dcrat | a09c7f65b8c6559808fe7e429078639a61816e5c76e08466dfb5c03b04f27a18

General

Target

9E7C6C00FFD9D6501586FF6E3A87FF47.exe
Size

1.1MB
MD5

9e7c6c00ffd9d6501586ff6e3a87ff47
SHA1

da1f6be302efc67fb981d2cac011caa3ca40df93
SHA256

a09c7f65b8c6559808fe7e429078639a61816e5c76e08466dfb5c03b04f27a18
SHA512

6355e8ac75f8da391be58737e8f2f56a99dfbfb757d5044119d0c6e67954656ce7d3da65790b46c67ed4744154810874ed9e1964d3eb68a4420ac81072cdd5e0
SSDEEP

24576:u2G/nvxW3WieC+TmsHesd2RxXEh2NnJ40Vm:ubA3j+TmsMQgFS

Score

10^/10

dcrat defense_evasion discovery 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 21 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	3952	1052	schtasks.exe	88
Parent C:\Windows\system32\wbem\wmiprvse.exe is not expected to spawn this process	3124	1052	schtasks.exe	88
Parent C:\Windows\system32\wbem\wmiprvse.exe is not expected to spawn this process	4456	1052	schtasks.exe	88
Parent C:\Windows\system32\wbem\wmiprvse.exe is not expected to spawn this process	3496	1052	schtasks.exe	88
Parent C:\Windows\system32\wbem\wmiprvse.exe is not expected to spawn this process	2440	1052	schtasks.exe	88
Parent C:\Windows\system32\wbem\wmiprvse.exe is not expected to spawn this process	836	1052	schtasks.exe	88
Parent C:\Windows\system32\wbem\wmiprvse.exe is not expected to spawn this process	4320	1052	schtasks.exe	88
Parent C:\Windows\system32\wbem\wmiprvse.exe is not expected to spawn this process	4436	1052	schtasks.exe	88
Parent C:\Windows\system32\wbem\wmiprvse.exe is not expected to spawn this process	4676	1052	schtasks.exe	88
Parent C:\Windows\system32\wbem\wmiprvse.exe is not expected to spawn this process	3676	1052	schtasks.exe	88
Parent C:\Windows\system32\wbem\wmiprvse.exe is not expected to spawn this process	4092	1052	schtasks.exe	88
Parent C:\Windows\system32\wbem\wmiprvse.exe is not expected to spawn this process	2428	1052	schtasks.exe	88
Parent C:\Windows\system32\wbem\wmiprvse.exe is not expected to spawn this process	2608	1052	schtasks.exe	88
Parent C:\Windows\system32\wbem\wmiprvse.exe is not expected to spawn this process	3600	1052	schtasks.exe	88
Parent C:\Windows\system32\wbem\wmiprvse.exe is not expected to spawn this process	1660	1052	schtasks.exe	88
Parent C:\Windows\system32\wbem\wmiprvse.exe is not expected to spawn this process	4128	1052	schtasks.exe	88
Parent C:\Windows\system32\wbem\wmiprvse.exe is not expected to spawn this process	2232	1052	schtasks.exe	88
Parent C:\Windows\system32\wbem\wmiprvse.exe is not expected to spawn this process	1476	1052	schtasks.exe	88
Parent C:\Windows\system32\wbem\wmiprvse.exe is not expected to spawn this process	2532	1052	schtasks.exe	88
Parent C:\Windows\system32\wbem\wmiprvse.exe is not expected to spawn this process	1796	1052	schtasks.exe	88
Parent C:\Windows\system32\wbem\wmiprvse.exe is not expected to spawn this process	5084	1052	schtasks.exe	88

DCRat payload 2 IoCs

Detects payload of DCRat, commonly dropped by NSIS installers.

rat

resource	yara_rule
behavioral2/files/0x0007000000023ca2-9.dat	dcrat
behavioral2/memory/1544-13-0x0000000000B40000-0x0000000000C18000-memory.dmp	dcrat

Disables Task Manager via registry modification
defense_evasion

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-1-5-21-940901362-3608833189-1915618603-1000\Control Panel\International\Geo\Nation	agentbroker.exe
Key value queried	\REGISTRY\USER\S-1-5-21-940901362-3608833189-1915618603-1000\Control Panel\International\Geo\Nation	9E7C6C00FFD9D6501586FF6E3A87FF47.exe
Key value queried	\REGISTRY\USER\S-1-5-21-940901362-3608833189-1915618603-1000\Control Panel\International\Geo\Nation	WScript.exe

