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 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	3716	1728	schtasks.exe	83
Parent C:\Windows\system32\wbem\wmiprvse.exe is not expected to spawn this process	5008	1728	schtasks.exe	83
Parent C:\Windows\system32\wbem\wmiprvse.exe is not expected to spawn this process	4120	1728	schtasks.exe	83
Parent C:\Windows\system32\wbem\wmiprvse.exe is not expected to spawn this process	4388	1728	schtasks.exe	83
Parent C:\Windows\system32\wbem\wmiprvse.exe is not expected to spawn this process	4108	1728	schtasks.exe	83
Parent C:\Windows\system32\wbem\wmiprvse.exe is not expected to spawn this process	1752	1728	schtasks.exe	83

DCRat payload 2 IoCs

Detects payload of DCRat, commonly dropped by NSIS installers.

rat

resource	yara_rule
behavioral2/memory/4948-1-0x0000000000880000-0x0000000000AAC000-memory.dmp	dcrat
behavioral2/files/0x000a000000023b9b-11.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-1-5-21-940901362-3608833189-1915618603-1000\Control Panel\International\Geo\Nation	1a23b06a1a5708eb5557d8ba9c15d4c4608875a9d128d358a75f2c4344081459.exe

Executes dropped EXE 1 IoCs

pid	Process
2296	SearchApp.exe

Adds Run key to start application 2 TTPs 6 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\SearchApp = "\"C:\\Windows\\SystemApps\\Microsoft.Windows.Search_cw5n1h2txyewy\\DefaultSettings\\SearchApp.exe\""	1a23b06a1a5708eb5557d8ba9c15d4c4608875a9d128d358a75f2c4344081459.exe
Set value (str)	\REGISTRY\MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Run\winlogon = "\"C:\\Windows\\System32\\Windows.UI.CredDialogController\\winlogon.exe\""	1a23b06a1a5708eb5557d8ba9c15d4c4608875a9d128d358a75f2c4344081459.exe
Set value (str)	\REGISTRY\MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Run\unsecapp = "\"C:\\Windows\\System32\\wbem\\FunDisc\\unsecapp.exe\""	1a23b06a1a5708eb5557d8ba9c15d4c4608875a9d128d358a75f2c4344081459.exe
Set value (str)	\REGISTRY\MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Run\SppExtComObj = "\"C:\\Recovery\\WindowsRE\\SppExtComObj.exe\""	1a23b06a1a5708eb5557d8ba9c15d4c4608875a9d128d358a75f2c4344081459.exe
Set value (str)	\REGISTRY\MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Run\RuntimeBroker = "\"C:\\Documents and Settings\\RuntimeBroker.exe\""	1a23b06a1a5708eb5557d8ba9c15d4c4608875a9d128d358a75f2c4344081459.exe
Set value (str)	\REGISTRY\MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Run\RuntimeBroker = "\"C:\\Windows\\System32\\sppcomapi\\RuntimeBroker.exe\""	1a23b06a1a5708eb5557d8ba9c15d4c4608875a9d128d358a75f2c4344081459.exe

Drops file in System32 directory 6 IoCs

description	ioc	Process
File created	C:\Windows\System32\Windows.UI.CredDialogController\cc11b995f2a76da408ea6a601e682e64743153ad	1a23b06a1a5708eb5557d8ba9c15d4c4608875a9d128d358a75f2c4344081459.exe
File created	C:\Windows\System32\wbem\FunDisc\unsecapp.exe	1a23b06a1a5708eb5557d8ba9c15d4c4608875a9d128d358a75f2c4344081459.exe
File created	C:\Windows\System32\wbem\FunDisc\29c1c3cc0f76855c7e7456076a4ffc27e4947119	1a23b06a1a5708eb5557d8ba9c15d4c4608875a9d128d358a75f2c4344081459.exe
File created	C:\Windows\System32\sppcomapi\RuntimeBroker.exe	1a23b06a1a5708eb5557d8ba9c15d4c4608875a9d128d358a75f2c4344081459.exe
File created	C:\Windows\System32\sppcomapi\9e8d7a4ca61bd92aff00cc37a7a4d62a2cac998d	1a23b06a1a5708eb5557d8ba9c15d4c4608875a9d128d358a75f2c4344081459.exe
File created	C:\Windows\System32\Windows.UI.CredDialogController\winlogon.exe	1a23b06a1a5708eb5557d8ba9c15d4c4608875a9d128d358a75f2c4344081459.exe

