dcrat | 93e35f881bc6e9f03a420d9ecfac81a0af3f71f10918eb9be5c33cb18d7f56c6

General

Target

93e35f881bc6e9f03a420d9ecfac81a0af3f71f10918eb9be5c33cb18d7f56c6.exe
Size

1.1MB
MD5

8de0b1533dc90527d236cd6c854cbc24
SHA1

dd896192fcb96620c82dd1a8a0f94ca658e09f78
SHA256

93e35f881bc6e9f03a420d9ecfac81a0af3f71f10918eb9be5c33cb18d7f56c6
SHA512

33c279f2890ea572ea3f8921bb35648d7339eac2fd7d7f9f2548b43481fa0ffcee562879ecf521a5ff0b6679aa907731d93dbc45ce0fcb41ccb7fe4ae4762887
SSDEEP

24576:U2G/nvxW3Ww0tI2qYVrBvevwx8P9brkuXa:UbA30I2TvkPOX

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
Dcrat family
dcrat

Process spawned unexpected child process 24 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	1056	2476	schtasks.exe	34
Parent C:\Windows\system32\wbem\wmiprvse.exe is not expected to spawn this process	396	2476	schtasks.exe	34
Parent C:\Windows\system32\wbem\wmiprvse.exe is not expected to spawn this process	2024	2476	schtasks.exe	34
Parent C:\Windows\system32\wbem\wmiprvse.exe is not expected to spawn this process	2424	2476	schtasks.exe	34
Parent C:\Windows\system32\wbem\wmiprvse.exe is not expected to spawn this process	1060	2476	schtasks.exe	34
Parent C:\Windows\system32\wbem\wmiprvse.exe is not expected to spawn this process	2168	2476	schtasks.exe	34
Parent C:\Windows\system32\wbem\wmiprvse.exe is not expected to spawn this process	1816	2476	schtasks.exe	34
Parent C:\Windows\system32\wbem\wmiprvse.exe is not expected to spawn this process	2232	2476	schtasks.exe	34
Parent C:\Windows\system32\wbem\wmiprvse.exe is not expected to spawn this process	2188	2476	schtasks.exe	34
Parent C:\Windows\system32\wbem\wmiprvse.exe is not expected to spawn this process	2176	2476	schtasks.exe	34
Parent C:\Windows\system32\wbem\wmiprvse.exe is not expected to spawn this process	2396	2476	schtasks.exe	34
Parent C:\Windows\system32\wbem\wmiprvse.exe is not expected to spawn this process	2444	2476	schtasks.exe	34
Parent C:\Windows\system32\wbem\wmiprvse.exe is not expected to spawn this process	2980	2476	schtasks.exe	34
Parent C:\Windows\system32\wbem\wmiprvse.exe is not expected to spawn this process	2260	2476	schtasks.exe	34
Parent C:\Windows\system32\wbem\wmiprvse.exe is not expected to spawn this process	2316	2476	schtasks.exe	34
Parent C:\Windows\system32\wbem\wmiprvse.exe is not expected to spawn this process	2632	2476	schtasks.exe	34
Parent C:\Windows\system32\wbem\wmiprvse.exe is not expected to spawn this process	1792	2476	schtasks.exe	34
Parent C:\Windows\system32\wbem\wmiprvse.exe is not expected to spawn this process	716	2476	schtasks.exe	34
Parent C:\Windows\system32\wbem\wmiprvse.exe is not expected to spawn this process	1104	2476	schtasks.exe	34
Parent C:\Windows\system32\wbem\wmiprvse.exe is not expected to spawn this process	772	2476	schtasks.exe	34
Parent C:\Windows\system32\wbem\wmiprvse.exe is not expected to spawn this process	2460	2476	schtasks.exe	34
Parent C:\Windows\system32\wbem\wmiprvse.exe is not expected to spawn this process	2376	2476	schtasks.exe	34
Parent C:\Windows\system32\wbem\wmiprvse.exe is not expected to spawn this process	2504	2476	schtasks.exe	34
Parent C:\Windows\system32\wbem\wmiprvse.exe is not expected to spawn this process	1944	2476	schtasks.exe	34

DCRat payload 3 IoCs

Detects payload of DCRat, commonly dropped by NSIS installers.

rat

resource	yara_rule
behavioral1/files/0x0009000000018f85-9.dat	dcrat
behavioral1/memory/2832-13-0x00000000011C0000-0x0000000001296000-memory.dmp	dcrat
behavioral1/memory/1848-37-0x0000000000AC0000-0x0000000000B96000-memory.dmp	dcrat