Executes dropped EXE 2 IoCs

pid	Process
1544	agentbroker.exe
2528	SppExtComObj.exe

Drops file in Program Files directory 4 IoCs

description	ioc	Process
File created	C:\Program Files\Windows Security\BrowserCore\en-US\RuntimeBroker.exe	agentbroker.exe
File created	C:\Program Files\Windows Security\BrowserCore\en-US\9e8d7a4ca61bd9	agentbroker.exe
File created	C:\Program Files\Internet Explorer\es-ES\dwm.exe	agentbroker.exe
File created	C:\Program Files\Internet Explorer\es-ES\6cb0b6c459d5d3	agentbroker.exe

Drops file in Windows directory 3 IoCs

description	ioc	Process
File created	C:\Windows\PrintDialog\pris\csrss.exe	agentbroker.exe
File opened for modification	C:\Windows\PrintDialog\pris\csrss.exe	agentbroker.exe
File created	C:\Windows\PrintDialog\pris\886983d96e3d3e	agentbroker.exe

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

System Information Discovery
T1082

System Location Discovery: System Language Discovery 1 TTPs 4 IoCs

Attempt gather information about the system language of a victim in order to infer the geographical location of that host.

discovery

System Language Discovery

T1614.001

description	ioc	Process
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	9E7C6C00FFD9D6501586FF6E3A87FF47.exe
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	WScript.exe
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	cmd.exe
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	reg.exe

Modifies registry class 2 IoCs

description	ioc	Process
Key created	\REGISTRY\USER\S-1-5-21-940901362-3608833189-1915618603-1000_Classes\Local Settings	9E7C6C00FFD9D6501586FF6E3A87FF47.exe
Key created	\REGISTRY\USER\S-1-5-21-940901362-3608833189-1915618603-1000_Classes\Local Settings	agentbroker.exe

Modifies registry key 1 TTPs 1 IoCs

Modify Registry

T1112

pid	Process
1504	reg.exe

Scheduled Task/Job: Scheduled Task 1 TTPs 21 IoCs

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

persistence execution

Scheduled Task

T1053.005

pid	Process
4092	schtasks.exe
3600	schtasks.exe
1660	schtasks.exe
3952	schtasks.exe
3124	schtasks.exe
2608	schtasks.exe
2232	schtasks.exe
1476	schtasks.exe
3496	schtasks.exe
2440	schtasks.exe
2428	schtasks.exe
4128	schtasks.exe
2532	schtasks.exe
4320	schtasks.exe
4676	schtasks.exe
4436	schtasks.exe
3676	schtasks.exe
1796	schtasks.exe
5084	schtasks.exe
4456	schtasks.exe
836	schtasks.exe

Suspicious behavior: EnumeratesProcesses 2 IoCs

pid	Process
1544	agentbroker.exe
2528	SppExtComObj.exe

Suspicious use of AdjustPrivilegeToken 2 IoCs

description	pid	Process
Token: SeDebugPrivilege	1544	agentbroker.exe
Token: SeDebugPrivilege	2528	SppExtComObj.exe

Suspicious use of WriteProcessMemory 17 IoCs

description	pid	Process	procid_target
PID 1560 wrote to memory of 3388	1560	9E7C6C00FFD9D6501586FF6E3A87FF47.exe	83
PID 1560 wrote to memory of 3388	1560	9E7C6C00FFD9D6501586FF6E3A87FF47.exe	83
PID 1560 wrote to memory of 3388	1560	9E7C6C00FFD9D6501586FF6E3A87FF47.exe	83
PID 3388 wrote to memory of 2108	3388	WScript.exe	85
PID 3388 wrote to memory of 2108	3388	WScript.exe	85
PID 3388 wrote to memory of 2108	3388	WScript.exe	85
PID 2108 wrote to memory of 1544	2108	cmd.exe	87
PID 2108 wrote to memory of 1544	2108	cmd.exe	87
PID 1544 wrote to memory of 4888	1544	agentbroker.exe	111
PID 1544 wrote to memory of 4888	1544	agentbroker.exe	111
PID 2108 wrote to memory of 1504	2108	cmd.exe	113
PID 2108 wrote to memory of 1504	2108	cmd.exe	113
PID 2108 wrote to memory of 1504	2108	cmd.exe	113
PID 4888 wrote to memory of 3440	4888	cmd.exe	114
PID 4888 wrote to memory of 3440	4888	cmd.exe	114
PID 4888 wrote to memory of 2528	4888	cmd.exe	116
PID 4888 wrote to memory of 2528	4888	cmd.exe	116

