dcrat | eda07f0921abe44f67eff44b1cfb5cfdb13529dc48243a01962c0ad5129d35f1

Analysis

max time kernel
93s
max time network
94s
platform
windows10-2004_x64
resource
win10v2004-20241007-en
resource tags

arch:x64arch:x86image:win10v2004-20241007-enlocale:en-usos:windows10-2004-x64system
submitted
22-11-2024 07:28

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General

Target

eda07f0921abe44f67eff44b1cfb5cfdb13529dc48243a01962c0ad5129d35f1.exe
Size

1.3MB
MD5

85557604dc44ef6128cf359f9516a773
SHA1

ccc47c852610d56888b86a89fb2efbd881348f73
SHA256

eda07f0921abe44f67eff44b1cfb5cfdb13529dc48243a01962c0ad5129d35f1
SHA512

4a868472b6d325557ce4556b019dfde667956d64bc91f312af2e6a9ae1fa6640afd7e6ee5c4a1ef26e7356e704c5395eddeee372b250ac1973bd613b8c38346c
SSDEEP

24576:U2G/nvxW3Ww0t5N7MCHS/+tqnmJZqmsIma/59qihru6Lc+4Z:UbA30jMAl74mHWiBbc

Score

10^/10

dcrat discovery infostealer persistence rat

Malware Config

Signatures

DcRat 7 IoCs

DarkCrystal(DC) is a new .NET RAT active since June 2019 capable of loading additional plugins.

rat infostealer dcrat

description	ioc	pid	Process
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language		eda07f0921abe44f67eff44b1cfb5cfdb13529dc48243a01962c0ad5129d35f1.exe
		1356	schtasks.exe
		2236	schtasks.exe
		3308	schtasks.exe
		1836	schtasks.exe
		4060	schtasks.exe
		4208	schtasks.exe

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	1356	2268	schtasks.exe	89
Parent C:\Windows\system32\wbem\wmiprvse.exe is not expected to spawn this process	2236	2268	schtasks.exe	89
Parent C:\Windows\system32\wbem\wmiprvse.exe is not expected to spawn this process	3308	2268	schtasks.exe	89
Parent C:\Windows\system32\wbem\wmiprvse.exe is not expected to spawn this process	1836	2268	schtasks.exe	89
Parent C:\Windows\system32\wbem\wmiprvse.exe is not expected to spawn this process	4060	2268	schtasks.exe	89
Parent C:\Windows\system32\wbem\wmiprvse.exe is not expected to spawn this process	4208	2268	schtasks.exe	89

DCRat payload 2 IoCs

Detects payload of DCRat, commonly dropped by NSIS installers.

rat

resource	yara_rule
behavioral2/files/0x000a000000023b69-10.dat	dcrat
behavioral2/memory/4216-13-0x0000000000510000-0x000000000061C000-memory.dmp	dcrat

Checks computer location settings 2 TTPs 3 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-1-5-21-3227495264-2217614367-4027411560-1000\Control Panel\International\Geo\Nation	eda07f0921abe44f67eff44b1cfb5cfdb13529dc48243a01962c0ad5129d35f1.exe
Key value queried	\REGISTRY\USER\S-1-5-21-3227495264-2217614367-4027411560-1000\Control Panel\International\Geo\Nation	WScript.exe
Key value queried	\REGISTRY\USER\S-1-5-21-3227495264-2217614367-4027411560-1000\Control Panel\International\Geo\Nation	fontreviewwinsvcrefPerfdll.exe

Executes dropped EXE 2 IoCs

pid	Process
4216	fontreviewwinsvcrefPerfdll.exe
3652	conhost.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\RuntimeBroker = "\"C:\\Windows\\System32\\netman\\RuntimeBroker.exe\""	fontreviewwinsvcrefPerfdll.exe
Set value (str)	\REGISTRY\MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Run\dllhost = "\"C:\\Windows\\System32\\dafBth\\dllhost.exe\""	fontreviewwinsvcrefPerfdll.exe
Set value (str)	\REGISTRY\MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Run\dllhost = "\"C:\\Windows\\System32\\TtlsCfg\\dllhost.exe\""	fontreviewwinsvcrefPerfdll.exe
Set value (str)	\REGISTRY\MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Run\conhost = "\"C:\\Windows\\System32\\shutdownext\\conhost.exe\""	fontreviewwinsvcrefPerfdll.exe
Set value (str)	\REGISTRY\MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Run\SppExtComObj = "\"C:\\PerfLogs\\SppExtComObj.exe\""	fontreviewwinsvcrefPerfdll.exe
Set value (str)	\REGISTRY\MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Run\OfficeClickToRun = "\"C:\\Program Files\\Common Files\\microsoft shared\\ClickToRun\\C2RINTL.pt-br\\OfficeClickToRun.exe\""	fontreviewwinsvcrefPerfdll.exe

