dcrat | 46f77240e4a469bf38e0600e95edf6de249ede13f5a41de3702af584a69b7761

General

Target

BAE83C597A9F76E1A42B833F108C8C9A.exe
Size

1.1MB
MD5

bae83c597a9f76e1a42b833f108c8c9a
SHA1

c0be6ab84266d366d22b28c5bc0d68f2be525fc1
SHA256

46f77240e4a469bf38e0600e95edf6de249ede13f5a41de3702af584a69b7761
SHA512

0b72794bc1d6ce47406a7fc4a12b1a0107633882cb06387f6abe9ef6480a93381bed71ac254e8bfdfa434b65f04419136e4ff992346f420f289075c48484715e
SSDEEP

24576:K2G/nvxW3WHKfhIVMjZs1LtHoFJS32TpfXVH:KbA3xZ0Mj6g3

Score

10^/10

dcrat discovery evasion 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 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	2360	2168	schtasks.exe	87
Parent C:\Windows\system32\wbem\wmiprvse.exe is not expected to spawn this process	3788	2168	schtasks.exe	87
Parent C:\Windows\system32\wbem\wmiprvse.exe is not expected to spawn this process	1364	2168	schtasks.exe	87
Parent C:\Windows\system32\wbem\wmiprvse.exe is not expected to spawn this process	1744	2168	schtasks.exe	87
Parent C:\Windows\system32\wbem\wmiprvse.exe is not expected to spawn this process	2644	2168	schtasks.exe	87
Parent C:\Windows\system32\wbem\wmiprvse.exe is not expected to spawn this process	1492	2168	schtasks.exe	87
Parent C:\Windows\system32\wbem\wmiprvse.exe is not expected to spawn this process	460	2168	schtasks.exe	87
Parent C:\Windows\system32\wbem\wmiprvse.exe is not expected to spawn this process	4608	2168	schtasks.exe	87
Parent C:\Windows\system32\wbem\wmiprvse.exe is not expected to spawn this process	2924	2168	schtasks.exe	87
Parent C:\Windows\system32\wbem\wmiprvse.exe is not expected to spawn this process	4572	2168	schtasks.exe	87
Parent C:\Windows\system32\wbem\wmiprvse.exe is not expected to spawn this process	3276	2168	schtasks.exe	87
Parent C:\Windows\system32\wbem\wmiprvse.exe is not expected to spawn this process	1636	2168	schtasks.exe	87
Parent C:\Windows\system32\wbem\wmiprvse.exe is not expected to spawn this process	3252	2168	schtasks.exe	87
Parent C:\Windows\system32\wbem\wmiprvse.exe is not expected to spawn this process	2180	2168	schtasks.exe	87
Parent C:\Windows\system32\wbem\wmiprvse.exe is not expected to spawn this process	4092	2168	schtasks.exe	87
Parent C:\Windows\system32\wbem\wmiprvse.exe is not expected to spawn this process	4560	2168	schtasks.exe	87
Parent C:\Windows\system32\wbem\wmiprvse.exe is not expected to spawn this process	4120	2168	schtasks.exe	87
Parent C:\Windows\system32\wbem\wmiprvse.exe is not expected to spawn this process	2552	2168	schtasks.exe	87

DCRat payload 2 IoCs

Detects payload of DCRat, commonly dropped by NSIS installers.

rat

resource	yara_rule
behavioral2/files/0x0007000000023c68-10.dat	dcrat
behavioral2/memory/920-13-0x00000000005E0000-0x00000000006B6000-memory.dmp	dcrat

Disables Task Manager via registry modification
evasion

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-1-5-21-2878641211-696417878-3864914810-1000\Control Panel\International\Geo\Nation	BAE83C597A9F76E1A42B833F108C8C9A.exe
Key value queried	\REGISTRY\USER\S-1-5-21-2878641211-696417878-3864914810-1000\Control Panel\International\Geo\Nation	WScript.exe
Key value queried	\REGISTRY\USER\S-1-5-21-2878641211-696417878-3864914810-1000\Control Panel\International\Geo\Nation	blockweb.exe

