remcos | 683fa1e449da9b71d0cafefb107efd97f0f8163f844dd837d12c354c2b901b93

General

Target

tmp.exe
Size

36KB
MD5

148264565031a8ebb6887a1395a2247a
SHA1

3e4238c2f8e69b5c692ef034b6ed6d4ec7673919
SHA256

683fa1e449da9b71d0cafefb107efd97f0f8163f844dd837d12c354c2b901b93
SHA512

41c84fbbfecabcae861eb10216b3910d0f5ddf7e62258e164558485bc6fae2df664cf489f8fab672eb752217c9b052e12fb2e9a1bea68530f25512e8f5f690f9
SSDEEP

768:U5PHyCjmhFdWfLubuZ1kvIaEekM2Q0KbzssZr1:U5PHfjGPAKbLV2o3r

Score

10^/10

remcos 1877 evasion persistence rat upx

Malware Config

Extracted

Family

remcos

Version

1.7 Pro

Botnet

1877

C2

hawler.duckdns.org:2404

5.206.227.115:2404

Attributes

audio_folder
audio
audio_path
%AppData%
audio_record_time
5
connect_delay
0
connect_interval
5
copy_file
svshost.exe
copy_folder
1877
delete_file
false
hide_file
true
hide_keylog_file
false
install_flag
true
install_path
%WinDir%
keylog_crypt
false
keylog_file
logs.dat
keylog_flag
false
keylog_folder
1877
keylog_path
%AppData%
mouse_option
true
mutex
1877_spelzoyulk
screenshot_crypt
false
screenshot_flag
false
screenshot_folder
Screens
screenshot_path
%AppData%
screenshot_time
1
startup_value
Google Update
take_screenshot_option
false
take_screenshot_time
5

Signatures

Modifies WinLogon for persistence 2 TTPs 4 IoCs

persistence

Winlogon Helper DLL

T1004

Modify Registry

T1112

Processes:

tmp.exesvshost.exe

description	ioc	process
Set value (str)	\REGISTRY\MACHINE\SOFTWARE\WOW6432Node\Microsoft\Windows NT\CurrentVersion\Winlogon\Userinit = "C:\\WINDOWS\\system32\\userinit.exe, \"C:\\Windows\\1877\\svshost.exe\""	tmp.exe
Set value (str)	\REGISTRY\MACHINE\SOFTWARE\WOW6432Node\Microsoft\Windows NT\CurrentVersion\Winlogon\Shell = "explorer.exe, \"C:\\Windows\\1877\\svshost.exe\""	svshost.exe
Set value (str)	\REGISTRY\MACHINE\SOFTWARE\WOW6432Node\Microsoft\Windows NT\CurrentVersion\Winlogon\Userinit = "C:\\WINDOWS\\system32\\userinit.exe, \"C:\\Windows\\1877\\svshost.exe\""	svshost.exe
Set value (str)	\REGISTRY\MACHINE\SOFTWARE\WOW6432Node\Microsoft\Windows NT\CurrentVersion\Winlogon\Shell = "explorer.exe, \"C:\\Windows\\1877\\svshost.exe\""	tmp.exe

Remcos
Remcos is a closed-source remote control and surveillance software.
rat remcos
Identifies VirtualBox via ACPI registry values (likely anti-VM) 2 TTPs 2 IoCs
evasion

Query Registry
T1012

Virtualization/Sandbox Evasion
T1497

Processes:

tmp.exesvshost.exe

description ioc process

Key opened \REGISTRY\MACHINE\HARDWARE\ACPI\DSDT\VBOX__ tmp.exe
Key opened \REGISTRY\MACHINE\HARDWARE\ACPI\DSDT\VBOX__ svshost.exe

description	ioc	process
Key opened	\REGISTRY\MACHINE\HARDWARE\ACPI\DSDT\VBOX__	tmp.exe
Key opened	\REGISTRY\MACHINE\HARDWARE\ACPI\DSDT\VBOX__	svshost.exe

Adds policy Run key to start application 2 TTPs 4 IoCs

persistence

Registry Run Keys / Startup Folder

T1060

Modify Registry

T1112

Processes:

tmp.exesvshost.exe

description	ioc	process
Key created	\REGISTRY\MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Policies\Explorer\Run	tmp.exe
Set value (str)	\REGISTRY\MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Policies\Explorer\Run\Google Update = "\"C:\\Windows\\1877\\svshost.exe\""	tmp.exe
Key created	\REGISTRY\MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Policies\Explorer\Run	svshost.exe
Set value (str)	\REGISTRY\MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Policies\Explorer\Run\Google Update = "\"C:\\Windows\\1877\\svshost.exe\""	svshost.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

