remcos | 2310d8f49412769bbb634a16cb272a77dcde3104405155e811d21a88712e4d13

General

Target

864-80-0x0000000000400000-0x0000000000417000-memory.exe
Size

92KB
MD5

81decf81e0f22a06673849e16ff57b01
SHA1

de0023dc4f84a29cf2ea6238de09ba7f8deaf3cb
SHA256

2310d8f49412769bbb634a16cb272a77dcde3104405155e811d21a88712e4d13
SHA512

a484773eecc880b9975732ae4ba4ea7ca716f2e7f256344df52a09814821a63f56c9e306e248b5dfd6ca1f2b96d0c959efeb3103e397033cd98b7e34eb29bf4c
SSDEEP

1536:4hhW0YTGZWdVseJxaM9kraLdV2QkQ1TbPX8IHOCkIsI4ESHNTh9E+JP19qkP6nrA:ehzYTGWVvJ8f2v1TbPzuMsIFSHNThy+b

Score

10^/10

remcos nov 24th evasion persistence rat trojan

Malware Config

Extracted

Family

remcos

Version

1.7 Pro

Botnet

Nov 24th

C2

gcrozona.duckdns.org:6062

Attributes

audio_folder
audio
audio_path
%AppData%
audio_record_time
5
connect_delay
0
connect_interval
5
copy_file
Microsoft Intel Audios.exe
copy_folder
Audio Microsoft File
delete_file
false
hide_file
true
hide_keylog_file
true
install_flag
true
install_path
%WinDir%
keylog_crypt
true
keylog_file
logs.dat
keylog_flag
false
keylog_folder
Windows Display
keylog_path
%WinDir%
mouse_option
false
mutex
Windows Audio
screenshot_crypt
false
screenshot_flag
false
screenshot_folder
Screens
screenshot_path
%AppData%
screenshot_time
1
startup_value
Window Security Check
take_screenshot_option
true
take_screenshot_time
5
take_screenshot_title
Username;password;proforma;invoice;notepad

Signatures

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

UAC bypass 3 TTPs 3 IoCs

evasion trojan

Bypass User Account Control

T1088

Disabling Security Tools

T1089

Modify Registry

T1112

Processes:

reg.exereg.exereg.exe

description	ioc	process
Set value (int)	\REGISTRY\MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Policies\System\EnableLUA = "0"	reg.exe
Set value (int)	\REGISTRY\MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Policies\System\EnableLUA = "0"	reg.exe
Set value (int)	\REGISTRY\MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Policies\System\EnableLUA = "0"	reg.exe

Executes dropped EXE 1 IoCs

Processes:

Microsoft Intel Audios.exe

pid process

1660 Microsoft Intel Audios.exe

pid	process
1660	Microsoft Intel Audios.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:

864-80-0x0000000000400000-0x0000000000417000-memory.exe

description	ioc	process
Key value queried	\REGISTRY\USER\S-1-5-21-4246620582-653642754-1174164128-1000\Control Panel\International\Geo\Nation	864-80-0x0000000000400000-0x0000000000417000-memory.exe

Adds Run key to start application 2 TTPs 4 IoCs

persistence

Registry Run Keys / Startup Folder

T1060

Modify Registry

T1112

Processes:

864-80-0x0000000000400000-0x0000000000417000-memory.exeMicrosoft Intel Audios.exe

description	ioc	process
Set value (str)	\REGISTRY\USER\S-1-5-21-4246620582-653642754-1174164128-1000\SOFTWARE\Microsoft\Windows\CurrentVersion\Run\Window Security Check = "\"C:\\Windows\\Audio Microsoft File\\Microsoft Intel Audios.exe\""	864-80-0x0000000000400000-0x0000000000417000-memory.exe
Key created	\REGISTRY\USER\S-1-5-21-4246620582-653642754-1174164128-1000\Software\Microsoft\Windows\CurrentVersion\Run\	Microsoft Intel Audios.exe
Set value (str)	\REGISTRY\USER\S-1-5-21-4246620582-653642754-1174164128-1000\SOFTWARE\Microsoft\Windows\CurrentVersion\Run\Window Security Check = "\"C:\\Windows\\Audio Microsoft File\\Microsoft Intel Audios.exe\""	Microsoft Intel Audios.exe
Key created	\REGISTRY\USER\S-1-5-21-4246620582-653642754-1174164128-1000\Software\Microsoft\Windows\CurrentVersion\Run\	864-80-0x0000000000400000-0x0000000000417000-memory.exe

