remcos | e3fceaabe401036d5b259a767747f86c6563db8d122c87e70506ce84ad622638

Analysis

max time kernel
148s
max time network
149s
platform
windows10_x64
resource
win10v20201028
submitted
19-01-2021 13:09

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General

Target

PO.exe
Size

167KB
MD5

b83b2773148e40f003ffd62920a88ab1
SHA1

c738d07984d406be0aa87d36eae86e7fa81f68b7
SHA256

e3fceaabe401036d5b259a767747f86c6563db8d122c87e70506ce84ad622638
SHA512

eb2b4286611d6515b72cafdef2c7f73626f86b73060d424862df6e9a5ff5fe29159ea6bb39e501a943e500d8404aecedaf5be07fe40aa49e5952e931895efa2e

Score

10^/10

remcos persistence rat spyware

Malware Config

Extracted

Family

remcos

eileenwmsscm.duckdns.org:2558

Signatures

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

NirSoft MailPassView 1 IoCs

Password recovery tool for various email clients

Processes:

resource	yara_rule
behavioral2/memory/1984-23-0x0000000000455238-mapping.dmp	MailPassView

NirSoft WebBrowserPassView 1 IoCs

Password recovery tool for various web browsers

Processes:

resource	yara_rule
behavioral2/memory/4348-17-0x0000000000476274-mapping.dmp	WebBrowserPassView

Nirsoft 3 IoCs

Processes:

resource	yara_rule
behavioral2/memory/4356-20-0x0000000000422206-mapping.dmp	Nirsoft
behavioral2/memory/1984-23-0x0000000000455238-mapping.dmp	Nirsoft
behavioral2/memory/4348-17-0x0000000000476274-mapping.dmp	Nirsoft

Executes dropped EXE 5 IoCs

Processes:

remcos.exeremcos.exeremcos.exeremcos.exeremcos.exe

pid process

3880 remcos.exe
4028 remcos.exe
4348 remcos.exe
4356 remcos.exe
1984 remcos.exe
Reads user/profile data of web browsers 2 TTPs
Infostealers often target stored browser data, which can include saved credentials etc.
spyware

Data from Local System
T1005

Credentials in Files
T1081

pid	process
3880	remcos.exe
4028	remcos.exe
4348	remcos.exe
4356	remcos.exe
1984	remcos.exe

Adds Run key to start application 2 TTPs 4 IoCs

persistence

Registry Run Keys / Startup Folder

T1060

Modify Registry

T1112

Processes:

PO.exeremcos.exe

description	ioc	process
Key created	\REGISTRY\USER\S-1-5-21-3341490333-719741536-2920803124-1000\Software\Microsoft\Windows\CurrentVersion\Run\	PO.exe
Set value (str)	\REGISTRY\USER\S-1-5-21-3341490333-719741536-2920803124-1000\Software\Microsoft\Windows\CurrentVersion\Run\Remcos = "\"C:\\Users\\Admin\\AppData\\Roaming\\Remcos\\remcos.exe\""	PO.exe
Key created	\REGISTRY\USER\S-1-5-21-3341490333-719741536-2920803124-1000\Software\Microsoft\Windows\CurrentVersion\Run\	remcos.exe
Set value (str)	\REGISTRY\USER\S-1-5-21-3341490333-719741536-2920803124-1000\Software\Microsoft\Windows\CurrentVersion\Run\Remcos = "\"C:\\Users\\Admin\\AppData\\Roaming\\Remcos\\remcos.exe\""	remcos.exe

Suspicious use of SetThreadContext 5 IoCs

Processes:

PO.exeremcos.exeremcos.exe

description	pid	process	target process
PID 4652 set thread context of 3852	4652	PO.exe	PO.exe
PID 3880 set thread context of 4028	3880	remcos.exe	remcos.exe
PID 4028 set thread context of 4348	4028	remcos.exe	remcos.exe
PID 4028 set thread context of 4356	4028	remcos.exe	remcos.exe
PID 4028 set thread context of 1984	4028	remcos.exe	remcos.exe

Creates scheduled task(s) 1 TTPs 1 IoCs
Schtasks is often used by malware for persistence or to perform post-infection execution.
persistence

