dcrat | 7224bbcf3bd6d87e1071cb7e0fb9777796401bf5dd8e8f1875ce5e21ccce8d8e

Analysis

max time kernel
128s
max time network
148s
platform
windows10-2004_x64
resource
win10v2004-20240802-en
resource tags

arch:x64arch:x86image:win10v2004-20240802-enlocale:en-usos:windows10-2004-x64system
submitted
09/08/2024, 12:41

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General

Target
679c989b6a378bab5dd436601942781f.exe
Size 1.3MB
Sample240809-pwrh1svbld
SHA256 7224bbcf3bd6d87e1071cb7e0fb9777796401bf5dd8e8f1875ce5e21ccce8d8e
MD5 679c989b6a378bab5dd436601942781f
SHA1 17f39f43225563425ca39f6aa7eaf0a3b3dc0bf1
SHA512 4141ef4a1172cd91764b9c21f9f48a828bb9e9d6c9e3ff304f426858a3730f66346045e4df279dd358b863a58b0d26fa83cddfcead823c7b01c0ca9cac11cedf
SSDEEP 24576:u2G/nvxW3WieC+QfL5ZPRnmRme/kvHsTvn7AlVNMPQiJ:ubA3j+QNdIC27AlDjI
MD5 SHA1 SHA512 SSDEEP

Score

10^/10

dcrat discovery execution 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 9 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	3068	1276	schtasks.exe	90
Parent C:\Windows\system32\wbem\wmiprvse.exe is not expected to spawn this process	992	1276	schtasks.exe	90
Parent C:\Windows\system32\wbem\wmiprvse.exe is not expected to spawn this process	3216	1276	schtasks.exe	90
Parent C:\Windows\system32\wbem\wmiprvse.exe is not expected to spawn this process	536	1276	schtasks.exe	90
Parent C:\Windows\system32\wbem\wmiprvse.exe is not expected to spawn this process	4536	1276	schtasks.exe	90
Parent C:\Windows\system32\wbem\wmiprvse.exe is not expected to spawn this process	2444	1276	schtasks.exe	90
Parent C:\Windows\system32\wbem\wmiprvse.exe is not expected to spawn this process	2880	1276	schtasks.exe	90
Parent C:\Windows\system32\wbem\wmiprvse.exe is not expected to spawn this process	4168	1276	schtasks.exe	90
Parent C:\Windows\system32\wbem\wmiprvse.exe is not expected to spawn this process	4728	1276	schtasks.exe	90

DCRat payload 2 IoCs

Detects payload of DCRat, commonly dropped by NSIS installers.

rat

resource	yara_rule
behavioral2/files/0x000800000002347c-10.dat	dcrat
behavioral2/memory/2824-13-0x0000000000E60000-0x0000000000F6C000-memory.dmp	dcrat

Command and Scripting Interpreter: PowerShell 1 TTPs 4 IoCs

Run Powershell to modify Windows Defender settings to add exclusions for file extensions, paths, and processes.

execution

PowerShell

T1059.001

pid	Process
3956	powershell.exe
644	powershell.exe
3380	powershell.exe
4904	powershell.exe

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-1-5-21-1194130065-3471212556-1656947724-1000\Control Panel\International\Geo\Nation	679c989b6a378bab5dd436601942781f.exe
Key value queried	\REGISTRY\USER\S-1-5-21-1194130065-3471212556-1656947724-1000\Control Panel\International\Geo\Nation	WScript.exe
Key value queried	\REGISTRY\USER\S-1-5-21-1194130065-3471212556-1656947724-1000\Control Panel\International\Geo\Nation	HyperproviderMonitor.exe

Executes dropped EXE 2 IoCs

pid	Process
2824	HyperproviderMonitor.exe
4900	winlogon.exe

Looks up external IP address via web service 2 IoCs

Uses a legitimate IP lookup service to find the infected system's external IP.