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\9E7C6C00FFD9D6501586FF6E3A87FF47.exe
"C:\Users\Admin\AppData\Local\Temp\9E7C6C00FFD9D6501586FF6E3A87FF47.exe"
1⤵
- Checks computer location settings
- System Location Discovery: System Language Discovery
- Modifies registry class
- Suspicious use of WriteProcessMemory
PID:1560
- C:\Windows\SysWOW64\WScript.exe
  "C:\Windows\System32\WScript.exe" "C:\portbrowserSvc\niRlsT7U.vbe"
  2⤵
  - Checks computer location settings
  - System Location Discovery: System Language Discovery
  - Suspicious use of WriteProcessMemory
  PID:3388
- - C:\Windows\SysWOW64\cmd.exe
    C:\Windows\system32\cmd.exe /c ""C:\portbrowserSvc\rMXTEEa.bat" "
    3⤵
    - System Location Discovery: System Language Discovery
    - Suspicious use of WriteProcessMemory
    PID:2108
  - - C:\portbrowserSvc\agentbroker.exe
      "C:\portbrowserSvc\agentbroker.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:1544
    - - C:\Windows\System32\cmd.exe
        
        "C:\Windows\System32\cmd.exe" /C "C:\Users\Admin\AppData\Local\Temp\RyEOv3RD96.bat"
        5⤵
        Suspicious use of WriteProcessMemory
        
        PID:4888
      - C:\Windows\system32\w32tm.exe
        
        w32tm /stripchart /computer:localhost /period:5 /dataonly /samples:2
        6⤵
        
        PID:3440
      - C:\Users\Default\Cookies\SppExtComObj.exe
        
        "C:\Users\Default\Cookies\SppExtComObj.exe"
        6⤵
        Executes dropped EXE
        Suspicious behavior: EnumeratesProcesses
        Suspicious use of AdjustPrivilegeToken
        
        PID:2528
  - - C:\Windows\SysWOW64\reg.exe
      reg add HKCU\Software\Microsoft\Windows\CurrentVersion\Policies\System /v DisableTaskMgr /t REG_DWORD /d 1 /f
      4⤵
      System Location Discovery: System Language Discovery
      Modifies registry key
      PID:1504

C:\Windows\system32\schtasks.exe
schtasks.exe /create /tn "csrssc" /sc MINUTE /mo 12 /tr "'C:\Windows\PrintDialog\pris\csrss.exe'" /f
1⤵
- Process spawned unexpected child process
- Scheduled Task/Job: Scheduled Task
PID:3952

C:\Windows\system32\schtasks.exe
schtasks.exe /create /tn "csrss" /sc ONLOGON /tr "'C:\Windows\PrintDialog\pris\csrss.exe'" /rl HIGHEST /f
1⤵
- Process spawned unexpected child process
- Scheduled Task/Job: Scheduled Task
PID:3124

C:\Windows\system32\schtasks.exe
schtasks.exe /create /tn "csrssc" /sc MINUTE /mo 14 /tr "'C:\Windows\PrintDialog\pris\csrss.exe'" /rl HIGHEST /f
1⤵
- Process spawned unexpected child process
- Scheduled Task/Job: Scheduled Task
PID:4456

C:\Windows\system32\schtasks.exe
schtasks.exe /create /tn "dwmd" /sc MINUTE /mo 10 /tr "'C:\Program Files\Internet Explorer\es-ES\dwm.exe'" /f
1⤵
- Process spawned unexpected child process
- Scheduled Task/Job: Scheduled Task
PID:3496

C:\Windows\system32\schtasks.exe
schtasks.exe /create /tn "dwm" /sc ONLOGON /tr "'C:\Program Files\Internet Explorer\es-ES\dwm.exe'" /rl HIGHEST /f
1⤵
- Process spawned unexpected child process
- Scheduled Task/Job: Scheduled Task
PID:2440

