dcrat | 65fa57c7a8ac3956292be0a17e56f35fff14fb060cd6022889665901a6ecda5c

General

Target

65fa57c7a8ac3956292be0a17e56f35fff14fb060cd6022889665901a6ecda5c.exe
Size

1.4MB
MD5

4ad4cc9b5b82fc59756523b5b49da103
SHA1

239321573ab48845b649af41908eecadd972dc04
SHA256

65fa57c7a8ac3956292be0a17e56f35fff14fb060cd6022889665901a6ecda5c
SHA512

96c8164723c4ada3ab78a63a94e8b35ed41bebdbdf1591f452453a0209f264120572e1c11e60962ca8b1e2fd96f686f1627eab94d0fbeb86e1c931d803a0ca4b
SSDEEP

24576:U2G/nvxW3Ww0teOtQEIQ/E8pi63hn89pN3bfqaeTBHLChWFBAtlIBGIP5M:UbA30cn8Y6d89f3e5LhFSnIBhG

Score

10^/10

dcrat discovery 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 24 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	2640	2916	schtasks.exe	35
Parent C:\Windows\system32\wbem\wmiprvse.exe is not expected to spawn this process	2920	2916	schtasks.exe	35
Parent C:\Windows\system32\wbem\wmiprvse.exe is not expected to spawn this process	1644	2916	schtasks.exe	35
Parent C:\Windows\system32\wbem\wmiprvse.exe is not expected to spawn this process	2644	2916	schtasks.exe	35
Parent C:\Windows\system32\wbem\wmiprvse.exe is not expected to spawn this process	2432	2916	schtasks.exe	35
Parent C:\Windows\system32\wbem\wmiprvse.exe is not expected to spawn this process	2324	2916	schtasks.exe	35
Parent C:\Windows\system32\wbem\wmiprvse.exe is not expected to spawn this process	2656	2916	schtasks.exe	35
Parent C:\Windows\system32\wbem\wmiprvse.exe is not expected to spawn this process	1084	2916	schtasks.exe	35
Parent C:\Windows\system32\wbem\wmiprvse.exe is not expected to spawn this process	580	2916	schtasks.exe	35
Parent C:\Windows\system32\wbem\wmiprvse.exe is not expected to spawn this process	2816	2916	schtasks.exe	35
Parent C:\Windows\system32\wbem\wmiprvse.exe is not expected to spawn this process	780	2916	schtasks.exe	35
Parent C:\Windows\system32\wbem\wmiprvse.exe is not expected to spawn this process	936	2916	schtasks.exe	35
Parent C:\Windows\system32\wbem\wmiprvse.exe is not expected to spawn this process	2836	2916	schtasks.exe	35
Parent C:\Windows\system32\wbem\wmiprvse.exe is not expected to spawn this process	1652	2916	schtasks.exe	35
Parent C:\Windows\system32\wbem\wmiprvse.exe is not expected to spawn this process	532	2916	schtasks.exe	35
Parent C:\Windows\system32\wbem\wmiprvse.exe is not expected to spawn this process	2364	2916	schtasks.exe	35
Parent C:\Windows\system32\wbem\wmiprvse.exe is not expected to spawn this process	1856	2916	schtasks.exe	35
Parent C:\Windows\system32\wbem\wmiprvse.exe is not expected to spawn this process	1264	2916	schtasks.exe	35
Parent C:\Windows\system32\wbem\wmiprvse.exe is not expected to spawn this process	296	2916	schtasks.exe	35
Parent C:\Windows\system32\wbem\wmiprvse.exe is not expected to spawn this process	2476	2916	schtasks.exe	35
Parent C:\Windows\system32\wbem\wmiprvse.exe is not expected to spawn this process	2976	2916	schtasks.exe	35
Parent C:\Windows\system32\wbem\wmiprvse.exe is not expected to spawn this process	1720	2916	schtasks.exe	35
Parent C:\Windows\system32\wbem\wmiprvse.exe is not expected to spawn this process	1640	2916	schtasks.exe	35
Parent C:\Windows\system32\wbem\wmiprvse.exe is not expected to spawn this process	2392	2916	schtasks.exe	35

