dcrat | 705e9214debeb58fba4ec0bf3cea5a08df142f5bbde6d4b82b6646cf3f2a6622

General

Target

705e9214debeb58fba4ec0bf3cea5a08df142f5bbde6d4b82b6646cf3f2a6622.exe
Size

547KB
MD5

637920e868b2367c5e6517ee4744d3c9
SHA1

09f66f5db717cf9df695bb89d8e2643229379969
SHA256

705e9214debeb58fba4ec0bf3cea5a08df142f5bbde6d4b82b6646cf3f2a6622
SHA512

92846cd4ee57c2be2c5146692defab8f5b4cb58eed5f44ba13b3aa36f537f8454090929618f4ec9104ee90cba8af9aa2340f89dac3ec3d488f30682af2760443
SSDEEP

12288:xqnO30tV2lZu09sR2ia1OgdDG3cSIksYEkQlrBt:x+O3rvZDiUx5r

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 8 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	2960	2956	schtasks.exe	30
Parent C:\Windows\system32\wbem\wmiprvse.exe is not expected to spawn this process	2940	2956	schtasks.exe	30
Parent C:\Windows\system32\wbem\wmiprvse.exe is not expected to spawn this process	2900	2956	schtasks.exe	30
Parent C:\Windows\system32\wbem\wmiprvse.exe is not expected to spawn this process	864	2956	schtasks.exe	30
Parent C:\Windows\system32\wbem\wmiprvse.exe is not expected to spawn this process	2788	2956	schtasks.exe	30
Parent C:\Windows\system32\wbem\wmiprvse.exe is not expected to spawn this process	2804	2956	schtasks.exe	30
Parent C:\Windows\system32\wbem\wmiprvse.exe is not expected to spawn this process	2784	2956	schtasks.exe	30
Parent C:\Windows\system32\wbem\wmiprvse.exe is not expected to spawn this process	976	2956	schtasks.exe	30

DCRat payload 3 IoCs

Detects payload of DCRat, commonly dropped by NSIS installers.

rat

resource	yara_rule
behavioral1/memory/2820-1-0x0000000000C20000-0x0000000000CB0000-memory.dmp	dcrat
behavioral1/files/0x00050000000195bd-11.dat	dcrat
behavioral1/memory/1940-27-0x0000000000360000-0x00000000003F0000-memory.dmp	dcrat

Executes dropped EXE 1 IoCs

pid	Process
1940	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\MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Run\taskhost = "\"C:\\Windows\\System32\\mfc120chs\\taskhost.exe\""	705e9214debeb58fba4ec0bf3cea5a08df142f5bbde6d4b82b6646cf3f2a6622.exe
Set value (str)	\REGISTRY\MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Run\wininit = "\"C:\\Windows\\DigitalLocker\\ja-JP\\wininit.exe\""	705e9214debeb58fba4ec0bf3cea5a08df142f5bbde6d4b82b6646cf3f2a6622.exe
Set value (str)	\REGISTRY\MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Run\lsm = "\"C:\\Users\\Admin\\AppData\\LocalLow\\Mozilla\\lsm.exe\""	705e9214debeb58fba4ec0bf3cea5a08df142f5bbde6d4b82b6646cf3f2a6622.exe
Set value (str)	\REGISTRY\MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Run\explorer = "\"C:\\Windows\\twain_32\\explorer.exe\""	705e9214debeb58fba4ec0bf3cea5a08df142f5bbde6d4b82b6646cf3f2a6622.exe
Set value (str)	\REGISTRY\MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Run\lsass = "\"C:\\Windows\\System32\\authfwcfg\\lsass.exe\""	705e9214debeb58fba4ec0bf3cea5a08df142f5bbde6d4b82b6646cf3f2a6622.exe
Set value (str)	\REGISTRY\MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Run\WmiPrvSE = "\"C:\\Windows\\System32\\wbem\\mstsc\\WmiPrvSE.exe\""	705e9214debeb58fba4ec0bf3cea5a08df142f5bbde6d4b82b6646cf3f2a6622.exe
Set value (str)	\REGISTRY\MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Run\705e9214debeb58fba4ec0bf3cea5a08df142f5bbde6d4b82b6646cf3f2a6622 = "\"C:\\Users\\Admin\\AppData\\Local\\Temp\\dd_vcredistUI0838\\705e9214debeb58fba4ec0bf3cea5a08df142f5bbde6d4b82b6646cf3f2a6622.exe\""	705e9214debeb58fba4ec0bf3cea5a08df142f5bbde6d4b82b6646cf3f2a6622.exe
Set value (str)	\REGISTRY\MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Run\Idle = "\"C:\\Documents and Settings\\Idle.exe\""	705e9214debeb58fba4ec0bf3cea5a08df142f5bbde6d4b82b6646cf3f2a6622.exe