flow	ioc
23	ipinfo.io
24	ipinfo.io

Drops file in Program Files directory 2 IoCs

description	ioc	Process
File created	C:\Program Files (x86)\MSBuild\Microsoft\winlogon.exe	HyperproviderMonitor.exe
File created	C:\Program Files (x86)\MSBuild\Microsoft\cc11b995f2a76d	HyperproviderMonitor.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	679c989b6a378bab5dd436601942781f.exe
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	WScript.exe

Modifies registry class 1 IoCs

description	ioc	Process
Key created	\REGISTRY\USER\S-1-5-21-1194130065-3471212556-1656947724-1000_Classes\Local Settings	679c989b6a378bab5dd436601942781f.exe

Scheduled Task/Job: Scheduled Task 1 TTPs 9 IoCs

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

persistence execution

Scheduled Task

T1053.005

pid	Process
2444	schtasks.exe
2880	schtasks.exe
4168	schtasks.exe
4728	schtasks.exe
3216	schtasks.exe
992	schtasks.exe
536	schtasks.exe
4536	schtasks.exe
3068	schtasks.exe

Suspicious behavior: EnumeratesProcesses 18 IoCs

pid	Process
2824	HyperproviderMonitor.exe
3380	powershell.exe
4904	powershell.exe
3956	powershell.exe
644	powershell.exe
4900	winlogon.exe
3380	powershell.exe
4904	powershell.exe
3956	powershell.exe
644	powershell.exe
4900	winlogon.exe
4900	winlogon.exe
4900	winlogon.exe
4900	winlogon.exe
4900	winlogon.exe
4900	winlogon.exe
4900	winlogon.exe
4900	winlogon.exe

Suspicious behavior: GetForegroundWindowSpam 1 IoCs

pid	Process
4900	winlogon.exe

Suspicious use of AdjustPrivilegeToken 6 IoCs

description	pid	Process
Token: SeDebugPrivilege	2824	HyperproviderMonitor.exe
Token: SeDebugPrivilege	3380	powershell.exe
Token: SeDebugPrivilege	4904	powershell.exe
Token: SeDebugPrivilege	4900	winlogon.exe
Token: SeDebugPrivilege	3956	powershell.exe
Token: SeDebugPrivilege	644	powershell.exe

Suspicious use of WriteProcessMemory 18 IoCs

description	pid	Process	procid_target
PID 3280 wrote to memory of 2524	3280	679c989b6a378bab5dd436601942781f.exe	86
PID 3280 wrote to memory of 2524	3280	679c989b6a378bab5dd436601942781f.exe	86
PID 3280 wrote to memory of 2524	3280	679c989b6a378bab5dd436601942781f.exe	86
PID 2524 wrote to memory of 1980	2524	WScript.exe	87
PID 2524 wrote to memory of 1980	2524	WScript.exe	87
PID 2524 wrote to memory of 1980	2524	WScript.exe	87
PID 1980 wrote to memory of 2824	1980	cmd.exe	89
PID 1980 wrote to memory of 2824	1980	cmd.exe	89
PID 2824 wrote to memory of 3956	2824	HyperproviderMonitor.exe	100
PID 2824 wrote to memory of 3956	2824	HyperproviderMonitor.exe	100
PID 2824 wrote to memory of 644	2824	HyperproviderMonitor.exe	101
PID 2824 wrote to memory of 644	2824	HyperproviderMonitor.exe	101
PID 2824 wrote to memory of 3380	2824	HyperproviderMonitor.exe	102
PID 2824 wrote to memory of 3380	2824	HyperproviderMonitor.exe	102
PID 2824 wrote to memory of 4904	2824	HyperproviderMonitor.exe	103
PID 2824 wrote to memory of 4904	2824	HyperproviderMonitor.exe	103
PID 2824 wrote to memory of 4900	2824	HyperproviderMonitor.exe	107
PID 2824 wrote to memory of 4900	2824	HyperproviderMonitor.exe	107

