dcrat | f6a307d243c407c27489de37adac83e9205be531cbb4e2cb71545627faf813fd

Resubmissions

11-01-2021 13:09

210111-dlhjyngw66 8

11-01-2021 07:36

210111-xfhgmxjy6n 10

Analysis

max time kernel
143s
max time network
152s
platform
windows10_x64
resource
win10v20201028
submitted
11-01-2021 07:36

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General

Target

4ced2056e4efe1c93b9f4adaaeaba20c.exe
Size

607KB
MD5

4ced2056e4efe1c93b9f4adaaeaba20c
SHA1

b975777c42d7d8fb04c34a2efc64dc5e4c574712
SHA256

f6a307d243c407c27489de37adac83e9205be531cbb4e2cb71545627faf813fd
SHA512

014df0ad54bf23335f964fa4e313a91b60b3ea2c62b73a306e973177830b573666aaebc1932cafa766042f34b8e32adcfabe3027aae2cc09341fd138a8963eaf

Score

10^/10

dcrat evasion infostealer rat spyware stealer

Malware Config

Signatures

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

DC Rat Payload 4 IoCs

Detects payload of DCRat, commonly dropped by NSIS installers.

rat

Processes:

resource	yara_rule
C:\Users\Admin\AppData\Roaming\WinRAR\winrar-x84.exe	dcrat
C:\Users\Admin\AppData\Roaming\WinRAR\winrar-x84.exe	dcrat
C:\Windows\System\fontdrvhost.exe	dcrat
C:\Windows\System\fontdrvhost.exe	dcrat

Disables Task Manager via registry modification
evasion
Executes dropped EXE 3 IoCs

Processes:

HoykwG9pmLZ7sZbSP8eb.exewinrar-x84.exefontdrvhost.exe

pid process

808 HoykwG9pmLZ7sZbSP8eb.exe
4364 winrar-x84.exe
2476 fontdrvhost.exe
Reads user/profile data of web browsers 2 TTPs
Infostealers often target stored browser data, which can include saved credentials etc.
spyware stealer

Data from Local System
T1005

Credentials in Files
T1081
Looks up external IP address via web service 3 IoCs
Uses a legitimate IP lookup service to find the infected system's external IP.

Processes:

flow ioc

19 ipinfo.io
20 ipinfo.io
21 ipinfo.io

pid	process
808	HoykwG9pmLZ7sZbSP8eb.exe
4364	winrar-x84.exe
2476	fontdrvhost.exe

flow	ioc
19	ipinfo.io
20	ipinfo.io
21	ipinfo.io

Drops file in Windows directory 2 IoCs

Processes:

winrar-x84.exe

description	ioc	process
File created	C:\Windows\System\fontdrvhost.exe	winrar-x84.exe
File created	C:\Windows\System\5b884080fd4f94e2695da25c503f9e33b9605b83	winrar-x84.exe

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

System Information Discovery
T1082
Creates scheduled task(s) 1 TTPs 7 IoCs
Schtasks is often used by malware for persistence or to perform post-infection execution.
persistence

Scheduled Task
T1053

Processes:

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

pid process

996 schtasks.exe
1152 schtasks.exe
1404 schtasks.exe
1488 schtasks.exe
1688 schtasks.exe
1964 schtasks.exe
2224 schtasks.exe

pid	process
996	schtasks.exe
1152	schtasks.exe
1404	schtasks.exe
1488	schtasks.exe
1688	schtasks.exe
1964	schtasks.exe
2224	schtasks.exe

Modifies registry class 2 IoCs

Processes:

4ced2056e4efe1c93b9f4adaaeaba20c.exeHoykwG9pmLZ7sZbSP8eb.exe

description	ioc	process
Key created	\REGISTRY\USER\S-1-5-21-3341490333-719741536-2920803124-1000_Classes\Local Settings	4ced2056e4efe1c93b9f4adaaeaba20c.exe
Key created	\REGISTRY\USER\S-1-5-21-3341490333-719741536-2920803124-1000_Classes\Local Settings	HoykwG9pmLZ7sZbSP8eb.exe

Modifies registry key 1 TTPs 1 IoCs

Modify Registry
T1112

Processes:

reg.exe

pid process

4508 reg.exe
Suspicious behavior: EnumeratesProcesses 3 IoCs

Processes:

winrar-x84.exefontdrvhost.exe

pid process

4364 winrar-x84.exe
2476 fontdrvhost.exe
2476 fontdrvhost.exe
Suspicious use of AdjustPrivilegeToken 2 IoCs