Executes dropped EXE 2 IoCs

pid	Process
2832	MsBlock.exe
1848	OSPPSVC.exe

Loads dropped DLL 2 IoCs

pid	Process
2692	cmd.exe
2692	cmd.exe

Drops file in Program Files directory 4 IoCs

description	ioc	Process
File created	C:\Program Files (x86)\Internet Explorer\en-US\dwm.exe	MsBlock.exe
File created	C:\Program Files (x86)\Internet Explorer\en-US\6cb0b6c459d5d3	MsBlock.exe
File created	C:\Program Files (x86)\Microsoft SQL Server Compact Edition\lsm.exe	MsBlock.exe
File created	C:\Program Files (x86)\Microsoft SQL Server Compact Edition\101b941d020240	MsBlock.exe

Drops file in Windows directory 9 IoCs

description	ioc	Process
File opened for modification	C:\Windows\TAPI\taskhost.exe	MsBlock.exe
File created	C:\Windows\TAPI\b75386f1303e64	MsBlock.exe
File created	C:\Windows\Media\Cityscape\audiodg.exe	MsBlock.exe
File created	C:\Windows\Media\Cityscape\42af1c969fbb7b	MsBlock.exe
File created	C:\Windows\addins\winlogon.exe	MsBlock.exe
File created	C:\Windows\Cursors\csrss.exe	MsBlock.exe
File created	C:\Windows\Cursors\886983d96e3d3e	MsBlock.exe
File created	C:\Windows\TAPI\taskhost.exe	MsBlock.exe
File created	C:\Windows\addins\cc11b995f2a76d	MsBlock.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	93e35f881bc6e9f03a420d9ecfac81a0af3f71f10918eb9be5c33cb18d7f56c6.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 24 IoCs

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

persistence execution

Scheduled Task

T1053.005

pid	Process
2316	schtasks.exe
2632	schtasks.exe
2460	schtasks.exe
2188	schtasks.exe
1060	schtasks.exe
2396	schtasks.exe
2980	schtasks.exe
2504	schtasks.exe
1056	schtasks.exe
2424	schtasks.exe
2168	schtasks.exe
2232	schtasks.exe
2176	schtasks.exe
1792	schtasks.exe
2024	schtasks.exe
1816	schtasks.exe
2444	schtasks.exe
2260	schtasks.exe
716	schtasks.exe
1104	schtasks.exe
772	schtasks.exe
2376	schtasks.exe
396	schtasks.exe
1944	schtasks.exe

Suspicious behavior: EnumeratesProcesses 2 IoCs

pid	Process
2832	MsBlock.exe
1848	OSPPSVC.exe

Suspicious use of AdjustPrivilegeToken 2 IoCs

description	pid	Process
Token: SeDebugPrivilege	2832	MsBlock.exe
Token: SeDebugPrivilege	1848	OSPPSVC.exe

Suspicious use of WriteProcessMemory 21 IoCs

description	pid	Process	procid_target
PID 2884 wrote to memory of 2088	2884	93e35f881bc6e9f03a420d9ecfac81a0af3f71f10918eb9be5c33cb18d7f56c6.exe	30
PID 2884 wrote to memory of 2088	2884	93e35f881bc6e9f03a420d9ecfac81a0af3f71f10918eb9be5c33cb18d7f56c6.exe	30
PID 2884 wrote to memory of 2088	2884	93e35f881bc6e9f03a420d9ecfac81a0af3f71f10918eb9be5c33cb18d7f56c6.exe	30
PID 2884 wrote to memory of 2088	2884	93e35f881bc6e9f03a420d9ecfac81a0af3f71f10918eb9be5c33cb18d7f56c6.exe	30
PID 2088 wrote to memory of 2692	2088	WScript.exe	31
PID 2088 wrote to memory of 2692	2088	WScript.exe	31
PID 2088 wrote to memory of 2692	2088	WScript.exe	31
PID 2088 wrote to memory of 2692	2088	WScript.exe	31
PID 2692 wrote to memory of 2832	2692	cmd.exe	33
PID 2692 wrote to memory of 2832	2692	cmd.exe	33
PID 2692 wrote to memory of 2832	2692	cmd.exe	33
PID 2692 wrote to memory of 2832	2692	cmd.exe	33
PID 2832 wrote to memory of 2420	2832	MsBlock.exe	59
PID 2832 wrote to memory of 2420	2832	MsBlock.exe	59
PID 2832 wrote to memory of 2420	2832	MsBlock.exe	59
PID 2420 wrote to memory of 1376	2420	cmd.exe	61
PID 2420 wrote to memory of 1376	2420	cmd.exe	61
PID 2420 wrote to memory of 1376	2420	cmd.exe	61
PID 2420 wrote to memory of 1848	2420	cmd.exe	62
PID 2420 wrote to memory of 1848	2420	cmd.exe	62
PID 2420 wrote to memory of 1848	2420	cmd.exe	62