Executes dropped EXE 2 IoCs

pid	Process
920	blockweb.exe
3588	lsass.exe

Drops file in Program Files directory 5 IoCs

description	ioc	Process
File created	C:\Program Files\ModifiableWindowsApps\backgroundTaskHost.exe	blockweb.exe
File created	C:\Program Files (x86)\MSBuild\Microsoft\Windows Workflow Foundation\v3.0\Registry.exe	blockweb.exe
File created	C:\Program Files (x86)\MSBuild\Microsoft\Windows Workflow Foundation\v3.0\ee2ad38f3d4382	blockweb.exe
File created	C:\Program Files (x86)\MSBuild\Microsoft\Windows Workflow Foundation\lsass.exe	blockweb.exe
File created	C:\Program Files (x86)\MSBuild\Microsoft\Windows Workflow Foundation\6203df4a6bafc7	blockweb.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 4 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	BAE83C597A9F76E1A42B833F108C8C9A.exe
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	reg.exe

Modifies registry class 2 IoCs

description	ioc	Process
Key created	\REGISTRY\USER\S-1-5-21-2878641211-696417878-3864914810-1000_Classes\Local Settings	BAE83C597A9F76E1A42B833F108C8C9A.exe
Key created	\REGISTRY\USER\S-1-5-21-2878641211-696417878-3864914810-1000_Classes\Local Settings	blockweb.exe

Modifies registry key 1 TTPs 1 IoCs

Modify Registry

T1112

pid	Process
2036	reg.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
1492	schtasks.exe
1636	schtasks.exe
4560	schtasks.exe
3276	schtasks.exe
4608	schtasks.exe
2180	schtasks.exe
4092	schtasks.exe
3788	schtasks.exe
1364	schtasks.exe
1744	schtasks.exe
2644	schtasks.exe
3252	schtasks.exe
4120	schtasks.exe
2552	schtasks.exe
2360	schtasks.exe
460	schtasks.exe
2924	schtasks.exe
4572	schtasks.exe

Suspicious behavior: EnumeratesProcesses 4 IoCs

pid	Process
920	blockweb.exe
920	blockweb.exe
920	blockweb.exe
3588	lsass.exe

Suspicious use of AdjustPrivilegeToken 2 IoCs

description	pid	Process
Token: SeDebugPrivilege	920	blockweb.exe
Token: SeDebugPrivilege	3588	lsass.exe

Suspicious use of WriteProcessMemory 17 IoCs

description	pid	Process	procid_target
PID 3672 wrote to memory of 3044	3672	BAE83C597A9F76E1A42B833F108C8C9A.exe	83
PID 3672 wrote to memory of 3044	3672	BAE83C597A9F76E1A42B833F108C8C9A.exe	83
PID 3672 wrote to memory of 3044	3672	BAE83C597A9F76E1A42B833F108C8C9A.exe	83
PID 3044 wrote to memory of 4796	3044	WScript.exe	84
PID 3044 wrote to memory of 4796	3044	WScript.exe	84
PID 3044 wrote to memory of 4796	3044	WScript.exe	84
PID 4796 wrote to memory of 920	4796	cmd.exe	86
PID 4796 wrote to memory of 920	4796	cmd.exe	86
PID 920 wrote to memory of 3620	920	blockweb.exe	106
PID 920 wrote to memory of 3620	920	blockweb.exe	106
PID 4796 wrote to memory of 2036	4796	cmd.exe	108
PID 4796 wrote to memory of 2036	4796	cmd.exe	108
PID 4796 wrote to memory of 2036	4796	cmd.exe	108
PID 3620 wrote to memory of 2712	3620	cmd.exe	109
PID 3620 wrote to memory of 2712	3620	cmd.exe	109
PID 3620 wrote to memory of 3588	3620	cmd.exe	115
PID 3620 wrote to memory of 3588	3620	cmd.exe	115