C:\Windows\system32\schtasks.exe
schtasks.exe /create /tn "dwmd" /sc MINUTE /mo 12 /tr "'C:\Program Files\Internet Explorer\es-ES\dwm.exe'" /rl HIGHEST /f
1⤵
- Process spawned unexpected child process
- Scheduled Task/Job: Scheduled Task
PID:836

C:\Windows\system32\schtasks.exe
schtasks.exe /create /tn "SppExtComObjS" /sc MINUTE /mo 14 /tr "'C:\Users\Default\Cookies\SppExtComObj.exe'" /f
1⤵
- Process spawned unexpected child process
- Scheduled Task/Job: Scheduled Task
PID:4320

C:\Windows\system32\schtasks.exe
schtasks.exe /create /tn "SppExtComObj" /sc ONLOGON /tr "'C:\Users\Default\Cookies\SppExtComObj.exe'" /rl HIGHEST /f
1⤵
- Process spawned unexpected child process
- Scheduled Task/Job: Scheduled Task
PID:4436

C:\Windows\system32\schtasks.exe
schtasks.exe /create /tn "SppExtComObjS" /sc MINUTE /mo 11 /tr "'C:\Users\Default\Cookies\SppExtComObj.exe'" /rl HIGHEST /f
1⤵
- Process spawned unexpected child process
- Scheduled Task/Job: Scheduled Task
PID:4676

C:\Windows\system32\schtasks.exe
schtasks.exe /create /tn "dwmd" /sc MINUTE /mo 13 /tr "'C:\Users\All Users\dwm.exe'" /f
1⤵
- Process spawned unexpected child process
- Scheduled Task/Job: Scheduled Task
PID:3676

C:\Windows\system32\schtasks.exe
schtasks.exe /create /tn "dwm" /sc ONLOGON /tr "'C:\Users\All Users\dwm.exe'" /rl HIGHEST /f
1⤵
- Process spawned unexpected child process
- Scheduled Task/Job: Scheduled Task
PID:4092

C:\Windows\system32\schtasks.exe
schtasks.exe /create /tn "dwmd" /sc MINUTE /mo 5 /tr "'C:\Users\All Users\dwm.exe'" /rl HIGHEST /f
1⤵
- Process spawned unexpected child process
- Scheduled Task/Job: Scheduled Task
PID:2428

C:\Windows\system32\schtasks.exe
schtasks.exe /create /tn "SearchAppS" /sc MINUTE /mo 13 /tr "'C:\Users\Default\SearchApp.exe'" /f
1⤵
- Process spawned unexpected child process
- Scheduled Task/Job: Scheduled Task
PID:2608

C:\Windows\system32\schtasks.exe
schtasks.exe /create /tn "SearchApp" /sc ONLOGON /tr "'C:\Users\Default\SearchApp.exe'" /rl HIGHEST /f
1⤵
- Process spawned unexpected child process
- Scheduled Task/Job: Scheduled Task
PID:3600

C:\Windows\system32\schtasks.exe
schtasks.exe /create /tn "SearchAppS" /sc MINUTE /mo 8 /tr "'C:\Users\Default\SearchApp.exe'" /rl HIGHEST /f
1⤵
- Process spawned unexpected child process
- Scheduled Task/Job: Scheduled Task
PID:1660

C:\Windows\system32\schtasks.exe
schtasks.exe /create /tn "conhostc" /sc MINUTE /mo 14 /tr "'C:\Users\Default User\conhost.exe'" /f
1⤵
- Process spawned unexpected child process
- Scheduled Task/Job: Scheduled Task
PID:4128

C:\Windows\system32\schtasks.exe
schtasks.exe /create /tn "conhost" /sc ONLOGON /tr "'C:\Users\Default User\conhost.exe'" /rl HIGHEST /f
1⤵
- Process spawned unexpected child process
- Scheduled Task/Job: Scheduled Task
PID:2232

C:\Windows\system32\schtasks.exe
schtasks.exe /create /tn "conhostc" /sc MINUTE /mo 5 /tr "'C:\Users\Default User\conhost.exe'" /rl HIGHEST /f
1⤵
- Process spawned unexpected child process
- Scheduled Task/Job: Scheduled Task
PID:1476

