dcrat | 05b123c99c5736a62f1cfd6bc6a9335a533849fe663d875d20ece0caca82e077

General

Target

WebReview.exe
Size

828KB
MD5

deb7ba77dcf2e54fb23d1a9b0e51088d
SHA1

6468abad160c22594fc014d948963ba4a8565074
SHA256

05b123c99c5736a62f1cfd6bc6a9335a533849fe663d875d20ece0caca82e077
SHA512

18cedb50ceab47fed77100586bbb68692d82e4d3afe59815e0fb0d7c88677362756d2bcdc3003f0e6e1b2a3edff36ac450a9864d4d64ef5218612bc86e538de2
SSDEEP

12288:GKLmyuewe+aR5pDIBqIBpoAmxkPnGZKYKvwdUyBWwKoX6t:GoBuQ+I5p5qpLhu33BWwXqt

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 family
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	4036	3600	schtasks.exe	85
Parent C:\Windows\system32\wbem\wmiprvse.exe is not expected to spawn this process	1128	3600	schtasks.exe	85
Parent C:\Windows\system32\wbem\wmiprvse.exe is not expected to spawn this process	2392	3600	schtasks.exe	85
Parent C:\Windows\system32\wbem\wmiprvse.exe is not expected to spawn this process	1596	3600	schtasks.exe	85
Parent C:\Windows\system32\wbem\wmiprvse.exe is not expected to spawn this process	676	3600	schtasks.exe	85
Parent C:\Windows\system32\wbem\wmiprvse.exe is not expected to spawn this process	2808	3600	schtasks.exe	85
Parent C:\Windows\system32\wbem\wmiprvse.exe is not expected to spawn this process	3536	3600	schtasks.exe	85
Parent C:\Windows\system32\wbem\wmiprvse.exe is not expected to spawn this process	1144	3600	schtasks.exe	85
Parent C:\Windows\system32\wbem\wmiprvse.exe is not expected to spawn this process	4916	3600	schtasks.exe	85
Parent C:\Windows\system32\wbem\wmiprvse.exe is not expected to spawn this process	2252	3600	schtasks.exe	85
Parent C:\Windows\system32\wbem\wmiprvse.exe is not expected to spawn this process	1188	3600	schtasks.exe	85
Parent C:\Windows\system32\wbem\wmiprvse.exe is not expected to spawn this process	3696	3600	schtasks.exe	85
Parent C:\Windows\system32\wbem\wmiprvse.exe is not expected to spawn this process	4456	3600	schtasks.exe	85
Parent C:\Windows\system32\wbem\wmiprvse.exe is not expected to spawn this process	4188	3600	schtasks.exe	85
Parent C:\Windows\system32\wbem\wmiprvse.exe is not expected to spawn this process	3796	3600	schtasks.exe	85
Parent C:\Windows\system32\wbem\wmiprvse.exe is not expected to spawn this process	1156	3600	schtasks.exe	85
Parent C:\Windows\system32\wbem\wmiprvse.exe is not expected to spawn this process	3228	3600	schtasks.exe	85
Parent C:\Windows\system32\wbem\wmiprvse.exe is not expected to spawn this process	1728	3600	schtasks.exe	85
Parent C:\Windows\system32\wbem\wmiprvse.exe is not expected to spawn this process	4168	3600	schtasks.exe	85
Parent C:\Windows\system32\wbem\wmiprvse.exe is not expected to spawn this process	2376	3600	schtasks.exe	85
Parent C:\Windows\system32\wbem\wmiprvse.exe is not expected to spawn this process	3256	3600	schtasks.exe	85
Parent C:\Windows\system32\wbem\wmiprvse.exe is not expected to spawn this process	3312	3600	schtasks.exe	85
Parent C:\Windows\system32\wbem\wmiprvse.exe is not expected to spawn this process	4780	3600	schtasks.exe	85
Parent C:\Windows\system32\wbem\wmiprvse.exe is not expected to spawn this process	4796	3600	schtasks.exe	85

DCRat payload 2 IoCs

Detects payload of DCRat, commonly dropped by NSIS installers.

rat

resource	yara_rule
behavioral2/memory/3472-1-0x0000000000CE0000-0x0000000000DB6000-memory.dmp	dcrat
behavioral2/files/0x000a000000023b9c-11.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-1-5-21-1045960512-3948844814-3059691613-1000\Control Panel\International\Geo\Nation	WebReview.exe

