dcrat | ab7307731f5026b64631fe11b117e29ed3a4c851df388238048b6370bb99fee0

General

Target

ab7307731f5026b64631fe11b117e29ed3a4c851df388238048b6370bb99fee0N.exe
Size

1.6MB
MD5

8ce0a9103ab10fed54094a3a2d1146e0
SHA1

4aef0ddaa8d065170c0ff2cc099c31aa6b1085aa
SHA256

ab7307731f5026b64631fe11b117e29ed3a4c851df388238048b6370bb99fee0
SHA512

cf0adcb740f1eec83e6477bc487cf3a0d152222e08f186b78a674e0e9178b591e7088c5a2d2763dbd6eed55e3eef2bbdfaddf1791158e7dad7c891577f71e76f
SSDEEP

24576:NsoVH984fBm2iMbyrpEGwFQ0Gm3eQk31V6hK5r898Qs:NAtJeGwkm3eQk31rF8V

Score

10^/10

dcrat evasion infostealer rat trojan

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 15 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	3248	1780	schtasks.exe	84
Parent C:\Windows\system32\wbem\wmiprvse.exe is not expected to spawn this process	2532	1780	schtasks.exe	84
Parent C:\Windows\system32\wbem\wmiprvse.exe is not expected to spawn this process	4312	1780	schtasks.exe	84
Parent C:\Windows\system32\wbem\wmiprvse.exe is not expected to spawn this process	1340	1780	schtasks.exe	84
Parent C:\Windows\system32\wbem\wmiprvse.exe is not expected to spawn this process	2460	1780	schtasks.exe	84
Parent C:\Windows\system32\wbem\wmiprvse.exe is not expected to spawn this process	596	1780	schtasks.exe	84
Parent C:\Windows\system32\wbem\wmiprvse.exe is not expected to spawn this process	3812	1780	schtasks.exe	84
Parent C:\Windows\system32\wbem\wmiprvse.exe is not expected to spawn this process	1764	1780	schtasks.exe	84
Parent C:\Windows\system32\wbem\wmiprvse.exe is not expected to spawn this process	928	1780	schtasks.exe	84
Parent C:\Windows\system32\wbem\wmiprvse.exe is not expected to spawn this process	3868	1780	schtasks.exe	84
Parent C:\Windows\system32\wbem\wmiprvse.exe is not expected to spawn this process	3968	1780	schtasks.exe	84
Parent C:\Windows\system32\wbem\wmiprvse.exe is not expected to spawn this process	2244	1780	schtasks.exe	84
Parent C:\Windows\system32\wbem\wmiprvse.exe is not expected to spawn this process	2056	1780	schtasks.exe	84
Parent C:\Windows\system32\wbem\wmiprvse.exe is not expected to spawn this process	748	1780	schtasks.exe	84
Parent C:\Windows\system32\wbem\wmiprvse.exe is not expected to spawn this process	3660	1780	schtasks.exe	84

UAC bypass 3 TTPs 6 IoCs

evasion trojan

Bypass User Account Control

T1548.002

Disable or Modify Tools

T1562.001

Modify Registry

T1112

description	ioc	Process
Set value (int)	\REGISTRY\MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Policies\System\EnableLUA = "0"	winlogon.exe
Set value (int)	\REGISTRY\MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Policies\System\ConsentPromptBehaviorAdmin = "0"	winlogon.exe
Set value (int)	\REGISTRY\MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Policies\System\PromptOnSecureDesktop = "0"	winlogon.exe
Set value (int)	\REGISTRY\MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Policies\System\EnableLUA = "0"	ab7307731f5026b64631fe11b117e29ed3a4c851df388238048b6370bb99fee0N.exe
Set value (int)	\REGISTRY\MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Policies\System\ConsentPromptBehaviorAdmin = "0"	ab7307731f5026b64631fe11b117e29ed3a4c851df388238048b6370bb99fee0N.exe
Set value (int)	\REGISTRY\MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Policies\System\PromptOnSecureDesktop = "0"	ab7307731f5026b64631fe11b117e29ed3a4c851df388238048b6370bb99fee0N.exe

