dcrat | 8b67c5a17d70755e35ef3f2ea8c949c1d57d324cd91289102598d1547bcffed7

General

Target

8b67c5a17d70755e35ef3f2ea8c949c1d57d324cd91289102598d1547bcffed7N.exe
Size

1.4MB
MD5

2a3c1d84e60706342147aac7f0240c60
SHA1

19b61cc258f44a8cbead3b7cc312ffb184b8ee1e
SHA256

8b67c5a17d70755e35ef3f2ea8c949c1d57d324cd91289102598d1547bcffed7
SHA512

13f68a2a4bfacd33bcbd1a1b941dd343d747accdd236b1d2ddd57ea210f606fa6dd224809b3a839c9b553aeba2b88386cf2f1e5e7e62fe995df358024672cf3b
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 21 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	2780	2744	schtasks.exe	35
Parent C:\Windows\system32\wbem\wmiprvse.exe is not expected to spawn this process	2976	2744	schtasks.exe	35
Parent C:\Windows\system32\wbem\wmiprvse.exe is not expected to spawn this process	2756	2744	schtasks.exe	35
Parent C:\Windows\system32\wbem\wmiprvse.exe is not expected to spawn this process	2672	2744	schtasks.exe	35
Parent C:\Windows\system32\wbem\wmiprvse.exe is not expected to spawn this process	2648	2744	schtasks.exe	35
Parent C:\Windows\system32\wbem\wmiprvse.exe is not expected to spawn this process	2696	2744	schtasks.exe	35
Parent C:\Windows\system32\wbem\wmiprvse.exe is not expected to spawn this process	2180	2744	schtasks.exe	35
Parent C:\Windows\system32\wbem\wmiprvse.exe is not expected to spawn this process	2168	2744	schtasks.exe	35
Parent C:\Windows\system32\wbem\wmiprvse.exe is not expected to spawn this process	2036	2744	schtasks.exe	35
Parent C:\Windows\system32\wbem\wmiprvse.exe is not expected to spawn this process	2708	2744	schtasks.exe	35
Parent C:\Windows\system32\wbem\wmiprvse.exe is not expected to spawn this process	2812	2744	schtasks.exe	35
Parent C:\Windows\system32\wbem\wmiprvse.exe is not expected to spawn this process	2836	2744	schtasks.exe	35
Parent C:\Windows\system32\wbem\wmiprvse.exe is not expected to spawn this process	1656	2744	schtasks.exe	35
Parent C:\Windows\system32\wbem\wmiprvse.exe is not expected to spawn this process	1164	2744	schtasks.exe	35
Parent C:\Windows\system32\wbem\wmiprvse.exe is not expected to spawn this process	1716	2744	schtasks.exe	35
Parent C:\Windows\system32\wbem\wmiprvse.exe is not expected to spawn this process	1056	2744	schtasks.exe	35
Parent C:\Windows\system32\wbem\wmiprvse.exe is not expected to spawn this process	1276	2744	schtasks.exe	35
Parent C:\Windows\system32\wbem\wmiprvse.exe is not expected to spawn this process	2852	2744	schtasks.exe	35
Parent C:\Windows\system32\wbem\wmiprvse.exe is not expected to spawn this process	2844	2744	schtasks.exe	35
Parent C:\Windows\system32\wbem\wmiprvse.exe is not expected to spawn this process	2960	2744	schtasks.exe	35
Parent C:\Windows\system32\wbem\wmiprvse.exe is not expected to spawn this process	2984	2744	schtasks.exe	35

DCRat payload 3 IoCs

Detects payload of DCRat, commonly dropped by NSIS installers.

rat

resource	yara_rule
behavioral1/files/0x0007000000018687-9.dat	dcrat
behavioral1/memory/2320-13-0x0000000000A60000-0x0000000000B84000-memory.dmp	dcrat
behavioral1/memory/2284-37-0x0000000000940000-0x0000000000A64000-memory.dmp	dcrat

Executes dropped EXE 2 IoCs

pid	Process
2320	bridgereviewwin.exe
2284	smss.exe

Loads dropped DLL 2 IoCs

pid	Process
2252	cmd.exe
2252	cmd.exe

Drops file in Program Files directory 4 IoCs

description	ioc	Process
File created	C:\Program Files\7-Zip\Lang\System.exe	bridgereviewwin.exe
File created	C:\Program Files\7-Zip\Lang\27d1bcfc3c54e0	bridgereviewwin.exe
File created	C:\Program Files (x86)\Windows Mail\ja-JP\csrss.exe	bridgereviewwin.exe
File created	C:\Program Files (x86)\Windows Mail\ja-JP\886983d96e3d3e	bridgereviewwin.exe