Suspicious use of SetThreadContext 1 IoCs

Processes:

Microsoft Intel Audios.exe

description pid process target process

PID 1660 set thread context of 1140 1660 Microsoft Intel Audios.exe iexplore.exe

description	pid	process	target process
PID 1660 set thread context of 1140	1660	Microsoft Intel Audios.exe	iexplore.exe

Drops file in Windows directory 5 IoCs

Processes:

864-80-0x0000000000400000-0x0000000000417000-memory.exeiexplore.exe

description	ioc	process
File opened for modification	C:\Windows\Audio Microsoft File	864-80-0x0000000000400000-0x0000000000417000-memory.exe
File opened for modification	C:\Windows\Windows Display\logs.dat	iexplore.exe
File created	C:\Windows\Windows Display\logs.dat	iexplore.exe
File created	C:\Windows\Audio Microsoft File\Microsoft Intel Audios.exe	864-80-0x0000000000400000-0x0000000000417000-memory.exe
File opened for modification	C:\Windows\Audio Microsoft File\Microsoft Intel Audios.exe	864-80-0x0000000000400000-0x0000000000417000-memory.exe

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

System Information Discovery
T1082
Modifies registry key 1 TTPs 3 IoCs

Modify Registry
T1112

Processes:

reg.exereg.exereg.exe

pid process

4832 reg.exe
4284 reg.exe
696 reg.exe
Runs ping.exe 1 TTPs 1 IoCs

Remote System Discovery
T1018

Processes:

PING.EXE

pid process

2328 PING.EXE
Suspicious behavior: GetForegroundWindowSpam 1 IoCs

Processes:

iexplore.exe

pid process

1140 iexplore.exe
Suspicious use of SetWindowsHookEx 1 IoCs

Processes:

iexplore.exe

pid process

1140 iexplore.exe

pid	process
4832	reg.exe
4284	reg.exe
696	reg.exe

pid	process
2328	PING.EXE

pid	process
1140	iexplore.exe

pid	process
1140	iexplore.exe

Suspicious use of WriteProcessMemory 36 IoCs

Processes:

864-80-0x0000000000400000-0x0000000000417000-memory.execmd.execmd.exeMicrosoft Intel Audios.execmd.exeiexplore.execmd.exe

