dcrat | a64e0fad64514c66bc6750432d8c3ef96932f9902886f540cca217031d1cfc44

General

Target

F7361ED3503F11A56E8CC53AD6C277B8.exe
Size

1.2MB
MD5

f7361ed3503f11a56e8cc53ad6c277b8
SHA1

bfa62d30d715bf866d5a2a6198a474c316b3dc04
SHA256

a64e0fad64514c66bc6750432d8c3ef96932f9902886f540cca217031d1cfc44
SHA512

9828478b57e85a2341262127e3149f5a9e48523198665b99634738627f107c1f5ab0c30ad80819bd9c4920836585397f4caef83c6d955cca6f0074b212fa96a4
SSDEEP

24576:q2G/nvxW3WXlB6Fh3rXTamAQ8uwoqTWy1Y7i887KtU:qbA3q4h3rD5DiT1T2O

Score

10^/10

dcrat 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 24 IoCs

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

Processes:

schtasks.exeschtasks.exeschtasks.exeschtasks.exeschtasks.exeschtasks.exeschtasks.exeschtasks.exeschtasks.exeschtasks.exeschtasks.exeschtasks.exeschtasks.exeschtasks.exeschtasks.exeschtasks.exeschtasks.exeschtasks.exeschtasks.exeschtasks.exeschtasks.exeschtasks.exeschtasks.exeschtasks.exe

description	pid	pid_target	Process	procid_target
Parent C:\Windows\system32\wbem\wmiprvse.exe is not expected to spawn this process	2860	996	schtasks.exe	93
Parent C:\Windows\system32\wbem\wmiprvse.exe is not expected to spawn this process	1092	996	schtasks.exe	93
Parent C:\Windows\system32\wbem\wmiprvse.exe is not expected to spawn this process	4544	996	schtasks.exe	93
Parent C:\Windows\system32\wbem\wmiprvse.exe is not expected to spawn this process	964	996	schtasks.exe	93
Parent C:\Windows\system32\wbem\wmiprvse.exe is not expected to spawn this process	4364	996	schtasks.exe	93
Parent C:\Windows\system32\wbem\wmiprvse.exe is not expected to spawn this process	2776	996	schtasks.exe	93
Parent C:\Windows\system32\wbem\wmiprvse.exe is not expected to spawn this process	5100	996	schtasks.exe	93
Parent C:\Windows\system32\wbem\wmiprvse.exe is not expected to spawn this process	2208	996	schtasks.exe	93
Parent C:\Windows\system32\wbem\wmiprvse.exe is not expected to spawn this process	4748	996	schtasks.exe	93
Parent C:\Windows\system32\wbem\wmiprvse.exe is not expected to spawn this process	1356	996	schtasks.exe	93
Parent C:\Windows\system32\wbem\wmiprvse.exe is not expected to spawn this process	1940	996	schtasks.exe	93
Parent C:\Windows\system32\wbem\wmiprvse.exe is not expected to spawn this process	1752	996	schtasks.exe	93
Parent C:\Windows\system32\wbem\wmiprvse.exe is not expected to spawn this process	4664	996	schtasks.exe	93
Parent C:\Windows\system32\wbem\wmiprvse.exe is not expected to spawn this process	4348	996	schtasks.exe	93
Parent C:\Windows\system32\wbem\wmiprvse.exe is not expected to spawn this process	2328	996	schtasks.exe	93
Parent C:\Windows\system32\wbem\wmiprvse.exe is not expected to spawn this process	2884	996	schtasks.exe	93
Parent C:\Windows\system32\wbem\wmiprvse.exe is not expected to spawn this process	4984	996	schtasks.exe	93
Parent C:\Windows\system32\wbem\wmiprvse.exe is not expected to spawn this process	1936	996	schtasks.exe	93
Parent C:\Windows\system32\wbem\wmiprvse.exe is not expected to spawn this process	1552	996	schtasks.exe	93
Parent C:\Windows\system32\wbem\wmiprvse.exe is not expected to spawn this process	2832	996	schtasks.exe	93
Parent C:\Windows\system32\wbem\wmiprvse.exe is not expected to spawn this process	1692	996	schtasks.exe	93
Parent C:\Windows\system32\wbem\wmiprvse.exe is not expected to spawn this process	5084	996	schtasks.exe	93
Parent C:\Windows\system32\wbem\wmiprvse.exe is not expected to spawn this process	1248	996	schtasks.exe	93
Parent C:\Windows\system32\wbem\wmiprvse.exe is not expected to spawn this process	3980	996	schtasks.exe	93