Processes:

tmp.exe

description ioc process

Key value queried \REGISTRY\USER\S-1-5-21-2971393436-602173351-1645505021-1000\Control Panel\International\Geo\Nation tmp.exe
Executes dropped EXE 1 IoCs

Processes:

svshost.exe

pid process

4592 svshost.exe

description	ioc	process
Key value queried	\REGISTRY\USER\S-1-5-21-2971393436-602173351-1645505021-1000\Control Panel\International\Geo\Nation	tmp.exe

pid	process
4592	svshost.exe

UPX packed file 6 IoCs

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

upx

Processes:

resource	yara_rule
behavioral2/memory/2488-132-0x0000000000400000-0x000000000041D000-memory.dmp	upx
behavioral2/memory/2488-134-0x0000000000400000-0x000000000041D000-memory.dmp	upx
C:\Windows\1877\svshost.exe	upx
C:\Windows\1877\svshost.exe	upx
behavioral2/memory/4592-140-0x0000000000400000-0x000000000041D000-memory.dmp	upx
behavioral2/memory/4592-141-0x0000000000400000-0x000000000041D000-memory.dmp	upx

Adds Run key to start application 2 TTPs 8 IoCs

persistence

Registry Run Keys / Startup Folder

T1060

Modify Registry

T1112

Processes:

tmp.exesvshost.exe

description	ioc	process
Key created	\REGISTRY\USER\S-1-5-21-2971393436-602173351-1645505021-1000\Software\Microsoft\Windows\CurrentVersion\Run\	tmp.exe
Set value (str)	\REGISTRY\USER\S-1-5-21-2971393436-602173351-1645505021-1000\SOFTWARE\Microsoft\Windows\CurrentVersion\Run\Google Update = "\"C:\\Windows\\1877\\svshost.exe\""	tmp.exe
Key created	\REGISTRY\MACHINE\Software\WOW6432Node\Microsoft\Windows\CurrentVersion\Run\	tmp.exe
Set value (str)	\REGISTRY\MACHINE\SOFTWARE\WOW6432Node\Microsoft\Windows\CurrentVersion\Run\Google Update = "\"C:\\Windows\\1877\\svshost.exe\""	tmp.exe
Key created	\REGISTRY\USER\S-1-5-21-2971393436-602173351-1645505021-1000\Software\Microsoft\Windows\CurrentVersion\Run\	svshost.exe
Set value (str)	\REGISTRY\USER\S-1-5-21-2971393436-602173351-1645505021-1000\SOFTWARE\Microsoft\Windows\CurrentVersion\Run\Google Update = "\"C:\\Windows\\1877\\svshost.exe\""	svshost.exe
Key created	\REGISTRY\MACHINE\Software\WOW6432Node\Microsoft\Windows\CurrentVersion\Run\	svshost.exe
Set value (str)	\REGISTRY\MACHINE\SOFTWARE\WOW6432Node\Microsoft\Windows\CurrentVersion\Run\Google Update = "\"C:\\Windows\\1877\\svshost.exe\""	svshost.exe

Modifies WinLogon 2 TTPs 2 IoCs

persistence

Winlogon Helper DLL

T1004

Modify Registry

T1112

Processes:

tmp.exesvshost.exe

description	ioc	process
Key created	\REGISTRY\MACHINE\Software\WOW6432Node\Microsoft\Windows NT\CurrentVersion\Winlogon\	tmp.exe
Key created	\REGISTRY\MACHINE\Software\WOW6432Node\Microsoft\Windows NT\CurrentVersion\Winlogon\	svshost.exe

Drops file in Windows directory 3 IoCs

Processes:

tmp.exe

description	ioc	process
File created	C:\Windows\1877\svshost.exe	tmp.exe
File opened for modification	C:\Windows\1877\svshost.exe	tmp.exe
File opened for modification	C:\Windows\1877	tmp.exe

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

System Information Discovery
T1082
Runs ping.exe 1 TTPs 1 IoCs

Remote System Discovery
T1018

Processes:

PING.EXE

pid process

1736 PING.EXE
Suspicious use of SetWindowsHookEx 1 IoCs

Processes:

svshost.exe

pid process

4592 svshost.exe

pid	process
1736	PING.EXE

pid	process
4592	svshost.exe

Suspicious use of WriteProcessMemory 9 IoCs

Processes:

tmp.execmd.exe

description	pid	process	target process
PID 2488 wrote to memory of 2572	2488	tmp.exe	cmd.exe
PID 2488 wrote to memory of 2572	2488	tmp.exe	cmd.exe
PID 2488 wrote to memory of 2572	2488	tmp.exe	cmd.exe
PID 2572 wrote to memory of 1736	2572	cmd.exe	PING.EXE
PID 2572 wrote to memory of 1736	2572	cmd.exe	PING.EXE
PID 2572 wrote to memory of 1736	2572	cmd.exe	PING.EXE
PID 2572 wrote to memory of 4592	2572	cmd.exe	svshost.exe
PID 2572 wrote to memory of 4592	2572	cmd.exe	svshost.exe
PID 2572 wrote to memory of 4592	2572	cmd.exe	svshost.exe