DCRat payload 3 IoCs

Detects payload of DCRat, commonly dropped by NSIS installers.

rat

resource	yara_rule
behavioral1/files/0x0008000000016210-9.dat	dcrat
behavioral1/memory/2352-13-0x0000000000120000-0x0000000000244000-memory.dmp	dcrat
behavioral1/memory/2072-39-0x0000000000D40000-0x0000000000E64000-memory.dmp	dcrat

Executes dropped EXE 2 IoCs

pid	Process
2352	bridgereviewwin.exe
2072	spoolsv.exe

Loads dropped DLL 2 IoCs

pid	Process
2988	cmd.exe
2988	cmd.exe

Drops file in Program Files directory 8 IoCs

description	ioc	Process
File created	C:\Program Files\7-Zip\Lang\56085415360792	bridgereviewwin.exe
File created	C:\Program Files\VideoLAN\VLC\lua\playlist\audiodg.exe	bridgereviewwin.exe
File created	C:\Program Files\VideoLAN\VLC\lua\playlist\42af1c969fbb7b	bridgereviewwin.exe
File created	C:\Program Files (x86)\Windows Defender\en-US\dllhost.exe	bridgereviewwin.exe
File created	C:\Program Files (x86)\Windows Defender\en-US\5940a34987c991	bridgereviewwin.exe
File created	C:\Program Files\Windows Photo Viewer\es-ES\WmiPrvSE.exe	bridgereviewwin.exe
File created	C:\Program Files\Windows Photo Viewer\es-ES\24dbde2999530e	bridgereviewwin.exe
File created	C:\Program Files\7-Zip\Lang\wininit.exe	bridgereviewwin.exe

Drops file in Windows directory 2 IoCs

description	ioc	Process
File created	C:\Windows\fr-FR\dllhost.exe	bridgereviewwin.exe
File created	C:\Windows\fr-FR\5940a34987c991	bridgereviewwin.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	cmd.exe
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	65fa57c7a8ac3956292be0a17e56f35fff14fb060cd6022889665901a6ecda5c.exe
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	WScript.exe

Scheduled Task/Job: Scheduled Task 1 TTPs 24 IoCs

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

persistence execution

Scheduled Task

T1053.005

pid	Process
2640	schtasks.exe
2644	schtasks.exe
780	schtasks.exe
1856	schtasks.exe
1264	schtasks.exe
2976	schtasks.exe
2392	schtasks.exe
2920	schtasks.exe
2324	schtasks.exe
2816	schtasks.exe
936	schtasks.exe
2836	schtasks.exe
532	schtasks.exe
1640	schtasks.exe
2432	schtasks.exe
1084	schtasks.exe
580	schtasks.exe
1652	schtasks.exe
2364	schtasks.exe
296	schtasks.exe
1644	schtasks.exe
2656	schtasks.exe
2476	schtasks.exe
1720	schtasks.exe

Suspicious behavior: EnumeratesProcesses 10 IoCs

pid	Process
2352	bridgereviewwin.exe
2072	spoolsv.exe
2072	spoolsv.exe
2072	spoolsv.exe
2072	spoolsv.exe
2072	spoolsv.exe
2072	spoolsv.exe
2072	spoolsv.exe
2072	spoolsv.exe
2072	spoolsv.exe

Suspicious use of AdjustPrivilegeToken 2 IoCs

description	pid	Process
Token: SeDebugPrivilege	2352	bridgereviewwin.exe
Token: SeDebugPrivilege	2072	spoolsv.exe