DCRat payload 2 IoCs

Detects payload of DCRat, commonly dropped by NSIS installers.

rat

Processes:

resource	yara_rule
behavioral2/files/0x000a000000023b53-10.dat	dcrat
behavioral2/memory/3416-13-0x0000000000CA0000-0x0000000000D76000-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

Processes:

F7361ED3503F11A56E8CC53AD6C277B8.exeWScript.exeAgentserver.exe

description	ioc	Process
Key value queried	\REGISTRY\USER\S-1-5-21-2878641211-696417878-3864914810-1000\Control Panel\International\Geo\Nation	F7361ED3503F11A56E8CC53AD6C277B8.exe
Key value queried	\REGISTRY\USER\S-1-5-21-2878641211-696417878-3864914810-1000\Control Panel\International\Geo\Nation	WScript.exe
Key value queried	\REGISTRY\USER\S-1-5-21-2878641211-696417878-3864914810-1000\Control Panel\International\Geo\Nation	Agentserver.exe

Executes dropped EXE 2 IoCs

Processes:

Agentserver.execmd.exe

pid	Process
3416	Agentserver.exe
2036	cmd.exe

Drops file in System32 directory 2 IoCs

Processes:

Agentserver.exe

description	ioc	Process
File created	C:\Windows\SysWOW64\th-TH\RuntimeBroker.exe	Agentserver.exe
File created	C:\Windows\SysWOW64\th-TH\9e8d7a4ca61bd9	Agentserver.exe

Drops file in Program Files directory 4 IoCs

Processes:

Agentserver.exe

description	ioc	Process
File created	C:\Program Files (x86)\Microsoft\Edge\Application\Registry.exe	Agentserver.exe
File created	C:\Program Files (x86)\Microsoft\Edge\Application\ee2ad38f3d4382	Agentserver.exe
File created	C:\Program Files (x86)\Windows Sidebar\Shared Gadgets\csrss.exe	Agentserver.exe
File created	C:\Program Files (x86)\Windows Sidebar\Shared Gadgets\886983d96e3d3e	Agentserver.exe

Drops file in Windows directory 2 IoCs

Processes:

Agentserver.exe

description	ioc	Process
File created	C:\Windows\Sun\Java\fontdrvhost.exe	Agentserver.exe
File created	C:\Windows\Sun\Java\5b884080fd4f94	Agentserver.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 3 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

Processes:

F7361ED3503F11A56E8CC53AD6C277B8.exeWScript.execmd.exe

description	ioc	Process
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	F7361ED3503F11A56E8CC53AD6C277B8.exe
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	WScript.exe
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	cmd.exe

Modifies registry class 1 IoCs

Processes:

F7361ED3503F11A56E8CC53AD6C277B8.exe

description	ioc	Process
Key created	\REGISTRY\USER\S-1-5-21-2878641211-696417878-3864914810-1000_Classes\Local Settings	F7361ED3503F11A56E8CC53AD6C277B8.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

Processes:

schtasks.exeschtasks.exeschtasks.exeschtasks.exeschtasks.exeschtasks.exeschtasks.exeschtasks.exeschtasks.exeschtasks.exeschtasks.exeschtasks.exeschtasks.exeschtasks.exeschtasks.exeschtasks.exeschtasks.exeschtasks.exeschtasks.exeschtasks.exeschtasks.exeschtasks.exeschtasks.exeschtasks.exe

pid	Process
5100	schtasks.exe
2208	schtasks.exe
1356	schtasks.exe
4348	schtasks.exe
1692	schtasks.exe
1248	schtasks.exe
4544	schtasks.exe
4364	schtasks.exe
2328	schtasks.exe
1552	schtasks.exe
5084	schtasks.exe
2860	schtasks.exe
1092	schtasks.exe
1752	schtasks.exe
4984	schtasks.exe
1936	schtasks.exe
2832	schtasks.exe
3980	schtasks.exe
964	schtasks.exe
2776	schtasks.exe
4664	schtasks.exe
2884	schtasks.exe
4748	schtasks.exe
1940	schtasks.exe

Suspicious behavior: EnumeratesProcesses 14 IoCs

Processes:

Agentserver.execmd.exe

pid	Process
3416	Agentserver.exe
3416	Agentserver.exe
3416	Agentserver.exe
3416	Agentserver.exe
3416	Agentserver.exe
3416	Agentserver.exe
3416	Agentserver.exe
3416	Agentserver.exe
3416	Agentserver.exe
3416	Agentserver.exe
3416	Agentserver.exe
3416	Agentserver.exe
3416	Agentserver.exe
2036	cmd.exe