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\93e35f881bc6e9f03a420d9ecfac81a0af3f71f10918eb9be5c33cb18d7f56c6.exe
"C:\Users\Admin\AppData\Local\Temp\93e35f881bc6e9f03a420d9ecfac81a0af3f71f10918eb9be5c33cb18d7f56c6.exe"
1⤵
- System Location Discovery: System Language Discovery
- Suspicious use of WriteProcessMemory
PID:2884
- C:\Windows\SysWOW64\WScript.exe
  "C:\Windows\System32\WScript.exe" "C:\intoHost\pN2iKIl2JrbfNIx.vbe"
  2⤵
  - System Location Discovery: System Language Discovery
  - Suspicious use of WriteProcessMemory
  PID:2088
- - C:\Windows\SysWOW64\cmd.exe
    cmd /c ""C:\intoHost\z07BaoIs8R5lt5yU6uoZdloB3t.bat" "
    3⤵
    - Loads dropped DLL
    - System Location Discovery: System Language Discovery
    - Suspicious use of WriteProcessMemory
    PID:2692
  - - C:\intoHost\MsBlock.exe
      "C:\intoHost\MsBlock.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:2832
    - - C:\Windows\System32\cmd.exe
        
        "C:\Windows\System32\cmd.exe" /C "C:\Users\Admin\AppData\Local\Temp\8QnLGcWWZk.bat"
        5⤵
        Suspicious use of WriteProcessMemory
        
        PID:2420
      - C:\Windows\system32\w32tm.exe
        
        w32tm /stripchart /computer:localhost /period:5 /dataonly /samples:2
        6⤵
        
        PID:1376
      - C:\Recovery\31f19e42-8726-11ef-be9a-dab21757c799\OSPPSVC.exe
        
        "C:\Recovery\31f19e42-8726-11ef-be9a-dab21757c799\OSPPSVC.exe"
        6⤵
        Executes dropped EXE
        Suspicious behavior: EnumeratesProcesses
        Suspicious use of AdjustPrivilegeToken
        
        PID:1848

C:\Windows\system32\schtasks.exe
schtasks.exe /create /tn "taskhostt" /sc MINUTE /mo 8 /tr "'C:\Windows\TAPI\taskhost.exe'" /f
1⤵
- Process spawned unexpected child process
- Scheduled Task/Job: Scheduled Task
PID:1056

C:\Windows\system32\schtasks.exe
schtasks.exe /create /tn "taskhost" /sc ONLOGON /tr "'C:\Windows\TAPI\taskhost.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 "taskhostt" /sc MINUTE /mo 7 /tr "'C:\Windows\TAPI\taskhost.exe'" /rl HIGHEST /f
1⤵
- Process spawned unexpected child process
- Scheduled Task/Job: Scheduled Task
PID:2024

C:\Windows\system32\schtasks.exe
schtasks.exe /create /tn "dwmd" /sc MINUTE /mo 7 /tr "'C:\Program Files (x86)\Internet Explorer\en-US\dwm.exe'" /f
1⤵
- Process spawned unexpected child process
- Scheduled Task/Job: Scheduled Task
PID:2424

C:\Windows\system32\schtasks.exe
schtasks.exe /create /tn "dwm" /sc ONLOGON /tr "'C:\Program Files (x86)\Internet Explorer\en-US\dwm.exe'" /rl HIGHEST /f
1⤵
- Process spawned unexpected child process
- Scheduled Task/Job: Scheduled Task
PID:1060

C:\Windows\system32\schtasks.exe
schtasks.exe /create /tn "dwmd" /sc MINUTE /mo 14 /tr "'C:\Program Files (x86)\Internet Explorer\en-US\dwm.exe'" /rl HIGHEST /f
1⤵
- Process spawned unexpected child process
- Scheduled Task/Job: Scheduled Task
PID:2168

