dcrat | ee66bca1ea767e827dfafd301d994e9afd36ff0fae546ad51e18347e999e9529

General

Target

ee66bca1ea767e827dfafd301d994e9afd36ff0fae546ad51e18347e999e9529N.exe
Size

1.2MB
MD5

bb7e3c97bc9136dd95203ac7b480b230
SHA1

55af32d959f455d87aec058789c35471272a34f2
SHA256

ee66bca1ea767e827dfafd301d994e9afd36ff0fae546ad51e18347e999e9529
SHA512

7cfe9fc9e23247ffd1f6d0fb7588af62c01f714d843e2268dab1442af2471e22559d1e41878bdcfb6796d6e572eda982c887160d20015a96e7c3a9c87ad1d77b
SSDEEP

24576:m5/FWj01uCUyGXFgSTq/kbe58fWj+1Ya:k/FG0Cpt4i28fWj+1Y

Score

10^/10

dcrat infostealer persistence rat

Malware Config

Signatures

DcRat 6 IoCs

DarkCrystal(DC) is a new .NET RAT active since June 2019 capable of loading additional plugins.

rat infostealer dcrat

description	ioc	pid	Process
File created	C:\Windows\System32\RstrtMgr\dwm.exe		ee66bca1ea767e827dfafd301d994e9afd36ff0fae546ad51e18347e999e9529N.exe
File created	C:\Windows\System32\RstrtMgr\6cb0b6c459d5d3		ee66bca1ea767e827dfafd301d994e9afd36ff0fae546ad51e18347e999e9529N.exe
		2276	schtasks.exe
		2832	schtasks.exe
		2324	schtasks.exe
		332	schtasks.exe

Dcrat family
dcrat

Modifies WinLogon for persistence 2 TTPs 4 IoCs

persistence

Winlogon Helper DLL

T1547.004

Modify Registry

T1112

description	ioc	Process
Set value (str)	\REGISTRY\MACHINE\SOFTWARE\Microsoft\Windows NT\CurrentVersion\Winlogon\Shell = "explorer.exe, \"C:\\Windows\\System32\\RstrtMgr\\dwm.exe\", \"C:\\Program Files (x86)\\Windows NT\\TableTextService\\it-IT\\csrss.exe\""	ee66bca1ea767e827dfafd301d994e9afd36ff0fae546ad51e18347e999e9529N.exe
Set value (str)	\REGISTRY\MACHINE\SOFTWARE\Microsoft\Windows NT\CurrentVersion\Winlogon\Shell = "explorer.exe, \"C:\\Windows\\System32\\RstrtMgr\\dwm.exe\", \"C:\\Program Files (x86)\\Windows NT\\TableTextService\\it-IT\\csrss.exe\", \"C:\\Windows\\System32\\pegibbfc\\lsass.exe\""	ee66bca1ea767e827dfafd301d994e9afd36ff0fae546ad51e18347e999e9529N.exe
Set value (str)	\REGISTRY\MACHINE\SOFTWARE\Microsoft\Windows NT\CurrentVersion\Winlogon\Shell = "explorer.exe, \"C:\\Windows\\System32\\RstrtMgr\\dwm.exe\", \"C:\\Program Files (x86)\\Windows NT\\TableTextService\\it-IT\\csrss.exe\", \"C:\\Windows\\System32\\pegibbfc\\lsass.exe\", \"C:\\Program Files\\Common Files\\Microsoft Shared\\OfficeSoftwareProtectionPlatform\\OSPPWMI\\OSPPSVC.exe\""	ee66bca1ea767e827dfafd301d994e9afd36ff0fae546ad51e18347e999e9529N.exe
Set value (str)	\REGISTRY\MACHINE\SOFTWARE\Microsoft\Windows NT\CurrentVersion\Winlogon\Shell = "explorer.exe, \"C:\\Windows\\System32\\RstrtMgr\\dwm.exe\""	ee66bca1ea767e827dfafd301d994e9afd36ff0fae546ad51e18347e999e9529N.exe

Process spawned unexpected child process 4 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	2276	484	schtasks.exe	30
Parent C:\Windows\system32\wbem\wmiprvse.exe is not expected to spawn this process	2832	484	schtasks.exe	30
Parent C:\Windows\system32\wbem\wmiprvse.exe is not expected to spawn this process	2324	484	schtasks.exe	30
Parent C:\Windows\system32\wbem\wmiprvse.exe is not expected to spawn this process	332	484	schtasks.exe	30

DCRat payload 4 IoCs

Detects payload of DCRat, commonly dropped by NSIS installers.

rat

resource	yara_rule
behavioral1/memory/1220-1-0x0000000000CE0000-0x0000000000E24000-memory.dmp	dcrat
behavioral1/files/0x0006000000019481-21.dat	dcrat
behavioral1/files/0x0008000000016ca5-73.dat	dcrat
behavioral1/memory/1604-75-0x0000000000270000-0x00000000003B4000-memory.dmp	dcrat

