remcos | e79648e3393883d7e4cc82daec386ecc84e88268c6aa127abfe2677d602ff08f

General

Target

REMITTAN.EXE
Size

73KB
MD5

4f0970aff8d4998eb4330f146538bb9f
SHA1

ce5b8d2203146a4e081d61b525779d13c104797f
SHA256

e3eb1466bda0d2fa25a6aefd756ed0185c86c1bfc0aa2a68a22429afa019cc6a
SHA512

dba29de31cf0b11329c1a9b5111a2dd0d8ab9995945a7f7e920620833e313ac769b757dab9167518998d73c93738d0844d5fa43e1f6014cfa5adbc98c3cc8a00

Score

10^/10

remcos persistence rat

Malware Config

Extracted

Family

remcos

C2

dollarboy1.duckdns.org:5252

Signatures

Modifies WinLogon for persistence 2 TTPs 1 IoCs

persistence

Winlogon Helper DLL

T1004

Modify Registry

T1112

Processes:

REMITTAN.EXE

description	ioc	process
Set value (str)	\REGISTRY\USER\S-1-5-21-1985363256-3005190890-1182679451-1000\Software\Microsoft\Windows NT\CurrentVersion\Winlogon\shell = "explorer.exe,\"C:\\Users\\Admin\\AppData\\Local\\Temp\\REMITTAN.EXE\""	REMITTAN.EXE

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

Drops startup file 2 IoCs

Processes:

REMITTAN.EXE

description	ioc	process
File created	C:\Users\Admin\AppData\Roaming\Microsoft\Windows\Start Menu\Programs\Startup\REMITTAN.EXE	REMITTAN.EXE
File opened for modification	C:\Users\Admin\AppData\Roaming\Microsoft\Windows\Start Menu\Programs\Startup\REMITTAN.EXE	REMITTAN.EXE

Adds Run key to start application 2 TTPs 2 IoCs

persistence

Registry Run Keys / Startup Folder

T1060

Modify Registry

T1112

Processes:

REMITTAN.EXE

description	ioc	process
Set value (str)	\REGISTRY\USER\S-1-5-21-1985363256-3005190890-1182679451-1000\Software\Microsoft\Windows\CurrentVersion\Run\<Unknown> = "C:\\Users\\Admin\\AppData\\Local\\Temp\\REMITTAN.EXE"	REMITTAN.EXE
Set value (str)	\REGISTRY\USER\S-1-5-21-1985363256-3005190890-1182679451-1000\Software\Microsoft\Windows\CurrentVersion\Run\REMITTAN.EXE = "C:\\Users\\Admin\\AppData\\Local\\Temp\\REMITTAN.EXE"	REMITTAN.EXE

Suspicious use of NtSetInformationThreadHideFromDebugger 13 IoCs

Processes:

REMITTAN.EXE

pid	process
636	REMITTAN.EXE
636	REMITTAN.EXE
636	REMITTAN.EXE
636	REMITTAN.EXE
636	REMITTAN.EXE
636	REMITTAN.EXE
636	REMITTAN.EXE
636	REMITTAN.EXE
636	REMITTAN.EXE
636	REMITTAN.EXE
636	REMITTAN.EXE
636	REMITTAN.EXE
636	REMITTAN.EXE

Suspicious use of SetThreadContext 1 IoCs

Processes:

REMITTAN.EXE

description pid process target process

PID 636 set thread context of 2420 636 REMITTAN.EXE REMITTAN.EXE
Program crash 1 IoCs

Processes:

WerFault.exe

pid pid_target process target process

2056 636 WerFault.exe REMITTAN.EXE
Delays execution with timeout.exe 1 IoCs
evasion

Processes:

timeout.exe

pid process

3984 timeout.exe

description	pid	process	target process
PID 636 set thread context of 2420	636	REMITTAN.EXE	REMITTAN.EXE

pid	pid_target	process	target process
2056	636	WerFault.exe	REMITTAN.EXE

pid	process
3984	timeout.exe

Suspicious behavior: EnumeratesProcesses 19 IoCs

Processes:

REMITTAN.EXEWerFault.exe

pid	process
636	REMITTAN.EXE
636	REMITTAN.EXE
636	REMITTAN.EXE
636	REMITTAN.EXE
636	REMITTAN.EXE
2056	WerFault.exe
2056	WerFault.exe
2056	WerFault.exe
2056	WerFault.exe
2056	WerFault.exe
2056	WerFault.exe
2056	WerFault.exe
2056	WerFault.exe
2056	WerFault.exe
2056	WerFault.exe
2056	WerFault.exe
2056	WerFault.exe
2056	WerFault.exe
2056	WerFault.exe

Suspicious behavior: GetForegroundWindowSpam 1 IoCs

Processes:

REMITTAN.EXE

pid process

2420 REMITTAN.EXE

pid	process
2420	REMITTAN.EXE

Suspicious use of AdjustPrivilegeToken 4 IoCs

Processes:

REMITTAN.EXEWerFault.exe

description	pid	process
Token: SeDebugPrivilege	636	REMITTAN.EXE
Token: SeRestorePrivilege	2056	WerFault.exe
Token: SeBackupPrivilege	2056	WerFault.exe
Token: SeDebugPrivilege	2056	WerFault.exe

