9ec43262d9fdce8ece6caa9a4c4341b82a64d72495bcc2888fb6f8094c0560f7

Analysis

max time kernel
95s
max time network
94s
platform
windows10-2004_x64
resource
win10v2004-20240802-en
resource tags

arch:x64arch:x86image:win10v2004-20240802-enlocale:en-usos:windows10-2004-x64system
submitted
27-08-2024 18:49

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General

Target

remcos_a.exe
Size

469KB
MD5

38cd9d961899ca26a5f29302fe5f8578
SHA1

f8758cc94c56600129bedc1679e104fb85214df2
SHA256

9ec43262d9fdce8ece6caa9a4c4341b82a64d72495bcc2888fb6f8094c0560f7
SHA512

dd7963c1304633d1e1894fd0bce3922a34e43ce4f7e89560664b8633e6bd44ee6354e80dc7eb4516bf1c15728b5b159711dc3727eef9ab3841f967a15ec4d070
SSDEEP

12288:Omnk7iLJbpIpiRL6I2WhSKQ9ZsfZQSzn9:2iLJbpI7I2WhQqZ7z9

Score

8^/10

discovery persistence

Malware Config

Signatures

Adds policy Run key to start application 2 TTPs 2 IoCs

persistence

Registry Run Keys / Startup Folder

T1547.001

Modify Registry

T1112

description	ioc	Process
Key created	\REGISTRY\MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Policies\Explorer\Run	remcos_a.exe
Set value (str)	\REGISTRY\MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Policies\Explorer\Run\Remcos = "\"C:\\winstart\\svchost\""	remcos_a.exe

Checks computer location settings 2 TTPs 2 IoCs

Looks up country code configured in the registry, likely geofence.

Query Registry

T1012

System Information Discovery

T1082

description	ioc	Process
Key value queried	\REGISTRY\USER\S-1-5-21-786284298-625481688-3210388970-1000\Control Panel\International\Geo\Nation	remcos_a.exe
Key value queried	\REGISTRY\USER\S-1-5-21-786284298-625481688-3210388970-1000\Control Panel\International\Geo\Nation	WScript.exe

Adds Run key to start application 2 TTPs 2 IoCs

persistence

Registry Run Keys / Startup Folder

T1547.001

Modify Registry

T1112

description	ioc	Process
Set value (str)	\REGISTRY\USER\S-1-5-21-786284298-625481688-3210388970-1000\SOFTWARE\Microsoft\Windows\CurrentVersion\Run\Remcos = "\"C:\\winstart\\svchost\""	remcos_a.exe
Set value (str)	\REGISTRY\MACHINE\SOFTWARE\WOW6432Node\Microsoft\Windows\CurrentVersion\Run\Remcos = "\"C:\\winstart\\svchost\""	remcos_a.exe

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

System Information Discovery
T1082

System Location Discovery: System Language Discovery 1 TTPs 3 IoCs

Attempt gather information about the system language of a victim in order to infer the geographical location of that host.

discovery

System Language Discovery

T1614.001

description	ioc	Process
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	remcos_a.exe
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	WScript.exe
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	cmd.exe

Modifies registry class 1 IoCs

description	ioc	Process
Key created	\REGISTRY\USER\S-1-5-21-786284298-625481688-3210388970-1000_Classes\Local Settings	remcos_a.exe

Suspicious use of WriteProcessMemory 6 IoCs

description	pid	Process	procid_target
PID 4428 wrote to memory of 2076	4428	remcos_a.exe	84
PID 4428 wrote to memory of 2076	4428	remcos_a.exe	84
PID 4428 wrote to memory of 2076	4428	remcos_a.exe	84
PID 2076 wrote to memory of 4000	2076	WScript.exe	88
PID 2076 wrote to memory of 4000	2076	WScript.exe	88
PID 2076 wrote to memory of 4000	2076	WScript.exe	88

C:\Users\Admin\AppData\Local\Temp\remcos_a.exe
"C:\Users\Admin\AppData\Local\Temp\remcos_a.exe"
1⤵
- Adds policy Run key to start application
- Checks computer location settings
- Adds Run key to start application
- System Location Discovery: System Language Discovery
- Modifies registry class
- Suspicious use of WriteProcessMemory
PID:4428
- C:\Windows\SysWOW64\WScript.exe
  "C:\Windows\System32\WScript.exe" "C:\Users\Admin\AppData\Local\Temp\install.vbs"
  2⤵
  - Checks computer location settings
  - System Location Discovery: System Language Discovery
  - Suspicious use of WriteProcessMemory
  PID:2076
- - C:\Windows\SysWOW64\cmd.exe
    "C:\Windows\System32\cmd.exe" /c "C:\winstart\svchost"
    3⤵
    - System Location Discovery: System Language Discovery
    PID:4000

Network

MITRE ATT&CK Enterprise v15

Reconnaissance

Resource Development

Initial Access

Execution

Persistence

Boot or Logon Autostart Execution

T1547

Registry Run Keys / Startup Folder

T1547.001

Privilege Escalation

Boot or Logon Autostart Execution

T1547

Registry Run Keys / Startup Folder

T1547.001

Defense Evasion

Modify Registry

T1112

Credential Access

Discovery

Query Registry

T1012

System Information Discovery

T1082

System Location Discovery

T1614

System Language Discovery

T1614.001

Lateral Movement

Collection

Command and Control

Exfiltration

Impact

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Downloads

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

Filesize
360B

MD5
88a2f09ebe2d07e23dbe996aabe0aa78

SHA1
e267897e618fac1799dce83112e39a123a1b46b5

SHA256
c3abd7ce6b5d62cbdfb04d8521bbd0496ef8270178d888990d36dd3809de95f3

SHA512
b6d1d968e3f428b52b17fcd33fd2eb814dc099d4a25470cb853904a560b9b2b07aba417e4af5e15359aa042ead8dc21bb188e6fca693d6dc24fc418028b041cc

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Analysis

Sharing

General

Malware Config

Signatures

Processes

Network

MITRE ATT&CK Enterprise v15

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Downloads