dcrat | a606da118ccf5a95de1f1e26fa8c3e470a5758c4ec99cd212a141266cff6effb

Analysis

max time kernel
121s
max time network
122s
platform
windows7_x64
resource
win7-20240903-en
resource tags

arch:x64arch:x86image:win7-20240903-enlocale:en-usos:windows7-x64system
submitted
21-12-2024 16:35

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General

Target

a606da118ccf5a95de1f1e26fa8c3e470a5758c4ec99cd212a141266cff6effb.exe
Size

1.3MB
MD5

907674feb87ea8c1f5438eead92edb32
SHA1

6740de015a1d4208e714de592ffe334345449a11
SHA256

a606da118ccf5a95de1f1e26fa8c3e470a5758c4ec99cd212a141266cff6effb
SHA512

c18e9a7d739298663e8326fa0f025bd8e9029929b3f72e4774b0778999b6ce2e05958ddda0d9b6a9fcc7cf9517619917aafa97646701b847de52874718ae2da3
SSDEEP

24576:U2G/nvxW3Ww0t6TnzGmVBDh4+aknuRRZJND0gFJ4rD/IjC:UbA30GnzV/q+DnsXg

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
Dcrat family
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	2908	2876	schtasks.exe	34
Parent C:\Windows\system32\wbem\wmiprvse.exe is not expected to spawn this process	2916	2876	schtasks.exe	34
Parent C:\Windows\system32\wbem\wmiprvse.exe is not expected to spawn this process	2824	2876	schtasks.exe	34
Parent C:\Windows\system32\wbem\wmiprvse.exe is not expected to spawn this process	2604	2876	schtasks.exe	34
Parent C:\Windows\system32\wbem\wmiprvse.exe is not expected to spawn this process	2636	2876	schtasks.exe	34
Parent C:\Windows\system32\wbem\wmiprvse.exe is not expected to spawn this process	1552	2876	schtasks.exe	34
Parent C:\Windows\system32\wbem\wmiprvse.exe is not expected to spawn this process	2444	2876	schtasks.exe	34
Parent C:\Windows\system32\wbem\wmiprvse.exe is not expected to spawn this process	2600	2876	schtasks.exe	34
Parent C:\Windows\system32\wbem\wmiprvse.exe is not expected to spawn this process	584	2876	schtasks.exe	34

DCRat payload 2 IoCs

Detects payload of DCRat, commonly dropped by NSIS installers.

rat

resource	yara_rule
behavioral1/files/0x00080000000160d5-12.dat	dcrat
behavioral1/memory/2164-13-0x0000000000F40000-0x0000000001050000-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
1664	powershell.exe
3028	powershell.exe
2900	powershell.exe
2932	powershell.exe

Executes dropped EXE 2 IoCs

pid	Process
2164	DllCommonsvc.exe
1240	DllCommonsvc.exe

Loads dropped DLL 2 IoCs

pid	Process
2484	cmd.exe
2484	cmd.exe

Drops file in Program Files directory 2 IoCs

description	ioc	Process
File created	C:\Program Files\Reference Assemblies\Microsoft\Framework\v3.0\lsm.exe	DllCommonsvc.exe
File created	C:\Program Files\Reference Assemblies\Microsoft\Framework\v3.0\101b941d020240	DllCommonsvc.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	a606da118ccf5a95de1f1e26fa8c3e470a5758c4ec99cd212a141266cff6effb.exe
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	WScript.exe
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	cmd.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
2824	schtasks.exe
2604	schtasks.exe
2444	schtasks.exe
2908	schtasks.exe
2916	schtasks.exe
2636	schtasks.exe
1552	schtasks.exe
2600	schtasks.exe
584	schtasks.exe

Suspicious behavior: EnumeratesProcesses 5 IoCs

pid	Process
2164	DllCommonsvc.exe
2932	powershell.exe
3028	powershell.exe
2900	powershell.exe
1664	powershell.exe

Suspicious use of AdjustPrivilegeToken 6 IoCs

description	pid	Process
Token: SeDebugPrivilege	2164	DllCommonsvc.exe
Token: SeDebugPrivilege	2932	powershell.exe
Token: SeDebugPrivilege	3028	powershell.exe
Token: SeDebugPrivilege	2900	powershell.exe
Token: SeDebugPrivilege	1664	powershell.exe
Token: SeDebugPrivilege	1240	DllCommonsvc.exe