Processes:

winrar-x84.exefontdrvhost.exe

description pid process

Token: SeDebugPrivilege 4364 winrar-x84.exe
Token: SeDebugPrivilege 2476 fontdrvhost.exe

pid	process
4508	reg.exe

pid	process
4364	winrar-x84.exe
2476	fontdrvhost.exe
2476	fontdrvhost.exe

description	pid	process
Token: SeDebugPrivilege	4364	winrar-x84.exe
Token: SeDebugPrivilege	2476	fontdrvhost.exe

Suspicious use of WriteProcessMemory 36 IoCs

Processes:

4ced2056e4efe1c93b9f4adaaeaba20c.exeWScript.execmd.exeHoykwG9pmLZ7sZbSP8eb.exeWScript.execmd.exewinrar-x84.exe

description	pid	process	target process
PID 4648 wrote to memory of 1640	4648	4ced2056e4efe1c93b9f4adaaeaba20c.exe	WScript.exe
PID 4648 wrote to memory of 1640	4648	4ced2056e4efe1c93b9f4adaaeaba20c.exe	WScript.exe
PID 4648 wrote to memory of 1640	4648	4ced2056e4efe1c93b9f4adaaeaba20c.exe	WScript.exe
PID 1640 wrote to memory of 4208	1640	WScript.exe	cmd.exe
PID 1640 wrote to memory of 4208	1640	WScript.exe	cmd.exe
PID 1640 wrote to memory of 4208	1640	WScript.exe	cmd.exe
PID 4208 wrote to memory of 808	4208	cmd.exe	HoykwG9pmLZ7sZbSP8eb.exe
PID 4208 wrote to memory of 808	4208	cmd.exe	HoykwG9pmLZ7sZbSP8eb.exe
PID 4208 wrote to memory of 808	4208	cmd.exe	HoykwG9pmLZ7sZbSP8eb.exe
PID 808 wrote to memory of 3088	808	HoykwG9pmLZ7sZbSP8eb.exe	WScript.exe
PID 808 wrote to memory of 3088	808	HoykwG9pmLZ7sZbSP8eb.exe	WScript.exe
PID 808 wrote to memory of 3088	808	HoykwG9pmLZ7sZbSP8eb.exe	WScript.exe
PID 3088 wrote to memory of 1868	3088	WScript.exe	cmd.exe
PID 3088 wrote to memory of 1868	3088	WScript.exe	cmd.exe
PID 3088 wrote to memory of 1868	3088	WScript.exe	cmd.exe
PID 1868 wrote to memory of 4364	1868	cmd.exe	winrar-x84.exe
PID 1868 wrote to memory of 4364	1868	cmd.exe	winrar-x84.exe
PID 4364 wrote to memory of 996	4364	winrar-x84.exe	schtasks.exe
PID 4364 wrote to memory of 996	4364	winrar-x84.exe	schtasks.exe
PID 4364 wrote to memory of 1152	4364	winrar-x84.exe	schtasks.exe
PID 4364 wrote to memory of 1152	4364	winrar-x84.exe	schtasks.exe
PID 4364 wrote to memory of 1404	4364	winrar-x84.exe	schtasks.exe
PID 4364 wrote to memory of 1404	4364	winrar-x84.exe	schtasks.exe
PID 4364 wrote to memory of 1488	4364	winrar-x84.exe	schtasks.exe
PID 4364 wrote to memory of 1488	4364	winrar-x84.exe	schtasks.exe
PID 4364 wrote to memory of 1688	4364	winrar-x84.exe	schtasks.exe
PID 4364 wrote to memory of 1688	4364	winrar-x84.exe	schtasks.exe
PID 4364 wrote to memory of 1964	4364	winrar-x84.exe	schtasks.exe
PID 4364 wrote to memory of 1964	4364	winrar-x84.exe	schtasks.exe
PID 4364 wrote to memory of 2224	4364	winrar-x84.exe	schtasks.exe
PID 4364 wrote to memory of 2224	4364	winrar-x84.exe	schtasks.exe
PID 4364 wrote to memory of 2476	4364	winrar-x84.exe	fontdrvhost.exe
PID 4364 wrote to memory of 2476	4364	winrar-x84.exe	fontdrvhost.exe
PID 1868 wrote to memory of 4508	1868	cmd.exe	reg.exe
PID 1868 wrote to memory of 4508	1868	cmd.exe	reg.exe
PID 1868 wrote to memory of 4508	1868	cmd.exe	reg.exe

