s

Command Line

"C:\Users\Admin\AppData\Local\Temp\Por medio de la presente, se le comunica que, en virtud del proceso No. 2024-52100-63561-56165, ejec.exe"

Signatures

Remcos

rat remcos

Remcos family

remcos

Downloads MZ/PE file

Adds Run key to start application

persistence
Description Indicator Process Target
Set value (str) \REGISTRY\USER\S-1-5-21-4089630652-1596403869-279772308-1000\SOFTWARE\Microsoft\Windows\CurrentVersion\Run\UnuKick = "C:\\Users\\Admin\\Videos\\Kick\\VideoUnu.exe" C:\Users\Admin\AppData\Local\Temp\Por medio de la presente, se le comunica que, en virtud del proceso No. 2024-52100-63561-56165, ejec.exe N/A

Drops file in Windows directory

Description Indicator Process Target
File opened for modification C:\Windows\Microsoft.NET\Framework\v4.0.30319\MSBuild.exe C:\Windows\Microsoft.NET\Framework\v4.0.30319\MSBuild.exe N/A

System Location Discovery: System Language Discovery

discovery
Description Indicator Process Target
Key opened \REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language C:\Windows\Microsoft.NET\Framework\v4.0.30319\MSBuild.exe N/A
Key opened \REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language C:\Windows\SysWOW64\WScript.exe N/A
Key opened \REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language C:\Users\Admin\AppData\Local\Temp\Por medio de la presente, se le comunica que, en virtud del proceso No. 2024-52100-63561-56165, ejec.exe N/A
Key opened \REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language C:\Windows\Microsoft.NET\Framework\v4.0.30319\csc.exe N/A

Modifies registry class

Description Indicator Process Target
Key created \REGISTRY\USER\S-1-5-21-4089630652-1596403869-279772308-1000_Classes\Local Settings C:\Windows\Microsoft.NET\Framework\v4.0.30319\MSBuild.exe N/A

Suspicious behavior: EnumeratesProcesses

Description Indicator Process Target
N/A N/A C:\Windows\Microsoft.NET\Framework\v4.0.30319\csc.exe N/A
N/A N/A C:\Windows\Microsoft.NET\Framework\v4.0.30319\csc.exe N/A

Suspicious use of AdjustPrivilegeToken

Description Indicator Process Target
Token: SeDebugPrivilege N/A C:\Windows\Microsoft.NET\Framework\v4.0.30319\csc.exe N/A

Suspicious use of SetWindowsHookEx

Description Indicator Process Target
N/A N/A C:\Windows\Microsoft.NET\Framework\v4.0.30319\MSBuild.exe N/A