Executes dropped EXE 1 IoCs

pid	Process
1604	lsass.exe

Adds Run key to start application 2 TTPs 8 IoCs

persistence

Registry Run Keys / Startup Folder

T1547.001

Modify Registry

T1112

description	ioc	Process
Set value (str)	\REGISTRY\USER\S-1-5-21-2039016743-699959520-214465309-1000\Software\Microsoft\Windows\CurrentVersion\Run\csrss = "\"C:\\Program Files (x86)\\Windows NT\\TableTextService\\it-IT\\csrss.exe\""	ee66bca1ea767e827dfafd301d994e9afd36ff0fae546ad51e18347e999e9529N.exe
Set value (str)	\REGISTRY\MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Run\csrss = "\"C:\\Program Files (x86)\\Windows NT\\TableTextService\\it-IT\\csrss.exe\""	ee66bca1ea767e827dfafd301d994e9afd36ff0fae546ad51e18347e999e9529N.exe
Set value (str)	\REGISTRY\USER\S-1-5-21-2039016743-699959520-214465309-1000\Software\Microsoft\Windows\CurrentVersion\Run\lsass = "\"C:\\Windows\\System32\\pegibbfc\\lsass.exe\""	ee66bca1ea767e827dfafd301d994e9afd36ff0fae546ad51e18347e999e9529N.exe
Set value (str)	\REGISTRY\MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Run\lsass = "\"C:\\Windows\\System32\\pegibbfc\\lsass.exe\""	ee66bca1ea767e827dfafd301d994e9afd36ff0fae546ad51e18347e999e9529N.exe
Set value (str)	\REGISTRY\USER\S-1-5-21-2039016743-699959520-214465309-1000\Software\Microsoft\Windows\CurrentVersion\Run\OSPPSVC = "\"C:\\Program Files\\Common Files\\Microsoft Shared\\OfficeSoftwareProtectionPlatform\\OSPPWMI\\OSPPSVC.exe\""	ee66bca1ea767e827dfafd301d994e9afd36ff0fae546ad51e18347e999e9529N.exe
Set value (str)	\REGISTRY\MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Run\OSPPSVC = "\"C:\\Program Files\\Common Files\\Microsoft Shared\\OfficeSoftwareProtectionPlatform\\OSPPWMI\\OSPPSVC.exe\""	ee66bca1ea767e827dfafd301d994e9afd36ff0fae546ad51e18347e999e9529N.exe
Set value (str)	\REGISTRY\USER\S-1-5-21-2039016743-699959520-214465309-1000\Software\Microsoft\Windows\CurrentVersion\Run\dwm = "\"C:\\Windows\\System32\\RstrtMgr\\dwm.exe\""	ee66bca1ea767e827dfafd301d994e9afd36ff0fae546ad51e18347e999e9529N.exe
Set value (str)	\REGISTRY\MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Run\dwm = "\"C:\\Windows\\System32\\RstrtMgr\\dwm.exe\""	ee66bca1ea767e827dfafd301d994e9afd36ff0fae546ad51e18347e999e9529N.exe

Drops file in System32 directory 10 IoCs

description	ioc	Process
File opened for modification	C:\Windows\System32\RstrtMgr\RCXB770.tmp	ee66bca1ea767e827dfafd301d994e9afd36ff0fae546ad51e18347e999e9529N.exe
File opened for modification	C:\Windows\System32\pegibbfc\RCXBBE6.tmp	ee66bca1ea767e827dfafd301d994e9afd36ff0fae546ad51e18347e999e9529N.exe
File created	C:\Windows\System32\pegibbfc\6203df4a6bafc7	ee66bca1ea767e827dfafd301d994e9afd36ff0fae546ad51e18347e999e9529N.exe
File opened for modification	C:\Windows\System32\RstrtMgr\RCXB76F.tmp	ee66bca1ea767e827dfafd301d994e9afd36ff0fae546ad51e18347e999e9529N.exe
File created	C:\Windows\System32\RstrtMgr\6cb0b6c459d5d3	ee66bca1ea767e827dfafd301d994e9afd36ff0fae546ad51e18347e999e9529N.exe
File created	C:\Windows\System32\pegibbfc\lsass.exe	ee66bca1ea767e827dfafd301d994e9afd36ff0fae546ad51e18347e999e9529N.exe
File opened for modification	C:\Windows\System32\pegibbfc\RCXBC54.tmp	ee66bca1ea767e827dfafd301d994e9afd36ff0fae546ad51e18347e999e9529N.exe
File opened for modification	C:\Windows\System32\pegibbfc\lsass.exe	ee66bca1ea767e827dfafd301d994e9afd36ff0fae546ad51e18347e999e9529N.exe
File created	C:\Windows\System32\RstrtMgr\dwm.exe	ee66bca1ea767e827dfafd301d994e9afd36ff0fae546ad51e18347e999e9529N.exe
File opened for modification	C:\Windows\System32\RstrtMgr\dwm.exe	ee66bca1ea767e827dfafd301d994e9afd36ff0fae546ad51e18347e999e9529N.exe

