remcos | a16800dbbc35690f64fb554acd3bbd0d9e4f54e8404a99dac0aacc9e41916f20

General

Target

New_Payment_Advice-04-08-2021.exe
Size

1.1MB
MD5

b406cc9e628e1622fdeb6c19bc119869
SHA1

8154bf8ee1d7c43ce0743dee7c5d102e91dbea78
SHA256

a16800dbbc35690f64fb554acd3bbd0d9e4f54e8404a99dac0aacc9e41916f20
SHA512

d3354be9347ce446e1a4b108d309429862c48b49f99e2248c29f8224b2c7650cd70167e46560d0b96b1898a60780381f5686e1e28b060be66091a8d7a758eb75

Score

10^/10

remcos agilenet evasion persistence rat trojan

Malware Config

Extracted

Family

remcos

C2

79.134.225.78:2404

Signatures

Remcos
Remcos is a closed-source remote control and surveillance software.
rat remcos
UAC bypass 3 TTPs
evasion trojan

Bypass User Account Control
T1088

Disabling Security Tools
T1089

Modify Registry
T1112

Adds policy Run key to start application 2 TTPs 2 IoCs

persistence

Registry Run Keys / Startup Folder

T1060

Modify Registry

T1112

Processes:

svchost.exe

description	ioc	process
Key created	\REGISTRY\MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Policies\Explorer\Run	svchost.exe
Set value (str)	\REGISTRY\MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Policies\Explorer\Run\Java Update = "\"C:\\Windows\\SysWOW64\\taskmgr\\taskmgr.exe\""	svchost.exe

Executes dropped EXE 2 IoCs

Processes:

svchost.exetaskmgr.exe

pid process

1340 svchost.exe
2204 taskmgr.exe

pid	process
1340	svchost.exe
2204	taskmgr.exe

Obfuscated with Agile.Net obfuscator 2 IoCs

Detects use of the Agile.Net commercial obfuscator, which is capable of entity renaming and control flow obfuscation.

agilenet

Processes:

resource	yara_rule
behavioral2/memory/640-121-0x00000000060F0000-0x0000000006111000-memory.dmp	agile_net
behavioral2/memory/640-124-0x0000000004BF0000-0x00000000050EE000-memory.dmp	agile_net

Adds Run key to start application 2 TTPs 2 IoCs

persistence

Registry Run Keys / Startup Folder

T1060

Modify Registry

T1112

Processes:

svchost.exe

description	ioc	process
Key created	\REGISTRY\USER\S-1-5-21-1594587808-2047097707-2163810515-1000\Software\Microsoft\Windows\CurrentVersion\Run\	svchost.exe
Set value (str)	\REGISTRY\USER\S-1-5-21-1594587808-2047097707-2163810515-1000\Software\Microsoft\Windows\CurrentVersion\Run\Java Update = "\"C:\\Windows\\SysWOW64\\taskmgr\\taskmgr.exe\""	svchost.exe

Drops file in System32 directory 3 IoCs

Processes:

svchost.exe

description	ioc	process
File opened for modification	C:\Windows\SysWOW64\taskmgr	svchost.exe
File created	C:\Windows\SysWOW64\taskmgr\taskmgr.exe	svchost.exe
File opened for modification	C:\Windows\SysWOW64\taskmgr\taskmgr.exe	svchost.exe

Suspicious use of SetThreadContext 1 IoCs

Processes:

New_Payment_Advice-04-08-2021.exe

description pid process target process

PID 640 set thread context of 1340 640 New_Payment_Advice-04-08-2021.exe svchost.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 class 1 IoCs

Processes:

svchost.exe

description ioc process

Key created \REGISTRY\USER\S-1-5-21-1594587808-2047097707-2163810515-1000_Classes\Local Settings svchost.exe
Modifies registry key 1 TTPs 1 IoCs

Modify Registry
T1112

Processes:

reg.exe

pid process

3896 reg.exe
Suspicious behavior: EnumeratesProcesses 2 IoCs

Processes:

New_Payment_Advice-04-08-2021.exe

pid process

640 New_Payment_Advice-04-08-2021.exe
640 New_Payment_Advice-04-08-2021.exe
Suspicious use of AdjustPrivilegeToken 1 IoCs

Processes:

New_Payment_Advice-04-08-2021.exe

description pid process

Token: SeDebugPrivilege 640 New_Payment_Advice-04-08-2021.exe

description	pid	process	target process
PID 640 set thread context of 1340	640	New_Payment_Advice-04-08-2021.exe	svchost.exe

description	ioc	process
Key created	\REGISTRY\USER\S-1-5-21-1594587808-2047097707-2163810515-1000_Classes\Local Settings	svchost.exe

pid	process
3896	reg.exe

pid	process
640	New_Payment_Advice-04-08-2021.exe
640	New_Payment_Advice-04-08-2021.exe

description	pid	process
Token: SeDebugPrivilege	640	New_Payment_Advice-04-08-2021.exe