Suspicious use of AdjustPrivilegeToken 2 IoCs

Processes:

Agentserver.execmd.exe

description	pid	Process
Token: SeDebugPrivilege	3416	Agentserver.exe
Token: SeDebugPrivilege	2036	cmd.exe

Suspicious use of WriteProcessMemory 10 IoCs

Processes:

F7361ED3503F11A56E8CC53AD6C277B8.exeWScript.execmd.exeAgentserver.exe

description	pid	Process	procid_target
PID 916 wrote to memory of 4340	916	F7361ED3503F11A56E8CC53AD6C277B8.exe	85
PID 916 wrote to memory of 4340	916	F7361ED3503F11A56E8CC53AD6C277B8.exe	85
PID 916 wrote to memory of 4340	916	F7361ED3503F11A56E8CC53AD6C277B8.exe	85
PID 4340 wrote to memory of 2040	4340	WScript.exe	97
PID 4340 wrote to memory of 2040	4340	WScript.exe	97
PID 4340 wrote to memory of 2040	4340	WScript.exe	97
PID 2040 wrote to memory of 3416	2040	cmd.exe	99
PID 2040 wrote to memory of 3416	2040	cmd.exe	99
PID 3416 wrote to memory of 2036	3416	Agentserver.exe	124
PID 3416 wrote to memory of 2036	3416	Agentserver.exe	124

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\F7361ED3503F11A56E8CC53AD6C277B8.exe
"C:\Users\Admin\AppData\Local\Temp\F7361ED3503F11A56E8CC53AD6C277B8.exe"
1⤵
- Checks computer location settings
- System Location Discovery: System Language Discovery
- Modifies registry class
- Suspicious use of WriteProcessMemory
PID:916
- C:\Windows\SysWOW64\WScript.exe
  "C:\Windows\System32\WScript.exe" "C:\surrogateserverreviewsession\pmMvwz3lY7qlA.vbe"
  2⤵
  - Checks computer location settings
  - System Location Discovery: System Language Discovery
  - Suspicious use of WriteProcessMemory
  PID:4340
- - C:\Windows\SysWOW64\cmd.exe
    C:\Windows\system32\cmd.exe /c ""C:\surrogateserverreviewsession\cAWYZg0ZdjD2dKs6hjKja7TASB4qz.bat" "
    3⤵
    - System Location Discovery: System Language Discovery
    - Suspicious use of WriteProcessMemory
    PID:2040
  - - C:\surrogateserverreviewsession\Agentserver.exe
      "C:\surrogateserverreviewsession\Agentserver.exe"
      4⤵
      Checks computer location settings
      Executes dropped EXE
      Drops file in System32 directory
      Drops file in Program Files directory
      Drops file in Windows directory
      Suspicious behavior: EnumeratesProcesses
      Suspicious use of AdjustPrivilegeToken
      Suspicious use of WriteProcessMemory
      PID:3416
    - - C:\surrogateserverreviewsession\cmd.exe
        
        "C:\surrogateserverreviewsession\cmd.exe"
        5⤵
        Executes dropped EXE
        Suspicious behavior: EnumeratesProcesses
        Suspicious use of AdjustPrivilegeToken
        
        PID:2036

C:\Windows\system32\schtasks.exe
schtasks.exe /create /tn "upfcu" /sc MINUTE /mo 9 /tr "'C:\surrogateserverreviewsession\upfc.exe'" /f
1⤵
- Process spawned unexpected child process
- Scheduled Task/Job: Scheduled Task
PID:2860

C:\Windows\system32\schtasks.exe
schtasks.exe /create /tn "upfc" /sc ONLOGON /tr "'C:\surrogateserverreviewsession\upfc.exe'" /rl HIGHEST /f
1⤵
- Process spawned unexpected child process
- Scheduled Task/Job: Scheduled Task
PID:1092

C:\Windows\system32\schtasks.exe
schtasks.exe /create /tn "upfcu" /sc MINUTE /mo 9 /tr "'C:\surrogateserverreviewsession\upfc.exe'" /rl HIGHEST /f
1⤵
- Process spawned unexpected child process
- Scheduled Task/Job: Scheduled Task
PID:4544

C:\Windows\system32\schtasks.exe
schtasks.exe /create /tn "fontdrvhostf" /sc MINUTE /mo 13 /tr "'C:\Windows\Sun\Java\fontdrvhost.exe'" /f
1⤵
- Process spawned unexpected child process
- Scheduled Task/Job: Scheduled Task
PID:964

