remcos | 089fe1a7004a07e2fa5a8e706359b2d8d0b141bbc4719db9bc378e33b0771764

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"	Iserver.exe

Windows security bypass 2 TTPs 1 IoCs

Disable or Modify Tools

Modify Registry

description	ioc	Process
Set value (int)	\REGISTRY\MACHINE\SOFTWARE\Wow6432Node\Microsoft\Security Center\UACDisableNotify = "0"	Iserver.exe

XpertRAT
XpertRAT is a remote access trojan with various capabilities.
rat xpertrat

XpertRAT Core payload 1 IoCs

resource	yara_rule
behavioral1/memory/3036-81-0x0000000000400000-0x0000000000443000-memory.dmp	xpertrat

NirSoft MailPassView 3 IoCs

Password recovery tool for various email clients

resource	yara_rule
behavioral1/memory/2584-60-0x0000000000400000-0x0000000000457000-memory.dmp	MailPassView
behavioral1/memory/2584-64-0x0000000000400000-0x0000000000457000-memory.dmp	MailPassView
behavioral1/memory/2584-104-0x0000000000400000-0x0000000000457000-memory.dmp	MailPassView

NirSoft WebBrowserPassView 2 IoCs

Password recovery tool for various web browsers

resource	yara_rule
behavioral1/memory/2636-63-0x0000000000400000-0x0000000000478000-memory.dmp	WebBrowserPassView
behavioral1/memory/2636-92-0x0000000000400000-0x0000000000478000-memory.dmp	WebBrowserPassView

Nirsoft 7 IoCs

resource	yara_rule
behavioral1/memory/2584-60-0x0000000000400000-0x0000000000457000-memory.dmp	Nirsoft
behavioral1/memory/2636-63-0x0000000000400000-0x0000000000478000-memory.dmp	Nirsoft
behavioral1/memory/2584-64-0x0000000000400000-0x0000000000457000-memory.dmp	Nirsoft
behavioral1/memory/2652-67-0x0000000000400000-0x0000000000424000-memory.dmp	Nirsoft
behavioral1/memory/2652-68-0x0000000000400000-0x0000000000424000-memory.dmp	Nirsoft
behavioral1/memory/2636-92-0x0000000000400000-0x0000000000478000-memory.dmp	Nirsoft
behavioral1/memory/2584-104-0x0000000000400000-0x0000000000457000-memory.dmp	Nirsoft

Adds policy Run key to start application 2 TTPs 2 IoCs

persistence

Registry Run Keys / Startup Folder

Modify Registry

description	ioc	Process
Key created	\REGISTRY\MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Policies\Explorer\run	iexplore.exe
Set value (str)	\REGISTRY\MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Policies\Explorer\run\U1B5S2E0-S6R4-Y4O1-P7F0-W443P1Y6S3M2 = "C:\\Users\\Admin\\AppData\\Roaming\\U1B5S2E0-S6R4-Y4O1-P7F0-W443P1Y6S3M2\\U1B5S2E0-S6R4-Y4O1-P7F0-W443P1Y6S3M2.exe"	iexplore.exe

Executes dropped EXE 1 IoCs

pid	Process
2680	Iserver.exe

Loads dropped DLL 4 IoCs

pid	Process
2068	Caspol.exe
2680	Iserver.exe
2680	Iserver.exe
2680	Iserver.exe

Windows security modification 2 TTPs 1 IoCs

Disable or Modify Tools

Modify Registry

description	ioc	Process
Set value (int)	\REGISTRY\MACHINE\SOFTWARE\Wow6432Node\Microsoft\Security Center\UACDisableNotify = "0"	Iserver.exe

Accesses Microsoft Outlook accounts 1 TTPs 1 IoCs

collection

Email Collection

T1114

description	ioc	Process
Key opened	\REGISTRY\USER\S-1-5-21-2952504676-3105837840-1406404655-1000\Software\Microsoft\Office\Outlook\OMI Account Manager\Accounts	Caspol.exe

Adds Run key to start application 2 TTPs 2 IoCs

persistence

Registry Run Keys / Startup Folder

Modify Registry

description	ioc	Process
Set value (str)	\REGISTRY\USER\S-1-5-21-2952504676-3105837840-1406404655-1000\Software\Microsoft\Windows\CurrentVersion\Run\U1B5S2E0-S6R4-Y4O1-P7F0-W443P1Y6S3M2 = "C:\\Users\\Admin\\AppData\\Roaming\\U1B5S2E0-S6R4-Y4O1-P7F0-W443P1Y6S3M2\\U1B5S2E0-S6R4-Y4O1-P7F0-W443P1Y6S3M2.exe"	iexplore.exe
Set value (str)	\REGISTRY\MACHINE\SOFTWARE\Wow6432Node\Microsoft\Windows\CurrentVersion\Run\U1B5S2E0-S6R4-Y4O1-P7F0-W443P1Y6S3M2 = "C:\\Users\\Admin\\AppData\\Roaming\\U1B5S2E0-S6R4-Y4O1-P7F0-W443P1Y6S3M2\\U1B5S2E0-S6R4-Y4O1-P7F0-W443P1Y6S3M2.exe"	iexplore.exe