DCRat payload 2 IoCs

Detects payload of DCRat, commonly dropped by NSIS installers.

rat

resource	yara_rule
behavioral2/memory/4828-1-0x00000000001A0000-0x0000000000340000-memory.dmp	dcrat
behavioral2/files/0x0007000000023cc5-25.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-1-5-21-493223053-2004649691-1575712786-1000\Control Panel\International\Geo\Nation	ab7307731f5026b64631fe11b117e29ed3a4c851df388238048b6370bb99fee0N.exe

Executes dropped EXE 1 IoCs

pid	Process
1592	winlogon.exe

Checks whether UAC is enabled 1 TTPs 4 IoCs

evasion trojan

System Information Discovery

T1082

description	ioc	Process
Key value queried	\REGISTRY\MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Policies\System\EnableLUA	ab7307731f5026b64631fe11b117e29ed3a4c851df388238048b6370bb99fee0N.exe
Set value (int)	\REGISTRY\MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Policies\System\EnableLUA = "0"	ab7307731f5026b64631fe11b117e29ed3a4c851df388238048b6370bb99fee0N.exe
Key value queried	\REGISTRY\MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Policies\System\EnableLUA	winlogon.exe
Set value (int)	\REGISTRY\MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Policies\System\EnableLUA = "0"	winlogon.exe

Drops file in Program Files directory 9 IoCs

description	ioc	Process
File created	C:\Program Files\Google\1df779c366e423	ab7307731f5026b64631fe11b117e29ed3a4c851df388238048b6370bb99fee0N.exe
File created	C:\Program Files\Uninstall Information\dllhost.exe	ab7307731f5026b64631fe11b117e29ed3a4c851df388238048b6370bb99fee0N.exe
File created	C:\Program Files\Uninstall Information\5940a34987c991	ab7307731f5026b64631fe11b117e29ed3a4c851df388238048b6370bb99fee0N.exe
File created	C:\Program Files (x86)\Windows Sidebar\winlogon.exe	ab7307731f5026b64631fe11b117e29ed3a4c851df388238048b6370bb99fee0N.exe
File created	C:\Program Files (x86)\Windows Sidebar\cc11b995f2a76d	ab7307731f5026b64631fe11b117e29ed3a4c851df388238048b6370bb99fee0N.exe
File opened for modification	C:\Program Files\Java\RuntimeBroker.exe	ab7307731f5026b64631fe11b117e29ed3a4c851df388238048b6370bb99fee0N.exe
File created	C:\Program Files\Java\9e8d7a4ca61bd9	ab7307731f5026b64631fe11b117e29ed3a4c851df388238048b6370bb99fee0N.exe
File created	C:\Program Files\Google\ab7307731f5026b64631fe11b117e29ed3a4c851df388238048b6370bb99fee0N.exe	ab7307731f5026b64631fe11b117e29ed3a4c851df388238048b6370bb99fee0N.exe
File created	C:\Program Files\Java\RuntimeBroker.exe	ab7307731f5026b64631fe11b117e29ed3a4c851df388238048b6370bb99fee0N.exe

Drops file in Windows directory 1 IoCs

description	ioc	Process
File created	C:\Windows\WinSxS\amd64_microsoft-windows-ie-imagesupport_31bf3856ad364e35_11.0.19041.746_none_5fa627937b52585b\winlogon.exe	ab7307731f5026b64631fe11b117e29ed3a4c851df388238048b6370bb99fee0N.exe

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

System Information Discovery
T1082

Scheduled Task/Job: Scheduled Task 1 TTPs 15 IoCs

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

persistence execution

Scheduled Task

T1053.005

pid	Process
2532	schtasks.exe
1340	schtasks.exe
928	schtasks.exe
3968	schtasks.exe
748	schtasks.exe
3660	schtasks.exe
3248	schtasks.exe
596	schtasks.exe
1764	schtasks.exe
2244	schtasks.exe
2460	schtasks.exe
2056	schtasks.exe
4312	schtasks.exe
3812	schtasks.exe
3868	schtasks.exe