C:\Windows\system32\schtasks.exe
schtasks.exe /create /tn "fontdrvhost" /sc ONLOGON /tr "'C:\Windows\Sun\Java\fontdrvhost.exe'" /rl HIGHEST /f
1⤵
- Process spawned unexpected child process
- Scheduled Task/Job: Scheduled Task
PID:4364

C:\Windows\system32\schtasks.exe
schtasks.exe /create /tn "fontdrvhostf" /sc MINUTE /mo 6 /tr "'C:\Windows\Sun\Java\fontdrvhost.exe'" /rl HIGHEST /f
1⤵
- Process spawned unexpected child process
- Scheduled Task/Job: Scheduled Task
PID:2776

C:\Windows\system32\schtasks.exe
schtasks.exe /create /tn "sppsvcs" /sc MINUTE /mo 8 /tr "'C:\Users\All Users\Microsoft OneDrive\setup\sppsvc.exe'" /f
1⤵
- Process spawned unexpected child process
- Scheduled Task/Job: Scheduled Task
PID:5100

C:\Windows\system32\schtasks.exe
schtasks.exe /create /tn "sppsvc" /sc ONLOGON /tr "'C:\Users\All Users\Microsoft OneDrive\setup\sppsvc.exe'" /rl HIGHEST /f
1⤵
- Process spawned unexpected child process
- Scheduled Task/Job: Scheduled Task
PID:2208

C:\Windows\system32\schtasks.exe
schtasks.exe /create /tn "sppsvcs" /sc MINUTE /mo 6 /tr "'C:\Users\All Users\Microsoft OneDrive\setup\sppsvc.exe'" /rl HIGHEST /f
1⤵
- Process spawned unexpected child process
- Scheduled Task/Job: Scheduled Task
PID:4748

C:\Windows\system32\schtasks.exe
schtasks.exe /create /tn "RuntimeBrokerR" /sc MINUTE /mo 10 /tr "'C:\Windows\SysWOW64\th-TH\RuntimeBroker.exe'" /f
1⤵
- Process spawned unexpected child process
- Scheduled Task/Job: Scheduled Task
PID:1356

C:\Windows\system32\schtasks.exe
schtasks.exe /create /tn "RuntimeBroker" /sc ONLOGON /tr "'C:\Windows\SysWOW64\th-TH\RuntimeBroker.exe'" /rl HIGHEST /f
1⤵
- Process spawned unexpected child process
- Scheduled Task/Job: Scheduled Task
PID:1940

C:\Windows\system32\schtasks.exe
schtasks.exe /create /tn "RuntimeBrokerR" /sc MINUTE /mo 7 /tr "'C:\Windows\SysWOW64\th-TH\RuntimeBroker.exe'" /rl HIGHEST /f
1⤵
- Process spawned unexpected child process
- Scheduled Task/Job: Scheduled Task
PID:1752

C:\Windows\system32\schtasks.exe
schtasks.exe /create /tn "cmdc" /sc MINUTE /mo 5 /tr "'C:\surrogateserverreviewsession\cmd.exe'" /f
1⤵
- Process spawned unexpected child process
- Scheduled Task/Job: Scheduled Task
PID:4664

C:\Windows\system32\schtasks.exe
schtasks.exe /create /tn "cmd" /sc ONLOGON /tr "'C:\surrogateserverreviewsession\cmd.exe'" /rl HIGHEST /f
1⤵
- Process spawned unexpected child process
- Scheduled Task/Job: Scheduled Task
PID:4348

C:\Windows\system32\schtasks.exe
schtasks.exe /create /tn "cmdc" /sc MINUTE /mo 12 /tr "'C:\surrogateserverreviewsession\cmd.exe'" /rl HIGHEST /f
1⤵
- Process spawned unexpected child process
- Scheduled Task/Job: Scheduled Task
PID:2328

C:\Windows\system32\schtasks.exe
schtasks.exe /create /tn "RegistryR" /sc MINUTE /mo 13 /tr "'C:\Program Files (x86)\Microsoft\Edge\Application\Registry.exe'" /f
1⤵
- Process spawned unexpected child process
- Scheduled Task/Job: Scheduled Task
PID:2884

C:\Windows\system32\schtasks.exe
schtasks.exe /create /tn "Registry" /sc ONLOGON /tr "'C:\Program Files (x86)\Microsoft\Edge\Application\Registry.exe'" /rl HIGHEST /f
1⤵
- Process spawned unexpected child process
- Scheduled Task/Job: Scheduled Task
PID:4984