C:\Users\Admin\AppData\Local\Temp\4ced2056e4efe1c93b9f4adaaeaba20c.exe
"C:\Users\Admin\AppData\Local\Temp\4ced2056e4efe1c93b9f4adaaeaba20c.exe"
1⤵
- Modifies registry class
- Suspicious use of WriteProcessMemory
PID:4648
- C:\Windows\SysWOW64\WScript.exe
  "C:\Windows\System32\WScript.exe" "C:\Users\Admin\AppData\Roaming\WinRAR\wSmIzsMZSTGIPjXygtTeiEZYkIjJjD.vbe"
  2⤵
  - Suspicious use of WriteProcessMemory
  PID:1640
- - C:\Windows\SysWOW64\cmd.exe
    C:\Windows\system32\cmd.exe /c ""C:\Users\Admin\AppData\Roaming\WinRAR\wAcLjfo4uMcnTa1rAjnz0eLcoo04D9.bat" "
    3⤵
    - Suspicious use of WriteProcessMemory
    PID:4208
  - - C:\Users\Admin\AppData\Roaming\WinRAR\HoykwG9pmLZ7sZbSP8eb.exe
      HoykwG9pmLZ7sZbSP8eb.exe -p2e840a597483ac4423c7c5ec1a09b39042cbf75d
      4⤵
      Executes dropped EXE
      Modifies registry class
      Suspicious use of WriteProcessMemory
      PID:808
    - - C:\Windows\SysWOW64\WScript.exe
        
        "C:\Windows\System32\WScript.exe" "C:\Users\Admin\AppData\Roaming\WinRAR\tPKG2uMJtmCS4Bv6TMepBvdoqxAPGa.vbe"
        5⤵
        Suspicious use of WriteProcessMemory
        
        PID:3088
      - C:\Windows\SysWOW64\cmd.exe
        
        C:\Windows\system32\cmd.exe /c ""C:\Users\Admin\AppData\Roaming\WinRAR\mQE440b4P9lIBPO3Qboqf8inqaQoJr.bat" "
        6⤵
        Suspicious use of WriteProcessMemory
        
        PID:1868
        
        C:\Users\Admin\AppData\Roaming\WinRAR\winrar-x84.exe
        
        "C:\Users\Admin\AppData\Roaming\WinRAR\winrar-x84.exe"
        7⤵
        Executes dropped EXE
        Drops file in Windows directory
        Suspicious behavior: EnumeratesProcesses
        Suspicious use of AdjustPrivilegeToken
        Suspicious use of WriteProcessMemory
        
        PID:4364
        
        C:\Windows\SYSTEM32\schtasks.exe
        
        "schtasks" /create /tn "Idle" /sc ONLOGON /tr "'C:\ProgramData\Microsoft\Speech_OneCore\Idle.exe'" /rl HIGHEST /f
        8⤵
        Creates scheduled task(s)
        
        PID:996
        
        C:\Windows\SYSTEM32\schtasks.exe
        
        "schtasks" /create /tn "explorer" /sc ONLOGON /tr "'C:\odt\explorer.exe'" /rl HIGHEST /f
        8⤵
        Creates scheduled task(s)
        
        PID:1152
        
        C:\Windows\SYSTEM32\schtasks.exe
        
        "schtasks" /create /tn "dllhost" /sc ONLOGON /tr "'C:\odt\dllhost.exe'" /rl HIGHEST /f
        8⤵
        Creates scheduled task(s)
        
        PID:1404
        
        C:\Windows\SYSTEM32\schtasks.exe
        
        "schtasks" /create /tn "dwm" /sc ONLOGON /tr "'C:\Users\Admin\Desktop\dwm.exe'" /rl HIGHEST /f
        8⤵
        Creates scheduled task(s)
        
        PID:1488
        
        C:\Windows\SYSTEM32\schtasks.exe
        
        "schtasks" /create /tn "dllhost" /sc ONLOGON /tr "'C:\Recovery\WindowsRE\dllhost.exe'" /rl HIGHEST /f
        8⤵
        Creates scheduled task(s)
        
        PID:1688
        
        C:\Windows\SYSTEM32\schtasks.exe
        
        "schtasks" /create /tn "sppsvc" /sc ONLOGON /tr "'C:\Users\Default\Desktop\sppsvc.exe'" /rl HIGHEST /f
        8⤵
        Creates scheduled task(s)
        
        PID:1964
        
        C:\Windows\SYSTEM32\schtasks.exe
        
        "schtasks" /create /tn "fontdrvhost" /sc ONLOGON /tr "'C:\Windows\System\fontdrvhost.exe'" /rl HIGHEST /f
        8⤵
        Creates scheduled task(s)
        
