dcrat | 85768ff86e86155faadff2443ea1c9656fc479ffa5f0ae90c9b738bf31ff1080

General

Target

3E30BD01F2053EE82162F5ECA0FAEFE8.exe
Size

1.3MB
MD5

3e30bd01f2053ee82162f5eca0faefe8
SHA1

e5859be6a67c8d33a34707df9c13c8ddce6cc690
SHA256

85768ff86e86155faadff2443ea1c9656fc479ffa5f0ae90c9b738bf31ff1080
SHA512

ede7e3f18f0add3744b64955744067654a147e2f4dc33d7d4b9e82d02c7698ea3654ea4623a424729f1e6528314049e102aa2f74b223b16638276e758c5bb9e5
SSDEEP

24576:A3HWfVXWNnnOtB3c20/vtKMpw7fuWppvKoxdO3zFuI:g2fWnnwa2qhcN/5xM

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 9 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	4604	4116	schtasks.exe	83
Parent C:\Windows\system32\wbem\wmiprvse.exe is not expected to spawn this process	3492	4116	schtasks.exe	83
Parent C:\Windows\system32\wbem\wmiprvse.exe is not expected to spawn this process	2916	4116	schtasks.exe	83
Parent C:\Windows\system32\wbem\wmiprvse.exe is not expected to spawn this process	4324	4116	schtasks.exe	83
Parent C:\Windows\system32\wbem\wmiprvse.exe is not expected to spawn this process	4348	4116	schtasks.exe	83
Parent C:\Windows\system32\wbem\wmiprvse.exe is not expected to spawn this process	2932	4116	schtasks.exe	83
Parent C:\Windows\system32\wbem\wmiprvse.exe is not expected to spawn this process	396	4116	schtasks.exe	83
Parent C:\Windows\system32\wbem\wmiprvse.exe is not expected to spawn this process	4912	4116	schtasks.exe	83
Parent C:\Windows\system32\wbem\wmiprvse.exe is not expected to spawn this process	2936	4116	schtasks.exe	83

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\PromptOnSecureDesktop = "0"	Idle.exe
Set value (int)	\REGISTRY\MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Policies\System\EnableLUA = "0"	3E30BD01F2053EE82162F5ECA0FAEFE8.exe
Set value (int)	\REGISTRY\MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Policies\System\ConsentPromptBehaviorAdmin = "0"	3E30BD01F2053EE82162F5ECA0FAEFE8.exe
Set value (int)	\REGISTRY\MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Policies\System\PromptOnSecureDesktop = "0"	3E30BD01F2053EE82162F5ECA0FAEFE8.exe
Set value (int)	\REGISTRY\MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Policies\System\EnableLUA = "0"	Idle.exe
Set value (int)	\REGISTRY\MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Policies\System\ConsentPromptBehaviorAdmin = "0"	Idle.exe

DCRat payload 2 IoCs

Detects payload of DCRat, commonly dropped by NSIS installers.

rat

resource	yara_rule
behavioral2/memory/3672-1-0x0000000000950000-0x0000000000A9A000-memory.dmp	dcrat
behavioral2/files/0x0007000000023c69-21.dat	dcrat

Checks computer location settings 2 TTPs 2 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-1-5-21-3350944739-639801879-157714471-1000\Control Panel\International\Geo\Nation	3E30BD01F2053EE82162F5ECA0FAEFE8.exe
Key value queried	\REGISTRY\USER\S-1-5-21-3350944739-639801879-157714471-1000\Control Panel\International\Geo\Nation	Idle.exe

Executes dropped EXE 1 IoCs

pid	Process
4692	Idle.exe

Checks whether UAC is enabled 1 TTPs 4 IoCs

evasion trojan

System Information Discovery

T1082

description	ioc	Process
Set value (int)	\REGISTRY\MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Policies\System\EnableLUA = "0"	3E30BD01F2053EE82162F5ECA0FAEFE8.exe
Key value queried	\REGISTRY\MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Policies\System\EnableLUA	Idle.exe
Set value (int)	\REGISTRY\MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Policies\System\EnableLUA = "0"	Idle.exe
Key value queried	\REGISTRY\MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Policies\System\EnableLUA	3E30BD01F2053EE82162F5ECA0FAEFE8.exe