Scheduled Task
T1053

Processes:

schtasks.exe

pid process

3492 schtasks.exe
Modifies registry class 1 IoCs

Processes:

PO.exe

description ioc process

Key created \REGISTRY\USER\S-1-5-21-3341490333-719741536-2920803124-1000_Classes\Local Settings PO.exe
Suspicious behavior: EnumeratesProcesses 6 IoCs

Processes:

remcos.exeremcos.exe

pid process

4348 remcos.exe
4348 remcos.exe
4356 remcos.exe
4356 remcos.exe
4348 remcos.exe
4348 remcos.exe
Suspicious behavior: MapViewOfSection 2 IoCs

Processes:

PO.exeremcos.exe

pid process

4652 PO.exe
3880 remcos.exe
Suspicious use of AdjustPrivilegeToken 1 IoCs

Processes:

remcos.exe

description pid process

Token: SeDebugPrivilege 4356 remcos.exe
Suspicious use of SetWindowsHookEx 1 IoCs

Processes:

remcos.exe

pid process

4028 remcos.exe

pid	process
3492	schtasks.exe

description	ioc	process
Key created	\REGISTRY\USER\S-1-5-21-3341490333-719741536-2920803124-1000_Classes\Local Settings	PO.exe

pid	process
4348	remcos.exe
4348	remcos.exe
4356	remcos.exe
4356	remcos.exe
4348	remcos.exe
4348	remcos.exe

pid	process
4652	PO.exe
3880	remcos.exe

description	pid	process
Token: SeDebugPrivilege	4356	remcos.exe

pid	process
4028	remcos.exe

Suspicious use of WriteProcessMemory 47 IoCs

Processes:

PO.execmd.exePO.exeWScript.execmd.exeremcos.exeremcos.exe

description	pid	process	target process
PID 4652 wrote to memory of 2980	4652	PO.exe	cmd.exe
PID 4652 wrote to memory of 2980	4652	PO.exe	cmd.exe
PID 4652 wrote to memory of 2980	4652	PO.exe	cmd.exe
PID 4652 wrote to memory of 3852	4652	PO.exe	PO.exe
PID 4652 wrote to memory of 3852	4652	PO.exe	PO.exe
PID 4652 wrote to memory of 3852	4652	PO.exe	PO.exe
PID 4652 wrote to memory of 3852	4652	PO.exe	PO.exe
PID 2980 wrote to memory of 3492	2980	cmd.exe	schtasks.exe
PID 2980 wrote to memory of 3492	2980	cmd.exe	schtasks.exe
PID 2980 wrote to memory of 3492	2980	cmd.exe	schtasks.exe
PID 3852 wrote to memory of 3572	3852	PO.exe	WScript.exe
PID 3852 wrote to memory of 3572	3852	PO.exe	WScript.exe
PID 3852 wrote to memory of 3572	3852	PO.exe	WScript.exe
PID 3572 wrote to memory of 4184	3572	WScript.exe	cmd.exe
PID 3572 wrote to memory of 4184	3572	WScript.exe	cmd.exe
PID 3572 wrote to memory of 4184	3572	WScript.exe	cmd.exe
PID 4184 wrote to memory of 3880	4184	cmd.exe	remcos.exe
PID 4184 wrote to memory of 3880	4184	cmd.exe	remcos.exe
PID 4184 wrote to memory of 3880	4184	cmd.exe	remcos.exe
PID 3880 wrote to memory of 4028	3880	remcos.exe	remcos.exe
PID 3880 wrote to memory of 4028	3880	remcos.exe	remcos.exe
PID 3880 wrote to memory of 4028	3880	remcos.exe	remcos.exe
PID 3880 wrote to memory of 4028	3880	remcos.exe	remcos.exe
PID 4028 wrote to memory of 4348	4028	remcos.exe	remcos.exe
PID 4028 wrote to memory of 4348	4028	remcos.exe	remcos.exe
PID 4028 wrote to memory of 4348	4028	remcos.exe	remcos.exe
PID 4028 wrote to memory of 4348	4028	remcos.exe	remcos.exe
PID 4028 wrote to memory of 4348	4028	remcos.exe	remcos.exe
PID 4028 wrote to memory of 4348	4028	remcos.exe	remcos.exe
PID 4028 wrote to memory of 4348	4028	remcos.exe	remcos.exe
PID 4028 wrote to memory of 4348	4028	remcos.exe	remcos.exe
PID 4028 wrote to memory of 4356	4028	remcos.exe	remcos.exe
PID 4028 wrote to memory of 4356	4028	remcos.exe	remcos.exe
PID 4028 wrote to memory of 4356	4028	remcos.exe	remcos.exe
PID 4028 wrote to memory of 4356	4028	remcos.exe	remcos.exe
PID 4028 wrote to memory of 4356	4028	remcos.exe	remcos.exe
PID 4028 wrote to memory of 4356	4028	remcos.exe	remcos.exe
PID 4028 wrote to memory of 4356	4028	remcos.exe	remcos.exe
PID 4028 wrote to memory of 4356	4028	remcos.exe	remcos.exe
PID 4028 wrote to memory of 1984	4028	remcos.exe	remcos.exe
PID 4028 wrote to memory of 1984	4028	remcos.exe	remcos.exe
PID 4028 wrote to memory of 1984	4028	remcos.exe	remcos.exe
PID 4028 wrote to memory of 1984	4028	remcos.exe	remcos.exe
PID 4028 wrote to memory of 1984	4028	remcos.exe	remcos.exe
PID 4028 wrote to memory of 1984	4028	remcos.exe	remcos.exe
PID 4028 wrote to memory of 1984	4028	remcos.exe	remcos.exe
PID 4028 wrote to memory of 1984	4028	remcos.exe	remcos.exe

