dcrat | f732f0392878698cc5d43a9d8129c3b16eaa6cc4b50a79b548a32dde7a0456bc

General

Target

7f9578cac30087f4675bbcb003ed8b5e.exe
Size

2.3MB
MD5

7f9578cac30087f4675bbcb003ed8b5e
SHA1

b42579f5efbc5efa18eb442c2fc61fa90d988718
SHA256

f732f0392878698cc5d43a9d8129c3b16eaa6cc4b50a79b548a32dde7a0456bc
SHA512

e2933cef7a5fe25e230e66473acf663859441cf159269db345b12ff082f88f555bf56ec565ba42c61f61db1cc742cb63f2eb77cf37ac9512b7587a56c0f4f8d1
SSDEEP

24576:8ITVuaZN/8RjsOUQ1svsFlreQmkaZrtdYetEfUhdHWIVqk+dKLkHXBwYlINmm4Uh:8BSe/UwPItdrtEfUhdHWIVnTLUmz0kB

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 9 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	1300	1048	schtasks.exe	86
Parent C:\Windows\system32\wbem\wmiprvse.exe is not expected to spawn this process	2184	1048	schtasks.exe	86
Parent C:\Windows\system32\wbem\wmiprvse.exe is not expected to spawn this process	2460	1048	schtasks.exe	86
Parent C:\Windows\system32\wbem\wmiprvse.exe is not expected to spawn this process	4292	1048	schtasks.exe	86
Parent C:\Windows\system32\wbem\wmiprvse.exe is not expected to spawn this process	3784	1048	schtasks.exe	86
Parent C:\Windows\system32\wbem\wmiprvse.exe is not expected to spawn this process	3116	1048	schtasks.exe	86
Parent C:\Windows\system32\wbem\wmiprvse.exe is not expected to spawn this process	4792	1048	schtasks.exe	86
Parent C:\Windows\system32\wbem\wmiprvse.exe is not expected to spawn this process	4272	1048	schtasks.exe	86
Parent C:\Windows\system32\wbem\wmiprvse.exe is not expected to spawn this process	3220	1048	schtasks.exe	86

DCRat payload 2 IoCs

Detects payload of DCRat, commonly dropped by NSIS installers.

rat

resource	yara_rule
behavioral2/memory/3764-1-0x0000000000450000-0x000000000069E000-memory.dmp	dcrat
behavioral2/files/0x000a000000023b65-24.dat	dcrat

Checks computer location settings 2 TTPs 1 IoCs

Looks up country code configured in the registry, likely geofence.

Query Registry

T1012

System Information Discovery

T1082

description	ioc	Process
Key value queried	\REGISTRY\USER\S-1-5-21-805940606-1861219160-370298170-1000\Control Panel\International\Geo\Nation	7f9578cac30087f4675bbcb003ed8b5e.exe

Executes dropped EXE 1 IoCs

pid	Process
2960	smss.exe

Drops file in Program Files directory 4 IoCs

description	ioc	Process
File created	C:\Program Files\Reference Assemblies\Microsoft\Framework\TextInputHost.exe	7f9578cac30087f4675bbcb003ed8b5e.exe
File created	C:\Program Files\Reference Assemblies\Microsoft\Framework\22eafd247d37c3	7f9578cac30087f4675bbcb003ed8b5e.exe
File created	C:\Program Files\Windows Sidebar\smss.exe	7f9578cac30087f4675bbcb003ed8b5e.exe
File created	C:\Program Files\Windows Sidebar\69ddcba757bf72	7f9578cac30087f4675bbcb003ed8b5e.exe

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

System Information Discovery
T1082

Modifies registry class 1 IoCs

description	ioc	Process
Key created	\REGISTRY\USER\S-1-5-21-805940606-1861219160-370298170-1000_Classes\Local Settings	7f9578cac30087f4675bbcb003ed8b5e.exe

Scheduled Task/Job: Scheduled Task 1 TTPs 9 IoCs

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

persistence execution

Scheduled Task

T1053.005

pid	Process
3784	schtasks.exe
3116	schtasks.exe
4272	schtasks.exe
1300	schtasks.exe
2184	schtasks.exe
2460	schtasks.exe
4292	schtasks.exe
4792	schtasks.exe
3220	schtasks.exe