Executes dropped EXE 1 IoCs

pid	Process
1012	sysmon.exe

Drops file in Program Files directory 12 IoCs

description	ioc	Process
File created	C:\Program Files\Windows Photo Viewer\66fc9ff0ee96c2	WebReview.exe
File created	C:\Program Files\MSBuild\Microsoft\Windows Workflow Foundation\v3.0\sysmon.exe	WebReview.exe
File created	C:\Program Files (x86)\Mozilla Maintenance Service\logs\9e8d7a4ca61bd9	WebReview.exe
File created	C:\Program Files\Google\27d1bcfc3c54e0	WebReview.exe
File created	C:\Program Files\Windows Photo Viewer\sihost.exe	WebReview.exe
File created	C:\Program Files\Google\System.exe	WebReview.exe
File created	C:\Program Files\MSBuild\Microsoft\Windows Workflow Foundation\v3.0\121e5b5079f7c0	WebReview.exe
File created	C:\Program Files\Google\Chrome\Application\123.0.6312.123\fontdrvhost.exe	WebReview.exe
File created	C:\Program Files\Google\Chrome\Application\123.0.6312.123\5b884080fd4f94	WebReview.exe
File created	C:\Program Files (x86)\WindowsPowerShell\sihost.exe	WebReview.exe
File created	C:\Program Files (x86)\WindowsPowerShell\66fc9ff0ee96c2	WebReview.exe
File created	C:\Program Files (x86)\Mozilla Maintenance Service\logs\RuntimeBroker.exe	WebReview.exe

Drops file in Windows directory 2 IoCs

description	ioc	Process
File created	C:\Windows\security\SppExtComObj.exe	WebReview.exe
File created	C:\Windows\security\e1ef82546f0b02	WebReview.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-1-5-21-1045960512-3948844814-3059691613-1000_Classes\Local Settings	WebReview.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
4456	schtasks.exe
4168	schtasks.exe
4916	schtasks.exe
3696	schtasks.exe
2376	schtasks.exe
4036	schtasks.exe
1596	schtasks.exe
3796	schtasks.exe
1156	schtasks.exe
3228	schtasks.exe
4796	schtasks.exe
3536	schtasks.exe
1188	schtasks.exe
676	schtasks.exe
2808	schtasks.exe
1144	schtasks.exe
2252	schtasks.exe
4188	schtasks.exe
1728	schtasks.exe
1128	schtasks.exe
2392	schtasks.exe
4780	schtasks.exe
3256	schtasks.exe
3312	schtasks.exe

Suspicious behavior: EnumeratesProcesses 14 IoCs

pid	Process
3472	WebReview.exe
3472	WebReview.exe
3472	WebReview.exe
3472	WebReview.exe
3472	WebReview.exe
1012	sysmon.exe
1012	sysmon.exe
1012	sysmon.exe
1012	sysmon.exe
1012	sysmon.exe
1012	sysmon.exe
1012	sysmon.exe
1012	sysmon.exe
1012	sysmon.exe

Suspicious behavior: GetForegroundWindowSpam 1 IoCs

pid	Process
1012	sysmon.exe

Suspicious use of AdjustPrivilegeToken 2 IoCs

description	pid	Process
Token: SeDebugPrivilege	3472	WebReview.exe
Token: SeDebugPrivilege	1012	sysmon.exe

Suspicious use of WriteProcessMemory 6 IoCs

description	pid	Process	procid_target
PID 3472 wrote to memory of 764	3472	WebReview.exe	110
PID 3472 wrote to memory of 764	3472	WebReview.exe	110
PID 764 wrote to memory of 1952	764	cmd.exe	112
PID 764 wrote to memory of 1952	764	cmd.exe	112
PID 764 wrote to memory of 1012	764	cmd.exe	114
PID 764 wrote to memory of 1012	764	cmd.exe	114

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\WebReview.exe
"C:\Users\Admin\AppData\Local\Temp\WebReview.exe"
1⤵
- Checks computer location settings
- 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:3472
- C:\Windows\System32\cmd.exe
  "C:\Windows\System32\cmd.exe" /C "C:\Users\Admin\AppData\Local\Temp\2e6Xr0hkJU.bat"
  2⤵
  - Suspicious use of WriteProcessMemory
  PID:764
- - C:\Windows\system32\w32tm.exe
    w32tm /stripchart /computer:localhost /period:5 /dataonly /samples:2
    3⤵
    PID:1952
- - C:\Program Files\MSBuild\Microsoft\Windows Workflow Foundation\v3.0\sysmon.exe
    "C:\Program Files\MSBuild\Microsoft\Windows Workflow Foundation\v3.0\sysmon.exe"
    3⤵
    - Executes dropped EXE
    - Suspicious behavior: EnumeratesProcesses
    - Suspicious behavior: GetForegroundWindowSpam
    - Suspicious use of AdjustPrivilegeToken
    PID:1012

C:\Windows\system32\schtasks.exe
schtasks.exe /create /tn "spoolsvs" /sc MINUTE /mo 10 /tr "'C:\Recovery\WindowsRE\spoolsv.exe'" /f
1⤵
- Process spawned unexpected child process
- Scheduled Task/Job: Scheduled Task
PID:4036

