dcrat | 90466f699fc91f2e2cc7a31699e303eb2979509361d4de47e9345456453304d7

Analysis

max time kernel
93s
max time network
112s
platform
windows10-2004_x64
resource
win10v2004-20230220-en
resource tags

arch:x64arch:x86image:win10v2004-20230220-enlocale:en-usos:windows10-2004-x64system
submitted
09-06-2023 18:54

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General

Target

comSessionMonitor.exe
Size

20.0MB
MD5

c92d0c164406653b0fb1c71a1868084c
SHA1

91123ec3168ef21028cb1f2e4dd99d569b0798f5
SHA256

90466f699fc91f2e2cc7a31699e303eb2979509361d4de47e9345456453304d7
SHA512

03e482a12f2daac406d8cd115de6c9955aedfba6fd5969c0078b661d0c4f8ce9228f88461171e4eeb7de76c0d613756f86f212db49b378bd23fe3c35f7e68915
SSDEEP

393216:t7u8d72nGlZ37wO7Nw39s2wT9Rn/lYIIkurtWNb8ziaKIT71/m0mANL7Zv:t775lVcCNw39n6F/lYSu0C0Iv1/jmiZv

Score

10^/10

dcrat evasion infostealer rat themida trojan

Malware Config

Signatures

DcRat
DarkCrystal(DC) is a new .NET RAT active since June 2019 capable of loading additional plugins.
rat infostealer dcrat

DCRat payload 3 IoCs

Detects payload of DCRat, commonly dropped by NSIS installers.

rat

Processes:

resource	yara_rule
behavioral1/memory/4816-136-0x0000000000760000-0x00000000039E6000-memory.dmp	dcrat
behavioral1/memory/4816-137-0x0000000000760000-0x00000000039E6000-memory.dmp	dcrat
behavioral1/memory/4816-146-0x0000000000760000-0x00000000039E6000-memory.dmp	dcrat

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

Query Registry
T1012

Virtualization/Sandbox Evasion
T1497

Processes:

comSessionMonitor.exe

description ioc process

Key opened \REGISTRY\MACHINE\HARDWARE\ACPI\DSDT\VBOX__ comSessionMonitor.exe

description	ioc	process
Key opened	\REGISTRY\MACHINE\HARDWARE\ACPI\DSDT\VBOX__	comSessionMonitor.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

Processes:

comSessionMonitor.exe

description	ioc	process
Key value queried	\REGISTRY\MACHINE\HARDWARE\DESCRIPTION\System\SystemBiosVersion	comSessionMonitor.exe
Key value queried	\REGISTRY\MACHINE\HARDWARE\DESCRIPTION\System\VideoBiosVersion	comSessionMonitor.exe

Themida packer 3 IoCs

Detects Themida, an advanced Windows software protection system.

themida

Processes:

resource	yara_rule
behavioral1/memory/4816-136-0x0000000000760000-0x00000000039E6000-memory.dmp	themida
behavioral1/memory/4816-137-0x0000000000760000-0x00000000039E6000-memory.dmp	themida
behavioral1/memory/4816-146-0x0000000000760000-0x00000000039E6000-memory.dmp	themida

Checks whether UAC is enabled 1 TTPs 1 IoCs
evasion trojan

System Information Discovery
T1082

Processes:

comSessionMonitor.exe

description ioc process

Key value queried \REGISTRY\MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Policies\System\EnableLUA comSessionMonitor.exe
Suspicious use of NtSetInformationThreadHideFromDebugger 1 IoCs

Processes:

comSessionMonitor.exe

pid process

4816 comSessionMonitor.exe
Suspicious use of AdjustPrivilegeToken 1 IoCs

Processes:

comSessionMonitor.exe

description pid process

Token: SeDebugPrivilege 4816 comSessionMonitor.exe

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

pid	process
4816	comSessionMonitor.exe

description	pid	process
Token: SeDebugPrivilege	4816	comSessionMonitor.exe

C:\Users\Admin\AppData\Local\Temp\comSessionMonitor.exe
"C:\Users\Admin\AppData\Local\Temp\comSessionMonitor.exe"
1⤵
- Identifies VirtualBox via ACPI registry values (likely anti-VM)
- Checks BIOS information in registry
- Checks whether UAC is enabled
- Suspicious use of NtSetInformationThreadHideFromDebugger
- Suspicious use of AdjustPrivilegeToken
PID:4816

Network

MITRE ATT&CK Matrix ATT&CK v6

Initial Access

Execution

Persistence

Privilege Escalation

Defense Evasion

Virtualization/Sandbox Evasion

T1497

Credential Access

Discovery

Query Registry

T1012

Virtualization/Sandbox Evasion

T1497

System Information Discovery

T1082

Lateral Movement

Collection

Exfiltration

Command and Control

Impact

Replay Monitor

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Downloads

memory/4816-133-0x0000000000760000-0x00000000039E6000-memory.dmp

Filesize
50.5MB

Download
memory/4816-136-0x0000000000760000-0x00000000039E6000-memory.dmp

Filesize
50.5MB

Download
memory/4816-137-0x0000000000760000-0x00000000039E6000-memory.dmp

Filesize
50.5MB

Download
memory/4816-139-0x00000000083D0000-0x00000000083E0000-memory.dmp

Filesize
64KB

Download
memory/4816-140-0x00000000090A0000-0x0000000009644000-memory.dmp

Filesize
5.6MB

Download
memory/4816-141-0x0000000008C60000-0x0000000008CC6000-memory.dmp

Filesize
408KB

Download
memory/4816-142-0x0000000000760000-0x00000000039E6000-memory.dmp

Filesize
50.5MB

Download
memory/4816-146-0x0000000000760000-0x00000000039E6000-memory.dmp

Filesize
50.5MB

Download