C:\Windows\system32\schtasks.exe
schtasks.exe /create /tn "RegistryR" /sc MINUTE /mo 7 /tr "'C:\Program Files (x86)\Microsoft\Edge\Application\Registry.exe'" /rl HIGHEST /f
1⤵
- Process spawned unexpected child process
- Scheduled Task/Job: Scheduled Task
PID:1936

C:\Windows\system32\schtasks.exe
schtasks.exe /create /tn "csrssc" /sc MINUTE /mo 10 /tr "'C:\Program Files (x86)\Windows Sidebar\Shared Gadgets\csrss.exe'" /f
1⤵
- Process spawned unexpected child process
- Scheduled Task/Job: Scheduled Task
PID:1552

C:\Windows\system32\schtasks.exe
schtasks.exe /create /tn "csrss" /sc ONLOGON /tr "'C:\Program Files (x86)\Windows Sidebar\Shared Gadgets\csrss.exe'" /rl HIGHEST /f
1⤵
- Process spawned unexpected child process
- Scheduled Task/Job: Scheduled Task
PID:2832

C:\Windows\system32\schtasks.exe
schtasks.exe /create /tn "csrssc" /sc MINUTE /mo 14 /tr "'C:\Program Files (x86)\Windows Sidebar\Shared Gadgets\csrss.exe'" /rl HIGHEST /f
1⤵
- Process spawned unexpected child process
- Scheduled Task/Job: Scheduled Task
PID:1692

C:\Windows\system32\schtasks.exe
schtasks.exe /create /tn "sysmons" /sc MINUTE /mo 7 /tr "'C:\Recovery\WindowsRE\sysmon.exe'" /f
1⤵
- Process spawned unexpected child process
- Scheduled Task/Job: Scheduled Task
PID:5084

C:\Windows\system32\schtasks.exe
schtasks.exe /create /tn "sysmon" /sc ONLOGON /tr "'C:\Recovery\WindowsRE\sysmon.exe'" /rl HIGHEST /f
1⤵
- Process spawned unexpected child process
- Scheduled Task/Job: Scheduled Task
PID:1248

C:\Windows\system32\schtasks.exe
schtasks.exe /create /tn "sysmons" /sc MINUTE /mo 9 /tr "'C:\Recovery\WindowsRE\sysmon.exe'" /rl HIGHEST /f
1⤵
- Process spawned unexpected child process
- Scheduled Task/Job: Scheduled Task
PID:3980

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

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:\surrogateserverreviewsession\Agentserver.exe

Filesize
829KB

MD5
f1aaac4c20df683e3596c8a7cd3da07e

SHA1
928e098dea596d12e22ed56f85cf028bcf27b31f

SHA256
f3dd651e1ee7ab505f52e2c269a70e661d06e0eb51285ab41f89b3736352fa89

SHA512
613387cc5d808dd7a9199212476a2ff34a92f5919d1ea353b204aa931248b2fbf0efe9261bfca6ddb804621a8d6234df4558cffc326050a9424957de3b05c6e2

Download Submit
C:\surrogateserverreviewsession\cAWYZg0ZdjD2dKs6hjKja7TASB4qz.bat

Filesize
49B

MD5
92e94bdecb9521be3a47f97d2e66384e

SHA1
eee4fd6f12d9d0194d0bcc5703e11dfc23a3ad5b

SHA256
e248596953f8a96baf8a2d3f4eb134b005aeddeb7f2a7d5943c2788face1ca15

SHA512
b5a418ab94b9a8be9d667411e838ee7b16be373aa68d73f5c8bed8f47dc9bc4c38abc8dec7f06f4f778c9aa72abdd0060293c573ad94832e24605ebf60991224

Download Submit
C:\surrogateserverreviewsession\pmMvwz3lY7qlA.vbe

Filesize
234B

MD5
94c156c40c9fa1a17ea1d1be3e874aa1

SHA1
95b81d6f87a35f34f81d01c31465c2fe0f743a7b

SHA256
33abe968c7250e8fe61d27e7507f8271a989c0bf4ff42133159503f2a4719b5a

SHA512
a52e0fcbefed81b7590ceed9b44762520580d946d72a5c3ac36fc6d07a964253a812e75d3ceba42f83dddd15fbe2114f65f7148975fcdd20c78547a59de132ab

Download Submit
memory/3416-12-0x00007FFF49283000-0x00007FFF49285000-memory.dmp

Filesize
8KB

Download
memory/3416-13-0x0000000000CA0000-0x0000000000D76000-memory.dmp

Filesize
856KB

Download

Analysis

Sharing

General

Malware Config

Signatures

Processes

Network

MITRE ATT&CK Enterprise v15

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Downloads