Suspicious behavior: EnumeratesProcesses 2 IoCs

pid	Process
4828	ab7307731f5026b64631fe11b117e29ed3a4c851df388238048b6370bb99fee0N.exe
1592	winlogon.exe

Suspicious use of AdjustPrivilegeToken 2 IoCs

description	pid	Process
Token: SeDebugPrivilege	4828	ab7307731f5026b64631fe11b117e29ed3a4c851df388238048b6370bb99fee0N.exe
Token: SeDebugPrivilege	1592	winlogon.exe

Suspicious use of WriteProcessMemory 2 IoCs

description	pid	Process	procid_target
PID 4828 wrote to memory of 1592	4828	ab7307731f5026b64631fe11b117e29ed3a4c851df388238048b6370bb99fee0N.exe	104
PID 4828 wrote to memory of 1592	4828	ab7307731f5026b64631fe11b117e29ed3a4c851df388238048b6370bb99fee0N.exe	104

System policy modification 1 TTPs 6 IoCs

evasion

Modify Registry

T1112

description	ioc	Process
Set value (int)	\REGISTRY\MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Policies\System\EnableLUA = "0"	ab7307731f5026b64631fe11b117e29ed3a4c851df388238048b6370bb99fee0N.exe
Set value (int)	\REGISTRY\MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Policies\System\ConsentPromptBehaviorAdmin = "0"	ab7307731f5026b64631fe11b117e29ed3a4c851df388238048b6370bb99fee0N.exe
Set value (int)	\REGISTRY\MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Policies\System\PromptOnSecureDesktop = "0"	ab7307731f5026b64631fe11b117e29ed3a4c851df388238048b6370bb99fee0N.exe
Set value (int)	\REGISTRY\MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Policies\System\EnableLUA = "0"	winlogon.exe
Set value (int)	\REGISTRY\MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Policies\System\ConsentPromptBehaviorAdmin = "0"	winlogon.exe
Set value (int)	\REGISTRY\MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Policies\System\PromptOnSecureDesktop = "0"	winlogon.exe

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\ab7307731f5026b64631fe11b117e29ed3a4c851df388238048b6370bb99fee0N.exe
"C:\Users\Admin\AppData\Local\Temp\ab7307731f5026b64631fe11b117e29ed3a4c851df388238048b6370bb99fee0N.exe"
1⤵
- UAC bypass
- Checks computer location settings
- Checks whether UAC is enabled
- Drops file in Program Files directory
- Drops file in Windows directory
- Suspicious behavior: EnumeratesProcesses
- Suspicious use of AdjustPrivilegeToken
- Suspicious use of WriteProcessMemory
- System policy modification
PID:4828
- C:\Program Files (x86)\Windows Sidebar\winlogon.exe
  "C:\Program Files (x86)\Windows Sidebar\winlogon.exe"
  2⤵
  - UAC bypass
  - Executes dropped EXE
  - Checks whether UAC is enabled
  - Suspicious behavior: EnumeratesProcesses
  - Suspicious use of AdjustPrivilegeToken
  - System policy modification
  PID:1592

C:\Windows\system32\schtasks.exe
schtasks.exe /create /tn "RuntimeBrokerR" /sc MINUTE /mo 13 /tr "'C:\Program Files\Java\RuntimeBroker.exe'" /f
1⤵
- Process spawned unexpected child process
- Scheduled Task/Job: Scheduled Task
PID:3248

C:\Windows\system32\schtasks.exe
schtasks.exe /create /tn "RuntimeBroker" /sc ONLOGON /tr "'C:\Program Files\Java\RuntimeBroker.exe'" /rl HIGHEST /f
1⤵
- Process spawned unexpected child process
- Scheduled Task/Job: Scheduled Task
PID:2532

C:\Windows\system32\schtasks.exe
schtasks.exe /create /tn "RuntimeBrokerR" /sc MINUTE /mo 14 /tr "'C:\Program Files\Java\RuntimeBroker.exe'" /rl HIGHEST /f
1⤵
- Process spawned unexpected child process
- Scheduled Task/Job: Scheduled Task
PID:4312