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\679c989b6a378bab5dd436601942781f.exe
"C:\Users\Admin\AppData\Local\Temp\679c989b6a378bab5dd436601942781f.exe"
1⤵
- Checks computer location settings
- System Location Discovery: System Language Discovery
- Modifies registry class
- Suspicious use of WriteProcessMemory
PID:3280
- C:\Windows\SysWOW64\WScript.exe
  "C:\Windows\System32\WScript.exe" "C:\Users\Admin\AppData\Roaming\runtimedll\FNSj17Htppfg4k3A3UQDZrtMDVU.vbe"
  2⤵
  - Checks computer location settings
  - System Location Discovery: System Language Discovery
  - Suspicious use of WriteProcessMemory
  PID:2524
- - C:\Windows\SysWOW64\cmd.exe
    C:\Windows\system32\cmd.exe /c ""C:\Users\Admin\AppData\Roaming\runtimedll\Dys66TczvhbessmMKj4WgmTuE0u8f.bat" "
    3⤵
    - System Location Discovery: System Language Discovery
    - Suspicious use of WriteProcessMemory
    PID:1980
  - - C:\Users\Admin\AppData\Roaming\runtimedll\HyperproviderMonitor.exe
      "C:\Users\Admin\AppData\Roaming\runtimedll\HyperproviderMonitor.exe"
      4⤵
      Checks computer location settings
      Executes dropped EXE
      Drops file in Program Files directory
      Suspicious behavior: EnumeratesProcesses
      Suspicious use of AdjustPrivilegeToken
      Suspicious use of WriteProcessMemory
      PID:2824
    - - C:\Windows\System32\WindowsPowerShell\v1.0\powershell.exe
        
        "powershell" -Command Add-MpPreference -ExclusionPath 'C:\Users\Admin\AppData\Roaming\runtimedll\HyperproviderMonitor.exe'
        5⤵
        Command and Scripting Interpreter: PowerShell
        Suspicious behavior: EnumeratesProcesses
        Suspicious use of AdjustPrivilegeToken
        
        PID:3956
    - - C:\Windows\System32\WindowsPowerShell\v1.0\powershell.exe
        
        "powershell" -Command Add-MpPreference -ExclusionPath 'C:\Users\Admin\Documents\OneNote Notebooks\winlogon.exe'
        5⤵
        Command and Scripting Interpreter: PowerShell
        Suspicious behavior: EnumeratesProcesses
        Suspicious use of AdjustPrivilegeToken
        
        PID:644
    - - C:\Windows\System32\WindowsPowerShell\v1.0\powershell.exe
        
        "powershell" -Command Add-MpPreference -ExclusionPath 'C:\Users\Default User\csrss.exe'
        5⤵
        Command and Scripting Interpreter: PowerShell
        Suspicious behavior: EnumeratesProcesses
        Suspicious use of AdjustPrivilegeToken
        
        PID:3380
    - - C:\Windows\System32\WindowsPowerShell\v1.0\powershell.exe
        
        "powershell" -Command Add-MpPreference -ExclusionPath 'C:\Program Files (x86)\MSBuild\Microsoft\winlogon.exe'
        5⤵
        Command and Scripting Interpreter: PowerShell
        Suspicious behavior: EnumeratesProcesses
        Suspicious use of AdjustPrivilegeToken
        
        PID:4904
    - - C:\Program Files (x86)\MSBuild\Microsoft\winlogon.exe
        
        "C:\Program Files (x86)\MSBuild\Microsoft\winlogon.exe"
        5⤵
        Executes dropped EXE
        Suspicious behavior: EnumeratesProcesses
        Suspicious behavior: GetForegroundWindowSpam
        Suspicious use of AdjustPrivilegeToken
        
        PID:4900

C:\Windows\system32\schtasks.exe
schtasks.exe /create /tn "winlogonw" /sc MINUTE /mo 5 /tr "'C:\Users\Admin\Documents\OneNote Notebooks\winlogon.exe'" /f
1⤵
- Process spawned unexpected child process
- Scheduled Task/Job: Scheduled Task
PID:3068

C:\Windows\system32\schtasks.exe
schtasks.exe /create /tn "winlogon" /sc ONLOGON /tr "'C:\Users\Admin\Documents\OneNote Notebooks\winlogon.exe'" /rl HIGHEST /f
1⤵
- Process spawned unexpected child process
- Scheduled Task/Job: Scheduled Task
PID:992

