dcrat | 1a23b06a1a5708eb5557d8ba9c15d4c4608875a9d128d358a75f2c4344081459

General

Target

1a23b06a1a5708eb5557d8ba9c15d4c4608875a9d128d358a75f2c4344081459.exe
Size

2.1MB
MD5

96affeab8e13743e57269977f1805472
SHA1

8935028d2abde57185acd3e1f59d831cc6ac5bc0
SHA256

1a23b06a1a5708eb5557d8ba9c15d4c4608875a9d128d358a75f2c4344081459
SHA512

a8a1c5c302f6d51a7d390bf47ee0b4e2513498fec1081ffd2ec819133149c59c6b6bac7f6c8e7d7bd0e557c4f77f2789324cae8ccda90e1d60b3906b5d448fea
SSDEEP

49152:Cx55PUIP9xbGEfCErDBBDNvlbslAIETt1TIo3sa:klP9hAqXN6EHTj3sa

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 7 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	2820	2780	schtasks.exe	30
Parent C:\Windows\system32\wbem\wmiprvse.exe is not expected to spawn this process	2564	2780	schtasks.exe	30
Parent C:\Windows\system32\wbem\wmiprvse.exe is not expected to spawn this process	2592	2780	schtasks.exe	30
Parent C:\Windows\system32\wbem\wmiprvse.exe is not expected to spawn this process	2572	2780	schtasks.exe	30
Parent C:\Windows\system32\wbem\wmiprvse.exe is not expected to spawn this process	3056	2780	schtasks.exe	30
Parent C:\Windows\system32\wbem\wmiprvse.exe is not expected to spawn this process	1020	2780	schtasks.exe	30
Parent C:\Windows\system32\wbem\wmiprvse.exe is not expected to spawn this process	1168	2780	schtasks.exe	30

DCRat payload 3 IoCs

Detects payload of DCRat, commonly dropped by NSIS installers.

rat

resource	yara_rule
behavioral1/memory/2248-1-0x0000000000AF0000-0x0000000000D1C000-memory.dmp	dcrat
behavioral1/files/0x0006000000016df5-11.dat	dcrat
behavioral1/memory/1392-23-0x00000000009E0000-0x0000000000C0C000-memory.dmp	dcrat

Executes dropped EXE 1 IoCs

pid	Process
1392	services.exe

Adds Run key to start application 2 TTPs 7 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\csrss = "\"C:\\Windows\\System32\\hotplug\\csrss.exe\""	1a23b06a1a5708eb5557d8ba9c15d4c4608875a9d128d358a75f2c4344081459.exe
Set value (str)	\REGISTRY\MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Run\lsass = "\"C:\\ProgramData\\Microsoft Help\\lsass.exe\""	1a23b06a1a5708eb5557d8ba9c15d4c4608875a9d128d358a75f2c4344081459.exe
Set value (str)	\REGISTRY\MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Run\lsass = "\"C:\\Windows\\System32\\hhsetup\\lsass.exe\""	1a23b06a1a5708eb5557d8ba9c15d4c4608875a9d128d358a75f2c4344081459.exe
Set value (str)	\REGISTRY\MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Run\explorer = "\"C:\\Windows\\splwow64\\explorer.exe\""	1a23b06a1a5708eb5557d8ba9c15d4c4608875a9d128d358a75f2c4344081459.exe
Set value (str)	\REGISTRY\MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Run\services = "\"C:\\Windows\\System32\\iaspolcy\\services.exe\""	1a23b06a1a5708eb5557d8ba9c15d4c4608875a9d128d358a75f2c4344081459.exe
Set value (str)	\REGISTRY\MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Run\WmiPrvSE = "\"C:\\Recovery\\209d6542-69f6-11ef-b491-62cb582c238c\\WmiPrvSE.exe\""	1a23b06a1a5708eb5557d8ba9c15d4c4608875a9d128d358a75f2c4344081459.exe
Set value (str)	\REGISTRY\MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Run\dwm = "\"C:\\Users\\Admin\\Start Menu\\dwm.exe\""	1a23b06a1a5708eb5557d8ba9c15d4c4608875a9d128d358a75f2c4344081459.exe

