remcos | 81ff4cdf176564689293e7ac919f5319bc86919f7ac4ba9fecbe3d0db354395e

Analysis

max time kernel
119s
max time network
124s
platform
windows7_x64
resource
win7-20240903-en
resource tags

arch:x64arch:x86image:win7-20240903-enlocale:en-usos:windows7-x64system
submitted
18-09-2024 23:33

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General

Target

81ff4cdf176564689293e7ac919f5319bc86919f7ac4ba9fecbe3d0db354395e.dll
Size

3.9MB
MD5

70c812511a38e36a8ebf7020a719c90b
SHA1

d43602cae630b11667f25afc01dba76da6bce4df
SHA256

81ff4cdf176564689293e7ac919f5319bc86919f7ac4ba9fecbe3d0db354395e
SHA512

9c43de1530088957ae4f0b5eb95c2a68738844b54e24b6af4485874f72f569f500b37d3be783de171c028d4c68fa7288d492a0ba95594b5ced63354a7a296e7b
SSDEEP

98304:RB6s3sojxvXvMLeYhm0gdoD8OScRCYsgJ:Oij0gdoAOFTJ

Score

10^/10

remcos m2 discovery evasion rat themida trojan

Malware Config

Extracted

Family

remcos

Botnet

blessed.mypsx.net:4040

platicamijo.mypsx.net:4848

Attributes

audio_folder
MicRecords
audio_record_time
5
connect_delay
0
connect_interval
1
copy_file
remcos.exe
copy_folder
Remcos
delete_file
false
hide_file
false
hide_keylog_file
false
install_flag
false
keylog_crypt
false
keylog_file
logs.dat
keylog_flag
false
keylog_folder
remcos
mouse_option
false
mutex
Rmc-WBR5M4
screenshot_crypt
false
screenshot_flag
false
screenshot_folder
Screenshots
screenshot_path
%AppData%
screenshot_time
10
startup_value
Remcos
take_screenshot_option
false
take_screenshot_time
5

Signatures

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

Identifies VirtualBox via ACPI registry values (likely anti-VM) 2 TTPs 1 IoCs

evasion

Query Registry

T1012

Virtualization/Sandbox Evasion

T1497

description	ioc	Process
Key opened	\REGISTRY\MACHINE\HARDWARE\ACPI\DSDT\VBOX__	rundll32.exe

Checks BIOS information in registry 2 TTPs 2 IoCs

BIOS information is often read in order to detect sandboxing environments.

Query Registry

T1012

System Information Discovery

T1082

description	ioc	Process
Key value queried	\REGISTRY\MACHINE\HARDWARE\DESCRIPTION\System\VideoBiosVersion	rundll32.exe
Key value queried	\REGISTRY\MACHINE\HARDWARE\DESCRIPTION\System\SystemBiosVersion	rundll32.exe

Themida packer 2 IoCs

Detects Themida, an advanced Windows software protection system.

themida

resource	yara_rule
behavioral1/memory/1880-1-0x0000000074830000-0x0000000074C68000-memory.dmp	themida
behavioral1/memory/1880-3-0x0000000074830000-0x0000000074C68000-memory.dmp	themida

Checks whether UAC is enabled 1 TTPs 1 IoCs

evasion trojan

System Information Discovery

T1082

description	ioc	Process
Key value queried	\REGISTRY\MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Policies\System\EnableLUA	rundll32.exe

System Location Discovery: System Language Discovery 1 TTPs 1 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	rundll32.exe

Suspicious use of WriteProcessMemory 7 IoCs

description	pid	Process	procid_target
PID 1928 wrote to memory of 1880	1928	rundll32.exe	31
PID 1928 wrote to memory of 1880	1928	rundll32.exe	31
PID 1928 wrote to memory of 1880	1928	rundll32.exe	31
PID 1928 wrote to memory of 1880	1928	rundll32.exe	31
PID 1928 wrote to memory of 1880	1928	rundll32.exe	31
PID 1928 wrote to memory of 1880	1928	rundll32.exe	31
PID 1928 wrote to memory of 1880	1928	rundll32.exe	31

C:\Windows\system32\rundll32.exe
rundll32.exe C:\Users\Admin\AppData\Local\Temp\81ff4cdf176564689293e7ac919f5319bc86919f7ac4ba9fecbe3d0db354395e.dll,#1
1⤵
- Suspicious use of WriteProcessMemory
PID:1928
- C:\Windows\SysWOW64\rundll32.exe
  rundll32.exe C:\Users\Admin\AppData\Local\Temp\81ff4cdf176564689293e7ac919f5319bc86919f7ac4ba9fecbe3d0db354395e.dll,#1
  2⤵
  - Identifies VirtualBox via ACPI registry values (likely anti-VM)
  - Checks BIOS information in registry
  - Checks whether UAC is enabled
  - System Location Discovery: System Language Discovery
  PID:1880

Network

MITRE ATT&CK Enterprise v15

Reconnaissance

Resource Development

Initial Access

Execution

Persistence

Privilege Escalation

Defense Evasion

Virtualization/Sandbox Evasion

T1497

Credential Access

Discovery

Query Registry

T1012

System Information Discovery

T1082

System Location Discovery

T1614

System Language Discovery

T1614.001

Virtualization/Sandbox Evasion

T1497

Lateral Movement

Collection

Command and Control

Exfiltration

Impact

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Downloads

memory/1880-0-0x0000000074C70000-0x00000000750A8000-memory.dmp

Filesize
4.2MB

Download
memory/1880-1-0x0000000074830000-0x0000000074C68000-memory.dmp

Filesize
4.2MB

Download
memory/1880-2-0x0000000074C70000-0x00000000750A8000-memory.dmp

Filesize
4.2MB

Download
memory/1880-4-0x00000000748AD000-0x00000000748AE000-memory.dmp

Filesize
4KB

Download
memory/1880-3-0x0000000074830000-0x0000000074C68000-memory.dmp

Filesize
4.2MB

Download

Analysis

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General

Malware Config

Extracted

Signatures

Processes

Network

MITRE ATT&CK Enterprise v15

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Downloads