Drops file in System32 directory 9 IoCs

description	ioc	Process
File created	C:\Windows\System32\dafBth\dllhost.exe	fontreviewwinsvcrefPerfdll.exe
File created	C:\Windows\System32\dafBth\5940a34987c99120d96dace90a3f93f329dcad63	fontreviewwinsvcrefPerfdll.exe
File created	C:\Windows\System32\TtlsCfg\dllhost.exe	fontreviewwinsvcrefPerfdll.exe
File created	C:\Windows\System32\netman\RuntimeBroker.exe	fontreviewwinsvcrefPerfdll.exe
File opened for modification	C:\Windows\System32\netman\RuntimeBroker.exe	fontreviewwinsvcrefPerfdll.exe
File created	C:\Windows\System32\netman\9e8d7a4ca61bd92aff00cc37a7a4d62a2cac998d	fontreviewwinsvcrefPerfdll.exe
File created	C:\Windows\System32\TtlsCfg\5940a34987c99120d96dace90a3f93f329dcad63	fontreviewwinsvcrefPerfdll.exe
File created	C:\Windows\System32\shutdownext\conhost.exe	fontreviewwinsvcrefPerfdll.exe
File created	C:\Windows\System32\shutdownext\088424020bedd6b28ac7fd22ee35dcd7322895ce	fontreviewwinsvcrefPerfdll.exe

Drops file in Program Files directory 2 IoCs

description	ioc	Process
File created	C:\Program Files\Common Files\microsoft shared\ClickToRun\C2RINTL.pt-br\OfficeClickToRun.exe	fontreviewwinsvcrefPerfdll.exe
File created	C:\Program Files\Common Files\microsoft shared\ClickToRun\C2RINTL.pt-br\e6c9b481da804f07baff8eff543b0a1441069b5d	fontreviewwinsvcrefPerfdll.exe

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

System Information Discovery
T1082

System Location Discovery: System Language Discovery 1 TTPs 3 IoCs

Attempt gather information about the system language of a victim in order to infer the geographical location of that host.

discovery

System Language Discovery

T1614.001

description	ioc	Process
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	eda07f0921abe44f67eff44b1cfb5cfdb13529dc48243a01962c0ad5129d35f1.exe
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	WScript.exe
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	cmd.exe

Modifies registry class 1 IoCs

description	ioc	Process
Key created	\REGISTRY\USER\S-1-5-21-3227495264-2217614367-4027411560-1000_Classes\Local Settings	eda07f0921abe44f67eff44b1cfb5cfdb13529dc48243a01962c0ad5129d35f1.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
1356	schtasks.exe
2236	schtasks.exe
3308	schtasks.exe
1836	schtasks.exe
4060	schtasks.exe
4208	schtasks.exe

Suspicious behavior: EnumeratesProcesses 64 IoCs

pid	Process
4216	fontreviewwinsvcrefPerfdll.exe
4216	fontreviewwinsvcrefPerfdll.exe
4216	fontreviewwinsvcrefPerfdll.exe
3652	conhost.exe
3652	conhost.exe
3652	conhost.exe
3652	conhost.exe
3652	conhost.exe
3652	conhost.exe
3652	conhost.exe
3652	conhost.exe
3652	conhost.exe
3652	conhost.exe
3652	conhost.exe
3652	conhost.exe
3652	conhost.exe
3652	conhost.exe
3652	conhost.exe
3652	conhost.exe
3652	conhost.exe
3652	conhost.exe
3652	conhost.exe
3652	conhost.exe
3652	conhost.exe
3652	conhost.exe
3652	conhost.exe
3652	conhost.exe
3652	conhost.exe
3652	conhost.exe
3652	conhost.exe
3652	conhost.exe
3652	conhost.exe
3652	conhost.exe
3652	conhost.exe
3652	conhost.exe
3652	conhost.exe
3652	conhost.exe
3652	conhost.exe
3652	conhost.exe
3652	conhost.exe
3652	conhost.exe
3652	conhost.exe
3652	conhost.exe
3652	conhost.exe
3652	conhost.exe
3652	conhost.exe
3652	conhost.exe
3652	conhost.exe
3652	conhost.exe
3652	conhost.exe
3652	conhost.exe
3652	conhost.exe
3652	conhost.exe
3652	conhost.exe
3652	conhost.exe
3652	conhost.exe
3652	conhost.exe
3652	conhost.exe
3652	conhost.exe
3652	conhost.exe
3652	conhost.exe
3652	conhost.exe
3652	conhost.exe
3652	conhost.exe