Suspicious use of WriteProcessMemory 27 IoCs

description	pid	Process	procid_target
PID 1968 wrote to memory of 2684	1968	a606da118ccf5a95de1f1e26fa8c3e470a5758c4ec99cd212a141266cff6effb.exe	30
PID 1968 wrote to memory of 2684	1968	a606da118ccf5a95de1f1e26fa8c3e470a5758c4ec99cd212a141266cff6effb.exe	30
PID 1968 wrote to memory of 2684	1968	a606da118ccf5a95de1f1e26fa8c3e470a5758c4ec99cd212a141266cff6effb.exe	30
PID 1968 wrote to memory of 2684	1968	a606da118ccf5a95de1f1e26fa8c3e470a5758c4ec99cd212a141266cff6effb.exe	30
PID 2684 wrote to memory of 2484	2684	WScript.exe	31
PID 2684 wrote to memory of 2484	2684	WScript.exe	31
PID 2684 wrote to memory of 2484	2684	WScript.exe	31
PID 2684 wrote to memory of 2484	2684	WScript.exe	31
PID 2484 wrote to memory of 2164	2484	cmd.exe	33
PID 2484 wrote to memory of 2164	2484	cmd.exe	33
PID 2484 wrote to memory of 2164	2484	cmd.exe	33
PID 2484 wrote to memory of 2164	2484	cmd.exe	33
PID 2164 wrote to memory of 1664	2164	DllCommonsvc.exe	44
PID 2164 wrote to memory of 1664	2164	DllCommonsvc.exe	44
PID 2164 wrote to memory of 1664	2164	DllCommonsvc.exe	44
PID 2164 wrote to memory of 2932	2164	DllCommonsvc.exe	45
PID 2164 wrote to memory of 2932	2164	DllCommonsvc.exe	45
PID 2164 wrote to memory of 2932	2164	DllCommonsvc.exe	45
PID 2164 wrote to memory of 2900	2164	DllCommonsvc.exe	46
PID 2164 wrote to memory of 2900	2164	DllCommonsvc.exe	46
PID 2164 wrote to memory of 2900	2164	DllCommonsvc.exe	46
PID 2164 wrote to memory of 3028	2164	DllCommonsvc.exe	47
PID 2164 wrote to memory of 3028	2164	DllCommonsvc.exe	47
PID 2164 wrote to memory of 3028	2164	DllCommonsvc.exe	47
PID 2164 wrote to memory of 1240	2164	DllCommonsvc.exe	51
PID 2164 wrote to memory of 1240	2164	DllCommonsvc.exe	51
PID 2164 wrote to memory of 1240	2164	DllCommonsvc.exe	51

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\a606da118ccf5a95de1f1e26fa8c3e470a5758c4ec99cd212a141266cff6effb.exe
"C:\Users\Admin\AppData\Local\Temp\a606da118ccf5a95de1f1e26fa8c3e470a5758c4ec99cd212a141266cff6effb.exe"
1⤵
- System Location Discovery: System Language Discovery
- Suspicious use of WriteProcessMemory
PID:1968
- C:\Windows\SysWOW64\WScript.exe
  "C:\Windows\System32\WScript.exe" "C:\providercommon\yTUdeXjbLOhnrN32dgrxVg.vbe"
  2⤵
  - System Location Discovery: System Language Discovery
  - Suspicious use of WriteProcessMemory
  PID:2684
- - C:\Windows\SysWOW64\cmd.exe
    cmd /c ""C:\providercommon\1zu9dW.bat" "
    3⤵
    - Loads dropped DLL
    - System Location Discovery: System Language Discovery
    - Suspicious use of WriteProcessMemory
    PID:2484
  - - C:\providercommon\DllCommonsvc.exe
      "C:\providercommon\DllCommonsvc.exe"
      4⤵
      Executes dropped EXE
      Drops file in Program Files directory
      Suspicious behavior: EnumeratesProcesses
      Suspicious use of AdjustPrivilegeToken
      Suspicious use of WriteProcessMemory
      PID:2164
    - - C:\Windows\System32\WindowsPowerShell\v1.0\powershell.exe
        