C:\Users\Admin\AppData\Local\Temp\PO.exe
"C:\Users\Admin\AppData\Local\Temp\PO.exe"
1⤵
- Suspicious use of SetThreadContext
- Suspicious behavior: MapViewOfSection
- Suspicious use of WriteProcessMemory
PID:4652

C:\Windows\SysWOW64\cmd.exe
"C:\Windows\System32\cmd.exe" /c schtasks /Create /TN name /XML "C:\Users\Admin\AppData\Local\Temp\631efcfa33984133a4d53cafd1db6808.xml"
2⤵
- Suspicious use of WriteProcessMemory
PID:2980

C:\Windows\SysWOW64\schtasks.exe
schtasks /Create /TN name /XML "C:\Users\Admin\AppData\Local\Temp\631efcfa33984133a4d53cafd1db6808.xml"
3⤵
- Creates scheduled task(s)
PID:3492

C:\Users\Admin\AppData\Local\Temp\PO.exe
"C:\Users\Admin\AppData\Local\Temp\PO.exe"
2⤵
- Adds Run key to start application
- Modifies registry class
- Suspicious use of WriteProcessMemory
PID:3852

C:\Windows\SysWOW64\WScript.exe
"C:\Windows\System32\WScript.exe" "C:\Users\Admin\AppData\Local\Temp\install.vbs"
3⤵
- Suspicious use of WriteProcessMemory
PID:3572

C:\Windows\SysWOW64\cmd.exe
"C:\Windows\System32\cmd.exe" /c "C:\Users\Admin\AppData\Roaming\Remcos\remcos.exe"
4⤵
- Suspicious use of WriteProcessMemory
PID:4184

C:\Users\Admin\AppData\Roaming\Remcos\remcos.exe
C:\Users\Admin\AppData\Roaming\Remcos\remcos.exe
5⤵
- Executes dropped EXE
- Suspicious use of SetThreadContext
- Suspicious behavior: MapViewOfSection
- Suspicious use of WriteProcessMemory
PID:3880

C:\Users\Admin\AppData\Roaming\Remcos\remcos.exe
C:\Users\Admin\AppData\Roaming\Remcos\remcos.exe
6⤵
- Executes dropped EXE
- Adds Run key to start application
- Suspicious use of SetThreadContext
- Suspicious use of SetWindowsHookEx
- Suspicious use of WriteProcessMemory
PID:4028