Suspicious use of AdjustPrivilegeToken 2 IoCs

description	pid	Process
Token: SeDebugPrivilege	4216	fontreviewwinsvcrefPerfdll.exe
Token: SeDebugPrivilege	3652	conhost.exe

Suspicious use of WriteProcessMemory 10 IoCs

description	pid	Process	procid_target
PID 1140 wrote to memory of 2680	1140	eda07f0921abe44f67eff44b1cfb5cfdb13529dc48243a01962c0ad5129d35f1.exe	82
PID 1140 wrote to memory of 2680	1140	eda07f0921abe44f67eff44b1cfb5cfdb13529dc48243a01962c0ad5129d35f1.exe	82
PID 1140 wrote to memory of 2680	1140	eda07f0921abe44f67eff44b1cfb5cfdb13529dc48243a01962c0ad5129d35f1.exe	82
PID 2680 wrote to memory of 1116	2680	WScript.exe	85
PID 2680 wrote to memory of 1116	2680	WScript.exe	85
PID 2680 wrote to memory of 1116	2680	WScript.exe	85
PID 1116 wrote to memory of 4216	1116	cmd.exe	87
PID 1116 wrote to memory of 4216	1116	cmd.exe	87
PID 4216 wrote to memory of 3652	4216	fontreviewwinsvcrefPerfdll.exe	96
PID 4216 wrote to memory of 3652	4216	fontreviewwinsvcrefPerfdll.exe	96

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\eda07f0921abe44f67eff44b1cfb5cfdb13529dc48243a01962c0ad5129d35f1.exe
"C:\Users\Admin\AppData\Local\Temp\eda07f0921abe44f67eff44b1cfb5cfdb13529dc48243a01962c0ad5129d35f1.exe"
1⤵
- DcRat
- Checks computer location settings
- System Location Discovery: System Language Discovery
- Modifies registry class
- Suspicious use of WriteProcessMemory
PID:1140
- C:\Windows\SysWOW64\WScript.exe
  "C:\Windows\System32\WScript.exe" "C:\fontreviewwinsvc\HZSUF0ENoqATgs2xuBB5SnvQ30qsZ.vbe"
  2⤵
  - Checks computer location settings
  - System Location Discovery: System Language Discovery
  - Suspicious use of WriteProcessMemory
  PID:2680
- - C:\Windows\SysWOW64\cmd.exe
    C:\Windows\system32\cmd.exe /c ""C:\fontreviewwinsvc\JAvevGsJOHZ7p.bat" "
    3⤵
    - System Location Discovery: System Language Discovery
    - Suspicious use of WriteProcessMemory
    PID:1116
  - - C:\fontreviewwinsvc\fontreviewwinsvcrefPerfdll.exe
      "C:\fontreviewwinsvc\fontreviewwinsvcrefPerfdll.exe"
      4⤵
      Checks computer location settings
      Executes dropped EXE
      Adds Run key to start application
      Drops file in System32 directory
      Drops file in Program Files directory
      Suspicious behavior: EnumeratesProcesses
      Suspicious use of AdjustPrivilegeToken
      Suspicious use of WriteProcessMemory
      PID:4216
    - - C:\Windows\System32\shutdownext\conhost.exe
        
        "C:\Windows\System32\shutdownext\conhost.exe"
        5⤵
        Executes dropped EXE
        Suspicious behavior: EnumeratesProcesses
        Suspicious use of AdjustPrivilegeToken
        
        PID:3652

C:\Windows\system32\schtasks.exe
schtasks.exe /create /tn "RuntimeBroker" /sc ONLOGON /tr "'C:\Windows\System32\netman\RuntimeBroker.exe'" /rl HIGHEST /f
1⤵
- DcRat
- Process spawned unexpected child process
- Scheduled Task/Job: Scheduled Task
PID:1356

C:\Windows\system32\schtasks.exe
schtasks.exe /create /tn "dllhost" /sc ONLOGON /tr "'C:\Windows\System32\dafBth\dllhost.exe'" /rl HIGHEST /f
1⤵
- DcRat
- Process spawned unexpected child process
- Scheduled Task/Job: Scheduled Task
PID:2236

C:\Windows\system32\schtasks.exe
schtasks.exe /create /tn "dllhost" /sc ONLOGON /tr "'C:\Windows\System32\TtlsCfg\dllhost.exe'" /rl HIGHEST /f
1⤵
- DcRat
- Process spawned unexpected child process
- Scheduled Task/Job: Scheduled Task
PID:3308

