remcos | 991d1e29a1575cacedd43b0cc6254e4e8b905302238b354758933343bfac70da

Bypass User Account Control

T1548.002

Disable or Modify Tools

Modify Registry

description	ioc	Process
Set value (int)	\REGISTRY\MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Policies\System\EnableLUA = "0"	RFQ-00000947i_pdf.exe

Windows security bypass 2 TTPs 2 IoCs

Disable or Modify Tools

Modify Registry

description	ioc	Process
Set value (int)	\REGISTRY\MACHINE\SOFTWARE\Microsoft\Windows Defender\Exclusions\Paths\C:\Users\Admin\AppData\Local\Temp\RFQ-00000947i_pdf.exe = "0"	RFQ-00000947i_pdf.exe
Key created	\REGISTRY\MACHINE\SOFTWARE\Microsoft\Windows Defender\Exclusions\Paths	RFQ-00000947i_pdf.exe

Credentials from Password Stores: Credentials from Web Browsers 1 TTPs
Malicious Access or copy of Web Browser Credential store.
credential_access stealer

Credentials from Web Browsers
T1555.003

Detected Nirsoft tools 3 IoCs

Free utilities often used by attackers which can steal passwords, product keys, etc.

resource	yara_rule
behavioral2/memory/3924-38-0x0000000000400000-0x0000000000462000-memory.dmp	Nirsoft
behavioral2/memory/1272-42-0x0000000000400000-0x0000000000424000-memory.dmp	Nirsoft
behavioral2/memory/4104-40-0x0000000000400000-0x0000000000478000-memory.dmp	Nirsoft

NirSoft MailPassView 1 IoCs

Password recovery tool for various email clients

resource	yara_rule
behavioral2/memory/3924-38-0x0000000000400000-0x0000000000462000-memory.dmp	MailPassView

NirSoft WebBrowserPassView 1 IoCs

Password recovery tool for various web browsers

resource	yara_rule
behavioral2/memory/4104-40-0x0000000000400000-0x0000000000478000-memory.dmp	WebBrowserPassView

Command and Scripting Interpreter: PowerShell 1 TTPs 1 IoCs

Run Powershell to modify Windows Defender settings to add exclusions for file extensions, paths, and processes.

execution

PowerShell

T1059.001

pid	Process
4924	powershell.exe

Checks computer location settings 2 TTPs 1 IoCs

Looks up country code configured in the registry, likely geofence.

Query Registry

T1012

System Information Discovery

T1082

description	ioc	Process
Key value queried	\REGISTRY\USER\S-1-5-21-2718105630-359604950-2820636825-1000\Control Panel\International\Geo\Nation	RFQ-00000947i_pdf.exe

Windows security modification 2 TTPs 3 IoCs

Disable or Modify Tools

Modify Registry

description	ioc	Process
Key created	\REGISTRY\MACHINE\SOFTWARE\Microsoft\Windows Defender\Exclusions\Paths	RFQ-00000947i_pdf.exe
Key created	\REGISTRY\MACHINE\SOFTWARE\Microsoft\Windows Defender\Exclusions	RFQ-00000947i_pdf.exe
Set value (int)	\REGISTRY\MACHINE\SOFTWARE\Microsoft\Windows Defender\Exclusions\Paths\C:\Users\Admin\AppData\Local\Temp\RFQ-00000947i_pdf.exe = "0"	RFQ-00000947i_pdf.exe

Accesses Microsoft Outlook accounts 1 TTPs 1 IoCs

collection

Email Collection

T1114

description	ioc	Process
Key opened	\REGISTRY\USER\S-1-5-21-2718105630-359604950-2820636825-1000\Software\Microsoft\Office\Outlook\OMI Account Manager\Accounts	aspnet_wp.exe

Checks whether UAC is enabled 1 TTPs 2 IoCs

System Information Discovery

T1082

description	ioc	Process
Key value queried	\REGISTRY\MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Policies\System\EnableLUA	RFQ-00000947i_pdf.exe
Set value (int)	\REGISTRY\MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Policies\System\EnableLUA = "0"	RFQ-00000947i_pdf.exe

Suspicious use of SetThreadContext 4 IoCs

description	pid	Process	procid_target
PID 1292 set thread context of 4948	1292	RFQ-00000947i_pdf.exe	89
PID 4948 set thread context of 4104	4948	aspnet_wp.exe	99
PID 4948 set thread context of 3924	4948	aspnet_wp.exe	101
PID 4948 set thread context of 1272	4948	aspnet_wp.exe	103

Enumerates physical storage devices 1 TTPs
Attempts to interact with connected storage/optical drive(s).