C:\Windows\system32\schtasks.exe
schtasks.exe /create /tn "spoolsv" /sc ONLOGON /tr "'C:\Recovery\WindowsRE\spoolsv.exe'" /rl HIGHEST /f
1⤵
- Process spawned unexpected child process
- Scheduled Task/Job: Scheduled Task
PID:1128

C:\Windows\system32\schtasks.exe
schtasks.exe /create /tn "spoolsvs" /sc MINUTE /mo 10 /tr "'C:\Recovery\WindowsRE\spoolsv.exe'" /rl HIGHEST /f
1⤵
- Process spawned unexpected child process
- Scheduled Task/Job: Scheduled Task
PID:2392

C:\Windows\system32\schtasks.exe
schtasks.exe /create /tn "sihosts" /sc MINUTE /mo 11 /tr "'C:\Program Files (x86)\WindowsPowerShell\sihost.exe'" /f
1⤵
- Process spawned unexpected child process
- Scheduled Task/Job: Scheduled Task
PID:1596

C:\Windows\system32\schtasks.exe
schtasks.exe /create /tn "sihost" /sc ONLOGON /tr "'C:\Program Files (x86)\WindowsPowerShell\sihost.exe'" /rl HIGHEST /f
1⤵
- Process spawned unexpected child process
- Scheduled Task/Job: Scheduled Task
PID:676

C:\Windows\system32\schtasks.exe
schtasks.exe /create /tn "sihosts" /sc MINUTE /mo 5 /tr "'C:\Program Files (x86)\WindowsPowerShell\sihost.exe'" /rl HIGHEST /f
1⤵
- Process spawned unexpected child process
- Scheduled Task/Job: Scheduled Task
PID:2808

C:\Windows\system32\schtasks.exe
schtasks.exe /create /tn "RuntimeBrokerR" /sc MINUTE /mo 12 /tr "'C:\Program Files (x86)\Mozilla Maintenance Service\logs\RuntimeBroker.exe'" /f
1⤵
- Process spawned unexpected child process
- Scheduled Task/Job: Scheduled Task
PID:3536

C:\Windows\system32\schtasks.exe
schtasks.exe /create /tn "RuntimeBroker" /sc ONLOGON /tr "'C:\Program Files (x86)\Mozilla Maintenance Service\logs\RuntimeBroker.exe'" /rl HIGHEST /f
1⤵
- Process spawned unexpected child process
- Scheduled Task/Job: Scheduled Task
PID:1144

C:\Windows\system32\schtasks.exe
schtasks.exe /create /tn "RuntimeBrokerR" /sc MINUTE /mo 8 /tr "'C:\Program Files (x86)\Mozilla Maintenance Service\logs\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 "SppExtComObjS" /sc MINUTE /mo 14 /tr "'C:\Windows\security\SppExtComObj.exe'" /f
1⤵
- Process spawned unexpected child process
- Scheduled Task/Job: Scheduled Task
PID:2252

C:\Windows\system32\schtasks.exe
schtasks.exe /create /tn "SppExtComObj" /sc ONLOGON /tr "'C:\Windows\security\SppExtComObj.exe'" /rl HIGHEST /f
1⤵
- Process spawned unexpected child process
- Scheduled Task/Job: Scheduled Task
PID:1188

C:\Windows\system32\schtasks.exe
schtasks.exe /create /tn "SppExtComObjS" /sc MINUTE /mo 11 /tr "'C:\Windows\security\SppExtComObj.exe'" /rl HIGHEST /f
1⤵
- Process spawned unexpected child process
- Scheduled Task/Job: Scheduled Task
PID:3696

C:\Windows\system32\schtasks.exe
schtasks.exe /create /tn "SystemS" /sc MINUTE /mo 5 /tr "'C:\Program Files\Google\System.exe'" /f
1⤵
- Process spawned unexpected child process
- Scheduled Task/Job: Scheduled Task
PID:4456

C:\Windows\system32\schtasks.exe
schtasks.exe /create /tn "System" /sc ONLOGON /tr "'C:\Program Files\Google\System.exe'" /rl HIGHEST /f
1⤵
- Process spawned unexpected child process
- Scheduled Task/Job: Scheduled Task
PID:4188

C:\Windows\system32\schtasks.exe
schtasks.exe /create /tn "SystemS" /sc MINUTE /mo 7 /tr "'C:\Program Files\Google\System.exe'" /rl HIGHEST /f
1⤵
- Process spawned unexpected child process
- Scheduled Task/Job: Scheduled Task
PID:3796

C:\Windows\system32\schtasks.exe
schtasks.exe /create /tn "sihosts" /sc MINUTE /mo 9 /tr "'C:\Program Files\Windows Photo Viewer\sihost.exe'" /f
1⤵
- Process spawned unexpected child process
- Scheduled Task/Job: Scheduled Task
PID:1156

