dcrat | b26bd1c0f18de40e6123428988234b21640203431c5f66e2d602e805511f9e79

Analysis

max time kernel
54s
max time network
126s
platform
windows7_x64
resource
win7-20240704-en
resource tags

arch:x64arch:x86image:win7-20240704-enlocale:en-usos:windows7-x64system
submitted
25/07/2024, 03:48

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General

Target
69c5ea0a44027e82bab6de842c2736e0N.exe
Size 2.6MB
Sample240725-ecs8dszdjg
SHA256 b26bd1c0f18de40e6123428988234b21640203431c5f66e2d602e805511f9e79
MD5 69c5ea0a44027e82bab6de842c2736e0
SHA1 f9fca090c82aa851b94b6cb3f6a8e59d1eaf46ce
SHA512 de370686ce72d5d4b42b9c445eab8bcc5f6ef0dd27d2e5e59dfc24fcb052e7ea4869fc690873b637bdc56ad363bf3c87a6a2e769aab2e9c4ec29a076d1dc9f6f
SSDEEP 49152:UbA303peNkzjI6lp/5xblQ94oT4mbaUpCVvUwi2FUTGWK/ZJ8PFjw:UblYo/5xbGTT4J3VvRi5TGWsadw
MD5 SHA1 SHA512 SSDEEP

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

Process spawned unexpected child process 18 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	2528	2628	schtasks.exe	34
Parent C:\Windows\system32\wbem\wmiprvse.exe is not expected to spawn this process	2568	2628	schtasks.exe	34
Parent C:\Windows\system32\wbem\wmiprvse.exe is not expected to spawn this process	1536	2628	schtasks.exe	34
Parent C:\Windows\system32\wbem\wmiprvse.exe is not expected to spawn this process	1504	2628	schtasks.exe	34
Parent C:\Windows\system32\wbem\wmiprvse.exe is not expected to spawn this process	2500	2628	schtasks.exe	34
Parent C:\Windows\system32\wbem\wmiprvse.exe is not expected to spawn this process	288	2628	schtasks.exe	34
Parent C:\Windows\system32\wbem\wmiprvse.exe is not expected to spawn this process	2612	2628	schtasks.exe	34
Parent C:\Windows\system32\wbem\wmiprvse.exe is not expected to spawn this process	2332	2628	schtasks.exe	34
Parent C:\Windows\system32\wbem\wmiprvse.exe is not expected to spawn this process	2420	2628	schtasks.exe	34
Parent C:\Windows\system32\wbem\wmiprvse.exe is not expected to spawn this process	1292	2628	schtasks.exe	34
Parent C:\Windows\system32\wbem\wmiprvse.exe is not expected to spawn this process	2584	2628	schtasks.exe	34
Parent C:\Windows\system32\wbem\wmiprvse.exe is not expected to spawn this process	2844	2628	schtasks.exe	34
Parent C:\Windows\system32\wbem\wmiprvse.exe is not expected to spawn this process	2836	2628	schtasks.exe	34
Parent C:\Windows\system32\wbem\wmiprvse.exe is not expected to spawn this process	1708	2628	schtasks.exe	34
Parent C:\Windows\system32\wbem\wmiprvse.exe is not expected to spawn this process	556	2628	schtasks.exe	34
Parent C:\Windows\system32\wbem\wmiprvse.exe is not expected to spawn this process	2036	2628	schtasks.exe	34
Parent C:\Windows\system32\wbem\wmiprvse.exe is not expected to spawn this process	396	2628	schtasks.exe	34
Parent C:\Windows\system32\wbem\wmiprvse.exe is not expected to spawn this process	2944	2628	schtasks.exe	34

DCRat payload 3 IoCs

Detects payload of DCRat, commonly dropped by NSIS installers.

rat

resource	yara_rule
behavioral1/files/0x0006000000018bac-9.dat	dcrat
behavioral1/memory/2672-13-0x00000000010B0000-0x00000000012FE000-memory.dmp	dcrat
behavioral1/memory/2884-38-0x0000000000D50000-0x0000000000F9E000-memory.dmp	dcrat