C:\Users\Admin\AppData\Roaming\Remcos\remcos.exe
C:\Users\Admin\AppData\Roaming\Remcos\remcos.exe /stext "C:\Users\Admin\AppData\Local\Temp\hjhhntvhqlp"
7⤵
- Executes dropped EXE
- Suspicious behavior: EnumeratesProcesses
PID:4348

C:\Users\Admin\AppData\Roaming\Remcos\remcos.exe
C:\Users\Admin\AppData\Roaming\Remcos\remcos.exe /stext "C:\Users\Admin\AppData\Local\Temp\kduaolgjethegu"
7⤵
- Executes dropped EXE
- Suspicious behavior: EnumeratesProcesses
- Suspicious use of AdjustPrivilegeToken
PID:4356

C:\Users\Admin\AppData\Roaming\Remcos\remcos.exe
C:\Users\Admin\AppData\Roaming\Remcos\remcos.exe /stext "C:\Users\Admin\AppData\Local\Temp\ufzkpdrdsbajiahbu"
7⤵
- Executes dropped EXE
PID:1984

Network

MITRE ATT&CK Matrix ATT&CK v6

Initial Access

Execution

Scheduled Task

T1053

Persistence

Registry Run Keys / Startup Folder

T1060

Scheduled Task

T1053

Privilege Escalation

Scheduled Task

T1053

Defense Evasion

Modify Registry

T1112

Credential Access

Credentials in Files

T1081

Discovery

Lateral Movement

Collection

Data from Local System

T1005

Exfiltration

Command and Control

Impact

Replay Monitor

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Downloads

C:\Users\Admin\AppData\Local\Temp\631efcfa33984133a4d53cafd1db6808.xml
MD5
aa2f6636e997aaa0b01fbc78b1dabe52

SHA1
fd462100fc91975dcbea8e361cf1eb8a70f6ad54

SHA256
d710b6eda22285684579d8b547e5be2f48883c4bf8db39993b00df30f9dc8723

SHA512
6540a3bbdbd3ab51679d5b32380e6c288bf6eba2777d067d40bfe65642ccafecd18028b102dfa46ac189d84282da2b6cb202a4f307587c5639f86834788f5104

Download Submit
C:\Users\Admin\AppData\Local\Temp\hjhhntvhqlp
MD5
1e69b6d630e694119f4f8c448a430b60

SHA1
b118feca7d85ec706b54279a1dafc71673fe6e54

SHA256
2f7eedbe9e3b0a3aa08df4fa2dc27de189484a8da8925cc6056513d744b7c00e

SHA512
19924161f75cbbcf7bdf122f3aecb43d813186a6693413ccc15bb2945d48401c8f058edf034cc641cedc97ae5e328d88fabfab1b5f324014b83671b3ebd78822

Download Submit
C:\Users\Admin\AppData\Local\Temp\install.vbs
MD5
b92d64fe5b1d1f59df4b738262aea8df

SHA1
c8fb1981759c2d9bb2ec91b705985fba5fc7af63

SHA256
fa20e9aab03dc8e9f1910aaf0cf42662379fa16ae3a22642084fb97fa3d4f83a

SHA512
2566248b93c0cfb0414f033b8dd18bbd4f88180093eac2861107289bcb4ee160f9593706ff1f7d1f2e4ecea430d67a5a2897551a4f9ebd82b707243e300520e2

Download Submit
C:\Users\Admin\AppData\Roaming\Remcos\remcos.exe
MD5
b83b2773148e40f003ffd62920a88ab1

SHA1
c738d07984d406be0aa87d36eae86e7fa81f68b7

SHA256
e3fceaabe401036d5b259a767747f86c6563db8d122c87e70506ce84ad622638

SHA512
eb2b4286611d6515b72cafdef2c7f73626f86b73060d424862df6e9a5ff5fe29159ea6bb39e501a943e500d8404aecedaf5be07fe40aa49e5952e931895efa2e

Download Submit
C:\Users\Admin\AppData\Roaming\Remcos\remcos.exe
MD5
b83b2773148e40f003ffd62920a88ab1

