dcrat | 9a5b5447b67c7f165689b1e1c5f65f92663425b527aacc4d9ec73e66d29e2692

General

Target

9a5b5447b67c7f165689b1e1c5f65f92663425b527aacc4d9ec73e66d29e2692N.exe
Size

1.1MB
MD5

d2f57cf55387c9146158f49dbcf5b540
SHA1

57fb9892bdf6362073eb3cb1452a291568b49e23
SHA256

9a5b5447b67c7f165689b1e1c5f65f92663425b527aacc4d9ec73e66d29e2692
SHA512

5d2da7dcbe87ceee345b95d99fc47a209a5621c88483fdb3484493f75fe0e8cc5802703dcd44e068a83738401b7e6a8edaeef7b098a804ae4989ccfb2ef4f78e
SSDEEP

24576:U2G/nvxW3Ww0tI2qYVrBvevwx8P9brkuXq:UbA30I2TvkPOf

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 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	1724	4192	schtasks.exe	86
Parent C:\Windows\system32\wbem\wmiprvse.exe is not expected to spawn this process	2200	4192	schtasks.exe	86
Parent C:\Windows\system32\wbem\wmiprvse.exe is not expected to spawn this process	3316	4192	schtasks.exe	86
Parent C:\Windows\system32\wbem\wmiprvse.exe is not expected to spawn this process	4080	4192	schtasks.exe	86
Parent C:\Windows\system32\wbem\wmiprvse.exe is not expected to spawn this process	1416	4192	schtasks.exe	86
Parent C:\Windows\system32\wbem\wmiprvse.exe is not expected to spawn this process	4472	4192	schtasks.exe	86

DCRat payload 2 IoCs

Detects payload of DCRat, commonly dropped by NSIS installers.

rat

resource	yara_rule
behavioral2/memory/4664-13-0x00000000008A0000-0x0000000000976000-memory.dmp	dcrat
behavioral2/files/0x0007000000023caa-11.dat	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-1-5-21-4089630652-1596403869-279772308-1000\Control Panel\International\Geo\Nation	9a5b5447b67c7f165689b1e1c5f65f92663425b527aacc4d9ec73e66d29e2692N.exe
Key value queried	\REGISTRY\USER\S-1-5-21-4089630652-1596403869-279772308-1000\Control Panel\International\Geo\Nation	WScript.exe
Key value queried	\REGISTRY\USER\S-1-5-21-4089630652-1596403869-279772308-1000\Control Panel\International\Geo\Nation	MsBlock.exe

Executes dropped EXE 2 IoCs

pid	Process
4664	MsBlock.exe
320	sihost.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	9a5b5447b67c7f165689b1e1c5f65f92663425b527aacc4d9ec73e66d29e2692N.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-1-5-21-4089630652-1596403869-279772308-1000_Classes\Local Settings	9a5b5447b67c7f165689b1e1c5f65f92663425b527aacc4d9ec73e66d29e2692N.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
4080	schtasks.exe
1416	schtasks.exe
4472	schtasks.exe
1724	schtasks.exe
2200	schtasks.exe
3316	schtasks.exe

Suspicious behavior: EnumeratesProcesses 14 IoCs

pid	Process
4664	MsBlock.exe
4664	MsBlock.exe
4664	MsBlock.exe
4664	MsBlock.exe
4664	MsBlock.exe
4664	MsBlock.exe
4664	MsBlock.exe
4664	MsBlock.exe
4664	MsBlock.exe
4664	MsBlock.exe
4664	MsBlock.exe
4664	MsBlock.exe
4664	MsBlock.exe
320	sihost.exe

Suspicious use of AdjustPrivilegeToken 2 IoCs

description	pid	Process
Token: SeDebugPrivilege	4664	MsBlock.exe
Token: SeDebugPrivilege	320	sihost.exe

Suspicious use of WriteProcessMemory 10 IoCs

description	pid	Process	procid_target
PID 4988 wrote to memory of 216	4988	9a5b5447b67c7f165689b1e1c5f65f92663425b527aacc4d9ec73e66d29e2692N.exe	82
PID 4988 wrote to memory of 216	4988	9a5b5447b67c7f165689b1e1c5f65f92663425b527aacc4d9ec73e66d29e2692N.exe	82
PID 4988 wrote to memory of 216	4988	9a5b5447b67c7f165689b1e1c5f65f92663425b527aacc4d9ec73e66d29e2692N.exe	82
PID 216 wrote to memory of 2660	216	WScript.exe	83
PID 216 wrote to memory of 2660	216	WScript.exe	83
PID 216 wrote to memory of 2660	216	WScript.exe	83
PID 2660 wrote to memory of 4664	2660	cmd.exe	85
PID 2660 wrote to memory of 4664	2660	cmd.exe	85
PID 4664 wrote to memory of 320	4664	MsBlock.exe	93
PID 4664 wrote to memory of 320	4664	MsBlock.exe	93

