remcos | b50c68306788c3880fa6a3903417c7cdebe25d8e7d8891890fc6143dead37be8

General

Target

b50c68306788c3880fa6a3903417c7cdebe25d8e7d8891890fc6143dead37be8.exe
Size

1.0MB
MD5

f74080e99b9f64e404c1db2f246d1ee8
SHA1

4b27d60d7e196c1c4632ac0e045385510f11edc2
SHA256

b50c68306788c3880fa6a3903417c7cdebe25d8e7d8891890fc6143dead37be8
SHA512

f670cb79dd0f0d7488bc778a8f17310a0c002d013529ca63c5bf672a73aebf9c5889d50816b1703294a280c41aa12acebf6299100c7c614cfe65595a17c178c4
SSDEEP

24576:fG6Wnz1p0C9+xk/rsvMXIojT5Ubcq7xLUsZdKaL7IEGJRTCg071K5:u9oCEx8r6MXb5UhxHZdt7cHTDwK5

Score

10^/10

remcos discovery persistence rat upx

Malware Config

Signatures

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

Blocklisted process makes network request 5 IoCs

flow	pid	Process
36	1748	powershell.exe
39	1748	powershell.exe
41	1748	powershell.exe
45	1748	powershell.exe
48	1748	powershell.exe

Loads dropped DLL 1 IoCs

pid	Process
4720	b50c68306788c3880fa6a3903417c7cdebe25d8e7d8891890fc6143dead37be8.exe

Adds Run key to start application 2 TTPs 1 IoCs

persistence

Registry Run Keys / Startup Folder

T1547.001

Modify Registry

T1112

description	ioc	Process
Set value (str)	\REGISTRY\USER\S-1-5-21-4089630652-1596403869-279772308-1000\SOFTWARE\Microsoft\Windows\CurrentVersion\RunOnce\Chenopodium = "C:\\Users\\Admin\\AppData\\Roaming\\Restandardisation\\Moonlet.exe"	powershell.exe

Suspicious use of NtCreateThreadExHideFromDebugger 1 IoCs

pid	Process
1748	powershell.exe

Suspicious use of NtSetInformationThreadHideFromDebugger 2 IoCs

pid	Process
4720	b50c68306788c3880fa6a3903417c7cdebe25d8e7d8891890fc6143dead37be8.exe
1748	powershell.exe

Suspicious use of SetThreadContext 1 IoCs

description	pid	Process	procid_target
PID 4720 set thread context of 1748	4720	b50c68306788c3880fa6a3903417c7cdebe25d8e7d8891890fc6143dead37be8.exe	92

UPX packed file 7 IoCs

Detects executables packed with UPX/modified UPX open source packer.

upx

resource	yara_rule
behavioral2/memory/1748-27-0x0000000000400000-0x00000000005E4000-memory.dmp	upx
behavioral2/memory/1748-35-0x0000000000400000-0x00000000005E4000-memory.dmp	upx
behavioral2/memory/1748-34-0x0000000000400000-0x00000000005E4000-memory.dmp	upx
behavioral2/memory/1748-33-0x0000000000400000-0x00000000005E4000-memory.dmp	upx
behavioral2/memory/1748-45-0x0000000000400000-0x00000000005E4000-memory.dmp	upx
behavioral2/memory/1748-46-0x0000000000400000-0x00000000005E4000-memory.dmp	upx
behavioral2/memory/1748-47-0x0000000000400000-0x00000000005E4000-memory.dmp	upx

Drops file in Windows directory 1 IoCs

description	ioc	Process
File opened for modification	C:\Windows\ekskommunicere\Rachmaninoff.sto	b50c68306788c3880fa6a3903417c7cdebe25d8e7d8891890fc6143dead37be8.exe

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 2 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	b50c68306788c3880fa6a3903417c7cdebe25d8e7d8891890fc6143dead37be8.exe
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	powershell.exe

Suspicious behavior: MapViewOfSection 2 IoCs

pid	Process
4720	b50c68306788c3880fa6a3903417c7cdebe25d8e7d8891890fc6143dead37be8.exe
4720	b50c68306788c3880fa6a3903417c7cdebe25d8e7d8891890fc6143dead37be8.exe

Suspicious use of SetWindowsHookEx 1 IoCs

pid	Process
1748	powershell.exe

Suspicious use of WriteProcessMemory 8 IoCs

description	pid	Process	procid_target
PID 4720 wrote to memory of 4808	4720	b50c68306788c3880fa6a3903417c7cdebe25d8e7d8891890fc6143dead37be8.exe	91
PID 4720 wrote to memory of 4808	4720	b50c68306788c3880fa6a3903417c7cdebe25d8e7d8891890fc6143dead37be8.exe	91
PID 4720 wrote to memory of 4808	4720	b50c68306788c3880fa6a3903417c7cdebe25d8e7d8891890fc6143dead37be8.exe	91
PID 4720 wrote to memory of 1748	4720	b50c68306788c3880fa6a3903417c7cdebe25d8e7d8891890fc6143dead37be8.exe	92
PID 4720 wrote to memory of 1748	4720	b50c68306788c3880fa6a3903417c7cdebe25d8e7d8891890fc6143dead37be8.exe	92
PID 4720 wrote to memory of 1748	4720	b50c68306788c3880fa6a3903417c7cdebe25d8e7d8891890fc6143dead37be8.exe	92
PID 4720 wrote to memory of 1748	4720	b50c68306788c3880fa6a3903417c7cdebe25d8e7d8891890fc6143dead37be8.exe	92
PID 4720 wrote to memory of 1748	4720	b50c68306788c3880fa6a3903417c7cdebe25d8e7d8891890fc6143dead37be8.exe	92