Drops file in System32 directory 6 IoCs

description	ioc	Process
File created	C:\Windows\System32\mfc120chs\taskhost.exe	705e9214debeb58fba4ec0bf3cea5a08df142f5bbde6d4b82b6646cf3f2a6622.exe
File created	C:\Windows\System32\mfc120chs\b75386f1303e64d8139363b71e44ac16341adf4e	705e9214debeb58fba4ec0bf3cea5a08df142f5bbde6d4b82b6646cf3f2a6622.exe
File created	C:\Windows\System32\authfwcfg\lsass.exe	705e9214debeb58fba4ec0bf3cea5a08df142f5bbde6d4b82b6646cf3f2a6622.exe
File created	C:\Windows\System32\authfwcfg\6203df4a6bafc7c328ee7f6f8ca0a8a838a8a1b9	705e9214debeb58fba4ec0bf3cea5a08df142f5bbde6d4b82b6646cf3f2a6622.exe
File created	C:\Windows\System32\wbem\mstsc\WmiPrvSE.exe	705e9214debeb58fba4ec0bf3cea5a08df142f5bbde6d4b82b6646cf3f2a6622.exe
File created	C:\Windows\System32\wbem\mstsc\24dbde2999530ef5fd907494bc374d663924116c	705e9214debeb58fba4ec0bf3cea5a08df142f5bbde6d4b82b6646cf3f2a6622.exe

Drops file in Windows directory 4 IoCs

description	ioc	Process
File created	C:\Windows\twain_32\7a0fd90576e08807bde2cc57bcf9854bbce05fe3	705e9214debeb58fba4ec0bf3cea5a08df142f5bbde6d4b82b6646cf3f2a6622.exe
File created	C:\Windows\DigitalLocker\ja-JP\wininit.exe	705e9214debeb58fba4ec0bf3cea5a08df142f5bbde6d4b82b6646cf3f2a6622.exe
File created	C:\Windows\DigitalLocker\ja-JP\560854153607923c4c5f107085a7db67be01f252	705e9214debeb58fba4ec0bf3cea5a08df142f5bbde6d4b82b6646cf3f2a6622.exe
File created	C:\Windows\twain_32\explorer.exe	705e9214debeb58fba4ec0bf3cea5a08df142f5bbde6d4b82b6646cf3f2a6622.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 8 IoCs

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

persistence execution

Scheduled Task

T1053.005

pid	Process
2784	schtasks.exe
976	schtasks.exe
2960	schtasks.exe
2940	schtasks.exe
2900	schtasks.exe
864	schtasks.exe
2788	schtasks.exe
2804	schtasks.exe

Suspicious behavior: EnumeratesProcesses 2 IoCs

pid	Process
2820	705e9214debeb58fba4ec0bf3cea5a08df142f5bbde6d4b82b6646cf3f2a6622.exe
1940	lsass.exe