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\9a5b5447b67c7f165689b1e1c5f65f92663425b527aacc4d9ec73e66d29e2692N.exe
"C:\Users\Admin\AppData\Local\Temp\9a5b5447b67c7f165689b1e1c5f65f92663425b527aacc4d9ec73e66d29e2692N.exe"
1⤵
- Checks computer location settings
- System Location Discovery: System Language Discovery
- Modifies registry class
- Suspicious use of WriteProcessMemory
PID:4988
- C:\Windows\SysWOW64\WScript.exe
  "C:\Windows\System32\WScript.exe" "C:\intoHost\pN2iKIl2JrbfNIx.vbe"
  2⤵
  - Checks computer location settings
  - System Location Discovery: System Language Discovery
  - Suspicious use of WriteProcessMemory
  PID:216
- - C:\Windows\SysWOW64\cmd.exe
    C:\Windows\system32\cmd.exe /c ""C:\intoHost\z07BaoIs8R5lt5yU6uoZdloB3t.bat" "
    3⤵
    - System Location Discovery: System Language Discovery
    - Suspicious use of WriteProcessMemory
    PID:2660
  - - C:\intoHost\MsBlock.exe
      "C:\intoHost\MsBlock.exe"
      4⤵
      Checks computer location settings
      Executes dropped EXE
      Suspicious behavior: EnumeratesProcesses
      Suspicious use of AdjustPrivilegeToken
      Suspicious use of WriteProcessMemory
      PID:4664
    - - C:\Users\Default User\sihost.exe
        
        "C:\Users\Default User\sihost.exe"
        5⤵
        Executes dropped EXE
        Suspicious behavior: EnumeratesProcesses
        Suspicious use of AdjustPrivilegeToken
        
        PID:320

C:\Windows\system32\schtasks.exe
schtasks.exe /create /tn "RuntimeBrokerR" /sc MINUTE /mo 11 /tr "'C:\Recovery\WindowsRE\RuntimeBroker.exe'" /f
1⤵
- Process spawned unexpected child process
- Scheduled Task/Job: Scheduled Task
PID:4472

C:\Windows\system32\schtasks.exe
schtasks.exe /create /tn "RuntimeBroker" /sc ONLOGON /tr "'C:\Recovery\WindowsRE\RuntimeBroker.exe'" /rl HIGHEST /f
1⤵
- Process spawned unexpected child process
- Scheduled Task/Job: Scheduled Task
PID:1724

C:\Windows\system32\schtasks.exe
schtasks.exe /create /tn "RuntimeBrokerR" /sc MINUTE /mo 5 /tr "'C:\Recovery\WindowsRE\RuntimeBroker.exe'" /rl HIGHEST /f
1⤵
- Process spawned unexpected child process
- Scheduled Task/Job: Scheduled Task
PID:1416

C:\Windows\system32\schtasks.exe
schtasks.exe /create /tn "sihosts" /sc MINUTE /mo 13 /tr "'C:\Users\Default User\sihost.exe'" /f
1⤵
- Process spawned unexpected child process
- Scheduled Task/Job: Scheduled Task
PID:4080

C:\Windows\system32\schtasks.exe
schtasks.exe /create /tn "sihost" /sc ONLOGON /tr "'C:\Users\Default User\sihost.exe'" /rl HIGHEST /f
1⤵
- Process spawned unexpected child process
- Scheduled Task/Job: Scheduled Task
PID:3316

C:\Windows\system32\schtasks.exe
schtasks.exe /create /tn "sihosts" /sc MINUTE /mo 10 /tr "'C:\Users\Default User\sihost.exe'" /rl HIGHEST /f
1⤵
- Process spawned unexpected child process
- Scheduled Task/Job: Scheduled Task
PID:2200

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

2

T1012

System Information Discovery

2

T1082

System Location Discovery

1

T1614

System Language Discovery

1

T1614.001

Lateral Movement

Collection

Command and Control

Exfiltration

Impact

Replay Monitor

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Downloads

C:\intoHost\MsBlock.exe

Filesize
828KB

MD5
dca7880645d6318a20d020f2a51b7a8c

SHA1
5c5e493ce685a79ecb58ef2fdc6d9a4364c0a276

SHA256
9c03c25f02d71bfc3ab23870d882274e9b34626d1374491529818e19851510b9

SHA512
3fa226e65382fed9f3dd959e80e4483866da3b339c277906ab1b08db067be6f6ec1d73b9ad3067b4046e512f8f08940528bf8573edc83d999f18f890fc210807

Download Submit
C:\intoHost\pN2iKIl2JrbfNIx.vbe

Filesize
211B

MD5
672ef18aa1c9cf2cf6c906bba7d1435b

SHA1
4d72a4c6cb3aaeef5b02cef71ad42211f185c93a

SHA256
a016b82ba799c1cf780c9ebb6cf0540c26aad664f5525d1ccc8b470fdaaa0075

SHA512
8b5d37f4fb7b1df56118866f9cc18d0ce323167185258b2e8b830d91f20e2ee85eda6b145f25d363630790ddf7d188eb1507f051095fc63be4bfaef1760bc20e

Download Submit
C:\intoHost\z07BaoIs8R5lt5yU6uoZdloB3t.bat

Filesize
25B

MD5
5c9b6d735522c5246a33bbadaa92c7db

SHA1
f676e86ecb933d676095e187a50febbd61bbc344

SHA256
47148fdb946ede0b9fab190f1ae5dd459d096873cca3585642183674313fe551

SHA512
63fafa045ca419b1394b2255ef32bf4fb6a40ff8b45ade892723ec41a50a831cce7c4266e489f825dc4e574d07b38e216c12337a89743c70e6de35470e798875

Download Submit
memory/4664-13-0x00000000008A0000-0x0000000000976000-memory.dmp

Filesize
856KB

Download
memory/4664-12-0x00007FFF17A03000-0x00007FFF17A05000-memory.dmp

Filesize
8KB

Download

Analysis

Sharing

General

Malware Config

Signatures

Processes

Network

MITRE ATT&CK Enterprise v15

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Downloads