dcrat | ef0ae9f94fe4bee89cbc48896b03e8040bead8789039f434151caa8df01b6d52

General

Target
DCRatBuild╨╝╤ë╨╣.exe
Size 1.1MB
Sample240714-rtjrhawfqa
SHA256 ef0ae9f94fe4bee89cbc48896b03e8040bead8789039f434151caa8df01b6d52
MD5 baa98be8c9eadea500c27b1067046aab
SHA1 bbc5d68213c6693871c4759e0c3790de367a1ae5
SHA512 cb4d93f85c0a96fc6657c87d20067380d8c732c7ffbb1aa7076ec36214570b9d6c3c32a6490faa97223c661051ae8d15b003f0e35aabb8190cb3413a5a8c0fdd
SSDEEP 24576:U2G/nvxW3Ww0tqUIElndz0cCYenFF1hbTpzlj:UbA30qM4meFF/H
MD5 SHA1 SHA512 SSDEEP

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 24 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	4820	4940	schtasks.exe	88
Parent C:\Windows\system32\wbem\wmiprvse.exe is not expected to spawn this process	924	4940	schtasks.exe	88
Parent C:\Windows\system32\wbem\wmiprvse.exe is not expected to spawn this process	4480	4940	schtasks.exe	88
Parent C:\Windows\system32\wbem\wmiprvse.exe is not expected to spawn this process	1456	4940	schtasks.exe	88
Parent C:\Windows\system32\wbem\wmiprvse.exe is not expected to spawn this process	5052	4940	schtasks.exe	88
Parent C:\Windows\system32\wbem\wmiprvse.exe is not expected to spawn this process	1372	4940	schtasks.exe	88
Parent C:\Windows\system32\wbem\wmiprvse.exe is not expected to spawn this process	1652	4940	schtasks.exe	88
Parent C:\Windows\system32\wbem\wmiprvse.exe is not expected to spawn this process	3232	4940	schtasks.exe	88
Parent C:\Windows\system32\wbem\wmiprvse.exe is not expected to spawn this process	4992	4940	schtasks.exe	88
Parent C:\Windows\system32\wbem\wmiprvse.exe is not expected to spawn this process	2120	4940	schtasks.exe	88
Parent C:\Windows\system32\wbem\wmiprvse.exe is not expected to spawn this process	416	4940	schtasks.exe	88
Parent C:\Windows\system32\wbem\wmiprvse.exe is not expected to spawn this process	1400	4940	schtasks.exe	88
Parent C:\Windows\system32\wbem\wmiprvse.exe is not expected to spawn this process	4752	4940	schtasks.exe	88
Parent C:\Windows\system32\wbem\wmiprvse.exe is not expected to spawn this process	4416	4940	schtasks.exe	88
Parent C:\Windows\system32\wbem\wmiprvse.exe is not expected to spawn this process	4916	4940	schtasks.exe	88
Parent C:\Windows\system32\wbem\wmiprvse.exe is not expected to spawn this process	4548	4940	schtasks.exe	88
Parent C:\Windows\system32\wbem\wmiprvse.exe is not expected to spawn this process	3852	4940	schtasks.exe	88
Parent C:\Windows\system32\wbem\wmiprvse.exe is not expected to spawn this process	736	4940	schtasks.exe	88
Parent C:\Windows\system32\wbem\wmiprvse.exe is not expected to spawn this process	4528	4940	schtasks.exe	88
Parent C:\Windows\system32\wbem\wmiprvse.exe is not expected to spawn this process	5108	4940	schtasks.exe	88
Parent C:\Windows\system32\wbem\wmiprvse.exe is not expected to spawn this process	768	4940	schtasks.exe	88
Parent C:\Windows\system32\wbem\wmiprvse.exe is not expected to spawn this process	4280	4940	schtasks.exe	88
Parent C:\Windows\system32\wbem\wmiprvse.exe is not expected to spawn this process	2420	4940	schtasks.exe	88
Parent C:\Windows\system32\wbem\wmiprvse.exe is not expected to spawn this process	4888	4940	schtasks.exe	88

DCRat payload 2 IoCs

Detects payload of DCRat, commonly dropped by NSIS installers.

rat

resource	yara_rule
behavioral2/files/0x0007000000023490-9.dat	dcrat
behavioral2/memory/1900-13-0x0000000000ED0000-0x0000000000FA6000-memory.dmp	dcrat