Suspicious use of AdjustPrivilegeToken 2 IoCs

description	pid	Process
Token: SeDebugPrivilege	2820	705e9214debeb58fba4ec0bf3cea5a08df142f5bbde6d4b82b6646cf3f2a6622.exe
Token: SeDebugPrivilege	1940	lsass.exe

Suspicious use of WriteProcessMemory 9 IoCs

description	pid	Process	procid_target
PID 2820 wrote to memory of 784	2820	705e9214debeb58fba4ec0bf3cea5a08df142f5bbde6d4b82b6646cf3f2a6622.exe	39
PID 2820 wrote to memory of 784	2820	705e9214debeb58fba4ec0bf3cea5a08df142f5bbde6d4b82b6646cf3f2a6622.exe	39
PID 2820 wrote to memory of 784	2820	705e9214debeb58fba4ec0bf3cea5a08df142f5bbde6d4b82b6646cf3f2a6622.exe	39
PID 784 wrote to memory of 2412	784	cmd.exe	41
PID 784 wrote to memory of 2412	784	cmd.exe	41
PID 784 wrote to memory of 2412	784	cmd.exe	41
PID 784 wrote to memory of 1940	784	cmd.exe	42
PID 784 wrote to memory of 1940	784	cmd.exe	42
PID 784 wrote to memory of 1940	784	cmd.exe	42

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\705e9214debeb58fba4ec0bf3cea5a08df142f5bbde6d4b82b6646cf3f2a6622.exe
"C:\Users\Admin\AppData\Local\Temp\705e9214debeb58fba4ec0bf3cea5a08df142f5bbde6d4b82b6646cf3f2a6622.exe"
1⤵
- Adds Run key to start application
- Drops file in System32 directory
- Drops file in Windows directory
- Suspicious behavior: EnumeratesProcesses
- Suspicious use of AdjustPrivilegeToken
- Suspicious use of WriteProcessMemory
PID:2820
- C:\Windows\System32\cmd.exe
  "C:\Windows\System32\cmd.exe" /C "C:\Users\Admin\AppData\Local\Temp\qOQVq3qEdc.bat"
  2⤵
  - Suspicious use of WriteProcessMemory
  PID:784
- - C:\Windows\system32\w32tm.exe
    w32tm /stripchart /computer:localhost /period:5 /dataonly /samples:2
    3⤵
    PID:2412
- - C:\Windows\System32\authfwcfg\lsass.exe
    "C:\Windows\System32\authfwcfg\lsass.exe"
    3⤵
    - Executes dropped EXE
    - Suspicious behavior: EnumeratesProcesses
    - Suspicious use of AdjustPrivilegeToken
    PID:1940

C:\Windows\system32\schtasks.exe
schtasks.exe /create /tn "Idle" /sc ONLOGON /tr "'C:\Documents and Settings\Idle.exe'" /rl HIGHEST /f
1⤵
- Process spawned unexpected child process
- Scheduled Task/Job: Scheduled Task
PID:2960

C:\Windows\system32\schtasks.exe
schtasks.exe /create /tn "taskhost" /sc ONLOGON /tr "'C:\Windows\System32\mfc120chs\taskhost.exe'" /rl HIGHEST /f
1⤵
- Process spawned unexpected child process
- Scheduled Task/Job: Scheduled Task
PID:2940

C:\Windows\system32\schtasks.exe
schtasks.exe /create /tn "wininit" /sc ONLOGON /tr "'C:\Windows\DigitalLocker\ja-JP\wininit.exe'" /rl HIGHEST /f
1⤵
- Process spawned unexpected child process
- Scheduled Task/Job: Scheduled Task
PID:2900

C:\Windows\system32\schtasks.exe
schtasks.exe /create /tn "lsm" /sc ONLOGON /tr "'C:\Users\Admin\AppData\LocalLow\Mozilla\lsm.exe'" /rl HIGHEST /f
1⤵
- Process spawned unexpected child process
- Scheduled Task/Job: Scheduled Task
PID:864