Checks whether UAC is enabled 1 TTPs 1 IoCs

System Information Discovery

T1082

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

Suspicious use of SetThreadContext 5 IoCs

description	pid	Process	procid_target
PID 2176 set thread context of 2068	2176	PO 1100620230526.pdf(39kb).exe	29
PID 2068 set thread context of 2636	2068	Caspol.exe	30
PID 2068 set thread context of 2584	2068	Caspol.exe	31
PID 2068 set thread context of 2652	2068	Caspol.exe	32
PID 2680 set thread context of 3036	2680	Iserver.exe	34

Suspicious behavior: EnumeratesProcesses 7 IoCs

pid	Process
2176	PO 1100620230526.pdf(39kb).exe
2636	Caspol.exe
2680	Iserver.exe
2680	Iserver.exe
2636	Caspol.exe
2680	Iserver.exe
2680	Iserver.exe

Suspicious behavior: MapViewOfSection 3 IoCs

pid	Process
2068	Caspol.exe
2068	Caspol.exe
2068	Caspol.exe

Suspicious use of AdjustPrivilegeToken 3 IoCs

description	pid	Process
Token: SeDebugPrivilege	2176	PO 1100620230526.pdf(39kb).exe
Token: SeDebugPrivilege	2652	Caspol.exe
Token: SeDebugPrivilege	3036	iexplore.exe

Suspicious use of SetWindowsHookEx 3 IoCs

pid	Process
2068	Caspol.exe
2680	Iserver.exe
3036	iexplore.exe

Suspicious use of WriteProcessMemory 51 IoCs

description	pid	Process	procid_target
PID 2176 wrote to memory of 1612	2176	PO 1100620230526.pdf(39kb).exe	28
PID 2176 wrote to memory of 1612	2176	PO 1100620230526.pdf(39kb).exe	28
PID 2176 wrote to memory of 1612	2176	PO 1100620230526.pdf(39kb).exe	28
PID 2176 wrote to memory of 1612	2176	PO 1100620230526.pdf(39kb).exe	28
PID 2176 wrote to memory of 2068	2176	PO 1100620230526.pdf(39kb).exe	29
PID 2176 wrote to memory of 2068	2176	PO 1100620230526.pdf(39kb).exe	29
PID 2176 wrote to memory of 2068	2176	PO 1100620230526.pdf(39kb).exe	29
PID 2176 wrote to memory of 2068	2176	PO 1100620230526.pdf(39kb).exe	29
PID 2176 wrote to memory of 2068	2176	PO 1100620230526.pdf(39kb).exe	29
PID 2176 wrote to memory of 2068	2176	PO 1100620230526.pdf(39kb).exe	29
PID 2176 wrote to memory of 2068	2176	PO 1100620230526.pdf(39kb).exe	29
PID 2176 wrote to memory of 2068	2176	PO 1100620230526.pdf(39kb).exe	29
PID 2176 wrote to memory of 2068	2176	PO 1100620230526.pdf(39kb).exe	29
PID 2176 wrote to memory of 2068	2176	PO 1100620230526.pdf(39kb).exe	29
PID 2176 wrote to memory of 2068	2176	PO 1100620230526.pdf(39kb).exe	29
PID 2176 wrote to memory of 2068	2176	PO 1100620230526.pdf(39kb).exe	29
PID 2176 wrote to memory of 2068	2176	PO 1100620230526.pdf(39kb).exe	29
PID 2068 wrote to memory of 2636	2068	Caspol.exe	30
PID 2068 wrote to memory of 2636	2068	Caspol.exe	30
PID 2068 wrote to memory of 2636	2068	Caspol.exe	30
PID 2068 wrote to memory of 2636	2068	Caspol.exe	30
PID 2068 wrote to memory of 2636	2068	Caspol.exe	30
PID 2068 wrote to memory of 2584	2068	Caspol.exe	31
PID 2068 wrote to memory of 2584	2068	Caspol.exe	31
PID 2068 wrote to memory of 2584	2068	Caspol.exe	31
PID 2068 wrote to memory of 2584	2068	Caspol.exe	31
PID 2068 wrote to memory of 2584	2068	Caspol.exe	31
PID 2068 wrote to memory of 2652	2068	Caspol.exe	32
PID 2068 wrote to memory of 2652	2068	Caspol.exe	32
PID 2068 wrote to memory of 2652	2068	Caspol.exe	32
PID 2068 wrote to memory of 2652	2068	Caspol.exe	32
PID 2068 wrote to memory of 2652	2068	Caspol.exe	32
PID 2068 wrote to memory of 2680	2068	Caspol.exe	33
PID 2068 wrote to memory of 2680	2068	Caspol.exe	33
PID 2068 wrote to memory of 2680	2068	Caspol.exe	33
PID 2068 wrote to memory of 2680	2068	Caspol.exe	33
PID 2068 wrote to memory of 2680	2068	Caspol.exe	33
PID 2068 wrote to memory of 2680	2068	Caspol.exe	33
PID 2068 wrote to memory of 2680	2068	Caspol.exe	33
PID 2680 wrote to memory of 3036	2680	Iserver.exe	34
PID 2680 wrote to memory of 3036	2680	Iserver.exe	34
PID 2680 wrote to memory of 3036	2680	Iserver.exe	34
PID 2680 wrote to memory of 3036	2680	Iserver.exe	34
PID 2680 wrote to memory of 3036	2680	Iserver.exe	34
PID 2680 wrote to memory of 3036	2680	Iserver.exe	34
PID 2680 wrote to memory of 3036	2680	Iserver.exe	34
PID 2680 wrote to memory of 3036	2680	Iserver.exe	34
PID 2680 wrote to memory of 3036	2680	Iserver.exe	34
PID 2680 wrote to memory of 3036	2680	Iserver.exe	34
PID 2680 wrote to memory of 3036	2680	Iserver.exe	34
PID 2680 wrote to memory of 3036	2680	Iserver.exe	34