Checks computer location settings 2 TTPs 3 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-1-5-21-464762018-485119342-1613148473-1000\Control Panel\International\Geo\Nation	DCRatBuild╨╝╤ë╨╣.exe
Key value queried	\REGISTRY\USER\S-1-5-21-464762018-485119342-1613148473-1000\Control Panel\International\Geo\Nation	WScript.exe
Key value queried	\REGISTRY\USER\S-1-5-21-464762018-485119342-1613148473-1000\Control Panel\International\Geo\Nation	ProviderBrowserbroker.exe

Executes dropped EXE 2 IoCs

pid	Process
1900	ProviderBrowserbroker.exe
4760	RuntimeBroker.exe

Looks up external IP address via web service 2 IoCs

Uses a legitimate IP lookup service to find the infected system's external IP.

flow	ioc
4	ipinfo.io
5	ipinfo.io

Drops file in Program Files directory 7 IoCs

description	ioc	Process
File created	C:\Program Files\Google\Chrome\Application\123.0.6312.106\MEIPreload\9e8d7a4ca61bd9	ProviderBrowserbroker.exe
File created	C:\Program Files\Crashpad\csrss.exe	ProviderBrowserbroker.exe
File opened for modification	C:\Program Files\Crashpad\csrss.exe	ProviderBrowserbroker.exe
File created	C:\Program Files\Crashpad\886983d96e3d3e	ProviderBrowserbroker.exe
File created	C:\Program Files (x86)\Windows Sidebar\Shared Gadgets\lsass.exe	ProviderBrowserbroker.exe
File created	C:\Program Files (x86)\Windows Sidebar\Shared Gadgets\6203df4a6bafc7	ProviderBrowserbroker.exe
File created	C:\Program Files\Google\Chrome\Application\123.0.6312.106\MEIPreload\RuntimeBroker.exe	ProviderBrowserbroker.exe

Drops file in Windows directory 1 IoCs

description	ioc	Process
File created	C:\Windows\CSC\RuntimeBroker.exe	ProviderBrowserbroker.exe

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

System Information Discovery
T1082

Modifies registry class 2 IoCs

description	ioc	Process
Key created	\REGISTRY\USER\S-1-5-21-464762018-485119342-1613148473-1000_Classes\CLSID\{018D5C66-4533-4307-9B53-224DE2ED1FE6}\Instance\	ProviderBrowserbroker.exe
Key created	\REGISTRY\USER\S-1-5-21-464762018-485119342-1613148473-1000_Classes\Local Settings	DCRatBuild╨╝╤ë╨╣.exe

Scheduled Task/Job: Scheduled Task 1 TTPs 24 IoCs

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

persistence execution

Scheduled Task

T1053.005

pid	Process
4548	schtasks.exe
768	schtasks.exe
4820	schtasks.exe
4480	schtasks.exe
5052	schtasks.exe
1400	schtasks.exe
4416	schtasks.exe
4916	schtasks.exe
2420	schtasks.exe
4888	schtasks.exe
1456	schtasks.exe
1372	schtasks.exe
1652	schtasks.exe
736	schtasks.exe
4528	schtasks.exe
5108	schtasks.exe
4992	schtasks.exe
2120	schtasks.exe
4280	schtasks.exe
924	schtasks.exe
3232	schtasks.exe
416	schtasks.exe
4752	schtasks.exe
3852	schtasks.exe

Suspicious behavior: EnumeratesProcesses 18 IoCs

pid	Process
1900	ProviderBrowserbroker.exe
1900	ProviderBrowserbroker.exe
1900	ProviderBrowserbroker.exe
1900	ProviderBrowserbroker.exe
1900	ProviderBrowserbroker.exe
1900	ProviderBrowserbroker.exe
1900	ProviderBrowserbroker.exe
1900	ProviderBrowserbroker.exe
1900	ProviderBrowserbroker.exe
4760	RuntimeBroker.exe
4760	RuntimeBroker.exe
4760	RuntimeBroker.exe
4760	RuntimeBroker.exe
4760	RuntimeBroker.exe
4760	RuntimeBroker.exe
4760	RuntimeBroker.exe
4760	RuntimeBroker.exe
4760	RuntimeBroker.exe

Suspicious behavior: GetForegroundWindowSpam 1 IoCs

pid	Process
4760	RuntimeBroker.exe

Suspicious use of AdjustPrivilegeToken 2 IoCs

description	pid	Process
Token: SeDebugPrivilege	1900	ProviderBrowserbroker.exe
Token: SeDebugPrivilege	4760	RuntimeBroker.exe