Suspicious use of WriteProcessMemory

Description Indicator Process Target
PID 1788 wrote to memory of 4448 N/A C:\Users\Admin\AppData\Local\Temp\Por medio de la presente, se le comunica que, en virtud del proceso No. 2024-52100-63561-56165, ejec.exe C:\Windows\Microsoft.NET\Framework\v4.0.30319\csc.exe
PID 1788 wrote to memory of 4448 N/A C:\Users\Admin\AppData\Local\Temp\Por medio de la presente, se le comunica que, en virtud del proceso No. 2024-52100-63561-56165, ejec.exe C:\Windows\Microsoft.NET\Framework\v4.0.30319\csc.exe
PID 1788 wrote to memory of 4448 N/A C:\Users\Admin\AppData\Local\Temp\Por medio de la presente, se le comunica que, en virtud del proceso No. 2024-52100-63561-56165, ejec.exe C:\Windows\Microsoft.NET\Framework\v4.0.30319\csc.exe
PID 1788 wrote to memory of 4448 N/A C:\Users\Admin\AppData\Local\Temp\Por medio de la presente, se le comunica que, en virtud del proceso No. 2024-52100-63561-56165, ejec.exe C:\Windows\Microsoft.NET\Framework\v4.0.30319\csc.exe
PID 1788 wrote to memory of 4448 N/A C:\Users\Admin\AppData\Local\Temp\Por medio de la presente, se le comunica que, en virtud del proceso No. 2024-52100-63561-56165, ejec.exe C:\Windows\Microsoft.NET\Framework\v4.0.30319\csc.exe
PID 4448 wrote to memory of 5640 N/A C:\Windows\Microsoft.NET\Framework\v4.0.30319\csc.exe C:\Windows\Microsoft.NET\Framework\v4.0.30319\MSBuild.exe
PID 4448 wrote to memory of 5640 N/A C:\Windows\Microsoft.NET\Framework\v4.0.30319\csc.exe C:\Windows\Microsoft.NET\Framework\v4.0.30319\MSBuild.exe
PID 4448 wrote to memory of 5640 N/A C:\Windows\Microsoft.NET\Framework\v4.0.30319\csc.exe C:\Windows\Microsoft.NET\Framework\v4.0.30319\MSBuild.exe
PID 4448 wrote to memory of 3812 N/A C:\Windows\Microsoft.NET\Framework\v4.0.30319\csc.exe C:\Windows\Microsoft.NET\Framework\v4.0.30319\MSBuild.exe
PID 4448 wrote to memory of 3812 N/A C:\Windows\Microsoft.NET\Framework\v4.0.30319\csc.exe C:\Windows\Microsoft.NET\Framework\v4.0.30319\MSBuild.exe
PID 4448 wrote to memory of 3812 N/A C:\Windows\Microsoft.NET\Framework\v4.0.30319\csc.exe C:\Windows\Microsoft.NET\Framework\v4.0.30319\MSBuild.exe
PID 4448 wrote to memory of 3812 N/A C:\Windows\Microsoft.NET\Framework\v4.0.30319\csc.exe C:\Windows\Microsoft.NET\Framework\v4.0.30319\MSBuild.exe
PID 4448 wrote to memory of 3812 N/A C:\Windows\Microsoft.NET\Framework\v4.0.30319\csc.exe C:\Windows\Microsoft.NET\Framework\v4.0.30319\MSBuild.exe
PID 4448 wrote to memory of 3812 N/A C:\Windows\Microsoft.NET\Framework\v4.0.30319\csc.exe C:\Windows\Microsoft.NET\Framework\v4.0.30319\MSBuild.exe
PID 4448 wrote to memory of 3812 N/A C:\Windows\Microsoft.NET\Framework\v4.0.30319\csc.exe C:\Windows\Microsoft.NET\Framework\v4.0.30319\MSBuild.exe
PID 4448 wrote to memory of 3812 N/A C:\Windows\Microsoft.NET\Framework\v4.0.30319\csc.exe C:\Windows\Microsoft.NET\Framework\v4.0.30319\MSBuild.exe
PID 4448 wrote to memory of 3812 N/A C:\Windows\Microsoft.NET\Framework\v4.0.30319\csc.exe C:\Windows\Microsoft.NET\Framework\v4.0.30319\MSBuild.exe
PID 4448 wrote to memory of 3812 N/A C:\Windows\Microsoft.NET\Framework\v4.0.30319\csc.exe C:\Windows\Microsoft.NET\Framework\v4.0.30319\MSBuild.exe
PID 3812 wrote to memory of 5888 N/A C:\Windows\Microsoft.NET\Framework\v4.0.30319\MSBuild.exe C:\Windows\SysWOW64\WScript.exe
PID 3812 wrote to memory of 5888 N/A C:\Windows\Microsoft.NET\Framework\v4.0.30319\MSBuild.exe C:\Windows\SysWOW64\WScript.exe
PID 3812 wrote to memory of 5888 N/A C:\Windows\Microsoft.NET\Framework\v4.0.30319\MSBuild.exe C:\Windows\SysWOW64\WScript.exe

Processes

C:\Users\Admin\AppData\Local\Temp\Por medio de la presente, se le comunica que, en virtud del proceso No. 2024-52100-63561-56165, ejec.exe

"C:\Users\Admin\AppData\Local\Temp\Por medio de la presente, se le comunica que, en virtud del proceso No. 2024-52100-63561-56165, ejec.exe"

C:\Windows\Microsoft.NET\Framework\v4.0.30319\csc.exe

"C:\Windows\Microsoft.NET\Framework\v4.0.30319\csc.exe"

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

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

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

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

C:\Windows\SysWOW64\WScript.exe

"C:\Windows\System32\WScript.exe" "C:\Users\Admin\AppData\Local\Temp\dgzaswrowflohczggavxhg.vbs"