        "powershell" -Command Add-MpPreference -ExclusionPath 'C:\providercommon\DllCommonsvc.exe'
        5⤵
        Command and Scripting Interpreter: PowerShell
        Suspicious behavior: EnumeratesProcesses
        Suspicious use of AdjustPrivilegeToken
        
        PID:1664
    - - C:\Windows\System32\WindowsPowerShell\v1.0\powershell.exe
        
        "powershell" -Command Add-MpPreference -ExclusionPath 'C:\Users\Default\lsm.exe'
        5⤵
        Command and Scripting Interpreter: PowerShell
        Suspicious behavior: EnumeratesProcesses
        Suspicious use of AdjustPrivilegeToken
        
        PID:2932
    - - C:\Windows\System32\WindowsPowerShell\v1.0\powershell.exe
        
        "powershell" -Command Add-MpPreference -ExclusionPath 'C:\Program Files\Reference Assemblies\Microsoft\Framework\v3.0\lsm.exe'
        5⤵
        Command and Scripting Interpreter: PowerShell
        Suspicious behavior: EnumeratesProcesses
        Suspicious use of AdjustPrivilegeToken
        
        PID:2900
    - - C:\Windows\System32\WindowsPowerShell\v1.0\powershell.exe
        
        "powershell" -Command Add-MpPreference -ExclusionPath 'C:\MSOCache\All Users\{90140000-001B-0409-0000-0000000FF1CE}-C\WmiPrvSE.exe'
        5⤵
        Command and Scripting Interpreter: PowerShell
        Suspicious behavior: EnumeratesProcesses
        Suspicious use of AdjustPrivilegeToken
        
        PID:3028
    - - C:\providercommon\DllCommonsvc.exe
        
        "C:\providercommon\DllCommonsvc.exe"
        5⤵
        Executes dropped EXE
        Suspicious use of AdjustPrivilegeToken
        
        PID:1240

C:\Windows\system32\schtasks.exe
schtasks.exe /create /tn "lsml" /sc MINUTE /mo 9 /tr "'C:\Users\Default\lsm.exe'" /f
1⤵
- Process spawned unexpected child process
- Scheduled Task/Job: Scheduled Task
PID:2908

C:\Windows\system32\schtasks.exe
schtasks.exe /create /tn "lsm" /sc ONLOGON /tr "'C:\Users\Default\lsm.exe'" /rl HIGHEST /f
1⤵
- Process spawned unexpected child process
- Scheduled Task/Job: Scheduled Task
PID:2916

C:\Windows\system32\schtasks.exe
schtasks.exe /create /tn "lsml" /sc MINUTE /mo 14 /tr "'C:\Users\Default\lsm.exe'" /rl HIGHEST /f
1⤵
- Process spawned unexpected child process
- Scheduled Task/Job: Scheduled Task
PID:2824

C:\Windows\system32\schtasks.exe
schtasks.exe /create /tn "lsml" /sc MINUTE /mo 13 /tr "'C:\Program Files\Reference Assemblies\Microsoft\Framework\v3.0\lsm.exe'" /f
1⤵
- Process spawned unexpected child process
- Scheduled Task/Job: Scheduled Task
PID:2604

C:\Windows\system32\schtasks.exe
schtasks.exe /create /tn "lsm" /sc ONLOGON /tr "'C:\Program Files\Reference Assemblies\Microsoft\Framework\v3.0\lsm.exe'" /rl HIGHEST /f
1⤵
- Process spawned unexpected child process
- Scheduled Task/Job: Scheduled Task
PID:2636

C:\Windows\system32\schtasks.exe
schtasks.exe /create /tn "lsml" /sc MINUTE /mo 11 /tr "'C:\Program Files\Reference Assemblies\Microsoft\Framework\v3.0\lsm.exe'" /rl HIGHEST /f
1⤵
- Process spawned unexpected child process
- Scheduled Task/Job: Scheduled Task
PID:1552

C:\Windows\system32\schtasks.exe
schtasks.exe /create /tn "WmiPrvSEW" /sc MINUTE /mo 10 /tr "'C:\MSOCache\All Users\{90140000-001B-0409-0000-0000000FF1CE}-C\WmiPrvSE.exe'" /f
1⤵
- Process spawned unexpected child process
- Scheduled Task/Job: Scheduled Task
PID:2444