C:\Users\Admin\AppData\Local\Temp\b50c68306788c3880fa6a3903417c7cdebe25d8e7d8891890fc6143dead37be8.exe
"C:\Users\Admin\AppData\Local\Temp\b50c68306788c3880fa6a3903417c7cdebe25d8e7d8891890fc6143dead37be8.exe"
1⤵
- Loads dropped DLL
- Suspicious use of NtSetInformationThreadHideFromDebugger
- Suspicious use of SetThreadContext
- Drops file in Windows directory
- System Location Discovery: System Language Discovery
- Suspicious behavior: MapViewOfSection
- Suspicious use of WriteProcessMemory
PID:4720
- C:\Windows\SysWOW64\WindowsPowerShell\v1.0\powershell.exe
  "C:\Users\Admin\AppData\Local\Temp\b50c68306788c3880fa6a3903417c7cdebe25d8e7d8891890fc6143dead37be8.exe"
  2⤵
  PID:4808
- C:\Windows\SysWOW64\WindowsPowerShell\v1.0\powershell.exe
  "C:\Users\Admin\AppData\Local\Temp\b50c68306788c3880fa6a3903417c7cdebe25d8e7d8891890fc6143dead37be8.exe"
  2⤵
  - Blocklisted process makes network request
  - Adds Run key to start application
  - Suspicious use of NtCreateThreadExHideFromDebugger
  - Suspicious use of NtSetInformationThreadHideFromDebugger
  - System Location Discovery: System Language Discovery
  - Suspicious use of SetWindowsHookEx
  PID:1748

Network

MITRE ATT&CK Enterprise v15

Reconnaissance

Resource Development

Initial Access

Execution

Persistence

Boot or Logon Autostart Execution

1

T1547

Registry Run Keys / Startup Folder

1

T1547.001

Privilege Escalation

Boot or Logon Autostart Execution

1

T1547

Registry Run Keys / Startup Folder

1

T1547.001

Defense Evasion

Modify Registry

1

T1112

Credential Access

Discovery

System Information Discovery

1

T1082

System Location Discovery

1

T1614

System Language Discovery

1

T1614.001

Lateral Movement

Collection

Command and Control

Exfiltration

Impact

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Downloads

C:\Users\Admin\AppData\Local\Temp\nsk927D.tmp\System.dll

Filesize
12KB

MD5
192639861e3dc2dc5c08bb8f8c7260d5

SHA1
58d30e460609e22fa0098bc27d928b689ef9af78

SHA256
23d618a0293c78ce00f7c6e6dd8b8923621da7dd1f63a070163ef4c0ec3033d6

SHA512
6e573d8b2ef6ed719e271fd0b2fd9cd451f61fc9a9459330108d6d7a65a0f64016303318cad787aa1d5334ba670d8f1c7c13074e1be550b4a316963ecc465cdc

Download Submit
memory/1748-32-0x0000000000400000-0x00000000005E4000-memory.dmp

Filesize
1.9MB

Download
memory/1748-39-0x0000000000400000-0x00000000005E4000-memory.dmp

Filesize
1.9MB

Download
memory/1748-34-0x0000000000400000-0x00000000005E4000-memory.dmp

Filesize
1.9MB

Download
memory/1748-35-0x0000000000400000-0x00000000005E4000-memory.dmp

Filesize
1.9MB

Download
memory/1748-15-0x0000000077148000-0x0000000077149000-memory.dmp

Filesize
4KB

Download
memory/1748-16-0x00000000770C1000-0x00000000771E1000-memory.dmp

Filesize
1.1MB

Download
memory/1748-27-0x0000000000400000-0x00000000005E4000-memory.dmp

Filesize
1.9MB

Download
memory/1748-30-0x00000000770C1000-0x00000000771E1000-memory.dmp

Filesize
1.1MB

Download
memory/1748-33-0x0000000000400000-0x00000000005E4000-memory.dmp

Filesize
1.9MB

Download
memory/1748-46-0x0000000000400000-0x00000000005E4000-memory.dmp

Filesize
1.9MB

Download
memory/1748-47-0x0000000000400000-0x00000000005E4000-memory.dmp

Filesize
1.9MB

Download
memory/1748-45-0x0000000000400000-0x00000000005E4000-memory.dmp

Filesize
1.9MB

Download
memory/1748-31-0x0000000000482000-0x0000000000483000-memory.dmp

Filesize
4KB

Download
memory/1748-36-0x0000000000400000-0x00000000005E4000-memory.dmp

Filesize
1.9MB

Download
memory/1748-37-0x0000000000400000-0x00000000005E4000-memory.dmp

Filesize
1.9MB

Download
memory/1748-38-0x0000000000400000-0x00000000005E4000-memory.dmp

Filesize
1.9MB

Download
memory/1748-41-0x0000000000400000-0x00000000005E4000-memory.dmp

Filesize
1.9MB

Download
memory/1748-40-0x00000000770C1000-0x00000000771E1000-memory.dmp

Filesize
1.1MB

Download
memory/4720-12-0x00000000770C1000-0x00000000771E1000-memory.dmp

Filesize
1.1MB

Download
memory/4720-13-0x0000000073F25000-0x0000000073F26000-memory.dmp

Filesize
4KB

Download
memory/4720-11-0x00000000770C1000-0x00000000771E1000-memory.dmp

Filesize
1.1MB

Download
memory/4720-14-0x0000000073F20000-0x0000000073F27000-memory.dmp

Filesize
28KB

Download

Analysis

Sharing

General

Malware Config

Signatures

Processes

Network

MITRE ATT&CK Enterprise v15

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Downloads