Suspicious behavior: EnumeratesProcesses 2 IoCs

pid	Process
3764	7f9578cac30087f4675bbcb003ed8b5e.exe
2960	smss.exe

Suspicious use of AdjustPrivilegeToken 2 IoCs

description	pid	Process
Token: SeDebugPrivilege	3764	7f9578cac30087f4675bbcb003ed8b5e.exe
Token: SeDebugPrivilege	2960	smss.exe

Suspicious use of WriteProcessMemory 6 IoCs

description	pid	Process	procid_target
PID 3764 wrote to memory of 1640	3764	7f9578cac30087f4675bbcb003ed8b5e.exe	97
PID 3764 wrote to memory of 1640	3764	7f9578cac30087f4675bbcb003ed8b5e.exe	97
PID 1640 wrote to memory of 2852	1640	cmd.exe	99
PID 1640 wrote to memory of 2852	1640	cmd.exe	99
PID 1640 wrote to memory of 2960	1640	cmd.exe	103
PID 1640 wrote to memory of 2960	1640	cmd.exe	103

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\7f9578cac30087f4675bbcb003ed8b5e.exe
"C:\Users\Admin\AppData\Local\Temp\7f9578cac30087f4675bbcb003ed8b5e.exe"
1⤵
- Checks computer location settings
- Drops file in Program Files directory
- Modifies registry class
- Suspicious behavior: EnumeratesProcesses
- Suspicious use of AdjustPrivilegeToken
- Suspicious use of WriteProcessMemory
PID:3764
- C:\Windows\System32\cmd.exe
  "C:\Windows\System32\cmd.exe" /C "C:\Users\Admin\AppData\Local\Temp\17OcEwNUD6.bat"
  2⤵
  - Suspicious use of WriteProcessMemory
  PID:1640
- - C:\Windows\system32\w32tm.exe
    w32tm /stripchart /computer:localhost /period:5 /dataonly /samples:2
    3⤵
    PID:2852
- - C:\Program Files\Windows Sidebar\smss.exe
    "C:\Program Files\Windows Sidebar\smss.exe"
    3⤵
    - Executes dropped EXE
    - Suspicious behavior: EnumeratesProcesses
    - Suspicious use of AdjustPrivilegeToken
    PID:2960

C:\Windows\system32\schtasks.exe
schtasks.exe /create /tn "TextInputHostT" /sc MINUTE /mo 9 /tr "'C:\Users\Default\TextInputHost.exe'" /f
1⤵
- Process spawned unexpected child process
- Scheduled Task/Job: Scheduled Task
PID:1300

C:\Windows\system32\schtasks.exe
schtasks.exe /create /tn "TextInputHost" /sc ONLOGON /tr "'C:\Users\Default\TextInputHost.exe'" /rl HIGHEST /f
1⤵
- Process spawned unexpected child process
- Scheduled Task/Job: Scheduled Task
PID:2184

C:\Windows\system32\schtasks.exe
schtasks.exe /create /tn "TextInputHostT" /sc MINUTE /mo 14 /tr "'C:\Users\Default\TextInputHost.exe'" /rl HIGHEST /f
1⤵
- Process spawned unexpected child process
- Scheduled Task/Job: Scheduled Task
PID:2460

C:\Windows\system32\schtasks.exe
schtasks.exe /create /tn "TextInputHostT" /sc MINUTE /mo 12 /tr "'C:\Program Files\Reference Assemblies\Microsoft\Framework\TextInputHost.exe'" /f
1⤵
- Process spawned unexpected child process
- Scheduled Task/Job: Scheduled Task
PID:4292

C:\Windows\system32\schtasks.exe
schtasks.exe /create /tn "TextInputHost" /sc ONLOGON /tr "'C:\Program Files\Reference Assemblies\Microsoft\Framework\TextInputHost.exe'" /rl HIGHEST /f
1⤵
- Process spawned unexpected child process
- Scheduled Task/Job: Scheduled Task
PID:3784

C:\Windows\system32\schtasks.exe
schtasks.exe /create /tn "TextInputHostT" /sc MINUTE /mo 6 /tr "'C:\Program Files\Reference Assemblies\Microsoft\Framework\TextInputHost.exe'" /rl HIGHEST /f
1⤵
- Process spawned unexpected child process
- Scheduled Task/Job: Scheduled Task
PID:3116

