dcrat | ae3aa6d645818c7b732fa7a70ad6bbd9b48be4f2a46ab60a9fc2169b6c8c141e

General

Target

bc77f8df8e1dcb58a4142ee74.exe
Size

828KB
MD5

bc77f8df8e1dcb58a4142ee740803de9
SHA1

c33ffa160a2d945b5c20dd0662a39ef666135e4c
SHA256

ae3aa6d645818c7b732fa7a70ad6bbd9b48be4f2a46ab60a9fc2169b6c8c141e
SHA512

e10cb92868bad8309a22b81fa421f8e8d90547800d64d594a2255238371c65c9a39ad8762960c9c4a9c85cab3db0551cd3893b62fe9bdcc0dbcd5d8b724447f5
SSDEEP

12288:YnpgQaO+4y7PlLKnE2MoY0lHUkdiKLExUbtZ2jt7:WWQaO+42PlLKnEXoY0lViKYxIMp7

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

Process spawned unexpected child process 9 IoCs

This typically indicates the parent process was compromised via an exploit or macro.

description	pid	pid_target	Process	procid_target
Parent C:\Windows\system32\wbem\wmiprvse.exe is not expected to spawn this process	1776	4692	schtasks.exe	85
Parent C:\Windows\system32\wbem\wmiprvse.exe is not expected to spawn this process	4704	4692	schtasks.exe	85
Parent C:\Windows\system32\wbem\wmiprvse.exe is not expected to spawn this process	2304	4692	schtasks.exe	85
Parent C:\Windows\system32\wbem\wmiprvse.exe is not expected to spawn this process	4384	4692	schtasks.exe	85
Parent C:\Windows\system32\wbem\wmiprvse.exe is not expected to spawn this process	4424	4692	schtasks.exe	85
Parent C:\Windows\system32\wbem\wmiprvse.exe is not expected to spawn this process	4932	4692	schtasks.exe	85
Parent C:\Windows\system32\wbem\wmiprvse.exe is not expected to spawn this process	2528	4692	schtasks.exe	85
Parent C:\Windows\system32\wbem\wmiprvse.exe is not expected to spawn this process	1680	4692	schtasks.exe	85
Parent C:\Windows\system32\wbem\wmiprvse.exe is not expected to spawn this process	4184	4692	schtasks.exe	85

DCRat payload 3 IoCs

Detects payload of DCRat, commonly dropped by NSIS installers.

rat

resource	yara_rule
behavioral2/memory/4304-133-0x0000000000210000-0x00000000002E6000-memory.dmp	dcrat
behavioral2/files/0x0007000000023113-148.dat	dcrat
behavioral2/files/0x0007000000023113-149.dat	dcrat

Checks computer location settings 2 TTPs 1 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-1-5-21-4176143399-3250363947-192774652-1000\Control Panel\International\Geo\Nation	bc77f8df8e1dcb58a4142ee74.exe

Executes dropped EXE 1 IoCs

pid	Process
956	RuntimeBroker.exe

Drops file in Windows directory 2 IoCs

description	ioc	Process
File created	C:\Windows\es-ES\RuntimeBroker.exe	bc77f8df8e1dcb58a4142ee74.exe
File created	C:\Windows\es-ES\9e8d7a4ca61bd9	bc77f8df8e1dcb58a4142ee74.exe

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

System Information Discovery
T1082

Creates scheduled task(s) 1 TTPs 9 IoCs

Schtasks is often used by malware for persistence or to perform post-infection execution.

persistence

Scheduled Task

T1053

pid	Process
2304	schtasks.exe
4424	schtasks.exe
1680	schtasks.exe
1776	schtasks.exe
4704	schtasks.exe
4384	schtasks.exe
4932	schtasks.exe
2528	schtasks.exe
4184	schtasks.exe

Modifies registry class 1 IoCs

description	ioc	Process
Key created	\REGISTRY\USER\S-1-5-21-4176143399-3250363947-192774652-1000_Classes\Local Settings	bc77f8df8e1dcb58a4142ee74.exe