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\BAE83C597A9F76E1A42B833F108C8C9A.exe
"C:\Users\Admin\AppData\Local\Temp\BAE83C597A9F76E1A42B833F108C8C9A.exe"
1⤵
- Checks computer location settings
- System Location Discovery: System Language Discovery
- Modifies registry class
- Suspicious use of WriteProcessMemory
PID:3672
- C:\Windows\SysWOW64\WScript.exe
  "C:\Windows\System32\WScript.exe" "C:\ServerBrokerperf\PsCiFwPs5yLlLF7yRNDHfRA.vbe"
  2⤵
  - Checks computer location settings
  - System Location Discovery: System Language Discovery
  - Suspicious use of WriteProcessMemory
  PID:3044
- - C:\Windows\SysWOW64\cmd.exe
    C:\Windows\system32\cmd.exe /c ""C:\ServerBrokerperf\yZmK36IDpKQLRFj1psdgPwkClrgJN.bat" "
    3⤵
    - System Location Discovery: System Language Discovery
    - Suspicious use of WriteProcessMemory
    PID:4796
  - - C:\ServerBrokerperf\blockweb.exe
      "C:\ServerBrokerperf\blockweb.exe"
      4⤵
      Checks computer location settings
      Executes dropped EXE
      Drops file in Program Files directory
      Modifies registry class
      Suspicious behavior: EnumeratesProcesses
      Suspicious use of AdjustPrivilegeToken
      Suspicious use of WriteProcessMemory
      PID:920
    - - C:\Windows\System32\cmd.exe
        
        "C:\Windows\System32\cmd.exe" /C "C:\Users\Admin\AppData\Local\Temp\yqwMa95SGU.bat"
        5⤵
        Suspicious use of WriteProcessMemory
        
        PID:3620
      - C:\Windows\system32\w32tm.exe
        
        w32tm /stripchart /computer:localhost /period:5 /dataonly /samples:2
        6⤵
        
        PID:2712
      - C:\Program Files (x86)\MSBuild\Microsoft\Windows Workflow Foundation\lsass.exe
        
        "C:\Program Files (x86)\MSBuild\Microsoft\Windows Workflow Foundation\lsass.exe"
        6⤵
        Executes dropped EXE
        Suspicious behavior: EnumeratesProcesses
        Suspicious use of AdjustPrivilegeToken
        
        PID:3588
  - - C:\Windows\SysWOW64\reg.exe
      reg add HKCU\Software\Microsoft\Windows\CurrentVersion\Policies\System /v DisableTaskMgr /t REG_DWORD /d 1 /f
      4⤵
      System Location Discovery: System Language Discovery
      Modifies registry key
      PID:2036

C:\Windows\system32\schtasks.exe
schtasks.exe /create /tn "servicess" /sc MINUTE /mo 8 /tr "'C:\ServerBrokerperf\services.exe'" /f
1⤵
- Process spawned unexpected child process
- Scheduled Task/Job: Scheduled Task
PID:2360

C:\Windows\system32\schtasks.exe
schtasks.exe /create /tn "services" /sc ONLOGON /tr "'C:\ServerBrokerperf\services.exe'" /rl HIGHEST /f
1⤵
- Process spawned unexpected child process
- Scheduled Task/Job: Scheduled Task
PID:3788

C:\Windows\system32\schtasks.exe
schtasks.exe /create /tn "servicess" /sc MINUTE /mo 11 /tr "'C:\ServerBrokerperf\services.exe'" /rl HIGHEST /f
1⤵
- Process spawned unexpected child process
- Scheduled Task/Job: Scheduled Task
PID:1364

C:\Windows\system32\schtasks.exe
schtasks.exe /create /tn "sihosts" /sc MINUTE /mo 5 /tr "'C:\ServerBrokerperf\sihost.exe'" /f
1⤵
- Process spawned unexpected child process
- Scheduled Task/Job: Scheduled Task
PID:1744

