dcrat | 8bc4ca0ef9348f4a331f850af113f2134c0aba41f6a1e9dd26f9b34db34b473b

General

Target

8bc4ca0ef9348f4a331f850af113f2134c0aba41f6a1e9dd26f9b34db34b473b.exe
Size

2.0MB
MD5

0707542d6d884c5c595b38ebedd025c9
SHA1

686f867f37c8aca23ea3cc298dec856667c1afcd
SHA256

8bc4ca0ef9348f4a331f850af113f2134c0aba41f6a1e9dd26f9b34db34b473b
SHA512

945eeeadb00c19934d034cfb9bd158246e2fcb989bb8808ce3fffee7707cc4ae1f83310db961ecfbd0bc99304b8c041ec7e4ee83893d1db7eac54910970cccc0
SSDEEP

49152:fA6rKdfybQlb8Em0lP/PHNQsGE6+tlcwDXbuvDtkI:XrKngUlPtQsG831burKI

Score

10^/10

dcrat infostealer persistence 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 6 IoCs

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

Processes:

schtasks.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	1932	2380	schtasks.exe	31
Parent C:\Windows\system32\wbem\wmiprvse.exe is not expected to spawn this process	1472	2380	schtasks.exe	31
Parent C:\Windows\system32\wbem\wmiprvse.exe is not expected to spawn this process	2816	2380	schtasks.exe	31
Parent C:\Windows\system32\wbem\wmiprvse.exe is not expected to spawn this process	2984	2380	schtasks.exe	31
Parent C:\Windows\system32\wbem\wmiprvse.exe is not expected to spawn this process	2736	2380	schtasks.exe	31
Parent C:\Windows\system32\wbem\wmiprvse.exe is not expected to spawn this process	2932	2380	schtasks.exe	31

DCRat payload 3 IoCs

Detects payload of DCRat, commonly dropped by NSIS installers.

rat

Processes:

resource	yara_rule
behavioral1/memory/2316-1-0x0000000000F10000-0x0000000001122000-memory.dmp	dcrat
behavioral1/files/0x000500000001924c-11.dat	dcrat
behavioral1/memory/2712-21-0x0000000001070000-0x0000000001282000-memory.dmp	dcrat

Executes dropped EXE 1 IoCs

Processes:

csrss.exe

pid	Process
2712	csrss.exe

Adds Run key to start application 2 TTPs 6 IoCs

persistence

Registry Run Keys / Startup Folder

T1547.001

Modify Registry

T1112

Processes:

8bc4ca0ef9348f4a331f850af113f2134c0aba41f6a1e9dd26f9b34db34b473b.exe

description	ioc	Process
Set value (str)	\REGISTRY\MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Run\Idle = "\"C:\\Program Files (x86)\\Reference Assemblies\\Microsoft\\Framework\\v3.5\\fr\\Idle.exe\""	8bc4ca0ef9348f4a331f850af113f2134c0aba41f6a1e9dd26f9b34db34b473b.exe
Set value (str)	\REGISTRY\MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Run\OSPPSVC = "\"C:\\Program Files\\Common Files\\Microsoft Shared\\OfficeSoftwareProtectionPlatform\\OSPPC\\OSPPSVC.exe\""	8bc4ca0ef9348f4a331f850af113f2134c0aba41f6a1e9dd26f9b34db34b473b.exe
Set value (str)	\REGISTRY\MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Run\csrss = "\"C:\\ProgramData\\Templates\\csrss.exe\""	8bc4ca0ef9348f4a331f850af113f2134c0aba41f6a1e9dd26f9b34db34b473b.exe
Set value (str)	\REGISTRY\MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Run\csrss = "\"C:\\Windows\\System32\\gcdef\\csrss.exe\""	8bc4ca0ef9348f4a331f850af113f2134c0aba41f6a1e9dd26f9b34db34b473b.exe
Set value (str)	\REGISTRY\MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Run\dllhost = "\"C:\\Windows\\System32\\KBDBE\\dllhost.exe\""	8bc4ca0ef9348f4a331f850af113f2134c0aba41f6a1e9dd26f9b34db34b473b.exe
Set value (str)	\REGISTRY\MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Run\explorer = "\"C:\\Users\\Admin\\Local Settings\\explorer.exe\""	8bc4ca0ef9348f4a331f850af113f2134c0aba41f6a1e9dd26f9b34db34b473b.exe

Drops file in System32 directory 4 IoCs

Processes:

8bc4ca0ef9348f4a331f850af113f2134c0aba41f6a1e9dd26f9b34db34b473b.exe

description	ioc	Process
File created	C:\Windows\System32\KBDBE\dllhost.exe	8bc4ca0ef9348f4a331f850af113f2134c0aba41f6a1e9dd26f9b34db34b473b.exe
File created	C:\Windows\System32\KBDBE\5940a34987c99120d96dace90a3f93f329dcad63	8bc4ca0ef9348f4a331f850af113f2134c0aba41f6a1e9dd26f9b34db34b473b.exe
File created	C:\Windows\System32\gcdef\csrss.exe	8bc4ca0ef9348f4a331f850af113f2134c0aba41f6a1e9dd26f9b34db34b473b.exe
File created	C:\Windows\System32\gcdef\886983d96e3d3e31032c679b2d4ea91b6c05afef	8bc4ca0ef9348f4a331f850af113f2134c0aba41f6a1e9dd26f9b34db34b473b.exe