SHA1
c738d07984d406be0aa87d36eae86e7fa81f68b7

SHA256
e3fceaabe401036d5b259a767747f86c6563db8d122c87e70506ce84ad622638

SHA512
eb2b4286611d6515b72cafdef2c7f73626f86b73060d424862df6e9a5ff5fe29159ea6bb39e501a943e500d8404aecedaf5be07fe40aa49e5952e931895efa2e

Download Submit
C:\Users\Admin\AppData\Roaming\Remcos\remcos.exe
MD5
b83b2773148e40f003ffd62920a88ab1

SHA1
c738d07984d406be0aa87d36eae86e7fa81f68b7

SHA256
e3fceaabe401036d5b259a767747f86c6563db8d122c87e70506ce84ad622638

SHA512
eb2b4286611d6515b72cafdef2c7f73626f86b73060d424862df6e9a5ff5fe29159ea6bb39e501a943e500d8404aecedaf5be07fe40aa49e5952e931895efa2e

Download Submit
C:\Users\Admin\AppData\Roaming\Remcos\remcos.exe
MD5
b83b2773148e40f003ffd62920a88ab1

SHA1
c738d07984d406be0aa87d36eae86e7fa81f68b7

SHA256
e3fceaabe401036d5b259a767747f86c6563db8d122c87e70506ce84ad622638

SHA512
eb2b4286611d6515b72cafdef2c7f73626f86b73060d424862df6e9a5ff5fe29159ea6bb39e501a943e500d8404aecedaf5be07fe40aa49e5952e931895efa2e

Download Submit
C:\Users\Admin\AppData\Roaming\Remcos\remcos.exe
MD5
b83b2773148e40f003ffd62920a88ab1

SHA1
c738d07984d406be0aa87d36eae86e7fa81f68b7

SHA256
e3fceaabe401036d5b259a767747f86c6563db8d122c87e70506ce84ad622638

SHA512
eb2b4286611d6515b72cafdef2c7f73626f86b73060d424862df6e9a5ff5fe29159ea6bb39e501a943e500d8404aecedaf5be07fe40aa49e5952e931895efa2e

Download Submit
C:\Users\Admin\AppData\Roaming\Remcos\remcos.exe
MD5
b83b2773148e40f003ffd62920a88ab1

SHA1
c738d07984d406be0aa87d36eae86e7fa81f68b7

SHA256
e3fceaabe401036d5b259a767747f86c6563db8d122c87e70506ce84ad622638

SHA512
eb2b4286611d6515b72cafdef2c7f73626f86b73060d424862df6e9a5ff5fe29159ea6bb39e501a943e500d8404aecedaf5be07fe40aa49e5952e931895efa2e

Download Submit
memory/1984-22-0x0000000000400000-0x0000000000457000-memory.dmp

Filesize
348KB

Download
memory/1984-27-0x0000000000400000-0x0000000000457000-memory.dmp

Filesize
348KB

Download
memory/1984-23-0x0000000000455238-mapping.dmp

Download
memory/2980-2-0x0000000000000000-mapping.dmp

Download
memory/3492-4-0x0000000000000000-mapping.dmp

Download
memory/3572-5-0x0000000000000000-mapping.dmp

Download
memory/3852-8-0x0000000000400000-0x0000000000421000-memory.dmp

Filesize
132KB

Download
memory/3852-3-0x0000000000413FA4-mapping.dmp

Download
memory/3880-10-0x0000000000000000-mapping.dmp

Download
memory/4028-15-0x0000000000400000-0x0000000000421000-memory.dmp

Filesize
132KB

Download
memory/4028-13-0x0000000000413FA4-mapping.dmp

Download
memory/4184-9-0x0000000000000000-mapping.dmp

Download
memory/4348-25-0x0000000000400000-0x0000000000478000-memory.dmp

Filesize
480KB

Download
memory/4348-17-0x0000000000476274-mapping.dmp

Download
memory/4348-16-0x0000000000400000-0x0000000000478000-memory.dmp

Filesize
480KB

Download
memory/4356-26-0x0000000000400000-0x0000000000424000-memory.dmp

Filesize
144KB

Download
memory/4356-19-0x0000000000400000-0x0000000000424000-memory.dmp

Filesize
144KB

Download
memory/4356-20-0x0000000000422206-mapping.dmp

Download