C:\Windows\system32\schtasks.exe
schtasks.exe /create /tn "winlogonw" /sc MINUTE /mo 9 /tr "'C:\Users\Admin\Documents\OneNote Notebooks\winlogon.exe'" /rl HIGHEST /f
1⤵
- Process spawned unexpected child process
- Scheduled Task/Job: Scheduled Task
PID:3216

C:\Windows\system32\schtasks.exe
schtasks.exe /create /tn "csrssc" /sc MINUTE /mo 12 /tr "'C:\Users\Default User\csrss.exe'" /f
1⤵
- Process spawned unexpected child process
- Scheduled Task/Job: Scheduled Task
PID:536

C:\Windows\system32\schtasks.exe
schtasks.exe /create /tn "csrss" /sc ONLOGON /tr "'C:\Users\Default User\csrss.exe'" /rl HIGHEST /f
1⤵
- Process spawned unexpected child process
- Scheduled Task/Job: Scheduled Task
PID:4536

C:\Windows\system32\schtasks.exe
schtasks.exe /create /tn "csrssc" /sc MINUTE /mo 12 /tr "'C:\Users\Default User\csrss.exe'" /rl HIGHEST /f
1⤵
- Process spawned unexpected child process
- Scheduled Task/Job: Scheduled Task
PID:2444

C:\Windows\system32\schtasks.exe
schtasks.exe /create /tn "winlogonw" /sc MINUTE /mo 12 /tr "'C:\Program Files (x86)\MSBuild\Microsoft\winlogon.exe'" /f
1⤵
- Process spawned unexpected child process
- Scheduled Task/Job: Scheduled Task
PID:2880

C:\Windows\system32\schtasks.exe
schtasks.exe /create /tn "winlogon" /sc ONLOGON /tr "'C:\Program Files (x86)\MSBuild\Microsoft\winlogon.exe'" /rl HIGHEST /f
1⤵
- Process spawned unexpected child process
- Scheduled Task/Job: Scheduled Task
PID:4168

C:\Windows\system32\schtasks.exe
schtasks.exe /create /tn "winlogonw" /sc MINUTE /mo 8 /tr "'C:\Program Files (x86)\MSBuild\Microsoft\winlogon.exe'" /rl HIGHEST /f
1⤵
- Process spawned unexpected child process
- Scheduled Task/Job: Scheduled Task
PID:4728

Network

MITRE ATT&CK Enterprise v15

Reconnaissance

Resource Development

Initial Access

Execution

Command and Scripting Interpreter

T1059

PowerShell

T1059.001

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

powershell.exe.log

Path C:\Users\Admin\AppData\Local\Microsoft\CLR_v4.0\UsageLogs\powershell.exe.log
Size 2KB
SHA256 84739c608a73509419748e4e20e6cc4e1846056c3fe1929a8300d5a1a488202f
MD5 d85ba6ff808d9e5444a4b369f5bc2730
SHA1 31aa9d96590fff6981b315e0b391b575e4c0804a
SHA512 8c414eb55b45212af385accc16d9d562adba2123583ce70d22b91161fe878683845512a78f04dedd4ea98ed9b174dbfa98cf696370598ad8e6fbd1e714f1f249
MD5 SHA1 SHA512

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StartupProfileData-NonInteractive

Path C:\Users\Admin\AppData\Local\Microsoft\Windows\PowerShell\StartupProfileData-NonInteractive
Size 944B
SHA256 2360634e63e8f0b5748e2c56ebb8f4aa78e71008ea7b5c9ca1c49be03b49557d
MD5 6d3e9c29fe44e90aae6ed30ccf799ca8
SHA1 c7974ef72264bbdf13a2793ccf1aed11bc565dce
SHA512 60c38c4367352537545d859f64b9c5cbada94240478d1d039fd27b5ecba4dc1c90051557c16d802269703b873546ead416279c0a80c6fd5e49ad361cef22596a
MD5 SHA1 SHA512

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__PSScriptPolicyTest_mvjvctau.zbc.ps1