Suspicious use of SetWindowsHookEx 1 IoCs

Processes:

REMITTAN.EXE

pid process

2420 REMITTAN.EXE

pid	process
2420	REMITTAN.EXE

Suspicious use of WriteProcessMemory 15 IoCs

Processes:

REMITTAN.EXE

description	pid	process	target process
PID 636 wrote to memory of 3984	636	REMITTAN.EXE	timeout.exe
PID 636 wrote to memory of 3984	636	REMITTAN.EXE	timeout.exe
PID 636 wrote to memory of 3984	636	REMITTAN.EXE	timeout.exe
PID 636 wrote to memory of 3228	636	REMITTAN.EXE	REMITTAN.EXE
PID 636 wrote to memory of 3228	636	REMITTAN.EXE	REMITTAN.EXE
PID 636 wrote to memory of 3228	636	REMITTAN.EXE	REMITTAN.EXE
PID 636 wrote to memory of 2420	636	REMITTAN.EXE	REMITTAN.EXE
PID 636 wrote to memory of 2420	636	REMITTAN.EXE	REMITTAN.EXE
PID 636 wrote to memory of 2420	636	REMITTAN.EXE	REMITTAN.EXE
PID 636 wrote to memory of 2420	636	REMITTAN.EXE	REMITTAN.EXE
PID 636 wrote to memory of 2420	636	REMITTAN.EXE	REMITTAN.EXE
PID 636 wrote to memory of 2420	636	REMITTAN.EXE	REMITTAN.EXE
PID 636 wrote to memory of 2420	636	REMITTAN.EXE	REMITTAN.EXE
PID 636 wrote to memory of 2420	636	REMITTAN.EXE	REMITTAN.EXE
PID 636 wrote to memory of 2420	636	REMITTAN.EXE	REMITTAN.EXE

C:\Users\Admin\AppData\Local\Temp\REMITTAN.EXE
"C:\Users\Admin\AppData\Local\Temp\REMITTAN.EXE"
1⤵
- Modifies WinLogon for persistence
- Drops startup file
- Adds Run key to start application
- Suspicious use of NtSetInformationThreadHideFromDebugger
- Suspicious use of SetThreadContext
- Suspicious behavior: EnumeratesProcesses
- Suspicious use of AdjustPrivilegeToken
- Suspicious use of WriteProcessMemory
PID:636

C:\Windows\SysWOW64\timeout.exe
timeout 22
2⤵
- Delays execution with timeout.exe
PID:3984

C:\Users\Admin\AppData\Local\Temp\REMITTAN.EXE
"C:\Users\Admin\AppData\Local\Temp\REMITTAN.EXE"
2⤵
PID:3228

C:\Users\Admin\AppData\Local\Temp\REMITTAN.EXE
"C:\Users\Admin\AppData\Local\Temp\REMITTAN.EXE"
2⤵
- Suspicious behavior: GetForegroundWindowSpam
- Suspicious use of SetWindowsHookEx
PID:2420

C:\Windows\SysWOW64\WerFault.exe
C:\Windows\SysWOW64\WerFault.exe -u -p 636 -s 1784
2⤵
- Program crash
- Suspicious behavior: EnumeratesProcesses
- Suspicious use of AdjustPrivilegeToken
PID:2056

Network

MITRE ATT&CK Matrix ATT&CK v6

Initial Access

Execution

Persistence

Winlogon Helper DLL

1

T1004

Registry Run Keys / Startup Folder

1

T1060

Privilege Escalation

Defense Evasion

Modify Registry

2

T1112

Credential Access

Discovery

Lateral Movement

Collection

Exfiltration

Command and Control

Impact

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Downloads

memory/636-0-0x0000000073E00000-0x00000000744EE000-memory.dmp

Filesize
6.9MB

Download
memory/636-1-0x00000000005A0000-0x00000000005A1000-memory.dmp

Filesize
4KB

Download
memory/636-3-0x0000000004E10000-0x0000000004E11000-memory.dmp

Filesize
4KB

Download
memory/636-5-0x0000000000EE0000-0x0000000000F4E000-memory.dmp

Filesize
440KB

Download
memory/636-6-0x0000000006F30000-0x0000000006F31000-memory.dmp

Filesize
4KB

Download
memory/2056-10-0x0000000004ED0000-0x0000000004ED1000-memory.dmp

Filesize
4KB

Download
memory/2056-11-0x0000000005690000-0x0000000005691000-memory.dmp

Filesize
4KB

Download
memory/2420-7-0x0000000000400000-0x0000000000418000-memory.dmp

Filesize
96KB

Download
memory/2420-8-0x000000000040FD88-mapping.dmp

Download
memory/2420-9-0x0000000000400000-0x0000000000418000-memory.dmp

Filesize
96KB

Download
memory/3984-4-0x0000000000000000-mapping.dmp

Download

Analysis

Sharing

General

Malware Config

Extracted

Signatures

Processes

Network

MITRE ATT&CK Matrix ATT&CK v6

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Downloads