dcrat | c01b4811306e46eb5b8bd85e25a5d6c9fdf508983855278e2ad905bcbd4a052d

General

Target

c01b4811306e46eb5b8bd85e25a5d6c9fdf508983855278e2ad905bcbd4a052d.exe
Size

627KB
MD5

fc938e39c9d9e09ef95d04b7529ff7cf
SHA1

c726cefba588cea3135ba7bb47228676d68ce51a
SHA256

c01b4811306e46eb5b8bd85e25a5d6c9fdf508983855278e2ad905bcbd4a052d
SHA512

0afe99956bc923ccfef67e7e9a854a0f601fc53cfdcbd29964ee2d6f21e33a88f0fa43fbac13c24b25abc433abccb8e54ddab73a460596fb165190f5550915db
SSDEEP

12288:aRZ+IoG/n9IQxW3OBsee2X+t4RbdnNE5XM/j7DFJvAmLRFQ5S/RW:U2G/nvxW3Ww0tdnNKMnffLRuiY

Score

10^/10

dcrat infostealer rat

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

resource	yara_rule
behavioral2/files/0x0006000000022e69-137.dat	dcrat
behavioral2/files/0x0006000000022e69-138.dat	dcrat
behavioral2/memory/4560-139-0x0000000000230000-0x0000000000286000-memory.dmp	dcrat

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-1-5-21-2295526160-1155304984-640977766-1000\Control Panel\International\Geo\Nation	c01b4811306e46eb5b8bd85e25a5d6c9fdf508983855278e2ad905bcbd4a052d.exe
Key value queried	\REGISTRY\USER\S-1-5-21-2295526160-1155304984-640977766-1000\Control Panel\International\Geo\Nation	WScript.exe

Executes dropped EXE 1 IoCs

pid	Process
4560	comserverweb.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

description	ioc	Process
Key created	\REGISTRY\USER\S-1-5-21-2295526160-1155304984-640977766-1000_Classes\Local Settings	c01b4811306e46eb5b8bd85e25a5d6c9fdf508983855278e2ad905bcbd4a052d.exe

Suspicious behavior: EnumeratesProcesses 1 IoCs

pid	Process
4560	comserverweb.exe

Suspicious use of AdjustPrivilegeToken 1 IoCs

description	pid	Process
Token: SeDebugPrivilege	4560	comserverweb.exe

Suspicious use of WriteProcessMemory 8 IoCs

description	pid	Process	procid_target
PID 2796 wrote to memory of 3708	2796	c01b4811306e46eb5b8bd85e25a5d6c9fdf508983855278e2ad905bcbd4a052d.exe	82
PID 2796 wrote to memory of 3708	2796	c01b4811306e46eb5b8bd85e25a5d6c9fdf508983855278e2ad905bcbd4a052d.exe	82
PID 2796 wrote to memory of 3708	2796	c01b4811306e46eb5b8bd85e25a5d6c9fdf508983855278e2ad905bcbd4a052d.exe	82
PID 3708 wrote to memory of 4816	3708	WScript.exe	83
PID 3708 wrote to memory of 4816	3708	WScript.exe	83
PID 3708 wrote to memory of 4816	3708	WScript.exe	83
PID 4816 wrote to memory of 4560	4816	cmd.exe	85
PID 4816 wrote to memory of 4560	4816	cmd.exe	85

C:\Users\Admin\AppData\Local\Temp\c01b4811306e46eb5b8bd85e25a5d6c9fdf508983855278e2ad905bcbd4a052d.exe
"C:\Users\Admin\AppData\Local\Temp\c01b4811306e46eb5b8bd85e25a5d6c9fdf508983855278e2ad905bcbd4a052d.exe"
1⤵
- Checks computer location settings
- Modifies registry class
- Suspicious use of WriteProcessMemory
PID:2796
- C:\Windows\SysWOW64\WScript.exe
  "C:\Windows\System32\WScript.exe" "C:\Users\Admin\AppData\Roaming\comagentcrt\MindHbkMsqJtnggHhLqJYVFdJogj.vbe"
  2⤵
  - Checks computer location settings
  - Suspicious use of WriteProcessMemory
  PID:3708
- - C:\Windows\SysWOW64\cmd.exe
    C:\Windows\system32\cmd.exe /c ""C:\Users\Admin\AppData\Roaming\comagentcrt\0y48fJbU8ZJyCFlP01qjkan2bHzNa9.bat" "
    3⤵
    - Suspicious use of WriteProcessMemory
    PID:4816
  - - C:\Users\Admin\AppData\Roaming\comagentcrt\comserverweb.exe
      "C:\Users\Admin\AppData\Roaming\comagentcrt\comserverweb.exe"
      4⤵
      Executes dropped EXE
      Suspicious behavior: EnumeratesProcesses
      Suspicious use of AdjustPrivilegeToken
      PID:4560