Drops file in Program Files directory 5 IoCs

Processes:

8bc4ca0ef9348f4a331f850af113f2134c0aba41f6a1e9dd26f9b34db34b473b.exe

description	ioc	Process
File created	C:\Program Files (x86)\Reference Assemblies\Microsoft\Framework\v3.5\fr\Idle.exe	8bc4ca0ef9348f4a331f850af113f2134c0aba41f6a1e9dd26f9b34db34b473b.exe
File opened for modification	C:\Program Files (x86)\Reference Assemblies\Microsoft\Framework\v3.5\fr\Idle.exe	8bc4ca0ef9348f4a331f850af113f2134c0aba41f6a1e9dd26f9b34db34b473b.exe
File created	C:\Program Files (x86)\Reference Assemblies\Microsoft\Framework\v3.5\fr\6ccacd8608530fba3a93e87ae2225c7032aa18c1	8bc4ca0ef9348f4a331f850af113f2134c0aba41f6a1e9dd26f9b34db34b473b.exe
File created	C:\Program Files\Common Files\Microsoft Shared\OfficeSoftwareProtectionPlatform\OSPPC\OSPPSVC.exe	8bc4ca0ef9348f4a331f850af113f2134c0aba41f6a1e9dd26f9b34db34b473b.exe
File created	C:\Program Files\Common Files\Microsoft Shared\OfficeSoftwareProtectionPlatform\OSPPC\1610b97d3ab4a74cd8ae104b51bea7bfcc5b9c6f	8bc4ca0ef9348f4a331f850af113f2134c0aba41f6a1e9dd26f9b34db34b473b.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 6 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.exe

pid	Process
2932	schtasks.exe
1932	schtasks.exe
1472	schtasks.exe
2816	schtasks.exe
2984	schtasks.exe
2736	schtasks.exe

Suspicious behavior: EnumeratesProcesses 6 IoCs

Processes:

8bc4ca0ef9348f4a331f850af113f2134c0aba41f6a1e9dd26f9b34db34b473b.execsrss.exe

pid	Process
2316	8bc4ca0ef9348f4a331f850af113f2134c0aba41f6a1e9dd26f9b34db34b473b.exe
2316	8bc4ca0ef9348f4a331f850af113f2134c0aba41f6a1e9dd26f9b34db34b473b.exe
2316	8bc4ca0ef9348f4a331f850af113f2134c0aba41f6a1e9dd26f9b34db34b473b.exe
2316	8bc4ca0ef9348f4a331f850af113f2134c0aba41f6a1e9dd26f9b34db34b473b.exe
2316	8bc4ca0ef9348f4a331f850af113f2134c0aba41f6a1e9dd26f9b34db34b473b.exe
2712	csrss.exe

Suspicious use of AdjustPrivilegeToken 2 IoCs

Processes:

8bc4ca0ef9348f4a331f850af113f2134c0aba41f6a1e9dd26f9b34db34b473b.execsrss.exe

description	pid	Process
Token: SeDebugPrivilege	2316	8bc4ca0ef9348f4a331f850af113f2134c0aba41f6a1e9dd26f9b34db34b473b.exe
Token: SeDebugPrivilege	2712	csrss.exe

Suspicious use of WriteProcessMemory 3 IoCs

Processes:

8bc4ca0ef9348f4a331f850af113f2134c0aba41f6a1e9dd26f9b34db34b473b.exe

description	pid	Process	procid_target
PID 2316 wrote to memory of 2712	2316	8bc4ca0ef9348f4a331f850af113f2134c0aba41f6a1e9dd26f9b34db34b473b.exe	38
PID 2316 wrote to memory of 2712	2316	8bc4ca0ef9348f4a331f850af113f2134c0aba41f6a1e9dd26f9b34db34b473b.exe	38
PID 2316 wrote to memory of 2712	2316	8bc4ca0ef9348f4a331f850af113f2134c0aba41f6a1e9dd26f9b34db34b473b.exe	38

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\8bc4ca0ef9348f4a331f850af113f2134c0aba41f6a1e9dd26f9b34db34b473b.exe
"C:\Users\Admin\AppData\Local\Temp\8bc4ca0ef9348f4a331f850af113f2134c0aba41f6a1e9dd26f9b34db34b473b.exe"
1⤵
- Adds Run key to start application
- Drops file in System32 directory
- Drops file in Program Files directory
- Suspicious behavior: EnumeratesProcesses
- Suspicious use of AdjustPrivilegeToken
- Suspicious use of WriteProcessMemory
PID:2316
- C:\ProgramData\Templates\csrss.exe
  "C:\ProgramData\Templates\csrss.exe"
  2⤵
  - Executes dropped EXE
  - Suspicious behavior: EnumeratesProcesses
  - Suspicious use of AdjustPrivilegeToken
  PID:2712