Drops file in Windows directory 2 IoCs

description	ioc	Process
File created	C:\Windows\SystemApps\Microsoft.Windows.Search_cw5n1h2txyewy\DefaultSettings\SearchApp.exe	1a23b06a1a5708eb5557d8ba9c15d4c4608875a9d128d358a75f2c4344081459.exe
File created	C:\Windows\SystemApps\Microsoft.Windows.Search_cw5n1h2txyewy\DefaultSettings\38384e6a620884a6b69bcc56f80d556f9200171c	1a23b06a1a5708eb5557d8ba9c15d4c4608875a9d128d358a75f2c4344081459.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-1-5-21-940901362-3608833189-1915618603-1000_Classes\Local Settings	1a23b06a1a5708eb5557d8ba9c15d4c4608875a9d128d358a75f2c4344081459.exe

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
1752	schtasks.exe
3716	schtasks.exe
5008	schtasks.exe
4120	schtasks.exe
4388	schtasks.exe
4108	schtasks.exe

Suspicious behavior: EnumeratesProcesses 5 IoCs

pid	Process
4948	1a23b06a1a5708eb5557d8ba9c15d4c4608875a9d128d358a75f2c4344081459.exe
4948	1a23b06a1a5708eb5557d8ba9c15d4c4608875a9d128d358a75f2c4344081459.exe
4948	1a23b06a1a5708eb5557d8ba9c15d4c4608875a9d128d358a75f2c4344081459.exe
2296	SearchApp.exe
2296	SearchApp.exe

Suspicious use of AdjustPrivilegeToken 2 IoCs

description	pid	Process
Token: SeDebugPrivilege	4948	1a23b06a1a5708eb5557d8ba9c15d4c4608875a9d128d358a75f2c4344081459.exe
Token: SeDebugPrivilege	2296	SearchApp.exe

Suspicious use of WriteProcessMemory 6 IoCs

description	pid	Process	procid_target
PID 4948 wrote to memory of 1540	4948	1a23b06a1a5708eb5557d8ba9c15d4c4608875a9d128d358a75f2c4344081459.exe	90
PID 4948 wrote to memory of 1540	4948	1a23b06a1a5708eb5557d8ba9c15d4c4608875a9d128d358a75f2c4344081459.exe	90
PID 1540 wrote to memory of 1444	1540	cmd.exe	92
PID 1540 wrote to memory of 1444	1540	cmd.exe	92
PID 1540 wrote to memory of 2296	1540	cmd.exe	99
PID 1540 wrote to memory of 2296	1540	cmd.exe	99

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⤵
- Checks computer location settings
- Adds Run key to start application
- Drops file in System32 directory
- Drops file in Windows directory
- Modifies registry class
- Suspicious behavior: EnumeratesProcesses
- Suspicious use of AdjustPrivilegeToken
- Suspicious use of WriteProcessMemory
PID:4948
- C:\Windows\System32\cmd.exe
  "C:\Windows\System32\cmd.exe" /C "C:\Users\Admin\AppData\Local\Temp\oaFC3HDyu5.bat"
  2⤵
  - Suspicious use of WriteProcessMemory
  PID:1540
- - C:\Windows\system32\w32tm.exe
    w32tm /stripchart /computer:localhost /period:5 /dataonly /samples:2
    3⤵
    PID:1444
- - C:\Windows\SystemApps\Microsoft.Windows.Search_cw5n1h2txyewy\DefaultSettings\SearchApp.exe
    "C:\Windows\SystemApps\Microsoft.Windows.Search_cw5n1h2txyewy\DefaultSettings\SearchApp.exe"
    3⤵
    - Executes dropped EXE
    - Suspicious behavior: EnumeratesProcesses
    - Suspicious use of AdjustPrivilegeToken
    PID:2296

C:\Windows\system32\schtasks.exe
schtasks.exe /create /tn "SppExtComObj" /sc ONLOGON /tr "'C:\Recovery\WindowsRE\SppExtComObj.exe'" /rl HIGHEST /f
1⤵
- Process spawned unexpected child process
- Scheduled Task/Job: Scheduled Task
PID:3716

C:\Windows\system32\schtasks.exe
schtasks.exe /create /tn "RuntimeBroker" /sc ONLOGON /tr "'C:\Documents and Settings\RuntimeBroker.exe'" /rl HIGHEST /f
1⤵
- Process spawned unexpected child process
- Scheduled Task/Job: Scheduled Task
PID:5008

C:\Windows\system32\schtasks.exe
schtasks.exe /create /tn "RuntimeBroker" /sc ONLOGON /tr "'C:\Windows\System32\sppcomapi\RuntimeBroker.exe'" /rl HIGHEST /f
1⤵
- Process spawned unexpected child process
- Scheduled Task/Job: Scheduled Task
PID:4120

