remcos | 334c23c94f9c6587e2afd0689796daa8791fda9b823b23836893b86f5cce849f

General

Target

tmp.exe
Size

92KB
MD5

99e19c4a4a8a972005902bf6129867e9
SHA1

6f77809c678265c7beaa9bfd7f8eabffc78513e8
SHA256

334c23c94f9c6587e2afd0689796daa8791fda9b823b23836893b86f5cce849f
SHA512

e216d880e785751375a7f3c8d1f532e530e06351f146a5f39cd4de6386993f81a37abe04b4d8c4c4db596e8730e766b994fde05a417085be3afb378c2da2ebf6
SSDEEP

1536:FhhW0YTGZWdVseJxaM9kraLdV2QkQ1TbPX8IHOCkIsI4ESHNTh9E+JP19qkP6:7hzYTGWVvJ8f2v1TbPzuMsIFSHNThy+

Score

10^/10

remcos 1877 evasion persistence rat

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\Shell = "explorer.exe, \"C:\\Windows\\1877\\svshost.exe\""	tmp.exe
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

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-1-5-21-144354903-2550862337-1367551827-1000\Control Panel\International\Geo\Nation tmp.exe
Executes dropped EXE 1 IoCs

Processes:

svshost.exe

pid process

2660 svshost.exe

description	ioc	process
Key value queried	\REGISTRY\USER\S-1-5-21-144354903-2550862337-1367551827-1000\Control Panel\International\Geo\Nation	tmp.exe

pid	process
2660	svshost.exe

Adds Run key to start application 2 TTPs 8 IoCs

persistence

Registry Run Keys / Startup Folder

T1060

Modify Registry

T1112

Processes:

svshost.exetmp.exe

description	ioc	process
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-1-5-21-144354903-2550862337-1367551827-1000\Software\Microsoft\Windows\CurrentVersion\Run\	tmp.exe
Set value (str)	\REGISTRY\USER\S-1-5-21-144354903-2550862337-1367551827-1000\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-1-5-21-144354903-2550862337-1367551827-1000\Software\Microsoft\Windows\CurrentVersion\Run\	svshost.exe
Set value (str)	\REGISTRY\USER\S-1-5-21-144354903-2550862337-1367551827-1000\SOFTWARE\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

3832 PING.EXE
Suspicious use of SetWindowsHookEx 1 IoCs

Processes:

svshost.exe

pid process

2660 svshost.exe

pid	process
3832	PING.EXE

pid	process
2660	svshost.exe

Suspicious use of WriteProcessMemory 9 IoCs

Processes:

tmp.execmd.exe

description	pid	process	target process
PID 2252 wrote to memory of 1452	2252	tmp.exe	cmd.exe
PID 2252 wrote to memory of 1452	2252	tmp.exe	cmd.exe
PID 2252 wrote to memory of 1452	2252	tmp.exe	cmd.exe
PID 1452 wrote to memory of 3832	1452	cmd.exe	PING.EXE
PID 1452 wrote to memory of 3832	1452	cmd.exe	PING.EXE
PID 1452 wrote to memory of 3832	1452	cmd.exe	PING.EXE
PID 1452 wrote to memory of 2660	1452	cmd.exe	svshost.exe
PID 1452 wrote to memory of 2660	1452	cmd.exe	svshost.exe
PID 1452 wrote to memory of 2660	1452	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:2252

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:1452

C:\Windows\SysWOW64\PING.EXE
PING 127.0.0.1 -n 2
3⤵
- Runs ping.exe
PID:3832

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:2660

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
92KB

MD5
99e19c4a4a8a972005902bf6129867e9

SHA1
6f77809c678265c7beaa9bfd7f8eabffc78513e8

SHA256
334c23c94f9c6587e2afd0689796daa8791fda9b823b23836893b86f5cce849f

SHA512
e216d880e785751375a7f3c8d1f532e530e06351f146a5f39cd4de6386993f81a37abe04b4d8c4c4db596e8730e766b994fde05a417085be3afb378c2da2ebf6

Download Submit
C:\Windows\1877\svshost.exe
Filesize
92KB

MD5
99e19c4a4a8a972005902bf6129867e9

SHA1
6f77809c678265c7beaa9bfd7f8eabffc78513e8

SHA256
334c23c94f9c6587e2afd0689796daa8791fda9b823b23836893b86f5cce849f

SHA512
e216d880e785751375a7f3c8d1f532e530e06351f146a5f39cd4de6386993f81a37abe04b4d8c4c4db596e8730e766b994fde05a417085be3afb378c2da2ebf6

Download Submit

Analysis

Sharing

General

Malware Config

Extracted

Signatures

Processes

Network

MITRE ATT&CK Matrix ATT&CK v6

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