Network

Country Destination Domain Proto
US 8.8.8.8:53 8.8.8.8.in-addr.arpa udp
US 8.8.8.8:53 154.239.44.20.in-addr.arpa udp
US 8.8.8.8:53 172.210.232.199.in-addr.arpa udp
US 8.8.8.8:53 22.160.190.20.in-addr.arpa udp
US 8.8.8.8:53 95.221.229.192.in-addr.arpa udp
US 8.8.8.8:53 104.219.191.52.in-addr.arpa udp
US 8.8.8.8:53 seguridadcolombia-activa.homepc.it udp
CO 181.141.40.225:30201 seguridadcolombia-activa.homepc.it tcp
US 8.8.8.8:53 contath.org udp
US 8.8.8.8:53 225.40.141.181.in-addr.arpa udp
US 69.49.234.173:443 contath.org tcp
CO 181.141.40.225:30201 seguridadcolombia-activa.homepc.it tcp
US 8.8.8.8:53 nuevodntestchec.addns.org udp
CO 181.141.40.225:3018 nuevodntestchec.addns.org tcp
US 8.8.8.8:53 173.234.49.69.in-addr.arpa udp
US 8.8.8.8:53 geoplugin.net udp
NL 178.237.33.50:80 geoplugin.net tcp
US 8.8.8.8:53 50.33.237.178.in-addr.arpa udp
US 8.8.8.8:53 212.20.149.52.in-addr.arpa udp
US 8.8.8.8:53 206.23.85.13.in-addr.arpa udp
US 8.8.8.8:53 107.12.20.2.in-addr.arpa udp
CO 181.141.40.225:3018 nuevodntestchec.addns.org tcp
CO 181.141.40.225:3018 nuevodntestchec.addns.org tcp
US 8.8.8.8:53 11.227.111.52.in-addr.arpa udp

