dcrat | 4689a7fee8a2d671659d2f8c68d9bd8d1d734867654abb88f059defc5beb9b63

General

Target

file.exe
Size

1.9MB
MD5

ffae9d3dd55cdb9bb47aa553d05d458b
SHA1

e43439834646330d3f3dc1f142acead1e7ac6f24
SHA256

4689a7fee8a2d671659d2f8c68d9bd8d1d734867654abb88f059defc5beb9b63
SHA512

e88a375b4680889befb88f66c50084af7908a6377302d3cc4eb9504808b9b5567ea6a1cadf1f607c6fdb08a94b88d2b8eb33a50f92854475130c8333d51a100e
SSDEEP

49152:ubA3jqYHNVf0jxYiwmy+FsT2vB+098DeDt7:ubrSfwGiwH+UYBt9bt7

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 5 IoCs

Detects payload of DCRat, commonly dropped by NSIS installers.

rat

Processes:

resource	yara_rule
\Users\Admin\AppData\Local\Temp\Fontwin\svchost.exe	dcrat
\Users\Admin\AppData\Local\Temp\Fontwin\svchost.exe	dcrat
C:\Users\Admin\AppData\Local\Temp\Fontwin\svchost.exe	dcrat
C:\Users\Admin\AppData\Local\Temp\Fontwin\svchost.exe	dcrat
behavioral1/memory/1536-72-0x0000000000A00000-0x0000000000BAA000-memory.dmp	dcrat

Executes dropped EXE 1 IoCs

Processes:

svchost.exe

pid process

1536 svchost.exe
Loads dropped DLL 2 IoCs

Processes:

cmd.exe

pid process

1140 cmd.exe
1140 cmd.exe
Enumerates physical storage devices 1 TTPs
Attempts to interact with connected storage/optical drive(s). Likely ransomware behaviour.

System Information Discovery
T1082
Suspicious use of AdjustPrivilegeToken 1 IoCs

Processes:

svchost.exe

description pid process

Token: SeDebugPrivilege 1536 svchost.exe

pid	process
1536	svchost.exe

pid	process
1140	cmd.exe
1140	cmd.exe

description	pid	process
Token: SeDebugPrivilege	1536	svchost.exe

Suspicious use of WriteProcessMemory 16 IoCs

Processes:

file.exeWScript.execmd.exe

description	pid	process	target process
PID 1756 wrote to memory of 1900	1756	file.exe	WScript.exe
PID 1756 wrote to memory of 1900	1756	file.exe	WScript.exe
PID 1756 wrote to memory of 1900	1756	file.exe	WScript.exe
PID 1756 wrote to memory of 1900	1756	file.exe	WScript.exe
PID 1756 wrote to memory of 680	1756	file.exe	WScript.exe
PID 1756 wrote to memory of 680	1756	file.exe	WScript.exe
PID 1756 wrote to memory of 680	1756	file.exe	WScript.exe
PID 1756 wrote to memory of 680	1756	file.exe	WScript.exe
PID 1900 wrote to memory of 1140	1900	WScript.exe	cmd.exe
PID 1900 wrote to memory of 1140	1900	WScript.exe	cmd.exe
PID 1900 wrote to memory of 1140	1900	WScript.exe	cmd.exe
PID 1900 wrote to memory of 1140	1900	WScript.exe	cmd.exe
PID 1140 wrote to memory of 1536	1140	cmd.exe	svchost.exe
PID 1140 wrote to memory of 1536	1140	cmd.exe	svchost.exe
PID 1140 wrote to memory of 1536	1140	cmd.exe	svchost.exe
PID 1140 wrote to memory of 1536	1140	cmd.exe	svchost.exe

C:\Users\Admin\AppData\Local\Temp\file.exe
"C:\Users\Admin\AppData\Local\Temp\file.exe"
1⤵
- Suspicious use of WriteProcessMemory
PID:1756

C:\Windows\SysWOW64\WScript.exe
"C:\Windows\System32\WScript.exe" "C:\Users\Admin\AppData\Local\Temp\Fontwin\A5pg7.vbe"
2⤵
- Suspicious use of WriteProcessMemory
PID:1900

C:\Windows\SysWOW64\cmd.exe
cmd /c ""C:\Users\Admin\AppData\Local\Temp\Fontwin\lcJgodXq4rO.bat" "
3⤵
- Loads dropped DLL
- Suspicious use of WriteProcessMemory
PID:1140

C:\Users\Admin\AppData\Local\Temp\Fontwin\svchost.exe
"C:\Users\Admin\AppData\Local\Temp\Fontwin\svchost.exe"
4⤵
- Executes dropped EXE
- Suspicious use of AdjustPrivilegeToken
PID:1536

C:\Windows\SysWOW64\WScript.exe
"C:\Windows\System32\WScript.exe" "C:\Users\Admin\AppData\Local\Temp\Fontwin\file.vbs"
2⤵
PID:680

