remcos | e42a2e4a584d4e2206228b4f32c97f97655380d53eb7157df7b9ff53b01ae0db

General

Target

loader.exe
Size

19.9MB
MD5

de056f7f395b63cfc41101107663bcad
SHA1

6e0aab67abf2aa4ccc75aa00b443050b59f207b5
SHA256

e42a2e4a584d4e2206228b4f32c97f97655380d53eb7157df7b9ff53b01ae0db
SHA512

afd6e680b5103ba92ee302b948d16881076e49b5e9f3f2265cb0f2d9510a4c438a386eebca67097019a4dfea0eeb0b62252d49a1d4f005174c7d78e797a3330c
SSDEEP

393216:87uQYxu8HPWE2UDeYBmv6Tk7xsZQLbX8G8gPpbnZ7Z0VVCreXX6iEMAtU3B6E2KX:au9xVvWqmQkagvPVZ7WVVCrSXbp0GB68

Score

10^/10

remcos evasion execution persistence rat themida trojan

Malware Config

Signatures

Remcos
Remcos is a closed-source remote control and surveillance software.
rat remcos
Remcos family
remcos

Identifies VirtualBox via ACPI registry values (likely anti-VM) 2 TTPs 1 IoCs

evasion

Query Registry

T1012

Virtualization/Sandbox Evasion

T1497

description	ioc	Process
Key opened	\REGISTRY\MACHINE\HARDWARE\ACPI\DSDT\VBOX__	loader.exe

Creates new service(s) 2 TTPs
persistence execution

Windows Service
T1543.003

Service Execution
T1569.002

Checks BIOS information in registry 2 TTPs 2 IoCs

BIOS information is often read in order to detect sandboxing environments.

Query Registry

T1012

System Information Discovery

T1082

description	ioc	Process
Key value queried	\REGISTRY\MACHINE\HARDWARE\DESCRIPTION\System\SystemBiosVersion	loader.exe
Key value queried	\REGISTRY\MACHINE\HARDWARE\DESCRIPTION\System\VideoBiosVersion	loader.exe

Themida packer 13 IoCs

Detects Themida, an advanced Windows software protection system.

themida

resource	yara_rule
behavioral2/memory/4868-0-0x00007FF73BD20000-0x00007FF73DF79000-memory.dmp	themida
behavioral2/memory/4868-2-0x00007FF73BD20000-0x00007FF73DF79000-memory.dmp	themida
behavioral2/memory/4868-3-0x00007FF73BD20000-0x00007FF73DF79000-memory.dmp	themida
behavioral2/memory/4868-4-0x00007FF73BD20000-0x00007FF73DF79000-memory.dmp	themida
behavioral2/memory/4868-5-0x00007FF73BD20000-0x00007FF73DF79000-memory.dmp	themida
behavioral2/memory/4868-6-0x00007FF73BD20000-0x00007FF73DF79000-memory.dmp	themida
behavioral2/memory/4868-8-0x00007FF73BD20000-0x00007FF73DF79000-memory.dmp	themida
behavioral2/memory/4868-7-0x00007FF73BD20000-0x00007FF73DF79000-memory.dmp	themida
behavioral2/memory/4868-9-0x00007FF73BD20000-0x00007FF73DF79000-memory.dmp	themida
behavioral2/memory/4868-10-0x00007FF73BD20000-0x00007FF73DF79000-memory.dmp	themida
behavioral2/memory/4868-11-0x00007FF73BD20000-0x00007FF73DF79000-memory.dmp	themida
behavioral2/memory/4868-12-0x00007FF73BD20000-0x00007FF73DF79000-memory.dmp	themida
behavioral2/memory/4868-15-0x00007FF73BD20000-0x00007FF73DF79000-memory.dmp	themida

Checks whether UAC is enabled 1 TTPs 1 IoCs

evasion trojan

System Information Discovery

T1082

description	ioc	Process
Key value queried	\REGISTRY\MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Policies\System\EnableLUA	loader.exe

Drops file in System32 directory 1 IoCs

description	ioc	Process
File created	C:\Windows\System32\WinKEStack.sys	loader.exe

Suspicious use of NtSetInformationThreadHideFromDebugger 1 IoCs

pid	Process
4868	loader.exe

Launches sc.exe 2 IoCs

Sc.exe is a Windows utlilty to control services on the system.