C:\Windows\system32\schtasks.exe
schtasks.exe /create /tn "SearchApp" /sc ONLOGON /tr "'C:\Windows\SystemApps\Microsoft.Windows.Search_cw5n1h2txyewy\DefaultSettings\SearchApp.exe'" /rl HIGHEST /f
1⤵
- Process spawned unexpected child process
- Scheduled Task/Job: Scheduled Task
PID:4388

C:\Windows\system32\schtasks.exe
schtasks.exe /create /tn "winlogon" /sc ONLOGON /tr "'C:\Windows\System32\Windows.UI.CredDialogController\winlogon.exe'" /rl HIGHEST /f
1⤵
- Process spawned unexpected child process
- Scheduled Task/Job: Scheduled Task
PID:4108

C:\Windows\system32\schtasks.exe
schtasks.exe /create /tn "unsecapp" /sc ONLOGON /tr "'C:\Windows\System32\wbem\FunDisc\unsecapp.exe'" /rl HIGHEST /f
1⤵
- Process spawned unexpected child process
- Scheduled Task/Job: Scheduled Task
PID:1752

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

2

T1012

System Information Discovery

2

T1082

Lateral Movement

Collection

Command and Control

Exfiltration

Impact

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Downloads

C:\Users\Admin\AppData\Local\Temp\oaFC3HDyu5.bat

Filesize
254B

MD5
c5af7266bcf744573306b429aa92a8b9

SHA1
069f0b2d26d02a967d6650c3140560c5dd81ed7b

SHA256
db5317fa6f14fb94954edd578d879c9204e1cc4c09c92290a89f75c71d6d9789

SHA512
959fd0fb409e291b91c7469664c06adc1e94686ec0903ce2f241e2baab430f3b55edded702a74518946f63825a075d3fb1b847947a7f146a7e7bf95593ee5905

Download Submit
C:\Windows\System32\Windows.UI.CredDialogController\winlogon.exe

Filesize
2.1MB

MD5
96affeab8e13743e57269977f1805472

SHA1
8935028d2abde57185acd3e1f59d831cc6ac5bc0

SHA256
1a23b06a1a5708eb5557d8ba9c15d4c4608875a9d128d358a75f2c4344081459

SHA512
a8a1c5c302f6d51a7d390bf47ee0b4e2513498fec1081ffd2ec819133149c59c6b6bac7f6c8e7d7bd0e557c4f77f2789324cae8ccda90e1d60b3906b5d448fea

Download Submit
memory/2296-31-0x00000000011A0000-0x00000000011A8000-memory.dmp

Filesize
32KB

Download
memory/2296-27-0x0000000000FD0000-0x0000000000FD8000-memory.dmp

Filesize
32KB

Download
memory/2296-36-0x00000000011E0000-0x00000000011EA000-memory.dmp

Filesize
40KB

Download
memory/2296-34-0x0000000001200000-0x0000000001208000-memory.dmp

Filesize
32KB

Download
memory/2296-25-0x0000000000FB0000-0x0000000000FBC000-memory.dmp

Filesize
48KB

Download
memory/2296-26-0x0000000000FC0000-0x0000000000FC8000-memory.dmp

Filesize
32KB

Download
memory/2296-28-0x0000000001010000-0x000000000101E000-memory.dmp

Filesize
56KB

Download
memory/2296-35-0x00000000011D0000-0x00000000011D8000-memory.dmp

Filesize
32KB

Download
memory/2296-29-0x0000000001020000-0x0000000001076000-memory.dmp

Filesize
344KB

Download
memory/2296-30-0x0000000001180000-0x000000000118A000-memory.dmp

Filesize
40KB

Download
memory/2296-33-0x00000000011C0000-0x00000000011C8000-memory.dmp

Filesize
32KB

Download
memory/2296-32-0x00000000011B0000-0x00000000011BC000-memory.dmp

Filesize
48KB

Download
memory/4948-0-0x00007FF99D843000-0x00007FF99D845000-memory.dmp

Filesize
8KB

Download
memory/4948-4-0x00007FF99D840000-0x00007FF99E301000-memory.dmp

Filesize
10.8MB

Download
memory/4948-1-0x0000000000880000-0x0000000000AAC000-memory.dmp

Filesize
2.2MB

Download
memory/4948-20-0x00007FF99D840000-0x00007FF99E301000-memory.dmp

Filesize
10.8MB

Download

Analysis

Sharing

General

Malware Config

Signatures

Processes

Network

MITRE ATT&CK Enterprise v15

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Downloads