C:\Windows\system32\schtasks.exe
schtasks.exe /create /tn "WmiPrvSE" /sc ONLOGON /tr "'C:\MSOCache\All Users\{90140000-001B-0409-0000-0000000FF1CE}-C\WmiPrvSE.exe'" /rl HIGHEST /f
1⤵
- Process spawned unexpected child process
- Scheduled Task/Job: Scheduled Task
PID:2600

C:\Windows\system32\schtasks.exe
schtasks.exe /create /tn "WmiPrvSEW" /sc MINUTE /mo 5 /tr "'C:\MSOCache\All Users\{90140000-001B-0409-0000-0000000FF1CE}-C\WmiPrvSE.exe'" /rl HIGHEST /f
1⤵
- Process spawned unexpected child process
- Scheduled Task/Job: Scheduled Task
PID:584

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

C:\Users\Admin\AppData\Roaming\Microsoft\Windows\Recent\CustomDestinations\590aee7bdd69b59b.customDestinations-ms

Filesize
7KB

MD5
4509a7f30fa785579e96a1f2b6c9f9eb

SHA1
4cf63099cfdd3bd4b688c34b2773d4a7d691d7c4

SHA256
f776d0ee81cbaa2b58dd894f38e25c71b37027339a21e6afee79bed87a8f37d0

SHA512
bc807cead8299675b600bdefaff89d307b0ceb53d3e9b8c77711a9cf415a047397babee94ab0803f16c15f0961ccbc3d4a64e451771750d2752fd56deb5cf7f4

Download Submit
C:\providercommon\1zu9dW.bat

Filesize
36B

MD5
6783c3ee07c7d151ceac57f1f9c8bed7

SHA1
17468f98f95bf504cc1f83c49e49a78526b3ea03

SHA256
8ab782f0f327a2021530e7230d3aee8abbecb7eed59482a3a46e78b9e3862322

SHA512
c6012d4bfac1ed14d0fd9f0eabd0e1c3d647b343db292a907b246271d52a4b7469c809db43910ddba2e8c5045f9cb3d24d0af62d363281e6cb8b39ee94a183e8

Download Submit
C:\providercommon\DllCommonsvc.exe

Filesize
1.0MB

MD5
bd31e94b4143c4ce49c17d3af46bcad0

SHA1
f8c51ff3ff909531d9469d4ba1bbabae101853ff

SHA256
b5199d3eb28e7de8ec4a5de66cb339a03d90b297e2292473badaab98ade15c63

SHA512
f96658bd19b672fd84038bd7e95c89e14f4e6f84e3ce9c6fe3216861a41203406148c6a809c2ab350d0d6c5919c845f619deb1fc9b1f1814dfce87e566bc2394

Download Submit
C:\providercommon\yTUdeXjbLOhnrN32dgrxVg.vbe

Filesize
197B

MD5
8088241160261560a02c84025d107592

SHA1
083121f7027557570994c9fc211df61730455bb5

SHA256
2072cc9a4a3b84d4c5178ab41c5588eea7d0103e3928e34d64f17bf97f3d1cc1

SHA512
20d9369dd359315848ea30144383a0bb479d86059fdbc3b3256ac84f998193512feb3b1799ab663619920c99fe7e0ebba33ada31a3855094b956fcd351c90478

Download Submit
memory/2164-13-0x0000000000F40000-0x0000000001050000-memory.dmp

Filesize
1.1MB

Download
memory/2164-14-0x00000000003C0000-0x00000000003D2000-memory.dmp

Filesize
72KB

Download
memory/2164-15-0x00000000003D0000-0x00000000003DC000-memory.dmp

Filesize
48KB

Download
memory/2164-16-0x00000000003F0000-0x00000000003FC000-memory.dmp

Filesize
48KB

Download
memory/2164-17-0x0000000000480000-0x000000000048C000-memory.dmp

Filesize
48KB

Download
memory/2932-36-0x0000000002290000-0x0000000002298000-memory.dmp

Filesize
32KB

Download
memory/2932-34-0x000000001B6C0000-0x000000001B9A2000-memory.dmp

Filesize
2.9MB

Download