        PID:2224
        
        C:\Windows\System\fontdrvhost.exe
        
        "C:\Windows\System\fontdrvhost.exe"
        8⤵
        Executes dropped EXE
        Suspicious behavior: EnumeratesProcesses
        Suspicious use of AdjustPrivilegeToken
        
        PID:2476
        
        C:\Windows\SysWOW64\reg.exe
        
        reg add HKCU\Software\Microsoft\Windows\CurrentVersion\Policies\System /v DisableTaskMgr /t REG_DWORD /d 1 /f
        7⤵
        Modifies registry key
        
        PID:4508

Network

MITRE ATT&CK Enterprise v6

Initial Access

Execution

Scheduled Task

T1053

Persistence

Scheduled Task

T1053

Privilege Escalation

Scheduled Task

T1053

Defense Evasion

Modify Registry

T1112

Credential Access

Credentials in Files

T1081

Discovery

System Information Discovery

T1082

Lateral Movement

Collection

Data from Local System

T1005

Command and Control

Exfiltration

Impact

Replay Monitor

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Downloads

C:\Users\Admin\AppData\Roaming\WinRAR\HoykwG9pmLZ7sZbSP8eb.exe

MD5
92066cc64fbbdc6d4a1b0293f80b2bdd

SHA1
ffa822f85e5d87ea90b8572bbb1bac8c1859b7e0

SHA256
c5d5173a31a341be6e07f90434b2ca20c6d148668ac5c26ea2ecfa200e59e40d

SHA512
0e9fda642e6a56567f1304e93e27b6b82da035aa6e992aaf4691e2879af043178765407452adf775309d08749014e2a6ed3f49a588ed3e855fd261d0749c0104

Download Submit
C:\Users\Admin\AppData\Roaming\WinRAR\HoykwG9pmLZ7sZbSP8eb.exe

MD5
92066cc64fbbdc6d4a1b0293f80b2bdd

SHA1
ffa822f85e5d87ea90b8572bbb1bac8c1859b7e0

SHA256
c5d5173a31a341be6e07f90434b2ca20c6d148668ac5c26ea2ecfa200e59e40d

SHA512
0e9fda642e6a56567f1304e93e27b6b82da035aa6e992aaf4691e2879af043178765407452adf775309d08749014e2a6ed3f49a588ed3e855fd261d0749c0104

Download Submit
C:\Users\Admin\AppData\Roaming\WinRAR\mQE440b4P9lIBPO3Qboqf8inqaQoJr.bat

MD5
ed2715cde51a566a09ffc2b014c19151

SHA1
f4c12f15a573acebc744a615a8fed1fcb6ce63fb

SHA256
314aaf622368833d4d7c1dc9810a68990783fe71f77ff398183b750c97a9d1b2

SHA512
015832bd16f920e2f58388d8017a13bcc70d1a128dd03b77e50ab76c6450e9d211a6c54c39913e55ab206b791bebf06bb0207d8e7cb508bef495073508b91de5

Download Submit
C:\Users\Admin\AppData\Roaming\WinRAR\tPKG2uMJtmCS4Bv6TMepBvdoqxAPGa.vbe

MD5
753c5cefa9d71892e70c2698575acb20

SHA1
38c83d89b6c2f166009bbbfb90e483c0053b6450

SHA256
5b81eb6d542e036272f8c3e02d72a0080be8d31b6c821534568fe6b7f7581d28

SHA512
bc964ed6522b2647575a149329a4ee02cfd54ab964f43747b8fe7d4d615701fc394b99feac16b6d4da6c7dfd6405726386841912d2c38767b9db375c13a86ee9

Download Submit
C:\Users\Admin\AppData\Roaming\WinRAR\wAcLjfo4uMcnTa1rAjnz0eLcoo04D9.bat

MD5
ce75cfe3a73c8e92c7dbfbc4c945990f

SHA1
da5cbaa82e1c622b29c5971dd299345c1a1274fa

SHA256
be4233a3fb0da15811de2c98fa0c58e60e2af7b98cb449107a198b4167665aef

SHA512
c678ac1d8dccc210e40d02dab9dd7c217e7a36a0e46dd82197dcada4b4b2e3511b6a7ea274936dea1a66de7778608ac2bcaf0dabb3e876a32ea3b21247018d01

Download Submit
C:\Users\Admin\AppData\Roaming\WinRAR\wSmIzsMZSTGIPjXygtTeiEZYkIjJjD.vbe

