dcrat | b92b26104f6813dbaccc15c7595e2cfb3f25a4206aa1b7957bbeac03d5958ef8

General

Target

blum.exe
Size

1.1MB
MD5

a1d4782417480660db2ba6a327755b76
SHA1

ec3e6ab4b58ba02e47a187dbfa404a187140b3a3
SHA256

b92b26104f6813dbaccc15c7595e2cfb3f25a4206aa1b7957bbeac03d5958ef8
SHA512

50812782ea2fb0a5de109f6e9e5b64a8c6b2ff1102f573f63e75f42274075ab4c8999cf0a62d8ea7f73ee190fbedc2881380d77c4b56de2cd1f029939822461d
SSDEEP

24576:U2G/nvxW3Ww0tqoBuQ+I5p5qpLhu33BWwXqto:UbA30TYQ+8qpNWRDq2

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 12 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	2780	2796	schtasks.exe	34
Parent C:\Windows\system32\wbem\wmiprvse.exe is not expected to spawn this process	2288	2796	schtasks.exe	34
Parent C:\Windows\system32\wbem\wmiprvse.exe is not expected to spawn this process	3040	2796	schtasks.exe	34
Parent C:\Windows\system32\wbem\wmiprvse.exe is not expected to spawn this process	2712	2796	schtasks.exe	34
Parent C:\Windows\system32\wbem\wmiprvse.exe is not expected to spawn this process	2668	2796	schtasks.exe	34
Parent C:\Windows\system32\wbem\wmiprvse.exe is not expected to spawn this process	2708	2796	schtasks.exe	34
Parent C:\Windows\system32\wbem\wmiprvse.exe is not expected to spawn this process	2508	2796	schtasks.exe	34
Parent C:\Windows\system32\wbem\wmiprvse.exe is not expected to spawn this process	1392	2796	schtasks.exe	34
Parent C:\Windows\system32\wbem\wmiprvse.exe is not expected to spawn this process	336	2796	schtasks.exe	34
Parent C:\Windows\system32\wbem\wmiprvse.exe is not expected to spawn this process	616	2796	schtasks.exe	34
Parent C:\Windows\system32\wbem\wmiprvse.exe is not expected to spawn this process	1752	2796	schtasks.exe	34
Parent C:\Windows\system32\wbem\wmiprvse.exe is not expected to spawn this process	2964	2796	schtasks.exe	34

DCRat payload 3 IoCs

Detects payload of DCRat, commonly dropped by NSIS installers.

rat

resource	yara_rule
behavioral1/files/0x0008000000015d79-12.dat	dcrat
behavioral1/memory/2552-13-0x0000000000E00000-0x0000000000ED6000-memory.dmp	dcrat
behavioral1/memory/1000-28-0x00000000003E0000-0x00000000004B6000-memory.dmp	dcrat

Disables Task Manager via registry modification
evasion

Executes dropped EXE 2 IoCs

pid	Process
2552	WebReview.exe
1000	explorer.exe

Loads dropped DLL 2 IoCs

pid	Process
2112	cmd.exe
2112	cmd.exe

Drops file in Program Files directory 2 IoCs

description	ioc	Process
File created	C:\Program Files\Windows Photo Viewer\it-IT\cmd.exe	WebReview.exe
File created	C:\Program Files\Windows Photo Viewer\it-IT\ebf1f9fa8afd6d	WebReview.exe

Drops file in Windows directory 3 IoCs

description	ioc	Process
File created	C:\Windows\AppPatch\AppPatch64\csrss.exe	WebReview.exe
File opened for modification	C:\Windows\AppPatch\AppPatch64\csrss.exe	WebReview.exe
File created	C:\Windows\AppPatch\AppPatch64\886983d96e3d3e	WebReview.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	blum.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 key 1 TTPs 1 IoCs

Modify Registry

T1112

pid	Process
2332	reg.exe

Scheduled Task/Job: Scheduled Task 1 TTPs 12 IoCs

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

persistence execution

Scheduled Task

T1053.005

pid	Process
2668	schtasks.exe
2508	schtasks.exe
1392	schtasks.exe
336	schtasks.exe
2780	schtasks.exe
3040	schtasks.exe
2712	schtasks.exe
1752	schtasks.exe
2964	schtasks.exe
2288	schtasks.exe
2708	schtasks.exe
616	schtasks.exe

Suspicious behavior: EnumeratesProcesses 10 IoCs

pid	Process
2552	WebReview.exe
1000	explorer.exe
1000	explorer.exe
1000	explorer.exe
1000	explorer.exe
1000	explorer.exe
1000	explorer.exe
1000	explorer.exe
1000	explorer.exe
1000	explorer.exe

Suspicious behavior: GetForegroundWindowSpam 1 IoCs

pid	Process
1000	explorer.exe

Suspicious use of AdjustPrivilegeToken 2 IoCs

description	pid	Process
Token: SeDebugPrivilege	2552	WebReview.exe
Token: SeDebugPrivilege	1000	explorer.exe