Drops file in Windows directory 5 IoCs

description	ioc	Process
File created	C:\Windows\PLA\System\System.exe	bridgereviewwin.exe
File opened for modification	C:\Windows\PLA\System\System.exe	bridgereviewwin.exe
File created	C:\Windows\PLA\System\27d1bcfc3c54e0	bridgereviewwin.exe
File created	C:\Windows\ja-JP\smss.exe	bridgereviewwin.exe
File created	C:\Windows\ja-JP\69ddcba757bf72	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	8b67c5a17d70755e35ef3f2ea8c949c1d57d324cd91289102598d1547bcffed7N.exe
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	WScript.exe

Scheduled Task/Job: Scheduled Task 1 TTPs 21 IoCs

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

persistence execution

Scheduled Task

T1053.005

pid	Process
2844	schtasks.exe
2960	schtasks.exe
2648	schtasks.exe
2708	schtasks.exe
1056	schtasks.exe
1276	schtasks.exe
2852	schtasks.exe
2780	schtasks.exe
2756	schtasks.exe
2168	schtasks.exe
2180	schtasks.exe
2812	schtasks.exe
1656	schtasks.exe
2984	schtasks.exe
2976	schtasks.exe
2672	schtasks.exe
2696	schtasks.exe
1716	schtasks.exe
2036	schtasks.exe
2836	schtasks.exe
1164	schtasks.exe

Suspicious behavior: EnumeratesProcesses 10 IoCs

pid	Process
2320	bridgereviewwin.exe
2284	smss.exe
2284	smss.exe
2284	smss.exe
2284	smss.exe
2284	smss.exe
2284	smss.exe
2284	smss.exe
2284	smss.exe
2284	smss.exe

Suspicious use of AdjustPrivilegeToken 2 IoCs

description	pid	Process
Token: SeDebugPrivilege	2320	bridgereviewwin.exe
Token: SeDebugPrivilege	2284	smss.exe

Suspicious use of WriteProcessMemory 21 IoCs

description	pid	Process	procid_target
PID 2364 wrote to memory of 2380	2364	8b67c5a17d70755e35ef3f2ea8c949c1d57d324cd91289102598d1547bcffed7N.exe	31
PID 2364 wrote to memory of 2380	2364	8b67c5a17d70755e35ef3f2ea8c949c1d57d324cd91289102598d1547bcffed7N.exe	31
PID 2364 wrote to memory of 2380	2364	8b67c5a17d70755e35ef3f2ea8c949c1d57d324cd91289102598d1547bcffed7N.exe	31
PID 2364 wrote to memory of 2380	2364	8b67c5a17d70755e35ef3f2ea8c949c1d57d324cd91289102598d1547bcffed7N.exe	31
PID 2380 wrote to memory of 2252	2380	WScript.exe	32
PID 2380 wrote to memory of 2252	2380	WScript.exe	32
PID 2380 wrote to memory of 2252	2380	WScript.exe	32
PID 2380 wrote to memory of 2252	2380	WScript.exe	32
PID 2252 wrote to memory of 2320	2252	cmd.exe	34
PID 2252 wrote to memory of 2320	2252	cmd.exe	34
PID 2252 wrote to memory of 2320	2252	cmd.exe	34
PID 2252 wrote to memory of 2320	2252	cmd.exe	34
PID 2320 wrote to memory of 2440	2320	bridgereviewwin.exe	57
PID 2320 wrote to memory of 2440	2320	bridgereviewwin.exe	57
PID 2320 wrote to memory of 2440	2320	bridgereviewwin.exe	57
PID 2440 wrote to memory of 2656	2440	cmd.exe	59
PID 2440 wrote to memory of 2656	2440	cmd.exe	59
PID 2440 wrote to memory of 2656	2440	cmd.exe	59
PID 2440 wrote to memory of 2284	2440	cmd.exe	60
PID 2440 wrote to memory of 2284	2440	cmd.exe	60
PID 2440 wrote to memory of 2284	2440	cmd.exe	60