description	pid	process	target process
PID 4064 wrote to memory of 3464	4064	864-80-0x0000000000400000-0x0000000000417000-memory.exe	cmd.exe
PID 4064 wrote to memory of 3464	4064	864-80-0x0000000000400000-0x0000000000417000-memory.exe	cmd.exe
PID 4064 wrote to memory of 3464	4064	864-80-0x0000000000400000-0x0000000000417000-memory.exe	cmd.exe
PID 3464 wrote to memory of 4832	3464	cmd.exe	reg.exe
PID 3464 wrote to memory of 4832	3464	cmd.exe	reg.exe
PID 3464 wrote to memory of 4832	3464	cmd.exe	reg.exe
PID 4064 wrote to memory of 3192	4064	864-80-0x0000000000400000-0x0000000000417000-memory.exe	cmd.exe
PID 4064 wrote to memory of 3192	4064	864-80-0x0000000000400000-0x0000000000417000-memory.exe	cmd.exe
PID 4064 wrote to memory of 3192	4064	864-80-0x0000000000400000-0x0000000000417000-memory.exe	cmd.exe
PID 3192 wrote to memory of 2328	3192	cmd.exe	PING.EXE
PID 3192 wrote to memory of 2328	3192	cmd.exe	PING.EXE
PID 3192 wrote to memory of 2328	3192	cmd.exe	PING.EXE
PID 3192 wrote to memory of 1660	3192	cmd.exe	Microsoft Intel Audios.exe
PID 3192 wrote to memory of 1660	3192	cmd.exe	Microsoft Intel Audios.exe
PID 3192 wrote to memory of 1660	3192	cmd.exe	Microsoft Intel Audios.exe
PID 1660 wrote to memory of 1652	1660	Microsoft Intel Audios.exe	cmd.exe
PID 1660 wrote to memory of 1652	1660	Microsoft Intel Audios.exe	cmd.exe
PID 1660 wrote to memory of 1652	1660	Microsoft Intel Audios.exe	cmd.exe
PID 1660 wrote to memory of 1140	1660	Microsoft Intel Audios.exe	iexplore.exe
PID 1660 wrote to memory of 1140	1660	Microsoft Intel Audios.exe	iexplore.exe
PID 1660 wrote to memory of 1140	1660	Microsoft Intel Audios.exe	iexplore.exe
PID 1660 wrote to memory of 1140	1660	Microsoft Intel Audios.exe	iexplore.exe
PID 1660 wrote to memory of 1140	1660	Microsoft Intel Audios.exe	iexplore.exe
PID 1660 wrote to memory of 1140	1660	Microsoft Intel Audios.exe	iexplore.exe
PID 1660 wrote to memory of 1140	1660	Microsoft Intel Audios.exe	iexplore.exe
PID 1660 wrote to memory of 1140	1660	Microsoft Intel Audios.exe	iexplore.exe
PID 1660 wrote to memory of 1140	1660	Microsoft Intel Audios.exe	iexplore.exe
PID 1652 wrote to memory of 4284	1652	cmd.exe	reg.exe
PID 1652 wrote to memory of 4284	1652	cmd.exe	reg.exe
PID 1652 wrote to memory of 4284	1652	cmd.exe	reg.exe
PID 1140 wrote to memory of 2564	1140	iexplore.exe	cmd.exe
PID 1140 wrote to memory of 2564	1140	iexplore.exe	cmd.exe
PID 1140 wrote to memory of 2564	1140	iexplore.exe	cmd.exe
PID 2564 wrote to memory of 696	2564	cmd.exe	reg.exe
PID 2564 wrote to memory of 696	2564	cmd.exe	reg.exe
PID 2564 wrote to memory of 696	2564	cmd.exe	reg.exe

C:\Users\Admin\AppData\Local\Temp\864-80-0x0000000000400000-0x0000000000417000-memory.exe
"C:\Users\Admin\AppData\Local\Temp\864-80-0x0000000000400000-0x0000000000417000-memory.exe"
1⤵
- Checks computer location settings
- Adds Run key to start application
- Drops file in Windows directory
- Suspicious use of WriteProcessMemory
PID:4064

C:\Windows\SysWOW64\cmd.exe
/k %windir%\System32\reg.exe ADD HKLM\SOFTWARE\Microsoft\Windows\CurrentVersion\Policies\System /v EnableLUA /t REG_DWORD /d 0 /f
2⤵
- Suspicious use of WriteProcessMemory
PID:3464

C:\Windows\SysWOW64\reg.exe
C:\Windows\System32\reg.exe ADD HKLM\SOFTWARE\Microsoft\Windows\CurrentVersion\Policies\System /v EnableLUA /t REG_DWORD /d 0 /f
3⤵
- UAC bypass
- Modifies registry key
PID:4832

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:3192

C:\Windows\SysWOW64\PING.EXE
PING 127.0.0.1 -n 2
3⤵
- Runs ping.exe
PID:2328

C:\Windows\Audio Microsoft File\Microsoft Intel Audios.exe
"C:\Windows\Audio Microsoft File\Microsoft Intel Audios.exe"
3⤵
- Executes dropped EXE
- Adds Run key to start application
- Suspicious use of SetThreadContext
- Suspicious use of WriteProcessMemory
PID:1660

C:\Windows\SysWOW64\cmd.exe
/k %windir%\System32\reg.exe ADD HKLM\SOFTWARE\Microsoft\Windows\CurrentVersion\Policies\System /v EnableLUA /t REG_DWORD /d 0 /f
4⤵
- Suspicious use of WriteProcessMemory
PID:1652

C:\Windows\SysWOW64\reg.exe
C:\Windows\System32\reg.exe ADD HKLM\SOFTWARE\Microsoft\Windows\CurrentVersion\Policies\System /v EnableLUA /t REG_DWORD /d 0 /f
5⤵
- UAC bypass
- Modifies registry key
PID:4284