Suspicious use of WriteProcessMemory 27 IoCs

Processes:

New_Payment_Advice-04-08-2021.exesvchost.execmd.exeWScript.execmd.exe

description	pid	process	target process
PID 640 wrote to memory of 1340	640	New_Payment_Advice-04-08-2021.exe	svchost.exe
PID 640 wrote to memory of 1340	640	New_Payment_Advice-04-08-2021.exe	svchost.exe
PID 640 wrote to memory of 1340	640	New_Payment_Advice-04-08-2021.exe	svchost.exe
PID 640 wrote to memory of 1340	640	New_Payment_Advice-04-08-2021.exe	svchost.exe
PID 640 wrote to memory of 1340	640	New_Payment_Advice-04-08-2021.exe	svchost.exe
PID 640 wrote to memory of 1340	640	New_Payment_Advice-04-08-2021.exe	svchost.exe
PID 640 wrote to memory of 1340	640	New_Payment_Advice-04-08-2021.exe	svchost.exe
PID 640 wrote to memory of 1340	640	New_Payment_Advice-04-08-2021.exe	svchost.exe
PID 640 wrote to memory of 1340	640	New_Payment_Advice-04-08-2021.exe	svchost.exe
PID 640 wrote to memory of 1340	640	New_Payment_Advice-04-08-2021.exe	svchost.exe
PID 640 wrote to memory of 1340	640	New_Payment_Advice-04-08-2021.exe	svchost.exe
PID 640 wrote to memory of 1340	640	New_Payment_Advice-04-08-2021.exe	svchost.exe
PID 1340 wrote to memory of 2120	1340	svchost.exe	cmd.exe
PID 1340 wrote to memory of 2120	1340	svchost.exe	cmd.exe
PID 1340 wrote to memory of 2120	1340	svchost.exe	cmd.exe
PID 2120 wrote to memory of 3896	2120	cmd.exe	reg.exe
PID 2120 wrote to memory of 3896	2120	cmd.exe	reg.exe
PID 2120 wrote to memory of 3896	2120	cmd.exe	reg.exe
PID 1340 wrote to memory of 3984	1340	svchost.exe	WScript.exe
PID 1340 wrote to memory of 3984	1340	svchost.exe	WScript.exe
PID 1340 wrote to memory of 3984	1340	svchost.exe	WScript.exe
PID 3984 wrote to memory of 3760	3984	WScript.exe	cmd.exe
PID 3984 wrote to memory of 3760	3984	WScript.exe	cmd.exe
PID 3984 wrote to memory of 3760	3984	WScript.exe	cmd.exe
PID 3760 wrote to memory of 2204	3760	cmd.exe	taskmgr.exe
PID 3760 wrote to memory of 2204	3760	cmd.exe	taskmgr.exe
PID 3760 wrote to memory of 2204	3760	cmd.exe	taskmgr.exe

C:\Users\Admin\AppData\Local\Temp\New_Payment_Advice-04-08-2021.exe
"C:\Users\Admin\AppData\Local\Temp\New_Payment_Advice-04-08-2021.exe"
1⤵
- Suspicious use of SetThreadContext
- Suspicious behavior: EnumeratesProcesses
- Suspicious use of AdjustPrivilegeToken
- Suspicious use of WriteProcessMemory
PID:640

C:\Users\Admin\AppData\Local\Temp\svchost.exe
"C:\Users\Admin\AppData\Local\Temp\svchost.exe"
2⤵
- Adds policy Run key to start application
- Executes dropped EXE
- Adds Run key to start application
- Drops file in System32 directory
- Modifies registry class
- Suspicious use of WriteProcessMemory
PID:1340

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
3⤵
- Suspicious use of WriteProcessMemory
PID:2120

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
4⤵
- Modifies registry key
PID:3896

C:\Windows\SysWOW64\WScript.exe
"C:\Windows\System32\WScript.exe" "C:\Users\Admin\AppData\Local\Temp\install.vbs"
3⤵
- Suspicious use of WriteProcessMemory
PID:3984

C:\Windows\SysWOW64\cmd.exe
"C:\Windows\System32\cmd.exe" /c "C:\Windows\SysWOW64\taskmgr\taskmgr.exe"
4⤵
- Suspicious use of WriteProcessMemory
PID:3760

C:\Windows\SysWOW64\taskmgr\taskmgr.exe
C:\Windows\SysWOW64\taskmgr\taskmgr.exe
5⤵
- Executes dropped EXE
PID:2204

