remcos | e088712c8943c56456635938bc9668f0ca0724086525de9dc736ae5e77ee17a0

General

Target

1.exe
Size

36KB
MD5

955254331ec1b57550742ed9b353b00f
SHA1

3a00c062489de5371742bc5eca43ae8ec32affac
SHA256

e088712c8943c56456635938bc9668f0ca0724086525de9dc736ae5e77ee17a0
SHA512

5e1aa13cf78fe3d6bfbc15eb2155dad30f0a6e6ea533df7f34ab06eb85ab87fa225c313753fc1886770c9990f2e87400fbfa7bea9a557f9f2acec8d3481b4d70
SSDEEP

768:P5PHyCjmhFdWfLubuZ1kvIaEekM2C8cZNr1:P5PHfjGPAKbLVUer

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:

svshost.exe1.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\""	svshost.exe
Set value (str)	\REGISTRY\MACHINE\SOFTWARE\WOW6432Node\Microsoft\Windows NT\CurrentVersion\Winlogon\Shell = "explorer.exe, \"C:\\Windows\\1877\\svshost.exe\""	1.exe
Set value (str)	\REGISTRY\MACHINE\SOFTWARE\WOW6432Node\Microsoft\Windows NT\CurrentVersion\Winlogon\Userinit = "C:\\WINDOWS\\system32\\userinit.exe, \"C:\\Windows\\1877\\svshost.exe\""	1.exe
Set value (str)	\REGISTRY\MACHINE\SOFTWARE\WOW6432Node\Microsoft\Windows NT\CurrentVersion\Winlogon\Shell = "explorer.exe, \"C:\\Windows\\1877\\svshost.exe\""	svshost.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:

1.exesvshost.exe

description ioc process

Key opened \REGISTRY\MACHINE\HARDWARE\ACPI\DSDT\VBOX__ 1.exe
Key opened \REGISTRY\MACHINE\HARDWARE\ACPI\DSDT\VBOX__ svshost.exe

description	ioc	process
Key opened	\REGISTRY\MACHINE\HARDWARE\ACPI\DSDT\VBOX__	1.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:

1.exesvshost.exe

description	ioc	process
Key created	\REGISTRY\MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Policies\Explorer\Run	1.exe
Set value (str)	\REGISTRY\MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Policies\Explorer\Run\Google Update = "\"C:\\Windows\\1877\\svshost.exe\""	1.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:

1.exe

description ioc process

Key value queried \REGISTRY\USER\S-1-5-21-929662420-1054238289-2961194603-1000\Control Panel\International\Geo\Nation 1.exe
Executes dropped EXE 1 IoCs

Processes:

svshost.exe

pid process

1444 svshost.exe

description	ioc	process
Key value queried	\REGISTRY\USER\S-1-5-21-929662420-1054238289-2961194603-1000\Control Panel\International\Geo\Nation	1.exe

pid	process
1444	svshost.exe

UPX packed file 5 IoCs

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

upx

Processes:

resource	yara_rule
behavioral1/memory/5056-132-0x0000000000400000-0x000000000041D000-memory.dmp	upx
behavioral1/memory/5056-134-0x0000000000400000-0x000000000041D000-memory.dmp	upx
C:\Windows\1877\svshost.exe	upx
C:\Windows\1877\svshost.exe	upx
behavioral1/memory/1444-140-0x0000000000400000-0x000000000041D000-memory.dmp	upx

Adds Run key to start application 2 TTPs 8 IoCs

persistence

Registry Run Keys / Startup Folder

T1060

Modify Registry

T1112

Processes:

svshost.exe1.exe

description	ioc	process
Key created	\REGISTRY\USER\S-1-5-21-929662420-1054238289-2961194603-1000\Software\Microsoft\Windows\CurrentVersion\Run\	svshost.exe
Set value (str)	\REGISTRY\USER\S-1-5-21-929662420-1054238289-2961194603-1000\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
Key created	\REGISTRY\USER\S-1-5-21-929662420-1054238289-2961194603-1000\Software\Microsoft\Windows\CurrentVersion\Run\	1.exe
Set value (str)	\REGISTRY\USER\S-1-5-21-929662420-1054238289-2961194603-1000\SOFTWARE\Microsoft\Windows\CurrentVersion\Run\Google Update = "\"C:\\Windows\\1877\\svshost.exe\""	1.exe
Key created	\REGISTRY\MACHINE\Software\WOW6432Node\Microsoft\Windows\CurrentVersion\Run\	1.exe
Set value (str)	\REGISTRY\MACHINE\SOFTWARE\WOW6432Node\Microsoft\Windows\CurrentVersion\Run\Google Update = "\"C:\\Windows\\1877\\svshost.exe\""	1.exe

Modifies WinLogon 2 TTPs 2 IoCs

persistence

Winlogon Helper DLL

T1004

Modify Registry

T1112

Processes:

svshost.exe1.exe

description	ioc	process
Key created	\REGISTRY\MACHINE\Software\WOW6432Node\Microsoft\Windows NT\CurrentVersion\Winlogon\	svshost.exe
Key created	\REGISTRY\MACHINE\Software\WOW6432Node\Microsoft\Windows NT\CurrentVersion\Winlogon\	1.exe

Program crash 1 IoCs

Processes:

WerFault.exe

pid pid_target process target process

2884 2988 WerFault.exe iexplore.exe
Suspicious use of SetThreadContext 1 IoCs

Processes:

svshost.exe

description pid process target process

PID 1444 set thread context of 2988 1444 svshost.exe iexplore.exe

pid	pid_target	process	target process
2884	2988	WerFault.exe	iexplore.exe

description	pid	process	target process
PID 1444 set thread context of 2988	1444	svshost.exe	iexplore.exe

Drops file in Windows directory 3 IoCs

Processes:

1.exe

description	ioc	process
File created	C:\Windows\1877\svshost.exe	1.exe
File opened for modification	C:\Windows\1877\svshost.exe	1.exe
File opened for modification	C:\Windows\1877	1.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

4708 PING.EXE

pid	process
4708	PING.EXE

Suspicious use of WriteProcessMemory 17 IoCs

Processes:

1.execmd.exesvshost.exe

description	pid	process	target process
PID 5056 wrote to memory of 1088	5056	1.exe	cmd.exe
PID 5056 wrote to memory of 1088	5056	1.exe	cmd.exe
PID 5056 wrote to memory of 1088	5056	1.exe	cmd.exe
PID 1088 wrote to memory of 4708	1088	cmd.exe	PING.EXE
PID 1088 wrote to memory of 4708	1088	cmd.exe	PING.EXE
PID 1088 wrote to memory of 4708	1088	cmd.exe	PING.EXE
PID 1088 wrote to memory of 1444	1088	cmd.exe	svshost.exe
PID 1088 wrote to memory of 1444	1088	cmd.exe	svshost.exe
PID 1088 wrote to memory of 1444	1088	cmd.exe	svshost.exe
PID 1444 wrote to memory of 2988	1444	svshost.exe	iexplore.exe
PID 1444 wrote to memory of 2988	1444	svshost.exe	iexplore.exe
PID 1444 wrote to memory of 2988	1444	svshost.exe	iexplore.exe
PID 1444 wrote to memory of 2988	1444	svshost.exe	iexplore.exe
PID 1444 wrote to memory of 2988	1444	svshost.exe	iexplore.exe
PID 1444 wrote to memory of 2988	1444	svshost.exe	iexplore.exe
PID 1444 wrote to memory of 2988	1444	svshost.exe	iexplore.exe
PID 1444 wrote to memory of 2988	1444	svshost.exe	iexplore.exe

C:\Users\Admin\AppData\Local\Temp\1.exe
"C:\Users\Admin\AppData\Local\Temp\1.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:5056

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:1088

C:\Windows\SysWOW64\PING.EXE
PING 127.0.0.1 -n 2
3⤵
- Runs ping.exe
PID:4708

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 SetThreadContext
- Suspicious use of WriteProcessMemory
PID:1444

C:\Program Files (x86)\Internet Explorer\iexplore.exe
"C:\Program Files (x86)\Internet Explorer\iexplore.exe"
4⤵
PID:2988

C:\Windows\SysWOW64\WerFault.exe
C:\Windows\SysWOW64\WerFault.exe -u -p 2988 -s 236
5⤵
- Program crash
PID:2884

C:\Windows\SysWOW64\WerFault.exe
C:\Windows\SysWOW64\WerFault.exe -pss -s 436 -p 2988 -ip 2988
1⤵
PID:3276

Network

MITRE ATT&CK Matrix ATT&CK v6

Initial Access

Execution

Persistence

Winlogon Helper DLL

2

T1004

Registry Run Keys / Startup Folder

2

T1060

Privilege Escalation

Defense Evasion

Modify Registry

4

T1112

Virtualization/Sandbox Evasion

1

T1497

Credential Access

Discovery

Query Registry

2

T1012

Virtualization/Sandbox Evasion

1

T1497

System Information Discovery

2

T1082

Remote System Discovery

1

T1018

Lateral Movement

Collection

Exfiltration

Command and Control

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
955254331ec1b57550742ed9b353b00f

SHA1
3a00c062489de5371742bc5eca43ae8ec32affac

SHA256
e088712c8943c56456635938bc9668f0ca0724086525de9dc736ae5e77ee17a0

SHA512
5e1aa13cf78fe3d6bfbc15eb2155dad30f0a6e6ea533df7f34ab06eb85ab87fa225c313753fc1886770c9990f2e87400fbfa7bea9a557f9f2acec8d3481b4d70

Download Submit
C:\Windows\1877\svshost.exe
Filesize
36KB

MD5
955254331ec1b57550742ed9b353b00f

SHA1
3a00c062489de5371742bc5eca43ae8ec32affac

SHA256
e088712c8943c56456635938bc9668f0ca0724086525de9dc736ae5e77ee17a0

SHA512
5e1aa13cf78fe3d6bfbc15eb2155dad30f0a6e6ea533df7f34ab06eb85ab87fa225c313753fc1886770c9990f2e87400fbfa7bea9a557f9f2acec8d3481b4d70

Download Submit
memory/1088-133-0x0000000000000000-mapping.dmp

Download
memory/1444-137-0x0000000000000000-mapping.dmp

Download
memory/1444-140-0x0000000000400000-0x000000000041D000-memory.dmp

Filesize
116KB

Download
memory/4708-136-0x0000000000000000-mapping.dmp

Download
memory/5056-132-0x0000000000400000-0x000000000041D000-memory.dmp

Filesize
116KB

Download
memory/5056-134-0x0000000000400000-0x000000000041D000-memory.dmp

Filesize
116KB

Download

Analysis

Sharing

General

Malware Config

Extracted

Signatures

Processes

Network

MITRE ATT&CK Matrix ATT&CK v6

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Downloads