C:\Windows\system32\schtasks.exe
schtasks.exe /create /tn "sihost" /sc ONLOGON /tr "'C:\ServerBrokerperf\sihost.exe'" /rl HIGHEST /f
1⤵
- Process spawned unexpected child process
- Scheduled Task/Job: Scheduled Task
PID:2644

C:\Windows\system32\schtasks.exe
schtasks.exe /create /tn "sihosts" /sc MINUTE /mo 8 /tr "'C:\ServerBrokerperf\sihost.exe'" /rl HIGHEST /f
1⤵
- Process spawned unexpected child process
- Scheduled Task/Job: Scheduled Task
PID:1492

C:\Windows\system32\schtasks.exe
schtasks.exe /create /tn "lsassl" /sc MINUTE /mo 11 /tr "'C:\Program Files (x86)\MSBuild\Microsoft\Windows Workflow Foundation\lsass.exe'" /f
1⤵
- Process spawned unexpected child process
- Scheduled Task/Job: Scheduled Task
PID:460

C:\Windows\system32\schtasks.exe
schtasks.exe /create /tn "lsass" /sc ONLOGON /tr "'C:\Program Files (x86)\MSBuild\Microsoft\Windows Workflow Foundation\lsass.exe'" /rl HIGHEST /f
1⤵
- Process spawned unexpected child process
- Scheduled Task/Job: Scheduled Task
PID:4608

C:\Windows\system32\schtasks.exe
schtasks.exe /create /tn "lsassl" /sc MINUTE /mo 12 /tr "'C:\Program Files (x86)\MSBuild\Microsoft\Windows Workflow Foundation\lsass.exe'" /rl HIGHEST /f
1⤵
- Process spawned unexpected child process
- Scheduled Task/Job: Scheduled Task
PID:2924

C:\Windows\system32\schtasks.exe
schtasks.exe /create /tn "lsassl" /sc MINUTE /mo 13 /tr "'C:\ServerBrokerperf\lsass.exe'" /f
1⤵
- Process spawned unexpected child process
- Scheduled Task/Job: Scheduled Task
PID:4572

C:\Windows\system32\schtasks.exe
schtasks.exe /create /tn "lsass" /sc ONLOGON /tr "'C:\ServerBrokerperf\lsass.exe'" /rl HIGHEST /f
1⤵
- Process spawned unexpected child process
- Scheduled Task/Job: Scheduled Task
PID:3276

C:\Windows\system32\schtasks.exe
schtasks.exe /create /tn "lsassl" /sc MINUTE /mo 5 /tr "'C:\ServerBrokerperf\lsass.exe'" /rl HIGHEST /f
1⤵
- Process spawned unexpected child process
- Scheduled Task/Job: Scheduled Task
PID:1636

C:\Windows\system32\schtasks.exe
schtasks.exe /create /tn "RegistryR" /sc MINUTE /mo 13 /tr "'C:\Program Files (x86)\MSBuild\Microsoft\Windows Workflow Foundation\v3.0\Registry.exe'" /f
1⤵
- Process spawned unexpected child process
- Scheduled Task/Job: Scheduled Task
PID:3252

C:\Windows\system32\schtasks.exe
schtasks.exe /create /tn "Registry" /sc ONLOGON /tr "'C:\Program Files (x86)\MSBuild\Microsoft\Windows Workflow Foundation\v3.0\Registry.exe'" /rl HIGHEST /f
1⤵
- Process spawned unexpected child process
- Scheduled Task/Job: Scheduled Task
PID:2180

C:\Windows\system32\schtasks.exe
schtasks.exe /create /tn "RegistryR" /sc MINUTE /mo 6 /tr "'C:\Program Files (x86)\MSBuild\Microsoft\Windows Workflow Foundation\v3.0\Registry.exe'" /rl HIGHEST /f
1⤵
- Process spawned unexpected child process
- Scheduled Task/Job: Scheduled Task
PID:4092