C:\Windows\system32\schtasks.exe
schtasks.exe /create /tn "ab7307731f5026b64631fe11b117e29ed3a4c851df388238048b6370bb99fee0Na" /sc MINUTE /mo 7 /tr "'C:\Program Files\Google\ab7307731f5026b64631fe11b117e29ed3a4c851df388238048b6370bb99fee0N.exe'" /f
1⤵
- Process spawned unexpected child process
- Scheduled Task/Job: Scheduled Task
PID:1340

C:\Windows\system32\schtasks.exe
schtasks.exe /create /tn "ab7307731f5026b64631fe11b117e29ed3a4c851df388238048b6370bb99fee0N" /sc ONLOGON /tr "'C:\Program Files\Google\ab7307731f5026b64631fe11b117e29ed3a4c851df388238048b6370bb99fee0N.exe'" /rl HIGHEST /f
1⤵
- Process spawned unexpected child process
- Scheduled Task/Job: Scheduled Task
PID:2460

C:\Windows\system32\schtasks.exe
schtasks.exe /create /tn "ab7307731f5026b64631fe11b117e29ed3a4c851df388238048b6370bb99fee0Na" /sc MINUTE /mo 6 /tr "'C:\Program Files\Google\ab7307731f5026b64631fe11b117e29ed3a4c851df388238048b6370bb99fee0N.exe'" /rl HIGHEST /f
1⤵
- Process spawned unexpected child process
- Scheduled Task/Job: Scheduled Task
PID:596

C:\Windows\system32\schtasks.exe
schtasks.exe /create /tn "dllhostd" /sc MINUTE /mo 13 /tr "'C:\Program Files\Uninstall Information\dllhost.exe'" /f
1⤵
- Process spawned unexpected child process
- Scheduled Task/Job: Scheduled Task
PID:3812

C:\Windows\system32\schtasks.exe
schtasks.exe /create /tn "dllhost" /sc ONLOGON /tr "'C:\Program Files\Uninstall Information\dllhost.exe'" /rl HIGHEST /f
1⤵
- Process spawned unexpected child process
- Scheduled Task/Job: Scheduled Task
PID:1764

C:\Windows\system32\schtasks.exe
schtasks.exe /create /tn "dllhostd" /sc MINUTE /mo 5 /tr "'C:\Program Files\Uninstall Information\dllhost.exe'" /rl HIGHEST /f
1⤵
- Process spawned unexpected child process
- Scheduled Task/Job: Scheduled Task
PID:928

C:\Windows\system32\schtasks.exe
schtasks.exe /create /tn "winlogonw" /sc MINUTE /mo 10 /tr "'C:\Program Files (x86)\Windows Sidebar\winlogon.exe'" /f
1⤵
- Process spawned unexpected child process
- Scheduled Task/Job: Scheduled Task
PID:3868

C:\Windows\system32\schtasks.exe
schtasks.exe /create /tn "winlogon" /sc ONLOGON /tr "'C:\Program Files (x86)\Windows Sidebar\winlogon.exe'" /rl HIGHEST /f
1⤵
- Process spawned unexpected child process
- Scheduled Task/Job: Scheduled Task
PID:3968

C:\Windows\system32\schtasks.exe
schtasks.exe /create /tn "winlogonw" /sc MINUTE /mo 12 /tr "'C:\Program Files (x86)\Windows Sidebar\winlogon.exe'" /rl HIGHEST /f
1⤵
- Process spawned unexpected child process
- Scheduled Task/Job: Scheduled Task
PID:2244

C:\Windows\system32\schtasks.exe
schtasks.exe /create /tn "smsss" /sc MINUTE /mo 8 /tr "'C:\Recovery\WindowsRE\smss.exe'" /f
1⤵
- Process spawned unexpected child process
- Scheduled Task/Job: Scheduled Task
PID:2056