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\8b67c5a17d70755e35ef3f2ea8c949c1d57d324cd91289102598d1547bcffed7N.exe
"C:\Users\Admin\AppData\Local\Temp\8b67c5a17d70755e35ef3f2ea8c949c1d57d324cd91289102598d1547bcffed7N.exe"
1⤵
- System Location Discovery: System Language Discovery
- Suspicious use of WriteProcessMemory
PID:2364
- 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:2380
- - 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:2252
  - - 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:2320
    - - C:\Windows\System32\cmd.exe
        
        "C:\Windows\System32\cmd.exe" /C "C:\Users\Admin\AppData\Local\Temp\svxx5o0Swo.bat"
        5⤵
        Suspicious use of WriteProcessMemory
        
        PID:2440
      - C:\Windows\system32\w32tm.exe
        
        w32tm /stripchart /computer:localhost /period:5 /dataonly /samples:2
        6⤵
        
        PID:2656
      - C:\Windows\ja-JP\smss.exe
        
        "C:\Windows\ja-JP\smss.exe"
        6⤵
        Executes dropped EXE
        Suspicious behavior: EnumeratesProcesses
        Suspicious use of AdjustPrivilegeToken
        
        PID:2284

C:\Windows\system32\schtasks.exe
schtasks.exe /create /tn "SystemS" /sc MINUTE /mo 5 /tr "'C:\Windows\PLA\System\System.exe'" /f
1⤵
- Process spawned unexpected child process
- Scheduled Task/Job: Scheduled Task
PID:2780

C:\Windows\system32\schtasks.exe
schtasks.exe /create /tn "System" /sc ONLOGON /tr "'C:\Windows\PLA\System\System.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 "SystemS" /sc MINUTE /mo 11 /tr "'C:\Windows\PLA\System\System.exe'" /rl HIGHEST /f
1⤵
- Process spawned unexpected child process
- Scheduled Task/Job: Scheduled Task
PID:2756

C:\Windows\system32\schtasks.exe
schtasks.exe /create /tn "SystemS" /sc MINUTE /mo 11 /tr "'C:\Program Files\7-Zip\Lang\System.exe'" /f
1⤵
- Process spawned unexpected child process
- Scheduled Task/Job: Scheduled Task
PID:2672

C:\Windows\system32\schtasks.exe
schtasks.exe /create /tn "System" /sc ONLOGON /tr "'C:\Program Files\7-Zip\Lang\System.exe'" /rl HIGHEST /f
1⤵
- Process spawned unexpected child process
- Scheduled Task/Job: Scheduled Task
PID:2648

C:\Windows\system32\schtasks.exe
schtasks.exe /create /tn "SystemS" /sc MINUTE /mo 7 /tr "'C:\Program Files\7-Zip\Lang\System.exe'" /rl HIGHEST /f
1⤵
- Process spawned unexpected child process
- Scheduled Task/Job: Scheduled Task
PID:2696

C:\Windows\system32\schtasks.exe
schtasks.exe /create /tn "smsss" /sc MINUTE /mo 13 /tr "'C:\Windows\ja-JP\smss.exe'" /f
1⤵
- Process spawned unexpected child process
- Scheduled Task/Job: Scheduled Task
PID:2180

C:\Windows\system32\schtasks.exe
schtasks.exe /create /tn "smss" /sc ONLOGON /tr "'C:\Windows\ja-JP\smss.exe'" /rl HIGHEST /f
1⤵
- Process spawned unexpected child process
- Scheduled Task/Job: Scheduled Task
PID:2168

C:\Windows\system32\schtasks.exe
schtasks.exe /create /tn "smsss" /sc MINUTE /mo 12 /tr "'C:\Windows\ja-JP\smss.exe'" /rl HIGHEST /f
1⤵
- Process spawned unexpected child process
- Scheduled Task/Job: Scheduled Task
PID:2036

C:\Windows\system32\schtasks.exe
schtasks.exe /create /tn "csrssc" /sc MINUTE /mo 11 /tr "'C:\Program Files (x86)\Windows Mail\ja-JP\csrss.exe'" /f
1⤵
- Process spawned unexpected child process
- Scheduled Task/Job: Scheduled Task
PID:2708

C:\Windows\system32\schtasks.exe
schtasks.exe /create /tn "csrss" /sc ONLOGON /tr "'C:\Program Files (x86)\Windows Mail\ja-JP\csrss.exe'" /rl HIGHEST /f
1⤵
- Process spawned unexpected child process
- Scheduled Task/Job: Scheduled Task
PID:2812