Executes dropped EXE 2 IoCs

pid	Process
2672	agentWeb.exe
2884	explorer.exe

Loads dropped DLL 2 IoCs

pid	Process
2732	cmd.exe
2732	cmd.exe

Drops file in Program Files directory 2 IoCs

description	ioc	Process
File created	C:\Program Files\Reference Assemblies\Microsoft\explorer.exe	agentWeb.exe
File created	C:\Program Files\Reference Assemblies\Microsoft\7a0fd90576e088	agentWeb.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	WScript.exe
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	cmd.exe
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	69c5ea0a44027e82bab6de842c2736e0N.exe

Scheduled Task/Job: Scheduled Task 1 TTPs 18 IoCs

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

persistence execution

Scheduled Task

T1053.005

pid	Process
2568	schtasks.exe
2500	schtasks.exe
2612	schtasks.exe
2420	schtasks.exe
396	schtasks.exe
2944	schtasks.exe
2528	schtasks.exe
1504	schtasks.exe
288	schtasks.exe
2844	schtasks.exe
1708	schtasks.exe
556	schtasks.exe
1536	schtasks.exe
2332	schtasks.exe
1292	schtasks.exe
2584	schtasks.exe
2836	schtasks.exe
2036	schtasks.exe

Suspicious behavior: EnumeratesProcesses 14 IoCs

pid	Process
2672	agentWeb.exe
2672	agentWeb.exe
2672	agentWeb.exe
2672	agentWeb.exe
2672	agentWeb.exe
2884	explorer.exe
2884	explorer.exe
2884	explorer.exe
2884	explorer.exe
2884	explorer.exe
2884	explorer.exe
2884	explorer.exe
2884	explorer.exe
2884	explorer.exe

Suspicious use of AdjustPrivilegeToken 2 IoCs

description	pid	Process
Token: SeDebugPrivilege	2672	agentWeb.exe
Token: SeDebugPrivilege	2884	explorer.exe

Suspicious use of WriteProcessMemory 21 IoCs

description	pid	Process	procid_target
PID 2424 wrote to memory of 740	2424	69c5ea0a44027e82bab6de842c2736e0N.exe	30
PID 2424 wrote to memory of 740	2424	69c5ea0a44027e82bab6de842c2736e0N.exe	30
PID 2424 wrote to memory of 740	2424	69c5ea0a44027e82bab6de842c2736e0N.exe	30
PID 2424 wrote to memory of 740	2424	69c5ea0a44027e82bab6de842c2736e0N.exe	30
PID 740 wrote to memory of 2732	740	WScript.exe	31
PID 740 wrote to memory of 2732	740	WScript.exe	31
PID 740 wrote to memory of 2732	740	WScript.exe	31
PID 740 wrote to memory of 2732	740	WScript.exe	31
PID 2732 wrote to memory of 2672	2732	cmd.exe	33
PID 2732 wrote to memory of 2672	2732	cmd.exe	33
PID 2732 wrote to memory of 2672	2732	cmd.exe	33
PID 2732 wrote to memory of 2672	2732	cmd.exe	33
PID 2672 wrote to memory of 1880	2672	agentWeb.exe	53
PID 2672 wrote to memory of 1880	2672	agentWeb.exe	53
PID 2672 wrote to memory of 1880	2672	agentWeb.exe	53
PID 1880 wrote to memory of 2168	1880	cmd.exe	55
PID 1880 wrote to memory of 2168	1880	cmd.exe	55
PID 1880 wrote to memory of 2168	1880	cmd.exe	55
PID 1880 wrote to memory of 2884	1880	cmd.exe	56
PID 1880 wrote to memory of 2884	1880	cmd.exe	56
PID 1880 wrote to memory of 2884	1880	cmd.exe	56