C:\Windows\system32\schtasks.exe
schtasks.exe /create /tn "explorer" /sc ONLOGON /tr "'C:\Windows\twain_32\explorer.exe'" /rl HIGHEST /f
1⤵
- Process spawned unexpected child process
- Scheduled Task/Job: Scheduled Task
PID:2788

C:\Windows\system32\schtasks.exe
schtasks.exe /create /tn "lsass" /sc ONLOGON /tr "'C:\Windows\System32\authfwcfg\lsass.exe'" /rl HIGHEST /f
1⤵
- Process spawned unexpected child process
- Scheduled Task/Job: Scheduled Task
PID:2804

C:\Windows\system32\schtasks.exe
schtasks.exe /create /tn "WmiPrvSE" /sc ONLOGON /tr "'C:\Windows\System32\wbem\mstsc\WmiPrvSE.exe'" /rl HIGHEST /f
1⤵
- Process spawned unexpected child process
- Scheduled Task/Job: Scheduled Task
PID:2784

C:\Windows\system32\schtasks.exe
schtasks.exe /create /tn "705e9214debeb58fba4ec0bf3cea5a08df142f5bbde6d4b82b6646cf3f2a6622" /sc ONLOGON /tr "'C:\Users\Admin\AppData\Local\Temp\dd_vcredistUI0838\705e9214debeb58fba4ec0bf3cea5a08df142f5bbde6d4b82b6646cf3f2a6622.exe'" /rl HIGHEST /f
1⤵
- Process spawned unexpected child process
- Scheduled Task/Job: Scheduled Task
PID:976

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

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Downloads

C:\Users\Admin\AppData\Local\Temp\qOQVq3qEdc.bat

Filesize
203B

MD5
15c9000d83e3df766b6fa20d826dee64

SHA1
000eb779447c96203b5ecf7a28d38efc317a5956

SHA256
dd080cc5500356eeef1c946f7f8fc3b79514930d0e826ec529e3577ad1edca07

SHA512
fca978c4883662821c03299be98dbeec3973e1881aa1b31cf30d3da932e19d7be2647d8ccabea83b039aea54129201cab77de8c2e21959c3dba8f060c837bec3

Download Submit
C:\Windows\twain_32\explorer.exe

Filesize
547KB

MD5
637920e868b2367c5e6517ee4744d3c9

SHA1
09f66f5db717cf9df695bb89d8e2643229379969

SHA256
705e9214debeb58fba4ec0bf3cea5a08df142f5bbde6d4b82b6646cf3f2a6622

SHA512
92846cd4ee57c2be2c5146692defab8f5b4cb58eed5f44ba13b3aa36f537f8454090929618f4ec9104ee90cba8af9aa2340f89dac3ec3d488f30682af2760443

Download Submit
memory/1940-27-0x0000000000360000-0x00000000003F0000-memory.dmp

Filesize
576KB

Download
memory/1940-28-0x0000000000140000-0x000000000014C000-memory.dmp

Filesize
48KB

Download
memory/1940-29-0x0000000000150000-0x000000000015C000-memory.dmp

Filesize
48KB

Download
memory/1940-30-0x00000000002C0000-0x00000000002CE000-memory.dmp

Filesize
56KB

Download
memory/2820-0-0x000007FEF6423000-0x000007FEF6424000-memory.dmp

Filesize
4KB

Download
memory/2820-1-0x0000000000C20000-0x0000000000CB0000-memory.dmp

Filesize
576KB

Download
memory/2820-2-0x000007FEF6420000-0x000007FEF6E0C000-memory.dmp

Filesize
9.9MB

Download
memory/2820-24-0x000007FEF6420000-0x000007FEF6E0C000-memory.dmp

Filesize
9.9MB

Download

Analysis

Sharing

General

Malware Config

Signatures

Processes

Network

MITRE ATT&CK Enterprise v15

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Downloads