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"	Iserver.exe

C:\Users\Admin\AppData\Local\Temp\PO 1100620230526.pdf(39kb).exe
"C:\Users\Admin\AppData\Local\Temp\PO 1100620230526.pdf(39kb).exe"
1⤵
- Suspicious use of SetThreadContext
- Suspicious behavior: EnumeratesProcesses
- Suspicious use of AdjustPrivilegeToken
- Suspicious use of WriteProcessMemory
PID:2176
- C:\Windows\Microsoft.NET\Framework\v4.0.30319\Caspol.exe
  "C:\Windows\Microsoft.NET\Framework\v4.0.30319\Caspol.exe"
  2⤵
  PID:1612
- C:\Windows\Microsoft.NET\Framework\v4.0.30319\Caspol.exe
  "C:\Windows\Microsoft.NET\Framework\v4.0.30319\Caspol.exe"
  2⤵
  - Loads dropped DLL
  - Suspicious use of SetThreadContext
  - Suspicious behavior: MapViewOfSection
  - Suspicious use of SetWindowsHookEx
  - Suspicious use of WriteProcessMemory
  PID:2068
- - C:\Windows\Microsoft.NET\Framework\v4.0.30319\Caspol.exe
    C:\Windows\Microsoft.NET\Framework\v4.0.30319\Caspol.exe /stext "C:\Users\Admin\AppData\Local\Temp\dqnlnzxqqaewtxvtubagtxofsfiyrl"
    3⤵
    - Suspicious behavior: EnumeratesProcesses
    PID:2636
- - C:\Windows\Microsoft.NET\Framework\v4.0.30319\Caspol.exe
    C:\Windows\Microsoft.NET\Framework\v4.0.30319\Caspol.exe /stext "C:\Users\Admin\AppData\Local\Temp\nksdnrijlixbddjxdmvawkioatrzkwuwrs"
    3⤵
    - Accesses Microsoft Outlook accounts
    PID:2584
- - C:\Windows\Microsoft.NET\Framework\v4.0.30319\Caspol.exe
    C:\Windows\Microsoft.NET\Framework\v4.0.30319\Caspol.exe /stext "C:\Users\Admin\AppData\Local\Temp\ymywok"
    3⤵
    - Suspicious use of AdjustPrivilegeToken
    PID:2652
- - C:\Users\Admin\AppData\Local\Temp\Iserver.exe
    "C:\Users\Admin\AppData\Local\Temp\Iserver.exe"
    3⤵
    - UAC bypass
    - Windows security bypass
    - Executes dropped EXE
    - Loads dropped DLL
    - Windows security modification
    - Checks whether UAC is enabled
    - Suspicious use of SetThreadContext
    - Suspicious behavior: EnumeratesProcesses
    - Suspicious use of SetWindowsHookEx
    - Suspicious use of WriteProcessMemory
    - System policy modification
    PID:2680
  - - C:\Program Files (x86)\Internet Explorer\iexplore.exe
      C:\Users\Admin\AppData\Local\Temp\Iserver.exe
      4⤵
      Adds policy Run key to start application
      Adds Run key to start application
      Suspicious use of AdjustPrivilegeToken
      Suspicious use of SetWindowsHookEx
      PID:3036

Network

MITRE ATT&CK Enterprise v15

Reconnaissance

Resource Development

Initial Access

Execution

Persistence

Boot or Logon Autostart Execution

T1547

Registry Run Keys / Startup Folder

Privilege Escalation

Abuse Elevation Control Mechanism

T1548

Bypass User Account Control

T1548.002

Boot or Logon Autostart Execution

T1547

Registry Run Keys / Startup Folder

Defense Evasion

Abuse Elevation Control Mechanism

T1548

Bypass User Account Control

T1548.002

Impair Defenses

T1562

Disable or Modify Tools

Modify Registry