Looks up external IP address via web service 3 IoCs

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

flow	ioc
3	ip-api.com
23	ipinfo.io
24	ipinfo.io

Drops file in Program Files directory 2 IoCs

description	ioc	Process
File created	C:\Program Files (x86)\Google\Update\1.3.36.371\Idle.exe	3E30BD01F2053EE82162F5ECA0FAEFE8.exe
File created	C:\Program Files (x86)\Google\Update\1.3.36.371\6ccacd8608530f	3E30BD01F2053EE82162F5ECA0FAEFE8.exe

Drops file in Windows directory 2 IoCs

description	ioc	Process
File created	C:\Windows\Branding\Basebrd\es-ES\csrss.exe	3E30BD01F2053EE82162F5ECA0FAEFE8.exe
File created	C:\Windows\Branding\Basebrd\es-ES\886983d96e3d3e	3E30BD01F2053EE82162F5ECA0FAEFE8.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-1-5-21-3350944739-639801879-157714471-1000_Classes\Local Settings	Idle.exe

Scheduled Task/Job: Scheduled Task 1 TTPs 9 IoCs

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

persistence execution

Scheduled Task

T1053.005

pid	Process
4324	schtasks.exe
4348	schtasks.exe
4912	schtasks.exe
2936	schtasks.exe
4604	schtasks.exe
3492	schtasks.exe
2916	schtasks.exe
2932	schtasks.exe
396	schtasks.exe

Suspicious behavior: EnumeratesProcesses 14 IoCs

pid	Process
3672	3E30BD01F2053EE82162F5ECA0FAEFE8.exe
3672	3E30BD01F2053EE82162F5ECA0FAEFE8.exe
4692	Idle.exe
4692	Idle.exe
4692	Idle.exe
4692	Idle.exe
4692	Idle.exe
4692	Idle.exe
4692	Idle.exe
4692	Idle.exe
4692	Idle.exe
4692	Idle.exe
4692	Idle.exe
4692	Idle.exe

Suspicious behavior: GetForegroundWindowSpam 1 IoCs

pid	Process
4692	Idle.exe

Suspicious use of AdjustPrivilegeToken 2 IoCs

description	pid	Process
Token: SeDebugPrivilege	3672	3E30BD01F2053EE82162F5ECA0FAEFE8.exe
Token: SeDebugPrivilege	4692	Idle.exe

Suspicious use of WriteProcessMemory 6 IoCs

description	pid	Process	procid_target
PID 3672 wrote to memory of 4692	3672	3E30BD01F2053EE82162F5ECA0FAEFE8.exe	93
PID 3672 wrote to memory of 4692	3672	3E30BD01F2053EE82162F5ECA0FAEFE8.exe	93
PID 4692 wrote to memory of 316	4692	Idle.exe	96
PID 4692 wrote to memory of 316	4692	Idle.exe	96
PID 4692 wrote to memory of 4744	4692	Idle.exe	97
PID 4692 wrote to memory of 4744	4692	Idle.exe	97