pid	Process
3404	sc.exe
4668	sc.exe

Suspicious behavior: LoadsDriver 1 IoCs

pid	Process
660	Process not Found

Suspicious use of WriteProcessMemory 12 IoCs

description	pid	Process	procid_target
PID 4868 wrote to memory of 4452	4868	loader.exe	98
PID 4868 wrote to memory of 4452	4868	loader.exe	98
PID 4868 wrote to memory of 3704	4868	loader.exe	99
PID 4868 wrote to memory of 3704	4868	loader.exe	99
PID 3704 wrote to memory of 3404	3704	cmd.exe	100
PID 3704 wrote to memory of 3404	3704	cmd.exe	100
PID 4868 wrote to memory of 2124	4868	loader.exe	101
PID 4868 wrote to memory of 2124	4868	loader.exe	101
PID 2124 wrote to memory of 4668	2124	cmd.exe	102
PID 2124 wrote to memory of 4668	2124	cmd.exe	102
PID 4868 wrote to memory of 2672	4868	loader.exe	103
PID 4868 wrote to memory of 2672	4868	loader.exe	103

C:\Users\Admin\AppData\Local\Temp\loader.exe
"C:\Users\Admin\AppData\Local\Temp\loader.exe"
1⤵
- Identifies VirtualBox via ACPI registry values (likely anti-VM)
- Checks BIOS information in registry
- Checks whether UAC is enabled
- Drops file in System32 directory
- Suspicious use of NtSetInformationThreadHideFromDebugger
- Suspicious use of WriteProcessMemory
PID:4868
- C:\Windows\system32\cmd.exe
  C:\Windows\system32\cmd.exe /c cls
  2⤵
  PID:4452
- C:\Windows\system32\cmd.exe
  C:\Windows\system32\cmd.exe /c sc create WinKEStack binpath="C:\Windows\System32\WinKEStack.sys" type="kernel"
  2⤵
  - Suspicious use of WriteProcessMemory
  PID:3704
- - C:\Windows\system32\sc.exe
    sc create WinKEStack binpath="C:\Windows\System32\WinKEStack.sys" type="kernel"
    3⤵
    - Launches sc.exe
    PID:3404
- C:\Windows\system32\cmd.exe
  C:\Windows\system32\cmd.exe /c sc start WinKEStack
  2⤵
  - Suspicious use of WriteProcessMemory
  PID:2124
- - C:\Windows\system32\sc.exe
    sc start WinKEStack
    3⤵
    - Launches sc.exe
    PID:4668
- C:\Windows\system32\cmd.exe
  C:\Windows\system32\cmd.exe /c cls
  2⤵
  PID:2672

Network

MITRE ATT&CK Enterprise v15

Reconnaissance

Resource Development

Initial Access

Execution

System Services

1

T1569

Service Execution

1

T1569.002

Persistence

Create or Modify System Process

1

T1543

Windows Service

1

T1543.003

Privilege Escalation

Create or Modify System Process

1

T1543

Windows Service

1

T1543.003

Defense Evasion

Virtualization/Sandbox Evasion

1

T1497

Credential Access

Discovery

Query Registry

2

T1012

System Information Discovery

2

T1082

Virtualization/Sandbox Evasion

1

T1497

Lateral Movement

Collection

Command and Control

Exfiltration

Impact

Replay Monitor

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Downloads

memory/4868-0-0x00007FF73BD20000-0x00007FF73DF79000-memory.dmp

Filesize
34.3MB

Download
memory/4868-1-0x00007FF9FDE30000-0x00007FF9FDE32000-memory.dmp

Filesize
8KB

Download
memory/4868-2-0x00007FF73BD20000-0x00007FF73DF79000-memory.dmp

Filesize
34.3MB

Download
memory/4868-3-0x00007FF73BD20000-0x00007FF73DF79000-memory.dmp

Filesize
34.3MB

Download
memory/4868-4-0x00007FF73BD20000-0x00007FF73DF79000-memory.dmp

Filesize
34.3MB

Download
memory/4868-5-0x00007FF73BD20000-0x00007FF73DF79000-memory.dmp

Filesize
34.3MB

Download
memory/4868-6-0x00007FF73BD20000-0x00007FF73DF79000-memory.dmp

Filesize
34.3MB

Download
memory/4868-8-0x00007FF73BD20000-0x00007FF73DF79000-memory.dmp

Filesize
34.3MB

Download
memory/4868-7-0x00007FF73BD20000-0x00007FF73DF79000-memory.dmp

Filesize
34.3MB

Download
memory/4868-9-0x00007FF73BD20000-0x00007FF73DF79000-memory.dmp

Filesize
34.3MB

Download
memory/4868-10-0x00007FF73BD20000-0x00007FF73DF79000-memory.dmp

Filesize
34.3MB

Download
memory/4868-11-0x00007FF73BD20000-0x00007FF73DF79000-memory.dmp

Filesize
34.3MB

Download
memory/4868-12-0x00007FF73BD20000-0x00007FF73DF79000-memory.dmp

Filesize
34.3MB

Download
memory/4868-15-0x00007FF73BD20000-0x00007FF73DF79000-memory.dmp

Filesize
34.3MB

Download

Analysis

Sharing

General

Malware Config

Signatures

Processes

Network

MITRE ATT&CK Enterprise v15

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Downloads