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\69c5ea0a44027e82bab6de842c2736e0N.exe
"C:\Users\Admin\AppData\Local\Temp\69c5ea0a44027e82bab6de842c2736e0N.exe"
1⤵
- System Location Discovery: System Language Discovery
- Suspicious use of WriteProcessMemory
PID:2424
- C:\Windows\SysWOW64\WScript.exe
  "C:\Windows\System32\WScript.exe" "C:\PortsurrogateRefBroker\6O4ZKdsS9YLdfMGrXlv6UX.vbe"
  2⤵
  - System Location Discovery: System Language Discovery
  - Suspicious use of WriteProcessMemory
  PID:740
- - C:\Windows\SysWOW64\cmd.exe
    cmd /c ""C:\PortsurrogateRefBroker\PG5XI6tflf9wFGpWTuMeLdwspHl.bat" "
    3⤵
    - Loads dropped DLL
    - System Location Discovery: System Language Discovery
    - Suspicious use of WriteProcessMemory
    PID:2732
  - - C:\PortsurrogateRefBroker\agentWeb.exe
      "C:\PortsurrogateRefBroker\agentWeb.exe"
      4⤵
      Executes dropped EXE
      Drops file in Program Files directory
      Suspicious behavior: EnumeratesProcesses
      Suspicious use of AdjustPrivilegeToken
      Suspicious use of WriteProcessMemory
      PID:2672
    - - C:\Windows\System32\cmd.exe
        
        "C:\Windows\System32\cmd.exe" /C "C:\Users\Admin\AppData\Local\Temp\PceSsFafAw.bat"
        5⤵
        Suspicious use of WriteProcessMemory
        
        PID:1880
      - C:\Windows\system32\w32tm.exe
        
        w32tm /stripchart /computer:localhost /period:5 /dataonly /samples:2
        6⤵
        
        PID:2168
      - C:\PortsurrogateRefBroker\explorer.exe
        
        "C:\PortsurrogateRefBroker\explorer.exe"
        6⤵
        Executes dropped EXE
        Suspicious behavior: EnumeratesProcesses
        Suspicious use of AdjustPrivilegeToken
        
        PID:2884

C:\Windows\system32\schtasks.exe
schtasks.exe /create /tn "servicess" /sc MINUTE /mo 10 /tr "'C:\Recovery\ba13f242-3a65-11ef-94cb-d685e2345d05\services.exe'" /f
1⤵
- Process spawned unexpected child process
- Scheduled Task/Job: Scheduled Task
PID:2528

C:\Windows\system32\schtasks.exe
schtasks.exe /create /tn "services" /sc ONLOGON /tr "'C:\Recovery\ba13f242-3a65-11ef-94cb-d685e2345d05\services.exe'" /rl HIGHEST /f
1⤵
- Process spawned unexpected child process
- Scheduled Task/Job: Scheduled Task
PID:2568

C:\Windows\system32\schtasks.exe
schtasks.exe /create /tn "servicess" /sc MINUTE /mo 14 /tr "'C:\Recovery\ba13f242-3a65-11ef-94cb-d685e2345d05\services.exe'" /rl HIGHEST /f
1⤵
- Process spawned unexpected child process
- Scheduled Task/Job: Scheduled Task
PID:1536

C:\Windows\system32\schtasks.exe
schtasks.exe /create /tn "lsml" /sc MINUTE /mo 11 /tr "'C:\Recovery\ba13f242-3a65-11ef-94cb-d685e2345d05\lsm.exe'" /f
1⤵
- Process spawned unexpected child process
- Scheduled Task/Job: Scheduled Task
PID:1504

C:\Windows\system32\schtasks.exe
schtasks.exe /create /tn "lsm" /sc ONLOGON /tr "'C:\Recovery\ba13f242-3a65-11ef-94cb-d685e2345d05\lsm.exe'" /rl HIGHEST /f
1⤵
- Process spawned unexpected child process
- Scheduled Task/Job: Scheduled Task
PID:2500

C:\Windows\system32\schtasks.exe
schtasks.exe /create /tn "lsml" /sc MINUTE /mo 8 /tr "'C:\Recovery\ba13f242-3a65-11ef-94cb-d685e2345d05\lsm.exe'" /rl HIGHEST /f
1⤵
- Process spawned unexpected child process
- Scheduled Task/Job: Scheduled Task
PID:288