Suspicious use of WriteProcessMemory 21 IoCs

description	pid	Process	procid_target
PID 2128 wrote to memory of 3048	2128	65fa57c7a8ac3956292be0a17e56f35fff14fb060cd6022889665901a6ecda5c.exe	30
PID 2128 wrote to memory of 3048	2128	65fa57c7a8ac3956292be0a17e56f35fff14fb060cd6022889665901a6ecda5c.exe	30
PID 2128 wrote to memory of 3048	2128	65fa57c7a8ac3956292be0a17e56f35fff14fb060cd6022889665901a6ecda5c.exe	30
PID 2128 wrote to memory of 3048	2128	65fa57c7a8ac3956292be0a17e56f35fff14fb060cd6022889665901a6ecda5c.exe	30
PID 3048 wrote to memory of 2988	3048	WScript.exe	31
PID 3048 wrote to memory of 2988	3048	WScript.exe	31
PID 3048 wrote to memory of 2988	3048	WScript.exe	31
PID 3048 wrote to memory of 2988	3048	WScript.exe	31
PID 2988 wrote to memory of 2352	2988	cmd.exe	33
PID 2988 wrote to memory of 2352	2988	cmd.exe	33
PID 2988 wrote to memory of 2352	2988	cmd.exe	33
PID 2988 wrote to memory of 2352	2988	cmd.exe	33
PID 2352 wrote to memory of 2404	2352	bridgereviewwin.exe	60
PID 2352 wrote to memory of 2404	2352	bridgereviewwin.exe	60
PID 2352 wrote to memory of 2404	2352	bridgereviewwin.exe	60
PID 2404 wrote to memory of 1632	2404	cmd.exe	62
PID 2404 wrote to memory of 1632	2404	cmd.exe	62
PID 2404 wrote to memory of 1632	2404	cmd.exe	62
PID 2404 wrote to memory of 2072	2404	cmd.exe	63
PID 2404 wrote to memory of 2072	2404	cmd.exe	63
PID 2404 wrote to memory of 2072	2404	cmd.exe	63

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\65fa57c7a8ac3956292be0a17e56f35fff14fb060cd6022889665901a6ecda5c.exe
"C:\Users\Admin\AppData\Local\Temp\65fa57c7a8ac3956292be0a17e56f35fff14fb060cd6022889665901a6ecda5c.exe"
1⤵
- System Location Discovery: System Language Discovery
- Suspicious use of WriteProcessMemory
PID:2128
- C:\Windows\SysWOW64\WScript.exe
  "C:\Windows\System32\WScript.exe" "C:\providerbrowserWebFont\YIgtMaExFJFBncNn1em9wJcGNWr3f.vbe"
  2⤵
  - System Location Discovery: System Language Discovery
  - Suspicious use of WriteProcessMemory
  PID:3048
- - C:\Windows\SysWOW64\cmd.exe
    cmd /c ""C:\providerbrowserWebFont\5cmX3eeCizBMduOP4xHF1p.bat" "
    3⤵
    - Loads dropped DLL
    - System Location Discovery: System Language Discovery
    - Suspicious use of WriteProcessMemory
    PID:2988
  - - C:\providerbrowserWebFont\bridgereviewwin.exe
      "C:\providerbrowserWebFont\bridgereviewwin.exe"
      4⤵
      Executes dropped EXE
      Drops file in Program Files directory
      Drops file in Windows directory
      Suspicious behavior: EnumeratesProcesses
      Suspicious use of AdjustPrivilegeToken
      Suspicious use of WriteProcessMemory
      PID:2352
    - - C:\Windows\System32\cmd.exe
        
        "C:\Windows\System32\cmd.exe" /C "C:\Users\Admin\AppData\Local\Temp\Q9v2X4ctCI.bat"
        5⤵
        Suspicious use of WriteProcessMemory
        
        PID:2404
      - C:\Windows\system32\w32tm.exe
        
        w32tm /stripchart /computer:localhost /period:5 /dataonly /samples:2
        6⤵
        
        PID:1632
      - C:\Recovery\1f5748e2-69f6-11ef-b486-62cb582c238c\spoolsv.exe
        
        "C:\Recovery\1f5748e2-69f6-11ef-b486-62cb582c238c\spoolsv.exe"
        6⤵
        Executes dropped EXE
        Suspicious behavior: EnumeratesProcesses
        Suspicious use of AdjustPrivilegeToken
        