Drops file in System32 directory 6 IoCs

description	ioc	Process
File created	C:\Windows\System32\hotplug\csrss.exe	1a23b06a1a5708eb5557d8ba9c15d4c4608875a9d128d358a75f2c4344081459.exe
File created	C:\Windows\System32\hotplug\886983d96e3d3e31032c679b2d4ea91b6c05afef	1a23b06a1a5708eb5557d8ba9c15d4c4608875a9d128d358a75f2c4344081459.exe
File created	C:\Windows\System32\hhsetup\lsass.exe	1a23b06a1a5708eb5557d8ba9c15d4c4608875a9d128d358a75f2c4344081459.exe
File created	C:\Windows\System32\hhsetup\6203df4a6bafc7c328ee7f6f8ca0a8a838a8a1b9	1a23b06a1a5708eb5557d8ba9c15d4c4608875a9d128d358a75f2c4344081459.exe
File created	C:\Windows\System32\iaspolcy\services.exe	1a23b06a1a5708eb5557d8ba9c15d4c4608875a9d128d358a75f2c4344081459.exe
File created	C:\Windows\System32\iaspolcy\c5b4cb5e9653cce737f29f72ba880dd4c4bab27d	1a23b06a1a5708eb5557d8ba9c15d4c4608875a9d128d358a75f2c4344081459.exe

Drops file in Windows directory 2 IoCs

description	ioc	Process
File created	C:\Windows\splwow64\explorer.exe	1a23b06a1a5708eb5557d8ba9c15d4c4608875a9d128d358a75f2c4344081459.exe
File created	C:\Windows\splwow64\7a0fd90576e08807bde2cc57bcf9854bbce05fe3	1a23b06a1a5708eb5557d8ba9c15d4c4608875a9d128d358a75f2c4344081459.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 7 IoCs

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

persistence execution

Scheduled Task

T1053.005

pid	Process
1020	schtasks.exe
1168	schtasks.exe
2820	schtasks.exe
2564	schtasks.exe
2592	schtasks.exe
2572	schtasks.exe
3056	schtasks.exe

Suspicious behavior: EnumeratesProcesses 3 IoCs

pid	Process
2248	1a23b06a1a5708eb5557d8ba9c15d4c4608875a9d128d358a75f2c4344081459.exe
1392	services.exe
1392	services.exe

Suspicious use of AdjustPrivilegeToken 2 IoCs

description	pid	Process
Token: SeDebugPrivilege	2248	1a23b06a1a5708eb5557d8ba9c15d4c4608875a9d128d358a75f2c4344081459.exe
Token: SeDebugPrivilege	1392	services.exe

Suspicious use of WriteProcessMemory 3 IoCs

description	pid	Process	procid_target
PID 2248 wrote to memory of 1392	2248	1a23b06a1a5708eb5557d8ba9c15d4c4608875a9d128d358a75f2c4344081459.exe	38
PID 2248 wrote to memory of 1392	2248	1a23b06a1a5708eb5557d8ba9c15d4c4608875a9d128d358a75f2c4344081459.exe	38
PID 2248 wrote to memory of 1392	2248	1a23b06a1a5708eb5557d8ba9c15d4c4608875a9d128d358a75f2c4344081459.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\1a23b06a1a5708eb5557d8ba9c15d4c4608875a9d128d358a75f2c4344081459.exe
"C:\Users\Admin\AppData\Local\Temp\1a23b06a1a5708eb5557d8ba9c15d4c4608875a9d128d358a75f2c4344081459.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:2248
- C:\Windows\System32\iaspolcy\services.exe
  "C:\Windows\System32\iaspolcy\services.exe"
  2⤵
  - Executes dropped EXE
  - Suspicious behavior: EnumeratesProcesses
  - Suspicious use of AdjustPrivilegeToken
  PID:1392

C:\Windows\system32\schtasks.exe
schtasks.exe /create /tn "dwm" /sc ONLOGON /tr "'C:\Users\Admin\Start Menu\dwm.exe'" /rl HIGHEST /f
1⤵
- Process spawned unexpected child process
- Scheduled Task/Job: Scheduled Task
PID:2820

C:\Windows\system32\schtasks.exe
schtasks.exe /create /tn "csrss" /sc ONLOGON /tr "'C:\Windows\System32\hotplug\csrss.exe'" /rl HIGHEST /f
1⤵
- Process spawned unexpected child process
- Scheduled Task/Job: Scheduled Task
PID:2564