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"	Idle.exe
Set value (int)	\REGISTRY\MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Policies\System\ConsentPromptBehaviorAdmin = "0"	Idle.exe
Set value (int)	\REGISTRY\MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Policies\System\PromptOnSecureDesktop = "0"	Idle.exe
Set value (int)	\REGISTRY\MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Policies\System\EnableLUA = "0"	3E30BD01F2053EE82162F5ECA0FAEFE8.exe
Set value (int)	\REGISTRY\MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Policies\System\ConsentPromptBehaviorAdmin = "0"	3E30BD01F2053EE82162F5ECA0FAEFE8.exe
Set value (int)	\REGISTRY\MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Policies\System\PromptOnSecureDesktop = "0"	3E30BD01F2053EE82162F5ECA0FAEFE8.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\3E30BD01F2053EE82162F5ECA0FAEFE8.exe
"C:\Users\Admin\AppData\Local\Temp\3E30BD01F2053EE82162F5ECA0FAEFE8.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:3672
- C:\Program Files (x86)\Google\Update\1.3.36.371\Idle.exe
  "C:\Program Files (x86)\Google\Update\1.3.36.371\Idle.exe"
  2⤵
  - UAC bypass
  - Checks computer location settings
  - Executes dropped EXE
  - Checks whether UAC is enabled
  - Modifies registry class
  - Suspicious behavior: EnumeratesProcesses
  - Suspicious behavior: GetForegroundWindowSpam
  - Suspicious use of AdjustPrivilegeToken
  - Suspicious use of WriteProcessMemory
  - System policy modification
  PID:4692
- - C:\Windows\System32\WScript.exe
    "C:\Windows\System32\WScript.exe" "C:\Users\Admin\AppData\Local\Temp\8a03ef14-b039-4020-a79d-e7246a035a83.vbs"
    3⤵
    PID:316
- - C:\Windows\System32\WScript.exe
    "C:\Windows\System32\WScript.exe" "C:\Users\Admin\AppData\Local\Temp\2145f382-24d0-4ba1-bdbf-915a93786a03.vbs"
    3⤵
    PID:4744

C:\Windows\system32\schtasks.exe
schtasks.exe /create /tn "IdleI" /sc MINUTE /mo 14 /tr "'C:\Recovery\WindowsRE\Idle.exe'" /f
1⤵
- Process spawned unexpected child process
- Scheduled Task/Job: Scheduled Task
PID:4604

C:\Windows\system32\schtasks.exe
schtasks.exe /create /tn "Idle" /sc ONLOGON /tr "'C:\Recovery\WindowsRE\Idle.exe'" /rl HIGHEST /f
1⤵
- Process spawned unexpected child process
- Scheduled Task/Job: Scheduled Task
PID:3492

C:\Windows\system32\schtasks.exe
schtasks.exe /create /tn "IdleI" /sc MINUTE /mo 6 /tr "'C:\Recovery\WindowsRE\Idle.exe'" /rl HIGHEST /f
1⤵
- Process spawned unexpected child process
- Scheduled Task/Job: Scheduled Task
PID:2916

C:\Windows\system32\schtasks.exe
schtasks.exe /create /tn "csrssc" /sc MINUTE /mo 8 /tr "'C:\Windows\Branding\Basebrd\es-ES\csrss.exe'" /f
1⤵
- Process spawned unexpected child process
- Scheduled Task/Job: Scheduled Task
PID:4324

C:\Windows\system32\schtasks.exe
schtasks.exe /create /tn "csrss" /sc ONLOGON /tr "'C:\Windows\Branding\Basebrd\es-ES\csrss.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 "csrssc" /sc MINUTE /mo 7 /tr "'C:\Windows\Branding\Basebrd\es-ES\csrss.exe'" /rl HIGHEST /f
1⤵
- Process spawned unexpected child process
- Scheduled Task/Job: Scheduled Task
PID:2932

C:\Windows\system32\schtasks.exe
schtasks.exe /create /tn "IdleI" /sc MINUTE /mo 6 /tr "'C:\Program Files (x86)\Google\Update\1.3.36.371\Idle.exe'" /f
1⤵
- Process spawned unexpected child process
- Scheduled Task/Job: Scheduled Task
PID:396

C:\Windows\system32\schtasks.exe
schtasks.exe /create /tn "Idle" /sc ONLOGON /tr "'C:\Program Files (x86)\Google\Update\1.3.36.371\Idle.exe'" /rl HIGHEST /f
1⤵
- Process spawned unexpected child process
- Scheduled Task/Job: Scheduled Task
PID:4912

C:\Windows\system32\schtasks.exe
schtasks.exe /create /tn "IdleI" /sc MINUTE /mo 12 /tr "'C:\Program Files (x86)\Google\Update\1.3.36.371\Idle.exe'" /rl HIGHEST /f
1⤵
- Process spawned unexpected child process
- Scheduled Task/Job: Scheduled Task
PID:2936

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:\Program Files (x86)\Google\Update\1.3.36.371\Idle.exe