MITRE ATT&CK Matrix ATT&CK v6

Initial Access

Execution

Persistence

Privilege Escalation

Defense Evasion

Credential Access

Discovery

System Information Discovery

1

T1082

Lateral Movement

Collection

Exfiltration

Command and Control

Impact

Replay Monitor

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Downloads

C:\Users\Admin\AppData\Local\Temp\Fontwin\A5pg7.vbe
Filesize
199B

MD5
d20ee83ba327ad6f773016820e223b8e

SHA1
cba80bf5f728f4a2e942c567dbf704e77c8a8e5e

SHA256
ee8df87d26c7a650d23630a339d8c5fd3d30c3edbcfd757f1bbcd588c1e14d53

SHA512
e17ff3c81c2af5bd30537419b5288872cb10ac93f179cf0cd4333628b8c756e840f54f9383ab2b540c3fa491b8a40a434cc9803442dabfc2655211cab23f3a60

Download Submit
C:\Users\Admin\AppData\Local\Temp\Fontwin\file.vbs
Filesize
34B

MD5
677cc4360477c72cb0ce00406a949c61

SHA1
b679e8c3427f6c5fc47c8ac46cd0e56c9424de05

SHA256
f1cccb5ae4aa51d293bd3c7d2a1a04cb7847d22c5db8e05ac64e9a6d7455aa0b

SHA512
7cfe2cc92f9e659f0a15a295624d611b3363bd01eb5bcf9bc7681ea9b70b0564d192d570d294657c8dc2c93497fa3b4526c975a9bf35d69617c31d9936573c6a

Download Submit
C:\Users\Admin\AppData\Local\Temp\Fontwin\lcJgodXq4rO.bat
Filesize
28B

MD5
53529a1d50b9ab9d67c700e57e2aa1b1

SHA1
3bc9026745ee38552d3cc5f37b6cfdc5c6306368

SHA256
490f184d7adffb16420be10ba5aa0b17dc0b81c1c57d9da5e949eb1bdc2845ea

SHA512
7f8cd5a7b4f154d6f6bfdfd8f575a8979c722181782962c2e781a17cde9ce56a9d481f208a59fe4e6b2f7fc1adc4efbfba2e6f31757173c1ef6a7fab9b528201

Download Submit
C:\Users\Admin\AppData\Local\Temp\Fontwin\svchost.exe
Filesize
1.6MB

MD5
c6349132a9523e079ef707292430b039

SHA1
e1a65a06120b2d875d879aecbc9154cce2f93dc9

SHA256
3540f44678e05db9c3c341e326a3c92ca20efb890755166934428c47b3faeeed

SHA512
79db000bec4caa9bc210756566414d31dfe505591ddb8b4ad5568ab2a03d51b3ca542e957d46a56d420c8a7901bbeb829b22604e4e24a158ff463de066928a2a

Download Submit
C:\Users\Admin\AppData\Local\Temp\Fontwin\svchost.exe
Filesize
1.6MB

MD5
c6349132a9523e079ef707292430b039

SHA1
e1a65a06120b2d875d879aecbc9154cce2f93dc9

SHA256
3540f44678e05db9c3c341e326a3c92ca20efb890755166934428c47b3faeeed

SHA512
79db000bec4caa9bc210756566414d31dfe505591ddb8b4ad5568ab2a03d51b3ca542e957d46a56d420c8a7901bbeb829b22604e4e24a158ff463de066928a2a

Download Submit
\Users\Admin\AppData\Local\Temp\Fontwin\svchost.exe
Filesize
1.6MB

MD5
c6349132a9523e079ef707292430b039

SHA1
e1a65a06120b2d875d879aecbc9154cce2f93dc9

SHA256
3540f44678e05db9c3c341e326a3c92ca20efb890755166934428c47b3faeeed

SHA512
79db000bec4caa9bc210756566414d31dfe505591ddb8b4ad5568ab2a03d51b3ca542e957d46a56d420c8a7901bbeb829b22604e4e24a158ff463de066928a2a

Download Submit
\Users\Admin\AppData\Local\Temp\Fontwin\svchost.exe
Filesize
1.6MB

MD5
c6349132a9523e079ef707292430b039

SHA1
e1a65a06120b2d875d879aecbc9154cce2f93dc9

SHA256
3540f44678e05db9c3c341e326a3c92ca20efb890755166934428c47b3faeeed

SHA512
79db000bec4caa9bc210756566414d31dfe505591ddb8b4ad5568ab2a03d51b3ca542e957d46a56d420c8a7901bbeb829b22604e4e24a158ff463de066928a2a

Download Submit
memory/1536-72-0x0000000000A00000-0x0000000000BAA000-memory.dmp

Filesize
1.7MB

Download
memory/1536-73-0x000000001AD30000-0x000000001ADB0000-memory.dmp

Filesize
512KB

Download
memory/1536-74-0x00000000004E0000-0x00000000004EE000-memory.dmp

Filesize
56KB

Download

Analysis

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