        PID:2072

C:\Windows\system32\schtasks.exe
schtasks.exe /create /tn "winlogonw" /sc MINUTE /mo 10 /tr "'C:\providerbrowserWebFont\winlogon.exe'" /f
1⤵
- Process spawned unexpected child process
- Scheduled Task/Job: Scheduled Task
PID:2640

C:\Windows\system32\schtasks.exe
schtasks.exe /create /tn "winlogon" /sc ONLOGON /tr "'C:\providerbrowserWebFont\winlogon.exe'" /rl HIGHEST /f
1⤵
- Process spawned unexpected child process
- Scheduled Task/Job: Scheduled Task
PID:2920

C:\Windows\system32\schtasks.exe
schtasks.exe /create /tn "winlogonw" /sc MINUTE /mo 5 /tr "'C:\providerbrowserWebFont\winlogon.exe'" /rl HIGHEST /f
1⤵
- Process spawned unexpected child process
- Scheduled Task/Job: Scheduled Task
PID:1644

C:\Windows\system32\schtasks.exe
schtasks.exe /create /tn "dllhostd" /sc MINUTE /mo 13 /tr "'C:\Windows\fr-FR\dllhost.exe'" /f
1⤵
- Process spawned unexpected child process
- Scheduled Task/Job: Scheduled Task
PID:2644

C:\Windows\system32\schtasks.exe
schtasks.exe /create /tn "dllhost" /sc ONLOGON /tr "'C:\Windows\fr-FR\dllhost.exe'" /rl HIGHEST /f
1⤵
- Process spawned unexpected child process
- Scheduled Task/Job: Scheduled Task
PID:2432

C:\Windows\system32\schtasks.exe
schtasks.exe /create /tn "dllhostd" /sc MINUTE /mo 10 /tr "'C:\Windows\fr-FR\dllhost.exe'" /rl HIGHEST /f
1⤵
- Process spawned unexpected child process
- Scheduled Task/Job: Scheduled Task
PID:2324

C:\Windows\system32\schtasks.exe
schtasks.exe /create /tn "audiodga" /sc MINUTE /mo 8 /tr "'C:\Program Files\VideoLAN\VLC\lua\playlist\audiodg.exe'" /f
1⤵
- Process spawned unexpected child process
- Scheduled Task/Job: Scheduled Task
PID:2656

C:\Windows\system32\schtasks.exe
schtasks.exe /create /tn "audiodg" /sc ONLOGON /tr "'C:\Program Files\VideoLAN\VLC\lua\playlist\audiodg.exe'" /rl HIGHEST /f
1⤵
- Process spawned unexpected child process
- Scheduled Task/Job: Scheduled Task
PID:1084

C:\Windows\system32\schtasks.exe
schtasks.exe /create /tn "audiodga" /sc MINUTE /mo 7 /tr "'C:\Program Files\VideoLAN\VLC\lua\playlist\audiodg.exe'" /rl HIGHEST /f
1⤵
- Process spawned unexpected child process
- Scheduled Task/Job: Scheduled Task
PID:580

C:\Windows\system32\schtasks.exe
schtasks.exe /create /tn "dllhostd" /sc MINUTE /mo 12 /tr "'C:\Program Files (x86)\Windows Defender\en-US\dllhost.exe'" /f
1⤵
- Process spawned unexpected child process
- Scheduled Task/Job: Scheduled Task
PID:2816

C:\Windows\system32\schtasks.exe
schtasks.exe /create /tn "dllhost" /sc ONLOGON /tr "'C:\Program Files (x86)\Windows Defender\en-US\dllhost.exe'" /rl HIGHEST /f
1⤵
- Process spawned unexpected child process
- Scheduled Task/Job: Scheduled Task
PID:780