Suspicious behavior: EnumeratesProcesses 4 IoCs

pid	Process
4304	bc77f8df8e1dcb58a4142ee74.exe
4304	bc77f8df8e1dcb58a4142ee74.exe
4304	bc77f8df8e1dcb58a4142ee74.exe
956	RuntimeBroker.exe

Suspicious use of AdjustPrivilegeToken 2 IoCs

description	pid	Process
Token: SeDebugPrivilege	4304	bc77f8df8e1dcb58a4142ee74.exe
Token: SeDebugPrivilege	956	RuntimeBroker.exe

Suspicious use of WriteProcessMemory 6 IoCs

description	pid	Process	procid_target
PID 4304 wrote to memory of 4876	4304	bc77f8df8e1dcb58a4142ee74.exe	95
PID 4304 wrote to memory of 4876	4304	bc77f8df8e1dcb58a4142ee74.exe	95
PID 4876 wrote to memory of 3188	4876	cmd.exe	97
PID 4876 wrote to memory of 3188	4876	cmd.exe	97
PID 4876 wrote to memory of 956	4876	cmd.exe	100
PID 4876 wrote to memory of 956	4876	cmd.exe	100

Uses Task Scheduler COM API 1 TTPs
The Task Scheduler COM API can be used to schedule applications to run on boot or at set times.
persistence

Query Registry
T1012

C:\Users\Admin\AppData\Local\Temp\bc77f8df8e1dcb58a4142ee74.exe
"C:\Users\Admin\AppData\Local\Temp\bc77f8df8e1dcb58a4142ee74.exe"
1⤵
- Checks computer location settings
- Drops file in Windows directory
- Modifies registry class
- Suspicious behavior: EnumeratesProcesses
- Suspicious use of AdjustPrivilegeToken
- Suspicious use of WriteProcessMemory
PID:4304
- C:\Windows\System32\cmd.exe
  "C:\Windows\System32\cmd.exe" /C "C:\Users\Admin\AppData\Local\Temp\Y8nE0hKGnf.bat"
  2⤵
  - Suspicious use of WriteProcessMemory
  PID:4876
- - C:\Windows\system32\w32tm.exe
    w32tm /stripchart /computer:localhost /period:5 /dataonly /samples:2
    3⤵
    PID:3188
- - C:\Windows\es-ES\RuntimeBroker.exe
    "C:\Windows\es-ES\RuntimeBroker.exe"
    3⤵
    - Executes dropped EXE
    - Suspicious behavior: EnumeratesProcesses
    - Suspicious use of AdjustPrivilegeToken
    PID:956

C:\Windows\system32\schtasks.exe
schtasks.exe /create /tn "SystemS" /sc MINUTE /mo 11 /tr "'C:\Recovery\WindowsRE\System.exe'" /f
1⤵
- Process spawned unexpected child process
- Creates scheduled task(s)
PID:1776

C:\Windows\system32\schtasks.exe
schtasks.exe /create /tn "System" /sc ONLOGON /tr "'C:\Recovery\WindowsRE\System.exe'" /rl HIGHEST /f
1⤵
- Process spawned unexpected child process
- Creates scheduled task(s)
PID:4704

C:\Windows\system32\schtasks.exe
schtasks.exe /create /tn "SystemS" /sc MINUTE /mo 6 /tr "'C:\Recovery\WindowsRE\System.exe'" /rl HIGHEST /f
1⤵
- Process spawned unexpected child process
- Creates scheduled task(s)
PID:2304

C:\Windows\system32\schtasks.exe
schtasks.exe /create /tn "RuntimeBrokerR" /sc MINUTE /mo 5 /tr "'C:\Windows\es-ES\RuntimeBroker.exe'" /f
1⤵
- Process spawned unexpected child process
- Creates scheduled task(s)
PID:4384

C:\Windows\system32\schtasks.exe
schtasks.exe /create /tn "RuntimeBroker" /sc ONLOGON /tr "'C:\Windows\es-ES\RuntimeBroker.exe'" /rl HIGHEST /f
1⤵
- Process spawned unexpected child process
- Creates scheduled task(s)
PID:4424