Files

memory/1788-1-0x0000000000573000-0x000000000058C000-memory.dmp

memory/1788-0-0x0000000000400000-0x0000000000B20000-memory.dmp

memory/1788-3-0x0000000000400000-0x0000000000B20000-memory.dmp

memory/1788-6-0x0000000000400000-0x0000000000B20000-memory.dmp

memory/1788-5-0x0000000000400000-0x0000000000B20000-memory.dmp

memory/1788-9-0x0000000000400000-0x0000000000B20000-memory.dmp

memory/1788-8-0x0000000000400000-0x0000000000B20000-memory.dmp

memory/4448-7-0x00000000010A0000-0x0000000001144000-memory.dmp

memory/1788-4-0x0000000000400000-0x0000000000B20000-memory.dmp

memory/4448-10-0x0000000005780000-0x0000000005854000-memory.dmp

memory/4448-21-0x0000000005780000-0x000000000584F000-memory.dmp

memory/4448-24-0x0000000005780000-0x000000000584F000-memory.dmp

memory/4448-58-0x0000000005780000-0x000000000584F000-memory.dmp

memory/1788-171-0x0000000000AA9000-0x0000000000AB5000-memory.dmp

memory/4448-168-0x0000000073DEE000-0x0000000073DEF000-memory.dmp

memory/4448-66-0x0000000005780000-0x000000000584F000-memory.dmp

memory/4448-64-0x0000000005780000-0x000000000584F000-memory.dmp

memory/4448-254-0x0000000005940000-0x0000000005950000-memory.dmp

memory/4448-62-0x0000000005780000-0x000000000584F000-memory.dmp

memory/4448-60-0x0000000005780000-0x000000000584F000-memory.dmp

memory/4448-56-0x0000000005780000-0x000000000584F000-memory.dmp

memory/4448-55-0x0000000005780000-0x000000000584F000-memory.dmp

memory/4448-52-0x0000000005780000-0x000000000584F000-memory.dmp

memory/4448-50-0x0000000005780000-0x000000000584F000-memory.dmp

memory/4448-48-0x0000000005780000-0x000000000584F000-memory.dmp

memory/4448-46-0x0000000005780000-0x000000000584F000-memory.dmp

memory/4448-44-0x0000000005780000-0x000000000584F000-memory.dmp

memory/4448-42-0x0000000005780000-0x000000000584F000-memory.dmp

memory/4448-40-0x0000000005780000-0x000000000584F000-memory.dmp

memory/4448-36-0x0000000005780000-0x000000000584F000-memory.dmp

memory/4448-34-0x0000000005780000-0x000000000584F000-memory.dmp

memory/4448-32-0x0000000005780000-0x000000000584F000-memory.dmp

memory/4448-30-0x0000000005780000-0x000000000584F000-memory.dmp

memory/4448-28-0x0000000005780000-0x000000000584F000-memory.dmp

memory/4448-26-0x0000000005780000-0x000000000584F000-memory.dmp

memory/4448-22-0x0000000005780000-0x000000000584F000-memory.dmp

memory/4448-18-0x0000000005780000-0x000000000584F000-memory.dmp

memory/4448-16-0x0000000005780000-0x000000000584F000-memory.dmp

memory/4448-14-0x0000000005780000-0x000000000584F000-memory.dmp

memory/4448-11-0x0000000005780000-0x000000000584F000-memory.dmp

memory/4448-38-0x0000000005780000-0x000000000584F000-memory.dmp

memory/4448-12-0x0000000005780000-0x000000000584F000-memory.dmp

memory/1788-3129-0x0000000000573000-0x000000000058C000-memory.dmp

memory/4448-3929-0x0000000005950000-0x00000000059A6000-memory.dmp

memory/4448-3930-0x00000000059B0000-0x00000000059FC000-memory.dmp

memory/4448-3931-0x0000000005A90000-0x0000000005AF6000-memory.dmp

memory/4448-3932-0x0000000073DEE000-0x0000000073DEF000-memory.dmp

memory/4448-3933-0x0000000006130000-0x0000000006184000-memory.dmp

memory/3812-3940-0x0000000000400000-0x000000000047F000-memory.dmp

memory/3812-3952-0x0000000000400000-0x000000000047F000-memory.dmp

C:\ProgramData\data\registros.dat

MD5 1f7eb09e0c6bac0673ebcc3e8a69ca43
SHA1 9bae1f4251cc13e7129501cce58d590dd963ecf5
SHA256 d546db9b1b42fa64cf820ec0ed4abb96e482647edf33a70c94e19c99754040b3
SHA512 0bdd4ab1f8aa7f2de86137f0f480df91cfbe291ee235012e1739d5e546fdd37d2f7628cf6ab3232b5f96cda145f7bdb5e747528b4b5e1e44541e337372fd9f10

memory/3812-3985-0x0000000000400000-0x000000000047F000-memory.dmp

C:\Users\Admin\AppData\Local\Temp\dgzaswrowflohczggavxhg.vbs

MD5 92323d5eafdd057f2602a2a0b5f5230e
SHA1 9498775850b22af3303ce67d042c7cf3925b396b
SHA256 52512978ad3bd19b5bbc6a332b2cc7635947c9f29979f746f406161ffb3ac34a
SHA512 268d4fe79242535278a9ca3396d1e39f9be88285a4ea01304bd39415728e07e5d9b8392a778732ab3b65ab050aa6aa6aadf6f4d1443b39605763fc380637bb5c

Analysis: behavioral1

Detonation Overview

Submitted

2024-11-13 22:23

Reported

2024-11-13 22:26

Platform

win7-20240708-en

Max time kernel

122s

Max time network

124s

Command Line

"C:\Users\Admin\AppData\Local\Temp\Por medio de la presente, se le comunica que, en virtud del proceso No. 2024-52100-63561-56165, ejec.exe"

Signatures

Adds Run key to start application

persistence
Description Indicator Process Target
Set value (str) \REGISTRY\USER\S-1-5-21-3551809350-4263495960-1443967649-1000\Software\Microsoft\Windows\CurrentVersion\Run\UnuKick = "C:\\Users\\Admin\\Videos\\Kick\\VideoUnu.exe" C:\Users\Admin\AppData\Local\Temp\Por medio de la presente, se le comunica que, en virtud del proceso No. 2024-52100-63561-56165, ejec.exe N/A

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\Por medio de la presente, se le comunica que, en virtud del proceso No. 2024-52100-63561-56165, ejec.exe N/A
Key opened \REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language C:\Windows\Microsoft.NET\Framework\v4.0.30319\csc.exe N/A

Suspicious use of AdjustPrivilegeToken

Description Indicator Process Target
Token: SeDebugPrivilege N/A C:\Windows\Microsoft.NET\Framework\v4.0.30319\csc.exe N/A

Processes

C:\Users\Admin\AppData\Local\Temp\Por medio de la presente, se le comunica que, en virtud del proceso No. 2024-52100-63561-56165, ejec.exe

"C:\Users\Admin\AppData\Local\Temp\Por medio de la presente, se le comunica que, en virtud del proceso No. 2024-52100-63561-56165, ejec.exe"

C:\Windows\Microsoft.NET\Framework\v4.0.30319\csc.exe

"C:\Windows\Microsoft.NET\Framework\v4.0.30319\csc.exe"