Network

MITRE ATT&CK Matrix ATT&CK v6

Initial Access

Execution

Persistence

Registry Run Keys / Startup Folder

2

T1060

Privilege Escalation

Bypass User Account Control

1

T1088

Defense Evasion

Bypass User Account Control

1

T1088

Disabling Security Tools

1

T1089

Modify Registry

4

T1112

Credential Access

Discovery

System Information Discovery

1

T1082

Lateral Movement

Collection

Exfiltration

Command and Control

Impact

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Downloads

C:\Users\Admin\AppData\Local\Temp\install.vbs
MD5
d541f4a8502d1116bea2c70cb7f56705

SHA1
eea882f194859a8fe88485a64a95e9000e799a1d

SHA256
a396bb9df0f318789858a5db9f1fce7d70da880ccdf9f3cc4bef4a826a5a9f83

SHA512
58c57bed7ca8778d9a8834e3546e306200325b11fe4c6864a8bd114a3943113cd5a87f447b88af4ad9d2aaab764a547e57ef14f96bccefd407cbddbd6f87b06b

Download Submit
C:\Users\Admin\AppData\Local\Temp\svchost.exe
MD5
6bdb3091562e7dd2c877472286b6cc46

SHA1
122ecbb7a23dc98c61f319cfb060f3cbd407db89

SHA256
87e4144b3f50e9a0635ea6a887a20ef0d7b1321a79793f9fa965b8defbdef698

SHA512
219d646d5d514c705f801cacc736ca1027613d6612c1d30a8d4156143f5344b125a297080926912e7abf94a09b80cae157ac44773e84dd95946a9feb44b10e94

Download Submit
C:\Users\Admin\AppData\Local\Temp\svchost.exe
MD5
6bdb3091562e7dd2c877472286b6cc46

SHA1
122ecbb7a23dc98c61f319cfb060f3cbd407db89

SHA256
87e4144b3f50e9a0635ea6a887a20ef0d7b1321a79793f9fa965b8defbdef698

SHA512
219d646d5d514c705f801cacc736ca1027613d6612c1d30a8d4156143f5344b125a297080926912e7abf94a09b80cae157ac44773e84dd95946a9feb44b10e94

Download Submit
C:\Windows\SysWOW64\taskmgr\taskmgr.exe
MD5
6bdb3091562e7dd2c877472286b6cc46

SHA1
122ecbb7a23dc98c61f319cfb060f3cbd407db89

SHA256
87e4144b3f50e9a0635ea6a887a20ef0d7b1321a79793f9fa965b8defbdef698

SHA512
219d646d5d514c705f801cacc736ca1027613d6612c1d30a8d4156143f5344b125a297080926912e7abf94a09b80cae157ac44773e84dd95946a9feb44b10e94

Download Submit
memory/640-121-0x00000000060F0000-0x0000000006111000-memory.dmp

Filesize
132KB

Download
memory/640-118-0x0000000004E10000-0x0000000004E11000-memory.dmp

Filesize
4KB

Download
memory/640-122-0x00000000061B0000-0x00000000061B1000-memory.dmp

Filesize
4KB

Download
memory/640-123-0x00000000060C0000-0x00000000060C1000-memory.dmp

Filesize
4KB

Download
memory/640-124-0x0000000004BF0000-0x00000000050EE000-memory.dmp

Filesize
5.0MB

Download
memory/640-125-0x00000000064D0000-0x00000000064DB000-memory.dmp

Filesize
44KB

Download
memory/640-126-0x0000000009260000-0x0000000009261000-memory.dmp

Filesize
4KB

Download
memory/640-116-0x00000000050F0000-0x00000000050F1000-memory.dmp

Filesize
4KB

Download
memory/640-119-0x0000000004BF0000-0x00000000050EE000-memory.dmp

Filesize
5.0MB

Download
memory/640-114-0x0000000000380000-0x0000000000381000-memory.dmp

Filesize
4KB

Download
memory/640-117-0x0000000004CD0000-0x0000000004CD1000-memory.dmp

Filesize
4KB

Download
memory/1340-128-0x000000000042EEEF-mapping.dmp

Download
memory/1340-135-0x0000000000400000-0x0000000000478000-memory.dmp

Filesize
480KB

Download
memory/1340-127-0x0000000000400000-0x0000000000478000-memory.dmp

Filesize
480KB

Download
memory/2120-132-0x0000000000000000-mapping.dmp

Download
memory/2204-139-0x0000000000000000-mapping.dmp

Download
memory/3760-138-0x0000000000000000-mapping.dmp

Download
memory/3896-134-0x0000000000000000-mapping.dmp

Download
memory/3984-136-0x0000000000000000-mapping.dmp

Download

Analysis

Sharing

General

Malware Config

Extracted

Signatures

Processes

Network

MITRE ATT&CK Matrix ATT&CK v6

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