C:\Windows\system32\schtasks.exe
schtasks.exe /create /tn "lsass" /sc ONLOGON /tr "'C:\ProgramData\Microsoft Help\lsass.exe'" /rl HIGHEST /f
1⤵
- Process spawned unexpected child process
- Scheduled Task/Job: Scheduled Task
PID:2592

C:\Windows\system32\schtasks.exe
schtasks.exe /create /tn "lsass" /sc ONLOGON /tr "'C:\Windows\System32\hhsetup\lsass.exe'" /rl HIGHEST /f
1⤵
- Process spawned unexpected child process
- Scheduled Task/Job: Scheduled Task
PID:2572

C:\Windows\system32\schtasks.exe
schtasks.exe /create /tn "explorer" /sc ONLOGON /tr "'C:\Windows\splwow64\explorer.exe'" /rl HIGHEST /f
1⤵
- Process spawned unexpected child process
- Scheduled Task/Job: Scheduled Task
PID:3056

C:\Windows\system32\schtasks.exe
schtasks.exe /create /tn "services" /sc ONLOGON /tr "'C:\Windows\System32\iaspolcy\services.exe'" /rl HIGHEST /f
1⤵
- Process spawned unexpected child process
- Scheduled Task/Job: Scheduled Task
PID:1020

C:\Windows\system32\schtasks.exe
schtasks.exe /create /tn "WmiPrvSE" /sc ONLOGON /tr "'C:\Recovery\209d6542-69f6-11ef-b491-62cb582c238c\WmiPrvSE.exe'" /rl HIGHEST /f
1⤵
- Process spawned unexpected child process
- Scheduled Task/Job: Scheduled Task
PID:1168

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

Replay Monitor

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Downloads

C:\Windows\splwow64\explorer.exe

Filesize
2.1MB

MD5
96affeab8e13743e57269977f1805472

SHA1
8935028d2abde57185acd3e1f59d831cc6ac5bc0

SHA256
1a23b06a1a5708eb5557d8ba9c15d4c4608875a9d128d358a75f2c4344081459

SHA512
a8a1c5c302f6d51a7d390bf47ee0b4e2513498fec1081ffd2ec819133149c59c6b6bac7f6c8e7d7bd0e557c4f77f2789324cae8ccda90e1d60b3906b5d448fea

Download Submit
memory/1392-31-0x00000000009D0000-0x00000000009D8000-memory.dmp

Filesize
32KB

Download
memory/1392-23-0x00000000009E0000-0x0000000000C0C000-memory.dmp

Filesize
2.2MB

Download
memory/1392-25-0x0000000000160000-0x000000000016C000-memory.dmp

Filesize
48KB

Download
memory/1392-36-0x0000000002370000-0x000000000237A000-memory.dmp

Filesize
40KB

Download
memory/1392-29-0x0000000000970000-0x00000000009C6000-memory.dmp

Filesize
344KB

Download
memory/1392-28-0x0000000000390000-0x000000000039E000-memory.dmp

Filesize
56KB

Download
memory/1392-27-0x0000000000180000-0x0000000000188000-memory.dmp

Filesize
32KB

Download
memory/1392-30-0x00000000009C0000-0x00000000009CA000-memory.dmp

Filesize
40KB

Download
memory/1392-32-0x00000000022B0000-0x00000000022BC000-memory.dmp

Filesize
48KB

Download
memory/1392-34-0x00000000022D0000-0x00000000022D8000-memory.dmp

Filesize
32KB

Download
memory/1392-26-0x0000000000170000-0x0000000000178000-memory.dmp

Filesize
32KB

Download
memory/1392-35-0x00000000022E0000-0x00000000022E8000-memory.dmp

Filesize
32KB

Download
memory/1392-33-0x00000000022C0000-0x00000000022C8000-memory.dmp

Filesize
32KB

Download
memory/2248-0-0x000007FEF6453000-0x000007FEF6454000-memory.dmp

Filesize
4KB

Download
memory/2248-2-0x000007FEF6450000-0x000007FEF6E3C000-memory.dmp

Filesize
9.9MB

Download
memory/2248-1-0x0000000000AF0000-0x0000000000D1C000-memory.dmp

Filesize
2.2MB

Download
memory/2248-24-0x000007FEF6450000-0x000007FEF6E3C000-memory.dmp

Filesize
9.9MB

Download

Analysis

Sharing

General

Malware Config

Signatures

Processes

Network

MITRE ATT&CK Enterprise v15

Replay Monitor

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Downloads