Drops file in Program Files directory 10 IoCs

description	ioc	Process
File opened for modification	C:\Program Files\Common Files\Microsoft Shared\OfficeSoftwareProtectionPlatform\OSPPWMI\OSPPSVC.exe	ee66bca1ea767e827dfafd301d994e9afd36ff0fae546ad51e18347e999e9529N.exe
File created	C:\Program Files (x86)\Windows NT\TableTextService\it-IT\886983d96e3d3e	ee66bca1ea767e827dfafd301d994e9afd36ff0fae546ad51e18347e999e9529N.exe
File opened for modification	C:\Program Files (x86)\Windows NT\TableTextService\it-IT\RCXB9E1.tmp	ee66bca1ea767e827dfafd301d994e9afd36ff0fae546ad51e18347e999e9529N.exe
File opened for modification	C:\Program Files (x86)\Windows NT\TableTextService\it-IT\csrss.exe	ee66bca1ea767e827dfafd301d994e9afd36ff0fae546ad51e18347e999e9529N.exe
File opened for modification	C:\Program Files\Common Files\Microsoft Shared\OfficeSoftwareProtectionPlatform\OSPPWMI\RCXBEC6.tmp	ee66bca1ea767e827dfafd301d994e9afd36ff0fae546ad51e18347e999e9529N.exe
File opened for modification	C:\Program Files\Common Files\Microsoft Shared\OfficeSoftwareProtectionPlatform\OSPPWMI\RCXBEC5.tmp	ee66bca1ea767e827dfafd301d994e9afd36ff0fae546ad51e18347e999e9529N.exe
File created	C:\Program Files (x86)\Windows NT\TableTextService\it-IT\csrss.exe	ee66bca1ea767e827dfafd301d994e9afd36ff0fae546ad51e18347e999e9529N.exe
File created	C:\Program Files\Common Files\Microsoft Shared\OfficeSoftwareProtectionPlatform\OSPPWMI\OSPPSVC.exe	ee66bca1ea767e827dfafd301d994e9afd36ff0fae546ad51e18347e999e9529N.exe
File created	C:\Program Files\Common Files\Microsoft Shared\OfficeSoftwareProtectionPlatform\OSPPWMI\1610b97d3ab4a7	ee66bca1ea767e827dfafd301d994e9afd36ff0fae546ad51e18347e999e9529N.exe
File opened for modification	C:\Program Files (x86)\Windows NT\TableTextService\it-IT\RCXB9E2.tmp	ee66bca1ea767e827dfafd301d994e9afd36ff0fae546ad51e18347e999e9529N.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 4 IoCs

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

persistence execution

Scheduled Task

T1053.005

pid	Process
2276	schtasks.exe
2832	schtasks.exe
2324	schtasks.exe
332	schtasks.exe

Suspicious behavior: EnumeratesProcesses 1 IoCs

pid	Process
1220	ee66bca1ea767e827dfafd301d994e9afd36ff0fae546ad51e18347e999e9529N.exe

Suspicious use of AdjustPrivilegeToken 2 IoCs

description	pid	Process
Token: SeDebugPrivilege	1220	ee66bca1ea767e827dfafd301d994e9afd36ff0fae546ad51e18347e999e9529N.exe
Token: SeDebugPrivilege	1604	lsass.exe

Suspicious use of WriteProcessMemory 3 IoCs

description	pid	Process	procid_target
PID 1220 wrote to memory of 1604	1220	ee66bca1ea767e827dfafd301d994e9afd36ff0fae546ad51e18347e999e9529N.exe	35
PID 1220 wrote to memory of 1604	1220	ee66bca1ea767e827dfafd301d994e9afd36ff0fae546ad51e18347e999e9529N.exe	35
PID 1220 wrote to memory of 1604	1220	ee66bca1ea767e827dfafd301d994e9afd36ff0fae546ad51e18347e999e9529N.exe	35

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\ee66bca1ea767e827dfafd301d994e9afd36ff0fae546ad51e18347e999e9529N.exe
"C:\Users\Admin\AppData\Local\Temp\ee66bca1ea767e827dfafd301d994e9afd36ff0fae546ad51e18347e999e9529N.exe"
1⤵
- DcRat
- Modifies WinLogon for persistence
- 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:1220
- C:\Windows\System32\pegibbfc\lsass.exe
  "C:\Windows\System32\pegibbfc\lsass.exe"
  2⤵
  - Executes dropped EXE
  - Suspicious use of AdjustPrivilegeToken
  PID:1604