C:\Windows\system32\schtasks.exe
schtasks.exe /create /tn "sihost" /sc ONLOGON /tr "'C:\Program Files\Windows Photo Viewer\sihost.exe'" /rl HIGHEST /f
1⤵
- Process spawned unexpected child process
- Scheduled Task/Job: Scheduled Task
PID:3228

C:\Windows\system32\schtasks.exe
schtasks.exe /create /tn "sihosts" /sc MINUTE /mo 7 /tr "'C:\Program Files\Windows Photo Viewer\sihost.exe'" /rl HIGHEST /f
1⤵
- Process spawned unexpected child process
- Scheduled Task/Job: Scheduled Task
PID:1728

C:\Windows\system32\schtasks.exe
schtasks.exe /create /tn "sysmons" /sc MINUTE /mo 8 /tr "'C:\Program Files\MSBuild\Microsoft\Windows Workflow Foundation\v3.0\sysmon.exe'" /f
1⤵
- Process spawned unexpected child process
- Scheduled Task/Job: Scheduled Task
PID:4168

C:\Windows\system32\schtasks.exe
schtasks.exe /create /tn "sysmon" /sc ONLOGON /tr "'C:\Program Files\MSBuild\Microsoft\Windows Workflow Foundation\v3.0\sysmon.exe'" /rl HIGHEST /f
1⤵
- Process spawned unexpected child process
- Scheduled Task/Job: Scheduled Task
PID:2376

C:\Windows\system32\schtasks.exe
schtasks.exe /create /tn "sysmons" /sc MINUTE /mo 6 /tr "'C:\Program Files\MSBuild\Microsoft\Windows Workflow Foundation\v3.0\sysmon.exe'" /rl HIGHEST /f
1⤵
- Process spawned unexpected child process
- Scheduled Task/Job: Scheduled Task
PID:3256

C:\Windows\system32\schtasks.exe
schtasks.exe /create /tn "fontdrvhostf" /sc MINUTE /mo 11 /tr "'C:\Program Files\Google\Chrome\Application\123.0.6312.123\fontdrvhost.exe'" /f
1⤵
- Process spawned unexpected child process
- Scheduled Task/Job: Scheduled Task
PID:3312

C:\Windows\system32\schtasks.exe
schtasks.exe /create /tn "fontdrvhost" /sc ONLOGON /tr "'C:\Program Files\Google\Chrome\Application\123.0.6312.123\fontdrvhost.exe'" /rl HIGHEST /f
1⤵
- Process spawned unexpected child process
- Scheduled Task/Job: Scheduled Task
PID:4780

C:\Windows\system32\schtasks.exe
schtasks.exe /create /tn "fontdrvhostf" /sc MINUTE /mo 5 /tr "'C:\Program Files\Google\Chrome\Application\123.0.6312.123\fontdrvhost.exe'" /rl HIGHEST /f
1⤵
- Process spawned unexpected child process
- Scheduled Task/Job: Scheduled Task
PID:4796

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

C:\Program Files\Google\System.exe

Filesize
828KB

MD5
deb7ba77dcf2e54fb23d1a9b0e51088d

SHA1
6468abad160c22594fc014d948963ba4a8565074

SHA256
05b123c99c5736a62f1cfd6bc6a9335a533849fe663d875d20ece0caca82e077

SHA512
18cedb50ceab47fed77100586bbb68692d82e4d3afe59815e0fb0d7c88677362756d2bcdc3003f0e6e1b2a3edff36ac450a9864d4d64ef5218612bc86e538de2

Download Submit
C:\Users\Admin\AppData\Local\Temp\2e6Xr0hkJU.bat

Filesize
243B

MD5
bd5faac457e8911c7369e9dad6c73642

SHA1
f0ed746786369750297cf8eccd0778ad82df9c2d

SHA256
e30e91edbf0a1c1f813371269db4749e3215b9d9932c79a0f1302300f0323b38

SHA512
799ae4cbe2097a451112b5f722ac22a942bbb06b3cbbc5b1ca6a363af64263f881ad8eeedfc7601a6e2692f29af3d1238a55463470776260c9c8104d2468dec8

Download Submit
memory/3472-0-0x00007FFA20943000-0x00007FFA20945000-memory.dmp

Filesize
8KB

Download
memory/3472-1-0x0000000000CE0000-0x0000000000DB6000-memory.dmp

Filesize
856KB

Download
memory/3472-2-0x00007FFA20940000-0x00007FFA21401000-memory.dmp

Filesize
10.8MB

Download
memory/3472-24-0x00007FFA20940000-0x00007FFA21401000-memory.dmp

Filesize
10.8MB

Download

Analysis

Sharing

General

Malware Config

Signatures

Processes

Network

MITRE ATT&CK Enterprise v15

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Downloads