Suspicious use of WriteProcessMemory 10 IoCs

description	pid	Process	procid_target
PID 1216 wrote to memory of 4780	1216	DCRatBuild╨╝╤ë╨╣.exe	84
PID 1216 wrote to memory of 4780	1216	DCRatBuild╨╝╤ë╨╣.exe	84
PID 1216 wrote to memory of 4780	1216	DCRatBuild╨╝╤ë╨╣.exe	84
PID 4780 wrote to memory of 4856	4780	WScript.exe	85
PID 4780 wrote to memory of 4856	4780	WScript.exe	85
PID 4780 wrote to memory of 4856	4780	WScript.exe	85
PID 4856 wrote to memory of 1900	4856	cmd.exe	87
PID 4856 wrote to memory of 1900	4856	cmd.exe	87
PID 1900 wrote to memory of 4760	1900	ProviderBrowserbroker.exe	113
PID 1900 wrote to memory of 4760	1900	ProviderBrowserbroker.exe	113

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\DCRatBuild╨╝╤ë╨╣.exe
"C:\Users\Admin\AppData\Local\Temp\DCRatBuild╨╝╤ë╨╣.exe"
1⤵
- Checks computer location settings
- Modifies registry class
- Suspicious use of WriteProcessMemory
PID:1216
- C:\Windows\SysWOW64\WScript.exe
  "C:\Windows\System32\WScript.exe" "C:\msdriversavesrefCrt\lhZZ95I5.vbe"
  2⤵
  - Checks computer location settings
  - Suspicious use of WriteProcessMemory
  PID:4780
- - C:\Windows\SysWOW64\cmd.exe
    C:\Windows\system32\cmd.exe /c ""C:\msdriversavesrefCrt\mZ3ijdN6jidWmENYA.bat" "
    3⤵
    - Suspicious use of WriteProcessMemory
    PID:4856
  - - C:\msdriversavesrefCrt\ProviderBrowserbroker.exe
      "C:\msdriversavesrefCrt\ProviderBrowserbroker.exe"
      4⤵
      Checks computer location settings
      Executes dropped EXE
      Drops file in Program Files directory
      Drops file in Windows directory
      Modifies registry class
      Suspicious behavior: EnumeratesProcesses
      Suspicious use of AdjustPrivilegeToken
      Suspicious use of WriteProcessMemory
      PID:1900
    - - C:\Users\Admin\OneDrive\RuntimeBroker.exe
        
        "C:\Users\Admin\OneDrive\RuntimeBroker.exe"
        5⤵
        Executes dropped EXE
        Suspicious behavior: EnumeratesProcesses
        Suspicious behavior: GetForegroundWindowSpam
        Suspicious use of AdjustPrivilegeToken
        
        PID:4760

C:\Windows\system32\schtasks.exe
schtasks.exe /create /tn "csrssc" /sc MINUTE /mo 10 /tr "'C:\Program Files\Crashpad\csrss.exe'" /f
1⤵
- Process spawned unexpected child process
- Scheduled Task/Job: Scheduled Task
PID:4820

C:\Windows\system32\schtasks.exe
schtasks.exe /create /tn "csrss" /sc ONLOGON /tr "'C:\Program Files\Crashpad\csrss.exe'" /rl HIGHEST /f
1⤵
- Process spawned unexpected child process
- Scheduled Task/Job: Scheduled Task
PID:924

C:\Windows\system32\schtasks.exe
schtasks.exe /create /tn "csrssc" /sc MINUTE /mo 12 /tr "'C:\Program Files\Crashpad\csrss.exe'" /rl HIGHEST /f
1⤵
- Process spawned unexpected child process
- Scheduled Task/Job: Scheduled Task
PID:4480

C:\Windows\system32\schtasks.exe
schtasks.exe /create /tn "lsassl" /sc MINUTE /mo 9 /tr "'C:\Program Files (x86)\Windows Sidebar\Shared Gadgets\lsass.exe'" /f
1⤵
- Process spawned unexpected child process
- Scheduled Task/Job: Scheduled Task
PID:1456

C:\Windows\system32\schtasks.exe
schtasks.exe /create /tn "lsass" /sc ONLOGON /tr "'C:\Program Files (x86)\Windows Sidebar\Shared Gadgets\lsass.exe'" /rl HIGHEST /f
1⤵
- Process spawned unexpected child process
- Scheduled Task/Job: Scheduled Task
PID:5052

C:\Windows\system32\schtasks.exe
schtasks.exe /create /tn "lsassl" /sc MINUTE /mo 13 /tr "'C:\Program Files (x86)\Windows Sidebar\Shared Gadgets\lsass.exe'" /rl HIGHEST /f
1⤵
- Process spawned unexpected child process
- Scheduled Task/Job: Scheduled Task
PID:1372