C:\Windows\system32\schtasks.exe
schtasks.exe /create /tn "dwm" /sc ONLOGON /tr "'C:\Windows\System32\RstrtMgr\dwm.exe'" /rl HIGHEST /f
1⤵
- DcRat
- Process spawned unexpected child process
- Scheduled Task/Job: Scheduled Task
PID:2276

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

C:\Windows\system32\schtasks.exe
schtasks.exe /create /tn "lsass" /sc ONLOGON /tr "'C:\Windows\System32\pegibbfc\lsass.exe'" /rl HIGHEST /f
1⤵
- DcRat
- Process spawned unexpected child process
- Scheduled Task/Job: Scheduled Task
PID:2324

C:\Windows\system32\schtasks.exe
schtasks.exe /create /tn "OSPPSVC" /sc ONLOGON /tr "'C:\Program Files\Common Files\Microsoft Shared\OfficeSoftwareProtectionPlatform\OSPPWMI\OSPPSVC.exe'" /rl HIGHEST /f
1⤵
- DcRat
- Process spawned unexpected child process
- Scheduled Task/Job: Scheduled Task
PID:332

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

2

T1547

Registry Run Keys / Startup Folder

1

T1547.001

Winlogon Helper DLL

1

T1547.004

Scheduled Task/Job

1

T1053

Scheduled Task

1

T1053.005

Privilege Escalation

Boot or Logon Autostart Execution

2

T1547

Registry Run Keys / Startup Folder

1

T1547.001

Winlogon Helper DLL

1

T1547.004

Scheduled Task/Job

1

T1053

Scheduled Task

1

T1053.005

Defense Evasion

Modify Registry

2

T1112

Credential Access

Discovery

Query Registry

1

T1012

System Information Discovery

1

T1082

Lateral Movement

Collection

Command and Control

Exfiltration

Impact

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Downloads

C:\Users\Admin\AppData\Local\Temp\RCXB55C.tmp

Filesize
1.2MB

MD5
bb7e3c97bc9136dd95203ac7b480b230

SHA1
55af32d959f455d87aec058789c35471272a34f2

SHA256
ee66bca1ea767e827dfafd301d994e9afd36ff0fae546ad51e18347e999e9529

SHA512
7cfe9fc9e23247ffd1f6d0fb7588af62c01f714d843e2268dab1442af2471e22559d1e41878bdcfb6796d6e572eda982c887160d20015a96e7c3a9c87ad1d77b

Download Submit
C:\Windows\System32\pegibbfc\lsass.exe

Filesize
1.2MB

MD5
1d36c36f25a8325f6bed0f61e8ca99ae

SHA1
49cae12708ffad24b5a2ba65af993cc68b1179ae

SHA256
189c03112c37251064cb3f71e10cb9643eed80ca74b3759359129514740113aa

SHA512
e8f96921381c9374aa8c79d44260e60d07b8645f7ea88dc5531a0c3c0b0fefa6fdb1d7915c2509c1b552cc0516d7e19b569b7982ba48c3a45ef8b65210ffeef4

Download Submit
memory/1220-6-0x0000000000190000-0x000000000019A000-memory.dmp

Filesize
40KB

Download
memory/1220-3-0x0000000000150000-0x0000000000160000-memory.dmp

Filesize
64KB

Download
memory/1220-4-0x0000000000170000-0x000000000017C000-memory.dmp

Filesize
48KB

Download
memory/1220-5-0x0000000000180000-0x0000000000190000-memory.dmp

Filesize
64KB

Download
memory/1220-0-0x000007FEF5AB3000-0x000007FEF5AB4000-memory.dmp

Filesize
4KB

Download
memory/1220-7-0x00000000001A0000-0x00000000001AA000-memory.dmp

Filesize
40KB

Download
memory/1220-8-0x00000000001B0000-0x00000000001BC000-memory.dmp

Filesize
48KB

Download
memory/1220-9-0x00000000003C0000-0x00000000003CC000-memory.dmp

Filesize
48KB

Download
memory/1220-2-0x000007FEF5AB0000-0x000007FEF649C000-memory.dmp

Filesize
9.9MB

Download
memory/1220-1-0x0000000000CE0000-0x0000000000E24000-memory.dmp

Filesize
1.3MB

Download
memory/1220-76-0x000007FEF5AB0000-0x000007FEF649C000-memory.dmp

Filesize
9.9MB

Download
memory/1604-75-0x0000000000270000-0x00000000003B4000-memory.dmp

Filesize
1.3MB

Download

Analysis

Sharing

General

Malware Config

Signatures

Processes

Network

MITRE ATT&CK Enterprise v15

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Downloads