C:\Windows\system32\schtasks.exe
schtasks.exe /create /tn "RuntimeBrokerR" /sc MINUTE /mo 12 /tr "'C:\Program Files\Windows Security\BrowserCore\en-US\RuntimeBroker.exe'" /f
1⤵
- Process spawned unexpected child process
- Scheduled Task/Job: Scheduled Task
PID:2532

C:\Windows\system32\schtasks.exe
schtasks.exe /create /tn "RuntimeBroker" /sc ONLOGON /tr "'C:\Program Files\Windows Security\BrowserCore\en-US\RuntimeBroker.exe'" /rl HIGHEST /f
1⤵
- Process spawned unexpected child process
- Scheduled Task/Job: Scheduled Task
PID:1796

C:\Windows\system32\schtasks.exe
schtasks.exe /create /tn "RuntimeBrokerR" /sc MINUTE /mo 6 /tr "'C:\Program Files\Windows Security\BrowserCore\en-US\RuntimeBroker.exe'" /rl HIGHEST /f
1⤵
- Process spawned unexpected child process
- Scheduled Task/Job: Scheduled Task
PID:5084

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

Modify Registry

1

T1112

Credential Access

Discovery

Query Registry

2

T1012

System Information Discovery

2

T1082

System Location Discovery

1

T1614

System Language Discovery

1

T1614.001

Lateral Movement

Collection

Command and Control

Exfiltration

Impact

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Downloads

C:\Users\Admin\AppData\Local\Temp\RyEOv3RD96.bat

Filesize
206B

MD5
af5922b61a8d83767a234090b9a43838

SHA1
8d692f75a90adede524eae2949c55e5ecb9cb1e2

SHA256
cce764bd68d2c6169411d093d5dc0a3a5e7122387d6eaa484c3ab4f86a2962d3

SHA512
7708d90991964b864d4f22662ccbfac6445b3e5c1de0f899339bc73fce3a9d560456726b12d368b65e8887459a73b4cb1fcec540f22efce5f85ae7bff3e40d8c

Download Submit
C:\portbrowserSvc\agentbroker.exe

Filesize
832KB

MD5
dd3da669f2a243c4dbbbfc8f063acca9

SHA1
4f41bf6dd2bafc00cd09aac21567849ff651311c

SHA256
ac07273ab1dc75a040355ab1decb04494f2304eec1b95ed9d6ff64d329e84cc1

SHA512
bdc0c28061b36dc4f871c2cf8eb824c0d4956749219ff2bba91e3fb9809d68cc82df438804aa7b5f8266bace538b933e2c43af8c2a7feb01bd0d84afd82f07ac

Download Submit
C:\portbrowserSvc\niRlsT7U.vbe

Filesize
198B

MD5
c2147d735326a98b5d0e5cf67ab043a6

SHA1
0603c7a8209fe35f02127aa73671a2ca6e5c828b

SHA256
66358939bf43e6b9388c7c41f80e5b85ec6d05c100b0a955b08640b39c8934dc

SHA512
4836afcdacf6ced1f6b44bbef62635eab4a3e15084ade4b918e0e712af359137300a22c80411ffa016f7f1b204eac4205e1be0ebf46b6addaefdae185ce0c21e

Download Submit
C:\portbrowserSvc\rMXTEEa.bat

Filesize
147B

MD5
5d83da11e18d561cdd46c036ceada49d

SHA1
fcb56d68080cea1f5495ccd915fd0e77d5cac6dd

SHA256
bea380a9fde04cf3178e4c4bd037db55bdae138a4b0263ccba9ed6274b5d102e

SHA512
4b5f09bac233c99d4e0e052950ec2b6f206c9244a09b96b65bdadd149a7b8bbf53d11b075e399ce3626a3f3902b81b85234b85fd6cf8845b2fce42e6ad1f7a94

Download Submit
memory/1544-12-0x00007FFE433D3000-0x00007FFE433D5000-memory.dmp

Filesize
8KB

Download
memory/1544-13-0x0000000000B40000-0x0000000000C18000-memory.dmp

Filesize
864KB

Download

Analysis

Sharing

General

Malware Config

Signatures

Processes

Network

MITRE ATT&CK Enterprise v15

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Downloads