C:\Windows\system32\schtasks.exe
schtasks.exe /create /tn "taskhostwt" /sc MINUTE /mo 13 /tr "'C:\Recovery\WindowsRE\taskhostw.exe'" /f
1⤵
- Process spawned unexpected child process
- Scheduled Task/Job: Scheduled Task
PID:1652

C:\Windows\system32\schtasks.exe
schtasks.exe /create /tn "taskhostw" /sc ONLOGON /tr "'C:\Recovery\WindowsRE\taskhostw.exe'" /rl HIGHEST /f
1⤵
- Process spawned unexpected child process
- Scheduled Task/Job: Scheduled Task
PID:3232

C:\Windows\system32\schtasks.exe
schtasks.exe /create /tn "taskhostwt" /sc MINUTE /mo 14 /tr "'C:\Recovery\WindowsRE\taskhostw.exe'" /rl HIGHEST /f
1⤵
- Process spawned unexpected child process
- Scheduled Task/Job: Scheduled Task
PID:4992

C:\Windows\system32\schtasks.exe
schtasks.exe /create /tn "fontdrvhostf" /sc MINUTE /mo 14 /tr "'C:\msdriversavesrefCrt\fontdrvhost.exe'" /f
1⤵
- Process spawned unexpected child process
- Scheduled Task/Job: Scheduled Task
PID:2120

C:\Windows\system32\schtasks.exe
schtasks.exe /create /tn "fontdrvhost" /sc ONLOGON /tr "'C:\msdriversavesrefCrt\fontdrvhost.exe'" /rl HIGHEST /f
1⤵
- Process spawned unexpected child process
- Scheduled Task/Job: Scheduled Task
PID:416

C:\Windows\system32\schtasks.exe
schtasks.exe /create /tn "fontdrvhostf" /sc MINUTE /mo 13 /tr "'C:\msdriversavesrefCrt\fontdrvhost.exe'" /rl HIGHEST /f
1⤵
- Process spawned unexpected child process
- Scheduled Task/Job: Scheduled Task
PID:1400

C:\Windows\system32\schtasks.exe
schtasks.exe /create /tn "RuntimeBrokerR" /sc MINUTE /mo 6 /tr "'C:\Program Files\Google\Chrome\Application\123.0.6312.106\MEIPreload\RuntimeBroker.exe'" /f
1⤵
- Process spawned unexpected child process
- Scheduled Task/Job: Scheduled Task
PID:4752

C:\Windows\system32\schtasks.exe
schtasks.exe /create /tn "RuntimeBroker" /sc ONLOGON /tr "'C:\Program Files\Google\Chrome\Application\123.0.6312.106\MEIPreload\RuntimeBroker.exe'" /rl HIGHEST /f
1⤵
- Process spawned unexpected child process
- Scheduled Task/Job: Scheduled Task
PID:4416

C:\Windows\system32\schtasks.exe
schtasks.exe /create /tn "RuntimeBrokerR" /sc MINUTE /mo 8 /tr "'C:\Program Files\Google\Chrome\Application\123.0.6312.106\MEIPreload\RuntimeBroker.exe'" /rl HIGHEST /f
1⤵
- Process spawned unexpected child process
- Scheduled Task/Job: Scheduled Task
PID:4916

C:\Windows\system32\schtasks.exe
schtasks.exe /create /tn "RuntimeBrokerR" /sc MINUTE /mo 13 /tr "'C:\Users\Admin\OneDrive\RuntimeBroker.exe'" /f
1⤵
- Process spawned unexpected child process
- Scheduled Task/Job: Scheduled Task
PID:4548

C:\Windows\system32\schtasks.exe
schtasks.exe /create /tn "RuntimeBroker" /sc ONLOGON /tr "'C:\Users\Admin\OneDrive\RuntimeBroker.exe'" /rl HIGHEST /f
1⤵
- Process spawned unexpected child process
- Scheduled Task/Job: Scheduled Task
PID:3852

C:\Windows\system32\schtasks.exe
schtasks.exe /create /tn "RuntimeBrokerR" /sc MINUTE /mo 10 /tr "'C:\Users\Admin\OneDrive\RuntimeBroker.exe'" /rl HIGHEST /f
1⤵
- Process spawned unexpected child process
- Scheduled Task/Job: Scheduled Task
PID:736

C:\Windows\system32\schtasks.exe
schtasks.exe /create /tn "RuntimeBrokerR" /sc MINUTE /mo 14 /tr "'C:\Recovery\WindowsRE\RuntimeBroker.exe'" /f
1⤵
- Process spawned unexpected child process
- Scheduled Task/Job: Scheduled Task
PID:5108