C:\Program Files (x86)\Internet Explorer\iexplore.exe
"C:\Program Files (x86)\Internet Explorer\iexplore.exe"
4⤵
- Drops file in Windows directory
- Suspicious behavior: GetForegroundWindowSpam
- Suspicious use of SetWindowsHookEx
- Suspicious use of WriteProcessMemory
PID:1140

C:\Windows\SysWOW64\cmd.exe
/k %windir%\System32\reg.exe ADD HKLM\SOFTWARE\Microsoft\Windows\CurrentVersion\Policies\System /v EnableLUA /t REG_DWORD /d 0 /f
5⤵
- Suspicious use of WriteProcessMemory
PID:2564

C:\Windows\SysWOW64\reg.exe
C:\Windows\System32\reg.exe ADD HKLM\SOFTWARE\Microsoft\Windows\CurrentVersion\Policies\System /v EnableLUA /t REG_DWORD /d 0 /f
6⤵
- UAC bypass
- Modifies registry key
PID:696

Network

MITRE ATT&CK Enterprise v6

Initial Access

Execution

Persistence

Registry Run Keys / Startup Folder

1

T1060

Privilege Escalation

Bypass User Account Control

1

T1088

Defense Evasion

Bypass User Account Control

1

T1088

Disabling Security Tools

Modify Registry

Credential Access

Discovery

Query Registry

1

T1012

Remote System Discovery

1

T1018

System Information Discovery

2

T1082

Lateral Movement

Collection

Command and Control

Exfiltration

Impact

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Downloads

C:\Users\Admin\AppData\Local\Temp\install.bat
Filesize
109B

MD5
8ddcdd0ab01b0740982e7b78b1591015

SHA1
acbb9c4bb32822a164f200f8b77eda0ce7bd758d

SHA256
7c1abbf1a20f581d2db76d769cc14cf753a412cf92e383a36ffbf0c962eaf678

SHA512
ef43e3cb89c800529530183d4315782a864281ef8a0e6443a54ccc4f1837fcbfe43027b399bb43ea114fab70416d49b3cb2539cf8bf658b4b447c4e8597959dc

Download Submit
C:\Windows\Audio Microsoft File\Microsoft Intel Audios.exe
Filesize
92KB

MD5
81decf81e0f22a06673849e16ff57b01

SHA1
de0023dc4f84a29cf2ea6238de09ba7f8deaf3cb

SHA256
2310d8f49412769bbb634a16cb272a77dcde3104405155e811d21a88712e4d13

SHA512
a484773eecc880b9975732ae4ba4ea7ca716f2e7f256344df52a09814821a63f56c9e306e248b5dfd6ca1f2b96d0c959efeb3103e397033cd98b7e34eb29bf4c

Download Submit
C:\Windows\Audio Microsoft File\Microsoft Intel Audios.exe
Filesize
92KB

MD5
81decf81e0f22a06673849e16ff57b01

SHA1
de0023dc4f84a29cf2ea6238de09ba7f8deaf3cb

SHA256
2310d8f49412769bbb634a16cb272a77dcde3104405155e811d21a88712e4d13

SHA512
a484773eecc880b9975732ae4ba4ea7ca716f2e7f256344df52a09814821a63f56c9e306e248b5dfd6ca1f2b96d0c959efeb3103e397033cd98b7e34eb29bf4c

Download Submit
memory/696-143-0x0000000000000000-mapping.dmp

Download
memory/1652-140-0x0000000000000000-mapping.dmp

Download
memory/1660-137-0x0000000000000000-mapping.dmp

Download
memory/2328-136-0x0000000000000000-mapping.dmp

Download
memory/2564-142-0x0000000000000000-mapping.dmp

Download
memory/3192-134-0x0000000000000000-mapping.dmp

Download
memory/3464-132-0x0000000000000000-mapping.dmp

Download
memory/4284-141-0x0000000000000000-mapping.dmp

Download
memory/4832-133-0x0000000000000000-mapping.dmp

Download

Analysis

Sharing

General

Malware Config

Extracted

Signatures

Processes

Network

MITRE ATT&CK Enterprise v6

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