C:\Users\Admin\AppData\Local\Temp\tmp.exe
"C:\Users\Admin\AppData\Local\Temp\tmp.exe"
1⤵
- Modifies WinLogon for persistence
- Identifies VirtualBox via ACPI registry values (likely anti-VM)
- Adds policy Run key to start application
- Checks computer location settings
- Adds Run key to start application
- Modifies WinLogon
- Drops file in Windows directory
- Suspicious use of WriteProcessMemory
PID:2488

C:\Windows\SysWOW64\cmd.exe
C:\Windows\system32\cmd.exe /c ""C:\Users\Admin\AppData\Local\Temp\install.bat" "
2⤵
- Suspicious use of WriteProcessMemory
PID:2572

C:\Windows\SysWOW64\PING.EXE
PING 127.0.0.1 -n 2
3⤵
- Runs ping.exe
PID:1736

C:\Windows\1877\svshost.exe
"C:\Windows\1877\svshost.exe"
3⤵
- Modifies WinLogon for persistence
- Identifies VirtualBox via ACPI registry values (likely anti-VM)
- Adds policy Run key to start application
- Executes dropped EXE
- Adds Run key to start application
- Modifies WinLogon
- Suspicious use of SetWindowsHookEx
PID:4592

Network

MITRE ATT&CK Enterprise v6

Initial Access

Execution

Persistence

Registry Run Keys / Startup Folder

Winlogon Helper DLL

Privilege Escalation

Defense Evasion

Modify Registry

4

T1112

Virtualization/Sandbox Evasion

1

T1497

Credential Access

Discovery

Query Registry

2

T1012

Remote System Discovery

1

T1018

System Information Discovery

2

T1082

Virtualization/Sandbox Evasion

1

T1497

Lateral Movement

Collection

Command and Control

Exfiltration

Impact

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Downloads

C:\Users\Admin\AppData\Local\Temp\install.bat

Filesize
78B

MD5
f35509e5938343750502f45e998f8d0c

SHA1
74efa4a149f83d677bdf347149d33e0c25cb5af0

SHA256
969621479c4bc68f58f32db1d20a5f389200fee6cdf30e73fe70072184f58afb

SHA512
abb32f92b0dc6d76a5dd83a4d9268e321092626a5b810cbb9c96347e1b40d98ccada231b8d6ad5d5252a2e24082c88f184b201c399106248ea3de564b3483091

Download Submit
C:\Windows\1877\svshost.exe

Filesize
36KB

MD5
148264565031a8ebb6887a1395a2247a

SHA1
3e4238c2f8e69b5c692ef034b6ed6d4ec7673919

SHA256
683fa1e449da9b71d0cafefb107efd97f0f8163f844dd837d12c354c2b901b93

SHA512
41c84fbbfecabcae861eb10216b3910d0f5ddf7e62258e164558485bc6fae2df664cf489f8fab672eb752217c9b052e12fb2e9a1bea68530f25512e8f5f690f9

Download Submit
C:\Windows\1877\svshost.exe

Filesize
36KB

MD5
148264565031a8ebb6887a1395a2247a

SHA1
3e4238c2f8e69b5c692ef034b6ed6d4ec7673919

SHA256
683fa1e449da9b71d0cafefb107efd97f0f8163f844dd837d12c354c2b901b93

SHA512
41c84fbbfecabcae861eb10216b3910d0f5ddf7e62258e164558485bc6fae2df664cf489f8fab672eb752217c9b052e12fb2e9a1bea68530f25512e8f5f690f9

Download Submit
memory/1736-136-0x0000000000000000-mapping.dmp

Download
memory/2488-132-0x0000000000400000-0x000000000041D000-memory.dmp

Filesize
116KB

Download
memory/2488-134-0x0000000000400000-0x000000000041D000-memory.dmp

Filesize
116KB

Download
memory/2572-133-0x0000000000000000-mapping.dmp

Download
memory/4592-137-0x0000000000000000-mapping.dmp

Download
memory/4592-140-0x0000000000400000-0x000000000041D000-memory.dmp

Filesize
116KB

Download
memory/4592-141-0x0000000000400000-0x000000000041D000-memory.dmp

Filesize
116KB

Download

Analysis

Sharing

General

Malware Config

Extracted

Signatures

Processes

Network

MITRE ATT&CK Enterprise v6

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Downloads