Network

Country Destination Domain Proto
US 8.8.8.8:53 seguridadcolombia-activa.homepc.it udp
CO 181.141.40.225:30201 seguridadcolombia-activa.homepc.it tcp
US 8.8.8.8:53 contath.org udp
US 69.49.234.173:443 contath.org tcp

Files

memory/1700-1-0x0000000000573000-0x000000000058C000-memory.dmp

memory/1700-0-0x0000000000400000-0x0000000000B20000-memory.dmp

memory/1700-2-0x0000000000400000-0x0000000000B20000-memory.dmp

memory/1700-4-0x0000000000400000-0x0000000000B20000-memory.dmp

memory/1700-5-0x0000000000400000-0x0000000000B20000-memory.dmp

memory/1700-6-0x0000000000400000-0x0000000000B20000-memory.dmp

memory/2536-19-0x00000000745AE000-0x00000000745AF000-memory.dmp

memory/2536-18-0x0000000000350000-0x00000000003F4000-memory.dmp

memory/1700-17-0x0000000000400000-0x0000000000B20000-memory.dmp

memory/2536-14-0x0000000000350000-0x00000000003F4000-memory.dmp

memory/1700-11-0x0000000000400000-0x0000000000B20000-memory.dmp

memory/2536-10-0x0000000000350000-0x00000000003F4000-memory.dmp

memory/2536-9-0x00000000FFFDE000-0x00000000FFFDF000-memory.dmp

memory/2536-7-0x0000000000350000-0x00000000003F4000-memory.dmp

memory/2536-20-0x00000000745A0000-0x0000000074C8E000-memory.dmp

memory/2536-21-0x0000000001120000-0x00000000011F4000-memory.dmp

memory/2536-22-0x0000000001120000-0x00000000011EF000-memory.dmp

memory/2536-25-0x0000000001120000-0x00000000011EF000-memory.dmp

memory/2536-32-0x0000000001120000-0x00000000011EF000-memory.dmp

memory/2536-41-0x0000000001120000-0x00000000011EF000-memory.dmp

memory/2536-59-0x0000000001120000-0x00000000011EF000-memory.dmp

memory/2536-23-0x0000000001120000-0x00000000011EF000-memory.dmp

memory/2536-71-0x0000000001120000-0x00000000011EF000-memory.dmp

memory/2536-69-0x0000000001120000-0x00000000011EF000-memory.dmp

memory/2536-67-0x0000000001120000-0x00000000011EF000-memory.dmp

memory/2536-65-0x0000000001120000-0x00000000011EF000-memory.dmp

memory/2536-63-0x0000000001120000-0x00000000011EF000-memory.dmp

memory/2536-61-0x0000000001120000-0x00000000011EF000-memory.dmp

memory/2536-57-0x0000000001120000-0x00000000011EF000-memory.dmp

memory/2536-55-0x0000000001120000-0x00000000011EF000-memory.dmp

memory/2536-53-0x0000000001120000-0x00000000011EF000-memory.dmp

memory/2536-52-0x0000000001120000-0x00000000011EF000-memory.dmp

memory/2536-49-0x0000000001120000-0x00000000011EF000-memory.dmp

memory/2536-47-0x0000000001120000-0x00000000011EF000-memory.dmp

memory/2536-45-0x0000000001120000-0x00000000011EF000-memory.dmp

memory/2536-43-0x0000000001120000-0x00000000011EF000-memory.dmp

memory/2536-39-0x0000000001120000-0x00000000011EF000-memory.dmp

memory/2536-37-0x0000000001120000-0x00000000011EF000-memory.dmp

memory/2536-35-0x0000000001120000-0x00000000011EF000-memory.dmp

memory/2536-33-0x0000000001120000-0x00000000011EF000-memory.dmp

memory/2536-29-0x0000000001120000-0x00000000011EF000-memory.dmp

memory/2536-27-0x0000000001120000-0x00000000011EF000-memory.dmp

memory/2536-3936-0x0000000000D60000-0x0000000000DB6000-memory.dmp

memory/2536-3937-0x0000000000DC0000-0x0000000000E0C000-memory.dmp

memory/1700-3938-0x0000000000573000-0x000000000058C000-memory.dmp

memory/2536-3939-0x0000000001070000-0x00000000010C4000-memory.dmp

memory/2536-3940-0x00000000745AE000-0x00000000745AF000-memory.dmp

memory/2536-3941-0x00000000745A0000-0x0000000074C8E000-memory.dmp