C:\Windows\system32\schtasks.exe
schtasks.exe /create /tn "servicess" /sc MINUTE /mo 13 /tr "'C:\MSOCache\All Users\{90140000-001B-0409-0000-0000000FF1CE}-C\services.exe'" /f
1⤵
- Process spawned unexpected child process
- Scheduled Task/Job: Scheduled Task
PID:1816

C:\Windows\system32\schtasks.exe
schtasks.exe /create /tn "services" /sc ONLOGON /tr "'C:\MSOCache\All Users\{90140000-001B-0409-0000-0000000FF1CE}-C\services.exe'" /rl HIGHEST /f
1⤵
- Process spawned unexpected child process
- Scheduled Task/Job: Scheduled Task
PID:2232

C:\Windows\system32\schtasks.exe
schtasks.exe /create /tn "servicess" /sc MINUTE /mo 11 /tr "'C:\MSOCache\All Users\{90140000-001B-0409-0000-0000000FF1CE}-C\services.exe'" /rl HIGHEST /f
1⤵
- Process spawned unexpected child process
- Scheduled Task/Job: Scheduled Task
PID:2188

C:\Windows\system32\schtasks.exe
schtasks.exe /create /tn "lsml" /sc MINUTE /mo 14 /tr "'C:\Program Files (x86)\Microsoft SQL Server Compact Edition\lsm.exe'" /f
1⤵
- Process spawned unexpected child process
- Scheduled Task/Job: Scheduled Task
PID:2176

C:\Windows\system32\schtasks.exe
schtasks.exe /create /tn "lsm" /sc ONLOGON /tr "'C:\Program Files (x86)\Microsoft SQL Server Compact Edition\lsm.exe'" /rl HIGHEST /f
1⤵
- Process spawned unexpected child process
- Scheduled Task/Job: Scheduled Task
PID:2396

C:\Windows\system32\schtasks.exe
schtasks.exe /create /tn "lsml" /sc MINUTE /mo 11 /tr "'C:\Program Files (x86)\Microsoft SQL Server Compact Edition\lsm.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 "OSPPSVCO" /sc MINUTE /mo 6 /tr "'C:\Recovery\31f19e42-8726-11ef-be9a-dab21757c799\OSPPSVC.exe'" /f
1⤵
- Process spawned unexpected child process
- Scheduled Task/Job: Scheduled Task
PID:2980

C:\Windows\system32\schtasks.exe
schtasks.exe /create /tn "OSPPSVC" /sc ONLOGON /tr "'C:\Recovery\31f19e42-8726-11ef-be9a-dab21757c799\OSPPSVC.exe'" /rl HIGHEST /f
1⤵
- Process spawned unexpected child process
- Scheduled Task/Job: Scheduled Task
PID:2260

C:\Windows\system32\schtasks.exe
schtasks.exe /create /tn "OSPPSVCO" /sc MINUTE /mo 9 /tr "'C:\Recovery\31f19e42-8726-11ef-be9a-dab21757c799\OSPPSVC.exe'" /rl HIGHEST /f
1⤵
- Process spawned unexpected child process
- Scheduled Task/Job: Scheduled Task
PID:2316

C:\Windows\system32\schtasks.exe
schtasks.exe /create /tn "audiodga" /sc MINUTE /mo 10 /tr "'C:\Windows\Media\Cityscape\audiodg.exe'" /f
1⤵
- Process spawned unexpected child process
- Scheduled Task/Job: Scheduled Task
PID:2632

C:\Windows\system32\schtasks.exe
schtasks.exe /create /tn "audiodg" /sc ONLOGON /tr "'C:\Windows\Media\Cityscape\audiodg.exe'" /rl HIGHEST /f
1⤵
- Process spawned unexpected child process
- Scheduled Task/Job: Scheduled Task
PID:1792

C:\Windows\system32\schtasks.exe
schtasks.exe /create /tn "audiodga" /sc MINUTE /mo 7 /tr "'C:\Windows\Media\Cityscape\audiodg.exe'" /rl HIGHEST /f
1⤵
- Process spawned unexpected child process
- Scheduled Task/Job: Scheduled Task
PID:716

C:\Windows\system32\schtasks.exe
schtasks.exe /create /tn "winlogonw" /sc MINUTE /mo 11 /tr "'C:\Windows\addins\winlogon.exe'" /f
1⤵
- Process spawned unexpected child process
- Scheduled Task/Job: Scheduled Task
PID:1104