C:\Windows\system32\schtasks.exe
schtasks.exe /create /tn "RuntimeBroker" /sc ONLOGON /tr "'C:\Recovery\WindowsRE\RuntimeBroker.exe'" /rl HIGHEST /f
1⤵
- Process spawned unexpected child process
- Scheduled Task/Job: Scheduled Task
PID:4528

C:\Windows\system32\schtasks.exe
schtasks.exe /create /tn "RuntimeBrokerR" /sc MINUTE /mo 12 /tr "'C:\Recovery\WindowsRE\RuntimeBroker.exe'" /rl HIGHEST /f
1⤵
- Process spawned unexpected child process
- Scheduled Task/Job: Scheduled Task
PID:768

C:\Windows\system32\schtasks.exe
schtasks.exe /create /tn "IdleI" /sc MINUTE /mo 9 /tr "'C:\Users\Public\Pictures\Idle.exe'" /f
1⤵
- Process spawned unexpected child process
- Scheduled Task/Job: Scheduled Task
PID:2420

C:\Windows\system32\schtasks.exe
schtasks.exe /create /tn "Idle" /sc ONLOGON /tr "'C:\Users\Public\Pictures\Idle.exe'" /rl HIGHEST /f
1⤵
- Process spawned unexpected child process
- Scheduled Task/Job: Scheduled Task
PID:4280

C:\Windows\system32\schtasks.exe
schtasks.exe /create /tn "IdleI" /sc MINUTE /mo 7 /tr "'C:\Users\Public\Pictures\Idle.exe'" /rl HIGHEST /f
1⤵
- Process spawned unexpected child process
- Scheduled Task/Job: Scheduled Task
PID:4888

Network

MITRE ATT&CK Enterprise v15

Reconnaissance

Resource Development

Initial Access

Execution

Scheduled Task/Job

1

T1053

Scheduled Task

1

T1053.005

Persistence

Scheduled Task/Job

1

T1053

Scheduled Task

1

T1053.005

Privilege Escalation

Scheduled Task/Job

1

T1053

Scheduled Task

1

T1053.005

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

ProviderBrowserbroker.exe

Path C:\msdriversavesrefCrt\ProviderBrowserbroker.exe
Size 828KB
SHA256 9d364dd8e12cfaec96b41f029e348ce456bd8fb914fa7f1890ef0e7328475096
MD5 709c7119a6869d6c1a1852aa2339316b
SHA1 19ec52e6a5383f9ee84a8517ab7216abc511931f
SHA512 4b39228d36437ac91379d303c7f95e5bae6d7f3dc0e7d616aa389eb6654176c24b920d94cddf6619f333c653e231d2c4d45fd7aedaa6ca48b7f088559423f542
SSDEEP 12288:1PHEp2IEl77dzSKx9zCcCYenFzZ+WUZtSgC4eac3TvxVtl:OUIElndz0cCYenFF1hbTpzl
MD5 SHA1 SHA512 SSDEEP

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lhZZ95I5.vbe

Path C:\msdriversavesrefCrt\lhZZ95I5.vbe
Size 213B
SHA256 d59ed709429cb0767bd89838f67c88d127288547994b1c78010bf3359b94e292
MD5 60265bcdf70feaa06b2a4d656e97fbec
SHA1 69c3b68b303a2521e88e3b736dcef06086bb56d7
SHA512 f7a3787c94369c9e0467a92a250bdc6786440bb1e60edaab165b48b97a0d66566990303ab462244009c6e89beaf9142133fe98d61a3b4feb7faadfd841563b1a
MD5 SHA1 SHA512

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mZ3ijdN6jidWmENYA.bat

Path C:\msdriversavesrefCrt\mZ3ijdN6jidWmENYA.bat
Size 50B
SHA256 0a8eb55b269048e776180bb1f7f890f500157a2fa9e7a38ce2eaddc44d4e0187
MD5 62ce308233ad788a10fa5a6233c733d7
SHA1 fb1f26ef06ffa62529758ff629b9984135d8d380
SHA512 5b6288f8caa5defa542e6b309ae36b9ea5e5ce8d1a9150e33ac99a79045553e93f243a55c8e0593f6b1c8d36973903289564d699c1323619953867f9253f53c3
MD5 SHA1 SHA512

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memory/1900-12-0x00007FFE87A53000-0x00007FFE87A55000-memory.dmp

Download

memory/1900-13-0x0000000000ED0000-0x0000000000FA6000-memory.dmp

Download

Analysis

Sharing

General

Malware Config

Signatures

Processes

Network

MITRE ATT&CK Enterprise v15

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Downloads