C:\Windows\system32\schtasks.exe
schtasks.exe /create /tn "smsss" /sc MINUTE /mo 12 /tr "'C:\Program Files\Windows Sidebar\smss.exe'" /f
1⤵
- Process spawned unexpected child process
- Scheduled Task/Job: Scheduled Task
PID:4792

C:\Windows\system32\schtasks.exe
schtasks.exe /create /tn "smss" /sc ONLOGON /tr "'C:\Program Files\Windows Sidebar\smss.exe'" /rl HIGHEST /f
1⤵
- Process spawned unexpected child process
- Scheduled Task/Job: Scheduled Task
PID:4272

C:\Windows\system32\schtasks.exe
schtasks.exe /create /tn "smsss" /sc MINUTE /mo 7 /tr "'C:\Program Files\Windows Sidebar\smss.exe'" /rl HIGHEST /f
1⤵
- Process spawned unexpected child process
- Scheduled Task/Job: Scheduled Task
PID:3220

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

2

T1012

System Information Discovery

2

T1082

Lateral Movement

Collection

Command and Control

Exfiltration

Impact

Replay Monitor

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Downloads

C:\Program Files\Windows Sidebar\smss.exe

Filesize
2.3MB

MD5
7f9578cac30087f4675bbcb003ed8b5e

SHA1
b42579f5efbc5efa18eb442c2fc61fa90d988718

SHA256
f732f0392878698cc5d43a9d8129c3b16eaa6cc4b50a79b548a32dde7a0456bc

SHA512
e2933cef7a5fe25e230e66473acf663859441cf159269db345b12ff082f88f555bf56ec565ba42c61f61db1cc742cb63f2eb77cf37ac9512b7587a56c0f4f8d1

Download Submit
C:\Users\Admin\AppData\Local\Temp\17OcEwNUD6.bat

Filesize
206B

MD5
a856ef061f382a9fca290641e8b0ef62

SHA1
7d37156d7ce1512032952ab8dab797b66f3d2e15

SHA256
d4e728dfb07a18e448c4fbddc684a294a18fa9b43b3467453e2038f4c858e454

SHA512
4c4191980150a9a3920b1a3d93d1c7c24baca54501bbba62b194eb58b8ddafe2ee6d5a5ed4c1518f20abf3c128ff3bb18b1fd16deedd24bdb9088e9524e78fe5

Download Submit
memory/2960-27-0x000000001D5F0000-0x000000001D602000-memory.dmp

Filesize
72KB

Download
memory/2960-26-0x000000001D5A0000-0x000000001D5F6000-memory.dmp

Filesize
344KB

Download
memory/3764-4-0x0000000002A40000-0x0000000002A90000-memory.dmp

Filesize
320KB

Download
memory/3764-5-0x00000000028B0000-0x00000000028C6000-memory.dmp

Filesize
88KB

Download
memory/3764-0-0x00007FFA237A3000-0x00007FFA237A5000-memory.dmp

Filesize
8KB

Download
memory/3764-7-0x0000000002AA0000-0x0000000002AB2000-memory.dmp

Filesize
72KB

Download
memory/3764-8-0x000000001C230000-0x000000001C758000-memory.dmp

Filesize
5.2MB

Download
memory/3764-9-0x000000001B3A0000-0x000000001B3AE000-memory.dmp

Filesize
56KB

Download
memory/3764-21-0x00007FFA237A0000-0x00007FFA24261000-memory.dmp

Filesize
10.8MB

Download
memory/3764-6-0x00000000029F0000-0x0000000002A46000-memory.dmp

Filesize
344KB

Download
memory/3764-3-0x0000000002890000-0x00000000028AC000-memory.dmp

Filesize
112KB

Download
memory/3764-2-0x00007FFA237A0000-0x00007FFA24261000-memory.dmp

Filesize
10.8MB

Download
memory/3764-1-0x0000000000450000-0x000000000069E000-memory.dmp

Filesize
2.3MB

Download

Analysis

Sharing

General

Malware Config

Signatures

Processes

Network

MITRE ATT&CK Enterprise v15

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Downloads