C:\Windows\system32\schtasks.exe
schtasks.exe /create /tn "explorere" /sc MINUTE /mo 14 /tr "'C:\Program Files\Reference Assemblies\Microsoft\explorer.exe'" /f
1⤵
- Process spawned unexpected child process
- Scheduled Task/Job: Scheduled Task
PID:2612

C:\Windows\system32\schtasks.exe
schtasks.exe /create /tn "explorer" /sc ONLOGON /tr "'C:\Program Files\Reference Assemblies\Microsoft\explorer.exe'" /rl HIGHEST /f
1⤵
- Process spawned unexpected child process
- Scheduled Task/Job: Scheduled Task
PID:2332

C:\Windows\system32\schtasks.exe
schtasks.exe /create /tn "explorere" /sc MINUTE /mo 12 /tr "'C:\Program Files\Reference Assemblies\Microsoft\explorer.exe'" /rl HIGHEST /f
1⤵
- Process spawned unexpected child process
- Scheduled Task/Job: Scheduled Task
PID:2420

C:\Windows\system32\schtasks.exe
schtasks.exe /create /tn "IdleI" /sc MINUTE /mo 8 /tr "'C:\Users\Admin\PrintHood\Idle.exe'" /f
1⤵
- Process spawned unexpected child process
- Scheduled Task/Job: Scheduled Task
PID:1292

C:\Windows\system32\schtasks.exe
schtasks.exe /create /tn "Idle" /sc ONLOGON /tr "'C:\Users\Admin\PrintHood\Idle.exe'" /rl HIGHEST /f
1⤵
- Process spawned unexpected child process
- Scheduled Task/Job: Scheduled Task
PID:2584

C:\Windows\system32\schtasks.exe
schtasks.exe /create /tn "IdleI" /sc MINUTE /mo 11 /tr "'C:\Users\Admin\PrintHood\Idle.exe'" /rl HIGHEST /f
1⤵
- Process spawned unexpected child process
- Scheduled Task/Job: Scheduled Task
PID:2844

C:\Windows\system32\schtasks.exe
schtasks.exe /create /tn "sppsvcs" /sc MINUTE /mo 6 /tr "'C:\PortsurrogateRefBroker\sppsvc.exe'" /f
1⤵
- Process spawned unexpected child process
- Scheduled Task/Job: Scheduled Task
PID:2836

C:\Windows\system32\schtasks.exe
schtasks.exe /create /tn "sppsvc" /sc ONLOGON /tr "'C:\PortsurrogateRefBroker\sppsvc.exe'" /rl HIGHEST /f
1⤵
- Process spawned unexpected child process
- Scheduled Task/Job: Scheduled Task
PID:1708

C:\Windows\system32\schtasks.exe
schtasks.exe /create /tn "sppsvcs" /sc MINUTE /mo 14 /tr "'C:\PortsurrogateRefBroker\sppsvc.exe'" /rl HIGHEST /f
1⤵
- Process spawned unexpected child process
- Scheduled Task/Job: Scheduled Task
PID:556

C:\Windows\system32\schtasks.exe
schtasks.exe /create /tn "explorere" /sc MINUTE /mo 6 /tr "'C:\PortsurrogateRefBroker\explorer.exe'" /f
1⤵
- Process spawned unexpected child process
- Scheduled Task/Job: Scheduled Task
PID:2036

C:\Windows\system32\schtasks.exe
schtasks.exe /create /tn "explorer" /sc ONLOGON /tr "'C:\PortsurrogateRefBroker\explorer.exe'" /rl HIGHEST /f
1⤵
- Process spawned unexpected child process
- Scheduled Task/Job: Scheduled Task
PID:396

C:\Windows\system32\schtasks.exe
schtasks.exe /create /tn "explorere" /sc MINUTE /mo 5 /tr "'C:\PortsurrogateRefBroker\explorer.exe'" /rl HIGHEST /f
1⤵
- Process spawned unexpected child process
- Scheduled Task/Job: Scheduled Task
PID:2944