Path C:\Users\Admin\AppData\Local\Temp\__PSScriptPolicyTest_mvjvctau.zbc.ps1
Size 60B
SHA256 96ad1146eb96877eab5942ae0736b82d8b5e2039a80d3d6932665c1a4c87dcf7
MD5 d17fe0a3f47be24a6453e9ef58c94641
SHA1 6ab83620379fc69f80c0242105ddffd7d98d5d9d
SHA512 5b592e58f26c264604f98f6aa12860758ce606d1c63220736cf0c779e4e18e3cec8706930a16c38b20161754d1017d1657d35258e58ca22b18f5b232880dec82
MD5 SHA1 SHA512

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Dys66TczvhbessmMKj4WgmTuE0u8f.bat

Path C:\Users\Admin\AppData\Roaming\runtimedll\Dys66TczvhbessmMKj4WgmTuE0u8f.bat
Size 47B
SHA256 72aba57196684dc7756227e66e0fd8378ce1d3c48ce9a184b7e9eee9d6b7b06c
MD5 fe35c0364f013c7be13f2ec9e5e830ea
SHA1 123641b5e4e0acad712cf1ecf96901b096de6eec
SHA512 2bebd7748a85addb9d306f2a4efb0eddec9937d962a184f1d2c3f0b95be6b6f1cbb3c929c87b8aef8ebd68491c47300e077f2ce6655b1ab6088e9c585fce56f1
MD5 SHA1 SHA512

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FNSj17Htppfg4k3A3UQDZrtMDVU.vbe

Path C:\Users\Admin\AppData\Roaming\runtimedll\FNSj17Htppfg4k3A3UQDZrtMDVU.vbe
Size 223B
SHA256 f1e741139e2938057c910a6968964cc706305e31d95bfbe8c671262ce453da73
MD5 91263a6cae8942e91793ad357fb699f9
SHA1 88e4284e8ffd462fc9e1034bbc403f85511734b7
SHA512 0d549433d4a6abb3ae88fab5bf9b7380d9069e9e7104004a85a41b7c62631c3e3aad830741fe023c46cd1a8b6340d32fbc5deffaf26f222e091b92c04d852df7
MD5 SHA1 SHA512

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HyperproviderMonitor.exe

Path C:\Users\Admin\AppData\Roaming\runtimedll\HyperproviderMonitor.exe
Size 1.0MB
SHA256 8a1d1d82a7627a27fda435c8e47bb1a4549a8503244d63dd0d6e5a65c19ec42c
MD5 35260f3ab90b954c6b95aa7a2565ccd3
SHA1 91fa67458c55524fd9659662b348794fb6bb08b3
SHA512 15275993095c40b67b502a8153995f1285a6f23046f68aea5799680736c344c4622e67be80d9db015ef54d1dd6ee5b5e94d1f32bc497b94ba5888a26eae225f0
SSDEEP 12288:zXga/mLwgZPRnmbqGn2XNnIIyloyH6NBPNF7TsT6mnplK4YTvblVNMPsUmVk:zQfL5ZPRnmRme/kvHsTvn7AlVNMPQi
MD5 SHA1 SHA512 SSDEEP

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memory/2824-13-0x0000000000E60000-0x0000000000F6C000-memory.dmp

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memory/2824-15-0x00000000018D0000-0x00000000018D8000-memory.dmp

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memory/2824-17-0x0000000001910000-0x000000000191E000-memory.dmp

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memory/2824-18-0x00000000018F0000-0x00000000018FC000-memory.dmp

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memory/2824-16-0x00000000018E0000-0x00000000018F2000-memory.dmp

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memory/2824-14-0x00000000018C0000-0x00000000018C8000-memory.dmp

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memory/2824-12-0x00007FFD8BE43000-0x00007FFD8BE45000-memory.dmp

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memory/4900-82-0x000000001C910000-0x000000001CAD2000-memory.dmp

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memory/4900-83-0x000000001D410000-0x000000001D938000-memory.dmp

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memory/4904-43-0x0000016E48320000-0x0000016E48342000-memory.dmp

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