C:\Windows\system32\schtasks.exe
schtasks.exe /create /tn "smss" /sc ONLOGON /tr "'C:\Recovery\WindowsRE\smss.exe'" /rl HIGHEST /f
1⤵
- Process spawned unexpected child process
- Scheduled Task/Job: Scheduled Task
PID:748

C:\Windows\system32\schtasks.exe
schtasks.exe /create /tn "smsss" /sc MINUTE /mo 11 /tr "'C:\Recovery\WindowsRE\smss.exe'" /rl HIGHEST /f
1⤵
- Process spawned unexpected child process
- Scheduled Task/Job: Scheduled Task
PID:3660

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

Abuse Elevation Control Mechanism

1

T1548

Bypass User Account Control

1

T1548.002

Scheduled Task/Job

1

T1053

Scheduled Task

1

T1053.005

Defense Evasion

Abuse Elevation Control Mechanism

1

T1548

Bypass User Account Control

1

T1548.002

Impair Defenses

1

T1562

Disable or Modify Tools

Modify Registry

Credential Access

Discovery

Query Registry

2

T1012

System Information Discovery

3

T1082

Lateral Movement

Collection

Command and Control

Exfiltration

Impact

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Downloads

C:\Recovery\WindowsRE\smss.exe

Filesize
1.6MB

MD5
8ce0a9103ab10fed54094a3a2d1146e0

SHA1
4aef0ddaa8d065170c0ff2cc099c31aa6b1085aa

SHA256
ab7307731f5026b64631fe11b117e29ed3a4c851df388238048b6370bb99fee0

SHA512
cf0adcb740f1eec83e6477bc487cf3a0d152222e08f186b78a674e0e9178b591e7088c5a2d2763dbd6eed55e3eef2bbdfaddf1791158e7dad7c891577f71e76f

Download Submit
memory/4828-8-0x000000001AE90000-0x000000001AE9C000-memory.dmp

Filesize
48KB

Download
memory/4828-11-0x000000001AF20000-0x000000001AF32000-memory.dmp

Filesize
72KB

Download
memory/4828-3-0x000000001AE30000-0x000000001AE4C000-memory.dmp

Filesize
112KB

Download
memory/4828-6-0x000000001AE70000-0x000000001AE80000-memory.dmp

Filesize
64KB

Download
memory/4828-5-0x000000001AE50000-0x000000001AE66000-memory.dmp

Filesize
88KB

Download
memory/4828-4-0x000000001AEA0000-0x000000001AEF0000-memory.dmp

Filesize
320KB

Download
memory/4828-7-0x000000001AE80000-0x000000001AE8A000-memory.dmp

Filesize
40KB

Download
memory/4828-0-0x00007FF95AA93000-0x00007FF95AA95000-memory.dmp

Filesize
8KB

Download
memory/4828-2-0x00007FF95AA90000-0x00007FF95B551000-memory.dmp

Filesize
10.8MB

Download
memory/4828-10-0x000000001AF00000-0x000000001AF0C000-memory.dmp

Filesize
48KB

Download
memory/4828-9-0x000000001AEF0000-0x000000001AEF8000-memory.dmp

Filesize
32KB

Download
memory/4828-12-0x000000001BC10000-0x000000001C138000-memory.dmp

Filesize
5.2MB

Download
memory/4828-13-0x000000001AF50000-0x000000001AF5E000-memory.dmp

Filesize
56KB

Download
memory/4828-15-0x000000001AF70000-0x000000001AF7A000-memory.dmp

Filesize
40KB

Download
memory/4828-14-0x000000001AF60000-0x000000001AF68000-memory.dmp

Filesize
32KB

Download
memory/4828-16-0x000000001AF80000-0x000000001AF8C000-memory.dmp

Filesize
48KB

Download
memory/4828-1-0x00000000001A0000-0x0000000000340000-memory.dmp

Filesize
1.6MB

Download
memory/4828-38-0x00007FF95AA90000-0x00007FF95B551000-memory.dmp

Filesize
10.8MB

Download

Analysis

Sharing

General

Malware Config

Signatures

Processes

Network

MITRE ATT&CK Enterprise v15

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Downloads