Network

MITRE ATT&CK Enterprise v15

Reconnaissance

Resource Development

Initial Access

Execution

Scheduled Task/Job

T1053

Scheduled Task

T1053.005

Persistence

Scheduled Task/Job

T1053

Scheduled Task

T1053.005

Privilege Escalation

Scheduled Task/Job

T1053

Scheduled Task

T1053.005

Defense Evasion

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

6O4ZKdsS9YLdfMGrXlv6UX.vbe

Path C:\PortsurrogateRefBroker\6O4ZKdsS9YLdfMGrXlv6UX.vbe
Size 226B
SHA256 3a98cbc48815b464d277a0df33d7b9945cf199a51fb95311dfd952d360534376
MD5 8fc7c988fab4354676da51a891e4dff8
SHA1 1f0f76c0877214ea21d83765a67142952073a04d
SHA512 cf1b2f1401b849a91cac570a8ac226d8c9c27be238d0950c7a1b53476c186272533db6508cf6d820d328904201ade44c6f6047f13882a0d5642ee37c372dad25
MD5 SHA1 SHA512

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PG5XI6tflf9wFGpWTuMeLdwspHl.bat

Path C:\PortsurrogateRefBroker\PG5XI6tflf9wFGpWTuMeLdwspHl.bat
Size 40B
SHA256 19547e2acb53b7ad4c2bd6416ca40281671f7b1d05a6fffa0268e5563d59fb8a
MD5 852d2ba781fa5b950a28cbda58000a17
SHA1 539c6187f1ec6f5b70728c38c01a3606954eee8c
SHA512 c8f8a83bca2332cb4073b01b0fbd81905e62f92702555769c4e3abf820f71744b4ecbdd267c4e5adbd2e78a2fdd1986641b08e1ebec41903a62c2bdf5b6d8a4b
MD5 SHA1 SHA512

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PceSsFafAw.bat

Path C:\Users\Admin\AppData\Local\Temp\PceSsFafAw.bat
Size 203B
SHA256 87fd85f38bd19586a40e9a6cff92eaa88196a6553218af4c6084fe3a8ca08d65
MD5 b35dd94991defb7ada5ca9f6cde51b4a
SHA1 0815b66e1eacd3ee8124d71dcde3058555d1bd91
SHA512 12905e78dfa55ec20583aa99ee4438e8f1344fff4023e1b6f4a1864306278bace31fb7ee430f37f76a779e72311efe844ef53dd2a4895ccd958a56d7daf970af
MD5 SHA1 SHA512

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agentWeb.exe

Path \PortsurrogateRefBroker\agentWeb.exe
Size 2.3MB
SHA256 bc8457cb02515ded80d0eff126064577b39cf4acc4bb76ff49b0c20841689310
MD5 bbb13ad585691ca7a1bfcff2d84a0a93
SHA1 0b8249606fbe8c30761f7ff891b8cff760bf8766
SHA512 89042b70561185c99b876e44bf73fdaa8f205bbb05d89ab8276baea16dfb97e702d255cc18e86614b1e5b93462b11fa275898870736043a9a834d855f657ba31
SSDEEP 49152:ZpeNkzjI6lp/5xblQ94oT4mbaUpCVvUwi2FUTGWK/ZJ8PFj:3Yo/5xbGTT4J3VvRi5TGWsad
MD5 SHA1 SHA512 SSDEEP

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memory/2672-13-0x00000000010B0000-0x00000000012FE000-memory.dmp

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memory/2672-14-0x0000000000340000-0x000000000035C000-memory.dmp

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memory/2672-15-0x0000000000480000-0x0000000000496000-memory.dmp

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memory/2672-16-0x0000000000B30000-0x0000000000B86000-memory.dmp

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memory/2672-17-0x00000000001C0000-0x00000000001D2000-memory.dmp

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memory/2672-18-0x0000000000360000-0x000000000036E000-memory.dmp

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memory/2884-38-0x0000000000D50000-0x0000000000F9E000-memory.dmp

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memory/2884-39-0x0000000000480000-0x00000000004D6000-memory.dmp

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