C:\Windows\system32\schtasks.exe
schtasks.exe /create /tn "dllhostd" /sc MINUTE /mo 12 /tr "'C:\Program Files (x86)\Windows Defender\en-US\dllhost.exe'" /rl HIGHEST /f
1⤵
- Process spawned unexpected child process
- Scheduled Task/Job: Scheduled Task
PID:936

C:\Windows\system32\schtasks.exe
schtasks.exe /create /tn "dwmd" /sc MINUTE /mo 12 /tr "'C:\MSOCache\All Users\{90140000-001B-0409-0000-0000000FF1CE}-C\dwm.exe'" /f
1⤵
- Process spawned unexpected child process
- Scheduled Task/Job: Scheduled Task
PID:2836

C:\Windows\system32\schtasks.exe
schtasks.exe /create /tn "dwm" /sc ONLOGON /tr "'C:\MSOCache\All Users\{90140000-001B-0409-0000-0000000FF1CE}-C\dwm.exe'" /rl HIGHEST /f
1⤵
- Process spawned unexpected child process
- Scheduled Task/Job: Scheduled Task
PID:1652

C:\Windows\system32\schtasks.exe
schtasks.exe /create /tn "dwmd" /sc MINUTE /mo 6 /tr "'C:\MSOCache\All Users\{90140000-001B-0409-0000-0000000FF1CE}-C\dwm.exe'" /rl HIGHEST /f
1⤵
- Process spawned unexpected child process
- Scheduled Task/Job: Scheduled Task
PID:532

C:\Windows\system32\schtasks.exe
schtasks.exe /create /tn "spoolsvs" /sc MINUTE /mo 5 /tr "'C:\Recovery\1f5748e2-69f6-11ef-b486-62cb582c238c\spoolsv.exe'" /f
1⤵
- Process spawned unexpected child process
- Scheduled Task/Job: Scheduled Task
PID:2364

C:\Windows\system32\schtasks.exe
schtasks.exe /create /tn "spoolsv" /sc ONLOGON /tr "'C:\Recovery\1f5748e2-69f6-11ef-b486-62cb582c238c\spoolsv.exe'" /rl HIGHEST /f
1⤵
- Process spawned unexpected child process
- Scheduled Task/Job: Scheduled Task
PID:1856

C:\Windows\system32\schtasks.exe
schtasks.exe /create /tn "spoolsvs" /sc MINUTE /mo 10 /tr "'C:\Recovery\1f5748e2-69f6-11ef-b486-62cb582c238c\spoolsv.exe'" /rl HIGHEST /f
1⤵
- Process spawned unexpected child process
- Scheduled Task/Job: Scheduled Task
PID:1264

C:\Windows\system32\schtasks.exe
schtasks.exe /create /tn "WmiPrvSEW" /sc MINUTE /mo 8 /tr "'C:\Program Files\Windows Photo Viewer\es-ES\WmiPrvSE.exe'" /f
1⤵
- Process spawned unexpected child process
- Scheduled Task/Job: Scheduled Task
PID:296

C:\Windows\system32\schtasks.exe
schtasks.exe /create /tn "WmiPrvSE" /sc ONLOGON /tr "'C:\Program Files\Windows Photo Viewer\es-ES\WmiPrvSE.exe'" /rl HIGHEST /f
1⤵
- Process spawned unexpected child process
- Scheduled Task/Job: Scheduled Task
PID:2476

C:\Windows\system32\schtasks.exe
schtasks.exe /create /tn "WmiPrvSEW" /sc MINUTE /mo 13 /tr "'C:\Program Files\Windows Photo Viewer\es-ES\WmiPrvSE.exe'" /rl HIGHEST /f
1⤵
- Process spawned unexpected child process
- Scheduled Task/Job: Scheduled Task
PID:2976

C:\Windows\system32\schtasks.exe
schtasks.exe /create /tn "wininitw" /sc MINUTE /mo 13 /tr "'C:\Program Files\7-Zip\Lang\wininit.exe'" /f
1⤵
- Process spawned unexpected child process
- Scheduled Task/Job: Scheduled Task
PID:1720