System Information Discovery
T1082

System Location Discovery: System Language Discovery 1 TTPs 4 IoCs

Attempt gather information about the system language of a victim in order to infer the geographical location of that host.

discovery

System Language Discovery

T1614.001

description	ioc	Process
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	aspnet_wp.exe
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	aspnet_wp.exe
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	aspnet_wp.exe
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	aspnet_wp.exe

Suspicious behavior: EnumeratesProcesses 8 IoCs

pid	Process
4924	powershell.exe
4924	powershell.exe
4104	aspnet_wp.exe
4104	aspnet_wp.exe
1272	aspnet_wp.exe
1272	aspnet_wp.exe
4104	aspnet_wp.exe
4104	aspnet_wp.exe

Suspicious behavior: MapViewOfSection 5 IoCs

pid	Process
4948	aspnet_wp.exe
4948	aspnet_wp.exe
4948	aspnet_wp.exe
4948	aspnet_wp.exe
4948	aspnet_wp.exe

Suspicious use of AdjustPrivilegeToken 2 IoCs

description	pid	Process
Token: SeDebugPrivilege	4924	powershell.exe
Token: SeDebugPrivilege	1272	aspnet_wp.exe

Suspicious use of WriteProcessMemory 32 IoCs

description	pid	Process	procid_target
PID 1292 wrote to memory of 4924	1292	RFQ-00000947i_pdf.exe	88
PID 1292 wrote to memory of 4924	1292	RFQ-00000947i_pdf.exe	88
PID 1292 wrote to memory of 4948	1292	RFQ-00000947i_pdf.exe	89
PID 1292 wrote to memory of 4948	1292	RFQ-00000947i_pdf.exe	89
PID 1292 wrote to memory of 4948	1292	RFQ-00000947i_pdf.exe	89
PID 1292 wrote to memory of 4948	1292	RFQ-00000947i_pdf.exe	89
PID 1292 wrote to memory of 4948	1292	RFQ-00000947i_pdf.exe	89
PID 1292 wrote to memory of 4948	1292	RFQ-00000947i_pdf.exe	89
PID 1292 wrote to memory of 4948	1292	RFQ-00000947i_pdf.exe	89
PID 1292 wrote to memory of 4948	1292	RFQ-00000947i_pdf.exe	89
PID 1292 wrote to memory of 4948	1292	RFQ-00000947i_pdf.exe	89
PID 1292 wrote to memory of 4948	1292	RFQ-00000947i_pdf.exe	89
PID 1292 wrote to memory of 4948	1292	RFQ-00000947i_pdf.exe	89
PID 1292 wrote to memory of 4948	1292	RFQ-00000947i_pdf.exe	89
PID 4948 wrote to memory of 4104	4948	aspnet_wp.exe	99
PID 4948 wrote to memory of 4104	4948	aspnet_wp.exe	99
PID 4948 wrote to memory of 4104	4948	aspnet_wp.exe	99
PID 4948 wrote to memory of 4104	4948	aspnet_wp.exe	99
PID 4948 wrote to memory of 1844	4948	aspnet_wp.exe	100
PID 4948 wrote to memory of 1844	4948	aspnet_wp.exe	100
PID 4948 wrote to memory of 1844	4948	aspnet_wp.exe	100
PID 4948 wrote to memory of 3924	4948	aspnet_wp.exe	101
PID 4948 wrote to memory of 3924	4948	aspnet_wp.exe	101
PID 4948 wrote to memory of 3924	4948	aspnet_wp.exe	101
PID 4948 wrote to memory of 3924	4948	aspnet_wp.exe	101
PID 4948 wrote to memory of 808	4948	aspnet_wp.exe	102
PID 4948 wrote to memory of 808	4948	aspnet_wp.exe	102
PID 4948 wrote to memory of 808	4948	aspnet_wp.exe	102
PID 4948 wrote to memory of 1272	4948	aspnet_wp.exe	103
PID 4948 wrote to memory of 1272	4948	aspnet_wp.exe	103
PID 4948 wrote to memory of 1272	4948	aspnet_wp.exe	103
PID 4948 wrote to memory of 1272	4948	aspnet_wp.exe	103