Suspicious use of WriteProcessMemory 19 IoCs

description	pid	Process	procid_target
PID 1736 wrote to memory of 2308	1736	blum.exe	30
PID 1736 wrote to memory of 2308	1736	blum.exe	30
PID 1736 wrote to memory of 2308	1736	blum.exe	30
PID 1736 wrote to memory of 2308	1736	blum.exe	30
PID 2308 wrote to memory of 2112	2308	WScript.exe	31
PID 2308 wrote to memory of 2112	2308	WScript.exe	31
PID 2308 wrote to memory of 2112	2308	WScript.exe	31
PID 2308 wrote to memory of 2112	2308	WScript.exe	31
PID 2112 wrote to memory of 2552	2112	cmd.exe	33
PID 2112 wrote to memory of 2552	2112	cmd.exe	33
PID 2112 wrote to memory of 2552	2112	cmd.exe	33
PID 2112 wrote to memory of 2552	2112	cmd.exe	33
PID 2552 wrote to memory of 1000	2552	WebReview.exe	47
PID 2552 wrote to memory of 1000	2552	WebReview.exe	47
PID 2552 wrote to memory of 1000	2552	WebReview.exe	47
PID 2112 wrote to memory of 2332	2112	cmd.exe	48
PID 2112 wrote to memory of 2332	2112	cmd.exe	48
PID 2112 wrote to memory of 2332	2112	cmd.exe	48
PID 2112 wrote to memory of 2332	2112	cmd.exe	48

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\blum.exe
"C:\Users\Admin\AppData\Local\Temp\blum.exe"
1⤵
- System Location Discovery: System Language Discovery
- Suspicious use of WriteProcessMemory
PID:1736
- C:\Windows\SysWOW64\WScript.exe
  "C:\Windows\System32\WScript.exe" "C:\msServercomponentweb\LnKd9V5Ane60N.vbe"
  2⤵
  - System Location Discovery: System Language Discovery
  - Suspicious use of WriteProcessMemory
  PID:2308
- - C:\Windows\SysWOW64\cmd.exe
    cmd /c ""C:\msServercomponentweb\A6MW0Y9mrWWMXc6x0fq3HB4apg3.bat" "
    3⤵
    - Loads dropped DLL
    - System Location Discovery: System Language Discovery
    - Suspicious use of WriteProcessMemory
    PID:2112
  - - C:\msServercomponentweb\WebReview.exe
      "C:\msServercomponentweb\WebReview.exe"
      4⤵
      Executes dropped EXE
      Drops file in Program Files directory
      Drops file in Windows directory
      Suspicious behavior: EnumeratesProcesses
      Suspicious use of AdjustPrivilegeToken
      Suspicious use of WriteProcessMemory
      PID:2552
    - - C:\MSOCache\All Users\{90140000-002C-0409-0000-0000000FF1CE}-C\Proof.fr\explorer.exe
        
        "C:\MSOCache\All Users\{90140000-002C-0409-0000-0000000FF1CE}-C\Proof.fr\explorer.exe"
        5⤵
        Executes dropped EXE
        Suspicious behavior: EnumeratesProcesses
        Suspicious behavior: GetForegroundWindowSpam
        Suspicious use of AdjustPrivilegeToken
        
        PID:1000
  - - 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:2332

C:\Windows\system32\schtasks.exe
schtasks.exe /create /tn "csrssc" /sc MINUTE /mo 14 /tr "'C:\Windows\AppPatch\AppPatch64\csrss.exe'" /f
1⤵
- Process spawned unexpected child process
- Scheduled Task/Job: Scheduled Task
PID:2780

C:\Windows\system32\schtasks.exe
schtasks.exe /create /tn "csrss" /sc ONLOGON /tr "'C:\Windows\AppPatch\AppPatch64\csrss.exe'" /rl HIGHEST /f
1⤵
- Process spawned unexpected child process
- Scheduled Task/Job: Scheduled Task
PID:2288

C:\Windows\system32\schtasks.exe
schtasks.exe /create /tn "csrssc" /sc MINUTE /mo 8 /tr "'C:\Windows\AppPatch\AppPatch64\csrss.exe'" /rl HIGHEST /f
1⤵
- Process spawned unexpected child process
- Scheduled Task/Job: Scheduled Task
PID:3040

C:\Windows\system32\schtasks.exe
schtasks.exe /create /tn "wininitw" /sc MINUTE /mo 5 /tr "'C:\Users\Default User\wininit.exe'" /f
1⤵
- Process spawned unexpected child process
- Scheduled Task/Job: Scheduled Task
PID:2712

C:\Windows\system32\schtasks.exe
schtasks.exe /create /tn "wininit" /sc ONLOGON /tr "'C:\Users\Default User\wininit.exe'" /rl HIGHEST /f
1⤵
- Process spawned unexpected child process
- Scheduled Task/Job: Scheduled Task
PID:2668