C:\Windows\system32\schtasks.exe
schtasks.exe /create /tn "wininit" /sc ONLOGON /tr "'C:\Program Files\7-Zip\Lang\wininit.exe'" /rl HIGHEST /f
1⤵
- Process spawned unexpected child process
- Scheduled Task/Job: Scheduled Task
PID:1640

C:\Windows\system32\schtasks.exe
schtasks.exe /create /tn "wininitw" /sc MINUTE /mo 10 /tr "'C:\Program Files\7-Zip\Lang\wininit.exe'" /rl HIGHEST /f
1⤵
- Process spawned unexpected child process
- Scheduled Task/Job: Scheduled Task
PID:2392

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

System Location Discovery

1

T1614

System Language Discovery

1

T1614.001

Lateral Movement

Collection

Command and Control

Exfiltration

Impact

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Downloads

C:\Users\Admin\AppData\Local\Temp\Q9v2X4ctCI.bat

Filesize
225B

MD5
9a5ade03919e393a63e17f4e99a1f6b9

SHA1
08aaafb70e2f026de22f85c5faf2ddcfda9a59d7

SHA256
9d7e5588e2e917639235c95d0c60e19c768d99e157aab062a58cb49ee19ba4b5

SHA512
9b09aa7f32014fbedddf399902dac46fc1927198ce06cfec936553ff2b466ac165612a1c1d35a83872c73fb5c5673fbbaefca42c4a2def3e1d017aa8a0456685

Download Submit
C:\providerbrowserWebFont\5cmX3eeCizBMduOP4xHF1p.bat

Filesize
47B

MD5
e9d505caa65e63b5d93b82e1877f2062

SHA1
0276dfd379ea89be367b66950300a1455a583571

SHA256
21badcf7822aac68d4d060e89fd6f04df3ff68dcd39217ba3863d7503237d101

SHA512
077eb5a528e0015e7c6f8ead1b2351d16abf0a05b6132e04a640b9c40a12234091bae5f9268eeb61b75886449320465619cacdacb7733b502d76b7bc3016d917

Download Submit
C:\providerbrowserWebFont\YIgtMaExFJFBncNn1em9wJcGNWr3f.vbe

Filesize
221B

MD5
06865e53406b18d46604d04a3bd9b396

SHA1
d9e26ebaa48e997333364143c3d8441eb984dca7

SHA256
956279f84b64c8db50862edddfcd9fc43266cab11fced78a0e6d3d2a47e429cc

SHA512
1d8b16ed4aa71712900c394b61f2133c305644fc28266ee95e314c09cbb7671d69ed199a544fdbbc618c1ebb803935203da723909da94b2d9d2b3dbec4f7284b

Download Submit
\providerbrowserWebFont\bridgereviewwin.exe

Filesize
1.1MB

MD5
8a6b7ad242f380978aa7318c3fdafe4f

SHA1
c78489883e9ce873f7a67c0d3ad662adef9a0c61

SHA256
f7a4bc7bacb5fce2daafe9b4db183f60f87528a02832e814417d089a6f6bc2b3

SHA512
198e5fe3fb97f7541ec69511a60cb3baffed07046560f6f4455cc403f71d66f17ddf733511d6bd810312028d22d013897be28e66ddcb6eaa1ba5a91b0ab2079c

Download Submit
memory/2072-39-0x0000000000D40000-0x0000000000E64000-memory.dmp

Filesize
1.1MB

Download
memory/2352-13-0x0000000000120000-0x0000000000244000-memory.dmp

Filesize
1.1MB

Download
memory/2352-14-0x0000000000270000-0x000000000028C000-memory.dmp

Filesize
112KB

Download
memory/2352-15-0x0000000000290000-0x00000000002A6000-memory.dmp

Filesize
88KB

Download

Analysis

Sharing

General

Malware Config

Signatures

Processes

Network

MITRE ATT&CK Enterprise v15

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Downloads