MD5
22382236eed1791830d2cb491490686b

SHA1
5927c6f2246eb952efa44d42b7e3e68acdb5d097

SHA256
ba2d08aeb026be4ea0b2ce2e69d77493daf7c111bb1e3ee44e18028df898092f

SHA512
c0bbb9d2f64b0d084b61f94075dc45a612a871676b291d960d2639fec6aa7f4e078411fb50738aa4d515bdb6bab709e323e268ac26d8905a5ae6a6ffe582e94d

Download Submit
C:\Users\Admin\AppData\Roaming\WinRAR\winrar-x84.exe

MD5
bb15e4323d2b8ce4bb903b05c7b45562

SHA1
c596278a1c30c1c68577c421fbdd21a672cb3622

SHA256
808ccc6e8d8a46dc73a6c18326fd3f484eb8bf52c78602092d1be0c851bc0372

SHA512
f630375b4cc2f4b25c977334d6f90462f6c6f897df2d8bd887f0d9f5e622877fb7f280fda7c5add4d95cd1bef600b060c4bc38780c7c201188f8c0f5a20f5a1f

Download Submit
C:\Users\Admin\AppData\Roaming\WinRAR\winrar-x84.exe

MD5
bb15e4323d2b8ce4bb903b05c7b45562

SHA1
c596278a1c30c1c68577c421fbdd21a672cb3622

SHA256
808ccc6e8d8a46dc73a6c18326fd3f484eb8bf52c78602092d1be0c851bc0372

SHA512
f630375b4cc2f4b25c977334d6f90462f6c6f897df2d8bd887f0d9f5e622877fb7f280fda7c5add4d95cd1bef600b060c4bc38780c7c201188f8c0f5a20f5a1f

Download Submit
C:\Windows\System\fontdrvhost.exe

MD5
bb15e4323d2b8ce4bb903b05c7b45562

SHA1
c596278a1c30c1c68577c421fbdd21a672cb3622

SHA256
808ccc6e8d8a46dc73a6c18326fd3f484eb8bf52c78602092d1be0c851bc0372

SHA512
f630375b4cc2f4b25c977334d6f90462f6c6f897df2d8bd887f0d9f5e622877fb7f280fda7c5add4d95cd1bef600b060c4bc38780c7c201188f8c0f5a20f5a1f

Download Submit
C:\Windows\System\fontdrvhost.exe

MD5
bb15e4323d2b8ce4bb903b05c7b45562

SHA1
c596278a1c30c1c68577c421fbdd21a672cb3622

SHA256
808ccc6e8d8a46dc73a6c18326fd3f484eb8bf52c78602092d1be0c851bc0372

SHA512
f630375b4cc2f4b25c977334d6f90462f6c6f897df2d8bd887f0d9f5e622877fb7f280fda7c5add4d95cd1bef600b060c4bc38780c7c201188f8c0f5a20f5a1f

Download Submit
memory/808-7-0x0000000000000000-mapping.dmp

Download
memory/996-20-0x0000000000000000-mapping.dmp

Download
memory/1152-21-0x0000000000000000-mapping.dmp

Download
memory/1404-22-0x0000000000000000-mapping.dmp

Download
memory/1488-23-0x0000000000000000-mapping.dmp

Download
memory/1640-3-0x0000000000000000-mapping.dmp

Download
memory/1688-24-0x0000000000000000-mapping.dmp

Download
memory/1868-13-0x0000000000000000-mapping.dmp

Download
memory/1964-25-0x0000000000000000-mapping.dmp

Download
memory/2224-26-0x0000000000000000-mapping.dmp

Download
memory/2476-34-0x000001EE36DE0000-0x000001EE36DE1000-memory.dmp

Filesize
4KB

Download
memory/2476-27-0x0000000000000000-mapping.dmp

Download
memory/2476-30-0x00007FFBE0110000-0x00007FFBE0AFC000-memory.dmp

Filesize
9.9MB

Download
memory/3088-10-0x0000000000000000-mapping.dmp

Download
memory/4208-6-0x0000000000000000-mapping.dmp

Download
memory/4364-18-0x00000266F7760000-0x00000266F7761000-memory.dmp

Filesize
4KB

Download
memory/4364-17-0x00007FFBE0110000-0x00007FFBE0AFC000-memory.dmp

Filesize
9.9MB

Download
memory/4364-14-0x0000000000000000-mapping.dmp

Download
memory/4508-33-0x0000000000000000-mapping.dmp

Download