Network

MITRE ATT&CK Enterprise v6

Initial Access

Execution

Persistence

Privilege Escalation

Defense Evasion

Credential Access

Discovery

Query Registry

1

T1012

System Information Discovery

2

T1082

Lateral Movement

Collection

Command and Control

Exfiltration

Impact

Replay Monitor

Loading Replay Monitor...

Downloads

C:\Users\Admin\AppData\Roaming\comagentcrt\0y48fJbU8ZJyCFlP01qjkan2bHzNa9.bat

Filesize
40B

MD5
fa71a847d3db65d16448b0f39dfd3946

SHA1
dd692c33c6a9c3430da37287db449d6c2c78d3af

SHA256
11698cca37e79638da4080a130849756ce731cbc84ecbbbf0688f163a4c7976a

SHA512
6920c7cd9ec449279619b87daa1014c07da36ef2eabdf144fee2ad5788caf2573bd520321e82ad09ad9f1da72959b4ff1ab3f5598b1104093b60b41c5a742680

Download Submit
C:\Users\Admin\AppData\Roaming\comagentcrt\MindHbkMsqJtnggHhLqJYVFdJogj.vbe

Filesize
225B

MD5
40917542795e430f04c790b856695465

SHA1
5bd7bcf32175ff2532f4ae80e7f0fc9b6ebff8ab

SHA256
742d5d5790437a511822599e975215723bcedc56f88884c704b9ca35a26ce46b

SHA512
f2e13438d7027fb4c15891ea110fd9cfb15e238e5d6d5b6b6e8a06d65342f33eaff3a48187df15dde2752d30634e1aa687302e5cc45e61527b633fc43310256b

Download Submit
C:\Users\Admin\AppData\Roaming\comagentcrt\comserverweb.exe

Filesize
317KB

MD5
61ee39f5537e65720ec629a593809c02

SHA1
a3ce1a9970fdb69c5f4bde0ffa49ca4cbd0c69bd

SHA256
8bed0227175fdad5e7f3c17003af481764230711f774b10af6b55d1ab58b25ec

SHA512
2e3c1ae897060820b0d5734c2c74740c22f4d45426fd51917a37cef652917ad12efdda7f3f9352e983f6f029a0d739317630928b82f247d1bbb00685ce97f284

Download Submit
C:\Users\Admin\AppData\Roaming\comagentcrt\comserverweb.exe

Filesize
317KB

MD5
61ee39f5537e65720ec629a593809c02

SHA1
a3ce1a9970fdb69c5f4bde0ffa49ca4cbd0c69bd

SHA256
8bed0227175fdad5e7f3c17003af481764230711f774b10af6b55d1ab58b25ec

SHA512
2e3c1ae897060820b0d5734c2c74740c22f4d45426fd51917a37cef652917ad12efdda7f3f9352e983f6f029a0d739317630928b82f247d1bbb00685ce97f284

Download Submit
memory/4560-139-0x0000000000230000-0x0000000000286000-memory.dmp

Filesize
344KB

Download
memory/4560-140-0x00007FFAA2B40000-0x00007FFAA3601000-memory.dmp

Filesize
10.8MB

Download
memory/4560-141-0x00007FFAA2B40000-0x00007FFAA3601000-memory.dmp

Filesize
10.8MB

Download
memory/4560-142-0x00007FFAA2B40000-0x00007FFAA3601000-memory.dmp

Filesize
10.8MB

Download

Analysis

Sharing