C:\Windows\system32\schtasks.exe
schtasks.exe /create /tn "RuntimeBrokerR" /sc MINUTE /mo 13 /tr "'C:\Windows\es-ES\RuntimeBroker.exe'" /rl HIGHEST /f
1⤵
- Process spawned unexpected child process
- Creates scheduled task(s)
PID:4932

C:\Windows\system32\schtasks.exe
schtasks.exe /create /tn "wininitw" /sc MINUTE /mo 12 /tr "'C:\Users\Public\Documents\My Music\wininit.exe'" /f
1⤵
- Process spawned unexpected child process
- Creates scheduled task(s)
PID:2528

C:\Windows\system32\schtasks.exe
schtasks.exe /create /tn "wininit" /sc ONLOGON /tr "'C:\Users\Public\Documents\My Music\wininit.exe'" /rl HIGHEST /f
1⤵
- Process spawned unexpected child process
- Creates scheduled task(s)
PID:1680

C:\Windows\system32\schtasks.exe
schtasks.exe /create /tn "wininitw" /sc MINUTE /mo 8 /tr "'C:\Users\Public\Documents\My Music\wininit.exe'" /rl HIGHEST /f
1⤵
- Process spawned unexpected child process
- Creates scheduled task(s)
PID:4184

Network

MITRE ATT&CK Enterprise v6

Initial Access

Execution

Scheduled Task

1

T1053

Persistence

Scheduled Task

1

T1053

Privilege Escalation

Scheduled Task

1

T1053

Defense Evasion

Credential Access

Discovery

Query Registry

2

T1012

System Information Discovery

2

T1082

Lateral Movement

Collection

Command and Control

Exfiltration

Impact

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Downloads

C:\Users\Admin\AppData\Local\Temp\Y8nE0hKGnf.bat

Filesize
199B

MD5
6cb45317d1cd8135887a31c601a5e0d6

SHA1
45b9c1216b40ee6e3da6d7408c188636aef296a9

SHA256
f271bd847bfc64a5a8f4b2aae7576e225b81c61aa27ba8a9b2b05d38d2e7ce93

SHA512
0b8721a103063e2ffd4abc6a368f58b345daa9bd291f94dc370d194b72b68796a734fb0321a553ecf568309bec377887c68f4ad90df32ee5188cd94f2c7759fa

Download Submit
C:\Windows\es-ES\RuntimeBroker.exe

Filesize
828KB

MD5
bc77f8df8e1dcb58a4142ee740803de9

SHA1
c33ffa160a2d945b5c20dd0662a39ef666135e4c

SHA256
ae3aa6d645818c7b732fa7a70ad6bbd9b48be4f2a46ab60a9fc2169b6c8c141e

SHA512
e10cb92868bad8309a22b81fa421f8e8d90547800d64d594a2255238371c65c9a39ad8762960c9c4a9c85cab3db0551cd3893b62fe9bdcc0dbcd5d8b724447f5

Download Submit
C:\Windows\es-ES\RuntimeBroker.exe

Filesize
828KB

MD5
bc77f8df8e1dcb58a4142ee740803de9

SHA1
c33ffa160a2d945b5c20dd0662a39ef666135e4c

SHA256
ae3aa6d645818c7b732fa7a70ad6bbd9b48be4f2a46ab60a9fc2169b6c8c141e

SHA512
e10cb92868bad8309a22b81fa421f8e8d90547800d64d594a2255238371c65c9a39ad8762960c9c4a9c85cab3db0551cd3893b62fe9bdcc0dbcd5d8b724447f5

Download Submit
memory/4304-133-0x0000000000210000-0x00000000002E6000-memory.dmp

Filesize
856KB

Download
memory/4304-134-0x0000000000990000-0x00000000009A0000-memory.dmp

Filesize
64KB

Download

Analysis

Sharing

General

Malware Config

Signatures

Processes

Network

MITRE ATT&CK Enterprise v6

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Downloads