dcrat | da6dce99f0d0e2ee2bd88f81fec12c60df9f78c5e4ace089aacbf26b4ba9b814

Analysis

max time kernel
95s
max time network
160s
platform
windows10-2004_x64
resource
win10v2004-20240704-en
resource tags

arch:x64arch:x86image:win10v2004-20240704-enlocale:en-usos:windows10-2004-x64system
submitted
07-07-2024 07:41

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General

Target

DCRatBuild.exe
Size

1.4MB
MD5

89b087627ab2f02af042cf2e46a89427
SHA1

64fed76eee20d461abd86123f6b754cd3e810961
SHA256

da6dce99f0d0e2ee2bd88f81fec12c60df9f78c5e4ace089aacbf26b4ba9b814
SHA512

8e0f1ef2cf3c32d86a9e9485ae4dea5c3f3b3d085395b62fe969e17ae5cacdbdf6e7b0400a4a70bc96c0926fd80dfbc233bb20deeb42e3f7097aad091d4068e3
SSDEEP

24576:U2G/nvxW3Ww0t7yO5RWecKoi76yyRfX00iTCYWEre2:UbA30TYKo9XsH1

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 2 IoCs

Detects payload of DCRat, commonly dropped by NSIS installers.

rat

resource	yara_rule
behavioral2/files/0x00090000000233f0-10.dat	dcrat
behavioral2/memory/4596-13-0x0000000000080000-0x0000000000198000-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-1-5-21-2494989678-839960665-2515455429-1000\Control Panel\International\Geo\Nation	DCRatBuild.exe
Key value queried	\REGISTRY\USER\S-1-5-21-2494989678-839960665-2515455429-1000\Control Panel\International\Geo\Nation	WScript.exe

Executes dropped EXE 1 IoCs

pid	Process
4596	ChainSaves.exe

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

System Information Discovery
T1082

Modifies registry class 1 IoCs

description	ioc	Process
Key created	\REGISTRY\USER\S-1-5-21-2494989678-839960665-2515455429-1000_Classes\Local Settings	DCRatBuild.exe

Suspicious use of AdjustPrivilegeToken 1 IoCs

description	pid	Process
Token: SeDebugPrivilege	4596	ChainSaves.exe

Suspicious use of WriteProcessMemory 8 IoCs

description	pid	Process	procid_target
PID 3268 wrote to memory of 3008	3268	DCRatBuild.exe	86
PID 3268 wrote to memory of 3008	3268	DCRatBuild.exe	86
PID 3268 wrote to memory of 3008	3268	DCRatBuild.exe	86
PID 3008 wrote to memory of 3820	3008	WScript.exe	87
PID 3008 wrote to memory of 3820	3008	WScript.exe	87
PID 3008 wrote to memory of 3820	3008	WScript.exe	87
PID 3820 wrote to memory of 4596	3820	cmd.exe	89
PID 3820 wrote to memory of 4596	3820	cmd.exe	89

C:\Users\Admin\AppData\Local\Temp\DCRatBuild.exe
"C:\Users\Admin\AppData\Local\Temp\DCRatBuild.exe"
1⤵
- Checks computer location settings
- Modifies registry class
- Suspicious use of WriteProcessMemory
PID:3268
- C:\Windows\SysWOW64\WScript.exe
  "C:\Windows\System32\WScript.exe" "C:\Users\Admin\AppData\Local\Temp\browserrefCrtsvc\UoIlC.vbe"
  2⤵
  - Checks computer location settings
  - Suspicious use of WriteProcessMemory
  PID:3008
- - C:\Windows\SysWOW64\cmd.exe
    C:\Windows\system32\cmd.exe /c ""C:\Users\Admin\AppData\Local\Temp\browserrefCrtsvc\Ocb89um2.bat" "
    3⤵
    - Suspicious use of WriteProcessMemory
    PID:3820
  - - C:\Users\Admin\AppData\Local\Temp\browserrefCrtsvc\ChainSaves.exe
      "C:\Users\Admin\AppData\Local\Temp\browserrefCrtsvc\ChainSaves.exe"
      4⤵
      Executes dropped EXE
      Suspicious use of AdjustPrivilegeToken
      PID:4596

Network

MITRE ATT&CK Enterprise v15

Reconnaissance

Resource Development

Initial Access

Execution

Persistence

Privilege Escalation

Defense Evasion

Credential Access

Discovery

Query Registry

T1012

System Information Discovery

T1082

Lateral Movement

Collection

Command and Control

Exfiltration

Impact

Replay Monitor

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Downloads

C:\Users\Admin\AppData\Local\Temp\browserrefCrtsvc\ChainSaves.exe

Filesize
1.1MB

MD5
77fad603828f38244a7d64ae5cab33d6

SHA1
4851b8641dcc393b3d4ac52334d4923ad5266097

SHA256
349edabdab87088145c045a75c93dfce29bd2100f89d35bc43aa4275c2e75cc0

SHA512
15c35f3cdf15517ec3f8e36555c2ddd4525de2d099686488bbf497f22cf89995417a4903d5fc14093dd1bff281f7b20b29e4713baf1a45ce243e8642364f56de

Download Submit
C:\Users\Admin\AppData\Local\Temp\browserrefCrtsvc\Ocb89um2.bat

Filesize
40B

MD5
841307750510e536ecc5f7bcc2dc04c5

SHA1
23f78f1f5e21f8a9222245587ff1a0e7f49c1905

SHA256
3b76b5aa6ef4298fcaea871bb9b88ed5f5ecd0cda2ada2b3090a80093f1cbec3

SHA512
7fed4e9330a13730941c396ebdda4190c92cda5709c4c525f9528490ba1d76a5fa34898effa7b160ecb8d954a168e2a31ced2f534510621eea4b65386968af6b

Download Submit
C:\Users\Admin\AppData\Local\Temp\browserrefCrtsvc\UoIlC.vbe

Filesize
202B

MD5
4be8640cc76fefadffab33cde33fb973

SHA1
6c5021bd10d79a32c4d72404bcef357f3e5ee933

SHA256
74bd9cd8be0dd1a7faffb5aefa987d5bcabae9c22a7b716f611da0832fb8bf0c

SHA512
ef1c024308165e76b8d1260c7574f5c3abe35a771898d7e79abb31b6969721f4c60c41b3722b847b9b88509486101fffd215f8e754f52816b3fcdbe787e12d0b

Download Submit
memory/4596-12-0x00007FFCB2A73000-0x00007FFCB2A75000-memory.dmp

Filesize
8KB

Download
memory/4596-13-0x0000000000080000-0x0000000000198000-memory.dmp

Filesize
1.1MB

Download
memory/4596-14-0x0000000000960000-0x000000000096E000-memory.dmp

Filesize
56KB

Download