C:\Windows\system32\schtasks.exe
schtasks.exe /create /tn "conhost" /sc ONLOGON /tr "'C:\Windows\System32\shutdownext\conhost.exe'" /rl HIGHEST /f
1⤵
- DcRat
- Process spawned unexpected child process
- Scheduled Task/Job: Scheduled Task
PID:1836

C:\Windows\system32\schtasks.exe
schtasks.exe /create /tn "SppExtComObj" /sc ONLOGON /tr "'C:\PerfLogs\SppExtComObj.exe'" /rl HIGHEST /f
1⤵
- DcRat
- Process spawned unexpected child process
- Scheduled Task/Job: Scheduled Task
PID:4060

C:\Windows\system32\schtasks.exe
schtasks.exe /create /tn "OfficeClickToRun" /sc ONLOGON /tr "'C:\Program Files\Common Files\microsoft shared\ClickToRun\C2RINTL.pt-br\OfficeClickToRun.exe'" /rl HIGHEST /f
1⤵
- DcRat
- Process spawned unexpected child process
- Scheduled Task/Job: Scheduled Task
PID:4208

Network

MITRE ATT&CK Enterprise v15

Reconnaissance

Resource Development

Initial Access

Execution

Scheduled Task/Job

T1053

Scheduled Task

T1053.005

Persistence

Boot or Logon Autostart Execution

T1547

Registry Run Keys / Startup Folder

T1547.001

Scheduled Task/Job

T1053

Scheduled Task

T1053.005

Privilege Escalation

Boot or Logon Autostart Execution

T1547

Registry Run Keys / Startup Folder

T1547.001

Scheduled Task/Job

T1053

Scheduled Task

T1053.005

Defense Evasion

Modify Registry

T1112

Credential Access

Discovery

Query Registry

T1012

System Information Discovery

T1082

System Location Discovery

T1614

System Language Discovery

T1614.001

Lateral Movement

Collection

Command and Control

Exfiltration

Impact

Replay Monitor

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Downloads

C:\fontreviewwinsvc\HZSUF0ENoqATgs2xuBB5SnvQ30qsZ.vbe

Filesize
206B

MD5
6516a4960a6cd91391f10cdd67452a43

SHA1
49df369838b52c8f393602685e3598474b0c8894

SHA256
e4eaa44532ad70a2f8f8f92b474a262a8f30eadbe46e9afcbc960be15dc32c53

SHA512
c3ccef7b360c776486e9d9173adef25a9022ad046f52dcbbe4ec56986d989e8bd5a1c0ff64cd68bd48065557cb505139a221d924c004086f2f821fb683147271

Download Submit
C:\fontreviewwinsvc\JAvevGsJOHZ7p.bat

Filesize
52B

MD5
22db99b6cb738df9778a2cbaea5c8d65

SHA1
317794f9120a203cef9d4a54c8b03a945a3e285b

SHA256
4af63f08cbfb0666776f281d9bc73c766d911580061048e59ea6ea7093d65f88

SHA512
8ab77efc664b9617e11dd707beea570960395a08b721bd2f81d9bfc3740e72b0ced58da3e5b870ca550435f3aec2df4e144a27d1fb9f001a41ec51f66a5afec9

Download Submit
C:\fontreviewwinsvc\fontreviewwinsvcrefPerfdll.exe

Filesize
1.0MB

MD5
193a3f45ff80ed77a5c041e5f1f1beb7

SHA1
7ff88a38ee281b02b7f5279d2cd801e647becd73

SHA256
03c5a982b0c3cd3144eaaff24b52a6480f4dc0680f0a006cf59f20565e7497ce

SHA512
20f067f2f552cd19f71519e86fc2b1f2dc7c31a7aa8c22400cba7a7a985b3c61ce659d1bfbf3762bb90ff451f8678d7c7d3a1c26f3280a9d7289c0fb8aa6218b

Download Submit
memory/3652-37-0x0000000001040000-0x000000000104C000-memory.dmp

Filesize
48KB

Download
memory/3652-38-0x0000000001060000-0x000000000106E000-memory.dmp

Filesize
56KB

Download
memory/3652-39-0x0000000001050000-0x0000000001058000-memory.dmp

Filesize
32KB

Download
memory/3652-40-0x0000000002A30000-0x0000000002A38000-memory.dmp

Filesize
32KB

Download
memory/4216-12-0x00007FFDF1723000-0x00007FFDF1725000-memory.dmp

Filesize
8KB

Download
memory/4216-13-0x0000000000510000-0x000000000061C000-memory.dmp

Filesize
1.0MB

Download