dcrat | f6fffabc85ab9bfd39576690b7107ddc421d458f6021a754a0b69969ba6e51cf

General

Target

f6fffabc85ab9bfd39576690b7107ddc421d458f6021a754a0b69969ba6e51cfN.exe
Size

1.2MB
MD5

d3b579a658327ea6b0b270989961d4a0
SHA1

4f973046dd649eb484960bb5decdcb1854eb759a
SHA256

f6fffabc85ab9bfd39576690b7107ddc421d458f6021a754a0b69969ba6e51cf
SHA512

0ed2079276cef4e973e2b0166f4f57ce124c43d2d866a772c78a8a801458256fdb1d233cb0a047dd2e8ee6b09ab66505f75073ed241f73f9944d14078b5d4468
SSDEEP

24576:v+r+6mj4wnm4qDfidSA440wOkTM5lcQANNVRIQPc2UWab:v++6mJqDuQd52QANNVRIQ8

Score

10^/10

dcrat infostealer 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.

description	pid	pid_target	Process	procid_target
Parent C:\Windows\system32\wbem\wmiprvse.exe is not expected to spawn this process	2880	2764	schtasks.exe	31
Parent C:\Windows\system32\wbem\wmiprvse.exe is not expected to spawn this process	2384	2764	schtasks.exe	31
Parent C:\Windows\system32\wbem\wmiprvse.exe is not expected to spawn this process	2800	2764	schtasks.exe	31
Parent C:\Windows\system32\wbem\wmiprvse.exe is not expected to spawn this process	2720	2764	schtasks.exe	31
Parent C:\Windows\system32\wbem\wmiprvse.exe is not expected to spawn this process	2588	2764	schtasks.exe	31
Parent C:\Windows\system32\wbem\wmiprvse.exe is not expected to spawn this process	2544	2764	schtasks.exe	31

DCRat payload 3 IoCs

Detects payload of DCRat, commonly dropped by NSIS installers.

rat

resource	yara_rule
behavioral1/memory/2956-1-0x0000000001310000-0x0000000001442000-memory.dmp	dcrat
behavioral1/files/0x0007000000016d06-14.dat	dcrat
behavioral1/memory/2664-17-0x0000000000C50000-0x0000000000D82000-memory.dmp	dcrat

Executes dropped EXE 1 IoCs

pid	Process
2664	smss.exe

Drops file in Program Files directory 5 IoCs

description	ioc	Process
File created	C:\Program Files\Mozilla Firefox\smss.exe	f6fffabc85ab9bfd39576690b7107ddc421d458f6021a754a0b69969ba6e51cfN.exe
File created	C:\Program Files\Mozilla Firefox\69ddcba757bf72	f6fffabc85ab9bfd39576690b7107ddc421d458f6021a754a0b69969ba6e51cfN.exe
File created	C:\Program Files\Windows Photo Viewer\ja-JP\dwm.exe	f6fffabc85ab9bfd39576690b7107ddc421d458f6021a754a0b69969ba6e51cfN.exe
File opened for modification	C:\Program Files\Windows Photo Viewer\ja-JP\dwm.exe	f6fffabc85ab9bfd39576690b7107ddc421d458f6021a754a0b69969ba6e51cfN.exe
File created	C:\Program Files\Windows Photo Viewer\ja-JP\6cb0b6c459d5d3	f6fffabc85ab9bfd39576690b7107ddc421d458f6021a754a0b69969ba6e51cfN.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

pid	Process
2880	schtasks.exe
2384	schtasks.exe
2800	schtasks.exe
2720	schtasks.exe
2588	schtasks.exe
2544	schtasks.exe

Suspicious behavior: EnumeratesProcesses 2 IoCs

pid	Process
2956	f6fffabc85ab9bfd39576690b7107ddc421d458f6021a754a0b69969ba6e51cfN.exe
2664	smss.exe

Suspicious use of AdjustPrivilegeToken 2 IoCs

description	pid	Process
Token: SeDebugPrivilege	2956	f6fffabc85ab9bfd39576690b7107ddc421d458f6021a754a0b69969ba6e51cfN.exe
Token: SeDebugPrivilege	2664	smss.exe