Filesize
1.3MB

MD5
3e30bd01f2053ee82162f5eca0faefe8

SHA1
e5859be6a67c8d33a34707df9c13c8ddce6cc690

SHA256
85768ff86e86155faadff2443ea1c9656fc479ffa5f0ae90c9b738bf31ff1080

SHA512
ede7e3f18f0add3744b64955744067654a147e2f4dc33d7d4b9e82d02c7698ea3654ea4623a424729f1e6528314049e102aa2f74b223b16638276e758c5bb9e5

Download Submit
C:\Users\Admin\AppData\Local\Temp\2145f382-24d0-4ba1-bdbf-915a93786a03.vbs

Filesize
508B

MD5
189090147c6a610153235018f0a80d9a

SHA1
e72d2f05e63ba07aec240fe6fbc32d425919462a

SHA256
a4e0f9f9ca66e26464effc3843707fa2f2bc347152f55b800d52186e0df17301

SHA512
1a1aff3a598fa97ac4f02f75c9263548dcb98c3b4db44abb4cb6ce31bf493e6ffafa9246d81ab761f2fafe7da7cf2fdf496883200def8a054092fd1ef1067da9

Download Submit
C:\Users\Admin\AppData\Local\Temp\8a03ef14-b039-4020-a79d-e7246a035a83.vbs

Filesize
732B

MD5
47b3b37cc893e0f40592aed9f4cd572f

SHA1
94a61a37d44fe95b7d86a867acba68cc38a8dbe6

SHA256
60d7270876cb66860839f015079aec442550ac752f519ae65a2fac6c28d44f33

SHA512
127476d91c3150ce870530813b85c431a93c0f2e2cb27898ab3861d9e79afbd9274a5f0746126c6cbb5ddca355c965c62175bdcc090a6f6042f728f26bd91c4f

Download Submit
memory/3672-10-0x0000000002C50000-0x0000000002C5A000-memory.dmp

Filesize
40KB

Download
memory/3672-12-0x0000000002C70000-0x0000000002C7E000-memory.dmp

Filesize
56KB

Download
memory/3672-5-0x0000000002B80000-0x0000000002B88000-memory.dmp

Filesize
32KB

Download
memory/3672-6-0x0000000002BE0000-0x0000000002BE8000-memory.dmp

Filesize
32KB

Download
memory/3672-7-0x0000000002C20000-0x0000000002C2A000-memory.dmp

Filesize
40KB

Download
memory/3672-8-0x0000000002C30000-0x0000000002C3C000-memory.dmp

Filesize
48KB

Download
memory/3672-9-0x0000000002C40000-0x0000000002C4C000-memory.dmp

Filesize
48KB

Download
memory/3672-0-0x00007FFBC48C3000-0x00007FFBC48C5000-memory.dmp

Filesize
8KB

Download
memory/3672-11-0x0000000002C60000-0x0000000002C6E000-memory.dmp

Filesize
56KB

Download
memory/3672-4-0x0000000001270000-0x000000000127E000-memory.dmp

Filesize
56KB

Download
memory/3672-13-0x0000000002C80000-0x0000000002C88000-memory.dmp

Filesize
32KB

Download
memory/3672-3-0x0000000001260000-0x000000000126E000-memory.dmp

Filesize
56KB

Download
memory/3672-31-0x00007FFBC48C0000-0x00007FFBC5381000-memory.dmp

Filesize
10.8MB

Download
memory/3672-2-0x00007FFBC48C0000-0x00007FFBC5381000-memory.dmp

Filesize
10.8MB

Download
memory/3672-1-0x0000000000950000-0x0000000000A9A000-memory.dmp

Filesize
1.3MB

Download
memory/4692-41-0x000000001D6C0000-0x000000001D882000-memory.dmp

Filesize
1.8MB

Download
memory/4692-42-0x000000001DFC0000-0x000000001E4E8000-memory.dmp

Filesize
5.2MB

Download
memory/4692-43-0x000000001D5F0000-0x000000001D698000-memory.dmp

Filesize
672KB

Download

Analysis

Sharing

General

Malware Config

Signatures

Processes

Network

MITRE ATT&CK Enterprise v15

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Downloads