C:\Windows\system32\schtasks.exe
schtasks.exe /create /tn "OfficeClickToRunO" /sc MINUTE /mo 14 /tr "'C:\Recovery\WindowsRE\OfficeClickToRun.exe'" /f
1⤵
- Process spawned unexpected child process
- Scheduled Task/Job: Scheduled Task
PID:4560

C:\Windows\system32\schtasks.exe
schtasks.exe /create /tn "OfficeClickToRun" /sc ONLOGON /tr "'C:\Recovery\WindowsRE\OfficeClickToRun.exe'" /rl HIGHEST /f
1⤵
- Process spawned unexpected child process
- Scheduled Task/Job: Scheduled Task
PID:4120

C:\Windows\system32\schtasks.exe
schtasks.exe /create /tn "OfficeClickToRunO" /sc MINUTE /mo 14 /tr "'C:\Recovery\WindowsRE\OfficeClickToRun.exe'" /rl HIGHEST /f
1⤵
- Process spawned unexpected child process
- Scheduled Task/Job: Scheduled Task
PID:2552

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

Modify Registry

1

T1112

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

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Downloads

C:\ServerBrokerperf\PsCiFwPs5yLlLF7yRNDHfRA.vbe

Filesize
222B

MD5
e0e59f3a0ad8f6fc6107daf9f5ea2298

SHA1
3d8c5af544fb8e00a9aef7ceb6e861d34842aa67

SHA256
7be9d4ddae790ad15f1fa1ec2f42c22becbf3c53b3f88e77f87dc2d7e86e2370

SHA512
21aab8c94d0c6c473c472eeb779810fcf7520fb6249bc6db6945fdf1d03fabc00f9889d744f9b8593cdb1c44a62c69f738d1a13a55ef2bd3b33a7ffeed333639

Download Submit
C:\ServerBrokerperf\blockweb.exe

Filesize
827KB

MD5
7405cb828a4d484032c1507b1780f464

SHA1
dfd41854c4ac381431516ec27d12a1535acabb3a

SHA256
53404151c9e675018976662123f67680a45b91dd533788501ba2777d0cc932ba

SHA512
1439c2204c7aea94514b5d7be5c0d9a7cc2aefc6904eceabb7c616466fd99cc79af0e99a21ca4180da2025dbc2ec8edf682e687d3074db9609d284eb965c39a3

Download Submit
C:\ServerBrokerperf\yZmK36IDpKQLRFj1psdgPwkClrgJN.bat

Filesize
146B

MD5
73f4bc9864b7eb9026937170a277b68e

SHA1
afec9c4c687c356a4114e282e7f188454911fbe5

SHA256
65d9d5d04a37d38026be224b5b6e70941e58d62acd86d177408f7dd041e11ad4

SHA512
b63b0700313f581ef56789a811023c9b7ad63aa52d16a8322cd53c82792208b9fb4caf5f3d9118542d96c18ef47cc6aab56f84c99c62e40c1309c48b81110b03

Download Submit
C:\Users\Admin\AppData\Local\Temp\yqwMa95SGU.bat

Filesize
243B

MD5
7a9a64b23264532ae90ff9833eca2f90

SHA1
c48232550a06110ed084470b95b775310649c3ae

SHA256
2aeda770fa8149a340eba8aa67ebd3c2198e9f322aca7c512a7d227833c6ed79

SHA512
09a4f1ca6c34771026a5b0dd804f690d1798b92ea31079b77381af90e29044160f91c74f866756e8395c26a962b7489a2b9be736ef72254195998741a7ad2331

Download Submit
memory/920-12-0x00007FFAC1EA3000-0x00007FFAC1EA5000-memory.dmp

Filesize
8KB

Download
memory/920-13-0x00000000005E0000-0x00000000006B6000-memory.dmp

Filesize
856KB

Download

Analysis

Sharing

General

Malware Config

Signatures

Processes

Network

MITRE ATT&CK Enterprise v15

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Downloads