Suspicious use of WriteProcessMemory 3 IoCs

description	pid	Process	procid_target
PID 2956 wrote to memory of 2664	2956	f6fffabc85ab9bfd39576690b7107ddc421d458f6021a754a0b69969ba6e51cfN.exe	38
PID 2956 wrote to memory of 2664	2956	f6fffabc85ab9bfd39576690b7107ddc421d458f6021a754a0b69969ba6e51cfN.exe	38
PID 2956 wrote to memory of 2664	2956	f6fffabc85ab9bfd39576690b7107ddc421d458f6021a754a0b69969ba6e51cfN.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\f6fffabc85ab9bfd39576690b7107ddc421d458f6021a754a0b69969ba6e51cfN.exe
"C:\Users\Admin\AppData\Local\Temp\f6fffabc85ab9bfd39576690b7107ddc421d458f6021a754a0b69969ba6e51cfN.exe"
1⤵
- Drops file in Program Files directory
- Suspicious behavior: EnumeratesProcesses
- Suspicious use of AdjustPrivilegeToken
- Suspicious use of WriteProcessMemory
PID:2956
- C:\Program Files\Mozilla Firefox\smss.exe
  "C:\Program Files\Mozilla Firefox\smss.exe"
  2⤵
  - Executes dropped EXE
  - Suspicious behavior: EnumeratesProcesses
  - Suspicious use of AdjustPrivilegeToken
  PID:2664

C:\Windows\system32\schtasks.exe
schtasks.exe /create /tn "dwmd" /sc MINUTE /mo 9 /tr "'C:\Program Files\Windows Photo Viewer\ja-JP\dwm.exe'" /f
1⤵
- Process spawned unexpected child process
- Scheduled Task/Job: Scheduled Task
PID:2880

C:\Windows\system32\schtasks.exe
schtasks.exe /create /tn "dwm" /sc ONLOGON /tr "'C:\Program Files\Windows Photo Viewer\ja-JP\dwm.exe'" /rl HIGHEST /f
1⤵
- Process spawned unexpected child process
- Scheduled Task/Job: Scheduled Task
PID:2384

C:\Windows\system32\schtasks.exe
schtasks.exe /create /tn "dwmd" /sc MINUTE /mo 12 /tr "'C:\Program Files\Windows Photo Viewer\ja-JP\dwm.exe'" /rl HIGHEST /f
1⤵
- Process spawned unexpected child process
- Scheduled Task/Job: Scheduled Task
PID:2800

C:\Windows\system32\schtasks.exe
schtasks.exe /create /tn "smsss" /sc MINUTE /mo 11 /tr "'C:\Program Files\Mozilla Firefox\smss.exe'" /f
1⤵
- Process spawned unexpected child process
- Scheduled Task/Job: Scheduled Task
PID:2720

C:\Windows\system32\schtasks.exe
schtasks.exe /create /tn "smss" /sc ONLOGON /tr "'C:\Program Files\Mozilla Firefox\smss.exe'" /rl HIGHEST /f
1⤵
- Process spawned unexpected child process
- Scheduled Task/Job: Scheduled Task
PID:2588

C:\Windows\system32\schtasks.exe
schtasks.exe /create /tn "smsss" /sc MINUTE /mo 10 /tr "'C:\Program Files\Mozilla Firefox\smss.exe'" /rl HIGHEST /f
1⤵
- Process spawned unexpected child process
- Scheduled Task/Job: Scheduled Task
PID:2544

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

Scheduled Task/Job

1

T1053

Scheduled Task

1

T1053.005

Defense Evasion

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:\Program Files\Mozilla Firefox\smss.exe

Filesize
1.2MB

MD5
d3b579a658327ea6b0b270989961d4a0

SHA1
4f973046dd649eb484960bb5decdcb1854eb759a

SHA256
f6fffabc85ab9bfd39576690b7107ddc421d458f6021a754a0b69969ba6e51cf

SHA512
0ed2079276cef4e973e2b0166f4f57ce124c43d2d866a772c78a8a801458256fdb1d233cb0a047dd2e8ee6b09ab66505f75073ed241f73f9944d14078b5d4468

Download Submit
memory/2664-17-0x0000000000C50000-0x0000000000D82000-memory.dmp

Filesize
1.2MB

Download
memory/2956-0-0x000007FEF5633000-0x000007FEF5634000-memory.dmp

Filesize
4KB

Download
memory/2956-1-0x0000000001310000-0x0000000001442000-memory.dmp

Filesize
1.2MB

Download
memory/2956-2-0x000007FEF5630000-0x000007FEF601C000-memory.dmp

Filesize
9.9MB

Download
memory/2956-3-0x0000000000530000-0x000000000054C000-memory.dmp

Filesize
112KB

Download
memory/2956-4-0x0000000000AF0000-0x0000000000B06000-memory.dmp

Filesize
88KB

Download
memory/2956-5-0x0000000000B50000-0x0000000000B5C000-memory.dmp

Filesize
48KB

Download
memory/2956-16-0x000007FEF5630000-0x000007FEF601C000-memory.dmp

Filesize
9.9MB

Download

Analysis

Sharing

General

Malware Config

Signatures

Processes

Network

MITRE ATT&CK Enterprise v15

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Downloads