System policy modification 1 TTPs 1 IoCs

evasion

Modify Registry

description	ioc	Process
Set value (int)	\REGISTRY\MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Policies\System\EnableLUA = "0"	RFQ-00000947i_pdf.exe

C:\Users\Admin\AppData\Local\Temp\RFQ-00000947i_pdf.exe
"C:\Users\Admin\AppData\Local\Temp\RFQ-00000947i_pdf.exe"
1⤵
- UAC bypass
- Windows security bypass
- Checks computer location settings
- Windows security modification
- Checks whether UAC is enabled
- Suspicious use of SetThreadContext
- Suspicious use of WriteProcessMemory
- System policy modification
PID:1292
- C:\Windows\System32\WindowsPowerShell\v1.0\powershell.exe
  "C:\Windows\System32\WindowsPowerShell\v1.0\powershell.exe" Add-MpPreference -ExclusionPath "C:\Users\Admin\AppData\Local\Temp\RFQ-00000947i_pdf.exe" -Force
  2⤵
  - Command and Scripting Interpreter: PowerShell
  - Suspicious behavior: EnumeratesProcesses
  - Suspicious use of AdjustPrivilegeToken
  PID:4924
- C:\Windows\Microsoft.NET\Framework\v4.0.30319\aspnet_wp.exe
  "C:\Windows\Microsoft.NET\Framework\v4.0.30319\aspnet_wp.exe"
  2⤵
  - Suspicious use of SetThreadContext
  - System Location Discovery: System Language Discovery
  - Suspicious behavior: MapViewOfSection
  - Suspicious use of WriteProcessMemory
  PID:4948
- - C:\Windows\Microsoft.NET\Framework\v4.0.30319\aspnet_wp.exe
    C:\Windows\Microsoft.NET\Framework\v4.0.30319\aspnet_wp.exe /stext "C:\Users\Admin\AppData\Local\Temp\wgmtphehrkspkqcwywtckjluze"
    3⤵
    - System Location Discovery: System Language Discovery
    - Suspicious behavior: EnumeratesProcesses
    PID:4104
- - C:\Windows\Microsoft.NET\Framework\v4.0.30319\aspnet_wp.exe
    C:\Windows\Microsoft.NET\Framework\v4.0.30319\aspnet_wp.exe /stext "C:\Users\Admin\AppData\Local\Temp\gjrmpzpjnslumwqihhgwnogdaslxg"
    3⤵
    PID:1844
- - C:\Windows\Microsoft.NET\Framework\v4.0.30319\aspnet_wp.exe
    C:\Windows\Microsoft.NET\Framework\v4.0.30319\aspnet_wp.exe /stext "C:\Users\Admin\AppData\Local\Temp\gjrmpzpjnslumwqihhgwnogdaslxg"
    3⤵
    - Accesses Microsoft Outlook accounts
    - System Location Discovery: System Language Discovery
    PID:3924
- - C:\Windows\Microsoft.NET\Framework\v4.0.30319\aspnet_wp.exe
    C:\Windows\Microsoft.NET\Framework\v4.0.30319\aspnet_wp.exe /stext "C:\Users\Admin\AppData\Local\Temp\jdefqszcbadzxcfmystxybauizdgzqgo"
    3⤵
    PID:808
- - C:\Windows\Microsoft.NET\Framework\v4.0.30319\aspnet_wp.exe
    C:\Windows\Microsoft.NET\Framework\v4.0.30319\aspnet_wp.exe /stext "C:\Users\Admin\AppData\Local\Temp\jdefqszcbadzxcfmystxybauizdgzqgo"
    3⤵
    - System Location Discovery: System Language Discovery
    - Suspicious behavior: EnumeratesProcesses
    - Suspicious use of AdjustPrivilegeToken
    PID:1272

Network

MITRE ATT&CK Enterprise v15

Reconnaissance

Resource Development

Initial Access

Execution

Command and Scripting Interpreter

T1059

PowerShell

T1059.001

Persistence

Privilege Escalation

Abuse Elevation Control Mechanism

T1548

Bypass User Account Control

T1548.002

Defense Evasion

Abuse Elevation Control Mechanism

T1548

Bypass User Account Control

T1548.002

Impair Defenses

T1562

Disable or Modify Tools

Modify Registry