C:\Windows\system32\schtasks.exe
schtasks.exe /create /tn "wininitw" /sc MINUTE /mo 7 /tr "'C:\Users\Default User\wininit.exe'" /rl HIGHEST /f
1⤵
- Process spawned unexpected child process
- Scheduled Task/Job: Scheduled Task
PID:2708

C:\Windows\system32\schtasks.exe
schtasks.exe /create /tn "cmdc" /sc MINUTE /mo 6 /tr "'C:\Program Files\Windows Photo Viewer\it-IT\cmd.exe'" /f
1⤵
- Process spawned unexpected child process
- Scheduled Task/Job: Scheduled Task
PID:2508

C:\Windows\system32\schtasks.exe
schtasks.exe /create /tn "cmd" /sc ONLOGON /tr "'C:\Program Files\Windows Photo Viewer\it-IT\cmd.exe'" /rl HIGHEST /f
1⤵
- Process spawned unexpected child process
- Scheduled Task/Job: Scheduled Task
PID:1392

C:\Windows\system32\schtasks.exe
schtasks.exe /create /tn "cmdc" /sc MINUTE /mo 7 /tr "'C:\Program Files\Windows Photo Viewer\it-IT\cmd.exe'" /rl HIGHEST /f
1⤵
- Process spawned unexpected child process
- Scheduled Task/Job: Scheduled Task
PID:336

C:\Windows\system32\schtasks.exe
schtasks.exe /create /tn "explorere" /sc MINUTE /mo 14 /tr "'C:\MSOCache\All Users\{90140000-002C-0409-0000-0000000FF1CE}-C\Proof.fr\explorer.exe'" /f
1⤵
- Process spawned unexpected child process
- Scheduled Task/Job: Scheduled Task
PID:616

C:\Windows\system32\schtasks.exe
schtasks.exe /create /tn "explorer" /sc ONLOGON /tr "'C:\MSOCache\All Users\{90140000-002C-0409-0000-0000000FF1CE}-C\Proof.fr\explorer.exe'" /rl HIGHEST /f
1⤵
- Process spawned unexpected child process
- Scheduled Task/Job: Scheduled Task
PID:1752

C:\Windows\system32\schtasks.exe
schtasks.exe /create /tn "explorere" /sc MINUTE /mo 14 /tr "'C:\MSOCache\All Users\{90140000-002C-0409-0000-0000000FF1CE}-C\Proof.fr\explorer.exe'" /rl HIGHEST /f
1⤵
- Process spawned unexpected child process
- Scheduled Task/Job: Scheduled Task
PID:2964

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

1

T1012

System Information Discovery

1

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:\msServercomponentweb\A6MW0Y9mrWWMXc6x0fq3HB4apg3.bat

Filesize
151B

MD5
4b21c00379ad8ddc0506437738f1d391

SHA1
988b1e82626e496602e7b508310fb35fe5882447

SHA256
368d1d57f782f01c424052f5b10070c6a134b5afcf92ff942f15e25f7e812930

SHA512
13d4661b54741f0862025eee3b7009d6db2737bf817d41bc22414e7c821f9dd730981d9d64a0a421a8cc1056b87cf18172fbe02173ef17b248b1a5af454ee53d

Download Submit
C:\msServercomponentweb\LnKd9V5Ane60N.vbe

Filesize
224B

MD5
1d2a93f7694f3dd573699d3c8d77e7fc

SHA1
09151319bfbffce8b299894dea5fc5b7231213f2

SHA256
6bb6489da06439a8b904b93648e74fa7ffb68ff62442632ac4a003d70b9a2b89

SHA512
68d943a19b078bcb9923f299248d461730c52411eacfbc46f68112886ce8a1140de7ed5cb824b2dd5b6ac8ce77bda58a4d7e4e85f7667a592c5a7da7722392b7

Download Submit
C:\msServercomponentweb\WebReview.exe

Filesize
828KB

MD5
deb7ba77dcf2e54fb23d1a9b0e51088d

SHA1
6468abad160c22594fc014d948963ba4a8565074

SHA256
05b123c99c5736a62f1cfd6bc6a9335a533849fe663d875d20ece0caca82e077

SHA512
18cedb50ceab47fed77100586bbb68692d82e4d3afe59815e0fb0d7c88677362756d2bcdc3003f0e6e1b2a3edff36ac450a9864d4d64ef5218612bc86e538de2

Download Submit
memory/1000-28-0x00000000003E0000-0x00000000004B6000-memory.dmp

Filesize
856KB

Download
memory/2552-13-0x0000000000E00000-0x0000000000ED6000-memory.dmp

Filesize
856KB

Download

Analysis

Sharing

General

Malware Config

Signatures

Processes

Network

MITRE ATT&CK Enterprise v15

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Downloads