C:\Windows\system32\schtasks.exe
schtasks.exe /create /tn "csrssc" /sc MINUTE /mo 9 /tr "'C:\Program Files (x86)\Windows Mail\ja-JP\csrss.exe'" /rl HIGHEST /f
1⤵
- Process spawned unexpected child process
- Scheduled Task/Job: Scheduled Task
PID:2836

C:\Windows\system32\schtasks.exe
schtasks.exe /create /tn "taskhostt" /sc MINUTE /mo 9 /tr "'C:\providerbrowserWebFont\taskhost.exe'" /f
1⤵
- Process spawned unexpected child process
- Scheduled Task/Job: Scheduled Task
PID:1656

C:\Windows\system32\schtasks.exe
schtasks.exe /create /tn "taskhost" /sc ONLOGON /tr "'C:\providerbrowserWebFont\taskhost.exe'" /rl HIGHEST /f
1⤵
- Process spawned unexpected child process
- Scheduled Task/Job: Scheduled Task
PID:1164

C:\Windows\system32\schtasks.exe
schtasks.exe /create /tn "taskhostt" /sc MINUTE /mo 7 /tr "'C:\providerbrowserWebFont\taskhost.exe'" /rl HIGHEST /f
1⤵
- Process spawned unexpected child process
- Scheduled Task/Job: Scheduled Task
PID:1716

C:\Windows\system32\schtasks.exe
schtasks.exe /create /tn "WmiPrvSEW" /sc MINUTE /mo 13 /tr "'C:\Users\All Users\WmiPrvSE.exe'" /f
1⤵
- Process spawned unexpected child process
- Scheduled Task/Job: Scheduled Task
PID:1056

C:\Windows\system32\schtasks.exe
schtasks.exe /create /tn "WmiPrvSE" /sc ONLOGON /tr "'C:\Users\All Users\WmiPrvSE.exe'" /rl HIGHEST /f
1⤵
- Process spawned unexpected child process
- Scheduled Task/Job: Scheduled Task
PID:1276

C:\Windows\system32\schtasks.exe
schtasks.exe /create /tn "WmiPrvSEW" /sc MINUTE /mo 14 /tr "'C:\Users\All Users\WmiPrvSE.exe'" /rl HIGHEST /f
1⤵
- Process spawned unexpected child process
- Scheduled Task/Job: Scheduled Task
PID:2852

C:\Windows\system32\schtasks.exe
schtasks.exe /create /tn "spoolsvs" /sc MINUTE /mo 9 /tr "'C:\providerbrowserWebFont\spoolsv.exe'" /f
1⤵
- Process spawned unexpected child process
- Scheduled Task/Job: Scheduled Task
PID:2844

C:\Windows\system32\schtasks.exe
schtasks.exe /create /tn "spoolsv" /sc ONLOGON /tr "'C:\providerbrowserWebFont\spoolsv.exe'" /rl HIGHEST /f
1⤵
- Process spawned unexpected child process
- Scheduled Task/Job: Scheduled Task
PID:2960

C:\Windows\system32\schtasks.exe
schtasks.exe /create /tn "spoolsvs" /sc MINUTE /mo 13 /tr "'C:\providerbrowserWebFont\spoolsv.exe'" /rl HIGHEST /f
1⤵
- Process spawned unexpected child process
- Scheduled Task/Job: Scheduled Task
PID:2984

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\svxx5o0Swo.bat

Filesize
190B

MD5
fad31747c319803597c036e913f65ac0

SHA1
ebfbde0f2f7479c440ddd64962ef35fef2406e74

SHA256
72b101b2514586df4e15ef364622eb98f55c782c3f96501a2a1b04d589d3fdd5

SHA512
96448d20242138293df4df0950a937eb84c299089c5dcbcd1d3e659cb735618d06d4cc1b8525e13b84884b555894b395aa2987e58bff05cf524f94bc7b106e38

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/2284-37-0x0000000000940000-0x0000000000A64000-memory.dmp

Filesize
1.1MB

Download
memory/2320-13-0x0000000000A60000-0x0000000000B84000-memory.dmp

Filesize
1.1MB

Download
memory/2320-14-0x00000000006C0000-0x00000000006DC000-memory.dmp

Filesize
112KB

Download
memory/2320-15-0x0000000000A30000-0x0000000000A46000-memory.dmp

Filesize
88KB

Download

Analysis

Sharing

General

Malware Config

Signatures

Processes

Network

MITRE ATT&CK Enterprise v15

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Downloads