C:\Windows\system32\schtasks.exe
schtasks.exe /create /tn "Idle" /sc ONLOGON /tr "'C:\Program Files (x86)\Reference Assemblies\Microsoft\Framework\v3.5\fr\Idle.exe'" /rl HIGHEST /f
1⤵
- Process spawned unexpected child process
- Scheduled Task/Job: Scheduled Task
PID:1932

C:\Windows\system32\schtasks.exe
schtasks.exe /create /tn "OSPPSVC" /sc ONLOGON /tr "'C:\Program Files\Common Files\Microsoft Shared\OfficeSoftwareProtectionPlatform\OSPPC\OSPPSVC.exe'" /rl HIGHEST /f
1⤵
- Process spawned unexpected child process
- Scheduled Task/Job: Scheduled Task
PID:1472

C:\Windows\system32\schtasks.exe
schtasks.exe /create /tn "csrss" /sc ONLOGON /tr "'C:\ProgramData\Templates\csrss.exe'" /rl HIGHEST /f
1⤵
- Process spawned unexpected child process
- Scheduled Task/Job: Scheduled Task
PID:2816

C:\Windows\system32\schtasks.exe
schtasks.exe /create /tn "csrss" /sc ONLOGON /tr "'C:\Windows\System32\gcdef\csrss.exe'" /rl HIGHEST /f
1⤵
- Process spawned unexpected child process
- Scheduled Task/Job: Scheduled Task
PID:2984

C:\Windows\system32\schtasks.exe
schtasks.exe /create /tn "dllhost" /sc ONLOGON /tr "'C:\Windows\System32\KBDBE\dllhost.exe'" /rl HIGHEST /f
1⤵
- Process spawned unexpected child process
- Scheduled Task/Job: Scheduled Task
PID:2736

C:\Windows\system32\schtasks.exe
schtasks.exe /create /tn "explorer" /sc ONLOGON /tr "'C:\Users\Admin\Local Settings\explorer.exe'" /rl HIGHEST /f
1⤵
- Process spawned unexpected child process
- Scheduled Task/Job: Scheduled Task
PID:2932

Network

MITRE ATT&CK Enterprise v15

Reconnaissance

Resource Development

Initial Access

Execution

Scheduled Task/Job

1

T1053

Scheduled Task

1

T1053.005

Persistence

Boot or Logon Autostart Execution

1

T1547

Registry Run Keys / Startup Folder

1

T1547.001

Scheduled Task/Job

1

T1053

Scheduled Task

1

T1053.005

Privilege Escalation

Boot or Logon Autostart Execution

1

T1547

Registry Run Keys / Startup Folder

1

T1547.001

Scheduled Task/Job

1

T1053

Scheduled Task

1

T1053.005

Defense Evasion

Modify Registry

1

T1112

Credential Access

Discovery

Query Registry

1

T1012

System Information Discovery

1

T1082

Lateral Movement

Collection

Command and Control

Exfiltration

Impact

Replay Monitor

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Downloads

C:\Windows\System32\KBDBE\dllhost.exe

Filesize
2.0MB

MD5
0707542d6d884c5c595b38ebedd025c9

SHA1
686f867f37c8aca23ea3cc298dec856667c1afcd

SHA256
8bc4ca0ef9348f4a331f850af113f2134c0aba41f6a1e9dd26f9b34db34b473b

SHA512
945eeeadb00c19934d034cfb9bd158246e2fcb989bb8808ce3fffee7707cc4ae1f83310db961ecfbd0bc99304b8c041ec7e4ee83893d1db7eac54910970cccc0

Download Submit
memory/2316-0-0x000007FEF5EE3000-0x000007FEF5EE4000-memory.dmp

Filesize
4KB

Download
memory/2316-1-0x0000000000F10000-0x0000000001122000-memory.dmp

Filesize
2.1MB

Download
memory/2316-2-0x000007FEF5EE0000-0x000007FEF68CC000-memory.dmp

Filesize
9.9MB

Download
memory/2316-22-0x000007FEF5EE0000-0x000007FEF68CC000-memory.dmp

Filesize
9.9MB

Download
memory/2712-23-0x00000000003C0000-0x00000000003CC000-memory.dmp

Filesize
48KB

Download
memory/2712-21-0x0000000001070000-0x0000000001282000-memory.dmp

Filesize
2.1MB

Download
memory/2712-24-0x00000000003D0000-0x00000000003DC000-memory.dmp

Filesize
48KB

Download
memory/2712-25-0x0000000000510000-0x0000000000518000-memory.dmp

Filesize
32KB

Download
memory/2712-26-0x0000000000D70000-0x0000000000DC6000-memory.dmp

Filesize
344KB

Download
memory/2712-27-0x00000000004F0000-0x00000000004FA000-memory.dmp

Filesize
40KB

Download
memory/2712-29-0x0000000000750000-0x0000000000758000-memory.dmp

Filesize
32KB

Download
memory/2712-28-0x0000000000500000-0x0000000000508000-memory.dmp

Filesize
32KB

Download

Analysis

Sharing

General

Malware Config

Signatures

Processes

Network

MITRE ATT&CK Enterprise v15

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Downloads