C:\Windows\system32\schtasks.exe
schtasks.exe /create /tn "winlogon" /sc ONLOGON /tr "'C:\Windows\addins\winlogon.exe'" /rl HIGHEST /f
1⤵
- Process spawned unexpected child process
- Scheduled Task/Job: Scheduled Task
PID:772

C:\Windows\system32\schtasks.exe
schtasks.exe /create /tn "winlogonw" /sc MINUTE /mo 13 /tr "'C:\Windows\addins\winlogon.exe'" /rl HIGHEST /f
1⤵
- Process spawned unexpected child process
- Scheduled Task/Job: Scheduled Task
PID:2460

C:\Windows\system32\schtasks.exe
schtasks.exe /create /tn "csrssc" /sc MINUTE /mo 7 /tr "'C:\Windows\Cursors\csrss.exe'" /f
1⤵
- Process spawned unexpected child process
- Scheduled Task/Job: Scheduled Task
PID:2376

C:\Windows\system32\schtasks.exe
schtasks.exe /create /tn "csrss" /sc ONLOGON /tr "'C:\Windows\Cursors\csrss.exe'" /rl HIGHEST /f
1⤵
- Process spawned unexpected child process
- Scheduled Task/Job: Scheduled Task
PID:1944

C:\Windows\system32\schtasks.exe
schtasks.exe /create /tn "csrssc" /sc MINUTE /mo 9 /tr "'C:\Windows\Cursors\csrss.exe'" /rl HIGHEST /f
1⤵
- Process spawned unexpected child process
- Scheduled Task/Job: Scheduled Task
PID:2504

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

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:\Users\Admin\AppData\Local\Temp\8QnLGcWWZk.bat

Filesize
225B

MD5
93e51d1d3a06344c1dec73f383f278e5

SHA1
26b63ec36fcc06fe94fbeb114796a043faf4eec4

SHA256
549ca824de4920ef13b020a87ef033021512c890499ab9ea801313917b46963a

SHA512
1a68701d7423c0791feb670aa934855b8f9c7f291f81d7faa7c2e81bddd17b73bd48eede5222c2c5006b5c85a5746f561a4258cc5cdd9452a7803c270b322a03

Download Submit
C:\intoHost\pN2iKIl2JrbfNIx.vbe

Filesize
211B

MD5
672ef18aa1c9cf2cf6c906bba7d1435b

SHA1
4d72a4c6cb3aaeef5b02cef71ad42211f185c93a

SHA256
a016b82ba799c1cf780c9ebb6cf0540c26aad664f5525d1ccc8b470fdaaa0075

SHA512
8b5d37f4fb7b1df56118866f9cc18d0ce323167185258b2e8b830d91f20e2ee85eda6b145f25d363630790ddf7d188eb1507f051095fc63be4bfaef1760bc20e

Download Submit
C:\intoHost\z07BaoIs8R5lt5yU6uoZdloB3t.bat

Filesize
25B

MD5
5c9b6d735522c5246a33bbadaa92c7db

SHA1
f676e86ecb933d676095e187a50febbd61bbc344

SHA256
47148fdb946ede0b9fab190f1ae5dd459d096873cca3585642183674313fe551

SHA512
63fafa045ca419b1394b2255ef32bf4fb6a40ff8b45ade892723ec41a50a831cce7c4266e489f825dc4e574d07b38e216c12337a89743c70e6de35470e798875

Download Submit
\intoHost\MsBlock.exe

Filesize
828KB

MD5
dca7880645d6318a20d020f2a51b7a8c

SHA1
5c5e493ce685a79ecb58ef2fdc6d9a4364c0a276

SHA256
9c03c25f02d71bfc3ab23870d882274e9b34626d1374491529818e19851510b9

SHA512
3fa226e65382fed9f3dd959e80e4483866da3b339c277906ab1b08db067be6f6ec1d73b9ad3067b4046e512f8f08940528bf8573edc83d999f18f890fc210807

Download Submit
memory/1848-37-0x0000000000AC0000-0x0000000000B96000-memory.dmp

Filesize
856KB

Download
memory/2832-13-0x00000000011C0000-0x0000000001296000-memory.dmp

Filesize
856KB

Download

Analysis

Sharing

General

Malware Config

Signatures

Processes

Network

MITRE ATT&CK Enterprise v15

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Downloads