dcrat | 0787eb4dd27381f7ff0adf97ef8d3401b2aa400e76248e7b274b97d024590015

General

Target

123.exe
Size

1.1MB
MD5

0a1305a13966bdd5fb23b12848ea9bfc
SHA1

ba647a51d8205e46f962904dba0f0781a7915953
SHA256

0787eb4dd27381f7ff0adf97ef8d3401b2aa400e76248e7b274b97d024590015
SHA512

0f3f9c823480164e16d944464181a7a934b2b3d749d0a58c1d5314b0af382261cd0f670d1c74f37afee322a60488ae34ceac052d34a8355dc1bc9ef69f4940aa
SSDEEP

24576:U2G/nvxW3Ww0t1KW+9o9JUtXsL4PMveRc8NEpH2:UbA30MK9JUi4o2r

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 21 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	4648	3892	schtasks.exe	87
Parent C:\Windows\system32\wbem\wmiprvse.exe is not expected to spawn this process	2456	3892	schtasks.exe	87
Parent C:\Windows\system32\wbem\wmiprvse.exe is not expected to spawn this process	2908	3892	schtasks.exe	87
Parent C:\Windows\system32\wbem\wmiprvse.exe is not expected to spawn this process	5044	3892	schtasks.exe	87
Parent C:\Windows\system32\wbem\wmiprvse.exe is not expected to spawn this process	1060	3892	schtasks.exe	87
Parent C:\Windows\system32\wbem\wmiprvse.exe is not expected to spawn this process	4424	3892	schtasks.exe	87
Parent C:\Windows\system32\wbem\wmiprvse.exe is not expected to spawn this process	2600	3892	schtasks.exe	87
Parent C:\Windows\system32\wbem\wmiprvse.exe is not expected to spawn this process	1352	3892	schtasks.exe	87
Parent C:\Windows\system32\wbem\wmiprvse.exe is not expected to spawn this process	4768	3892	schtasks.exe	87
Parent C:\Windows\system32\wbem\wmiprvse.exe is not expected to spawn this process	3520	3892	schtasks.exe	87
Parent C:\Windows\system32\wbem\wmiprvse.exe is not expected to spawn this process	3952	3892	schtasks.exe	87
Parent C:\Windows\system32\wbem\wmiprvse.exe is not expected to spawn this process	1632	3892	schtasks.exe	87
Parent C:\Windows\system32\wbem\wmiprvse.exe is not expected to spawn this process	3204	3892	schtasks.exe	87
Parent C:\Windows\system32\wbem\wmiprvse.exe is not expected to spawn this process	3292	3892	schtasks.exe	87
Parent C:\Windows\system32\wbem\wmiprvse.exe is not expected to spawn this process	3772	3892	schtasks.exe	87
Parent C:\Windows\system32\wbem\wmiprvse.exe is not expected to spawn this process	2468	3892	schtasks.exe	87
Parent C:\Windows\system32\wbem\wmiprvse.exe is not expected to spawn this process	4472	3892	schtasks.exe	87
Parent C:\Windows\system32\wbem\wmiprvse.exe is not expected to spawn this process	1064	3892	schtasks.exe	87
Parent C:\Windows\system32\wbem\wmiprvse.exe is not expected to spawn this process	1828	3892	schtasks.exe	87
Parent C:\Windows\system32\wbem\wmiprvse.exe is not expected to spawn this process	2408	3892	schtasks.exe	87
Parent C:\Windows\system32\wbem\wmiprvse.exe is not expected to spawn this process	2768	3892	schtasks.exe	87

DCRat payload 2 IoCs

Detects payload of DCRat, commonly dropped by NSIS installers.

rat

resource	yara_rule
behavioral2/files/0x000a000000023b7b-10.dat	dcrat
behavioral2/memory/4208-13-0x00000000003A0000-0x0000000000476000-memory.dmp	dcrat

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-1-5-21-493223053-2004649691-1575712786-1000\Control Panel\International\Geo\Nation	123.exe
Key value queried	\REGISTRY\USER\S-1-5-21-493223053-2004649691-1575712786-1000\Control Panel\International\Geo\Nation	WScript.exe
Key value queried	\REGISTRY\USER\S-1-5-21-493223053-2004649691-1575712786-1000\Control Panel\International\Geo\Nation	browserreviewcommon.exe

Executes dropped EXE 2 IoCs

pid	Process
4208	browserreviewcommon.exe
3068	smss.exe

Drops file in Program Files directory 9 IoCs

description	ioc	Process
File created	C:\Program Files\VideoLAN\56085415360792	browserreviewcommon.exe
File created	C:\Program Files (x86)\Windows NT\SppExtComObj.exe	browserreviewcommon.exe
File created	C:\Program Files (x86)\Windows NT\e1ef82546f0b02	browserreviewcommon.exe
File created	C:\Program Files\Google\explorer.exe	browserreviewcommon.exe
File created	C:\Program Files\Google\7a0fd90576e088	browserreviewcommon.exe
File created	C:\Program Files\Windows Media Player\RuntimeBroker.exe	browserreviewcommon.exe
File created	C:\Program Files\VideoLAN\wininit.exe	browserreviewcommon.exe
File opened for modification	C:\Program Files\Windows Media Player\RuntimeBroker.exe	browserreviewcommon.exe
File created	C:\Program Files\Windows Media Player\9e8d7a4ca61bd9	browserreviewcommon.exe

Drops file in Windows directory 4 IoCs

description	ioc	Process
File created	C:\Windows\Panther\setup.exe\5940a34987c991	browserreviewcommon.exe
File created	C:\Windows\Cursors\smss.exe	browserreviewcommon.exe
File created	C:\Windows\Cursors\69ddcba757bf72	browserreviewcommon.exe
File created	C:\Windows\Panther\setup.exe\dllhost.exe	browserreviewcommon.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	123.exe
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	WScript.exe
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	cmd.exe

Modifies registry class 2 IoCs

description	ioc	Process
Key created	\REGISTRY\USER\S-1-5-21-493223053-2004649691-1575712786-1000_Classes\Local Settings	123.exe
Key created	\REGISTRY\USER\S-1-5-21-493223053-2004649691-1575712786-1000_Classes\Local Settings	browserreviewcommon.exe

Scheduled Task/Job: Scheduled Task 1 TTPs 21 IoCs

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

persistence execution

Scheduled Task

T1053.005

pid	Process
2768	schtasks.exe
2456	schtasks.exe
1352	schtasks.exe
4768	schtasks.exe
3952	schtasks.exe
3292	schtasks.exe
1828	schtasks.exe
3520	schtasks.exe
4472	schtasks.exe
2408	schtasks.exe
2908	schtasks.exe
5044	schtasks.exe
2600	schtasks.exe
3204	schtasks.exe
3772	schtasks.exe
2468	schtasks.exe
4648	schtasks.exe
1060	schtasks.exe
4424	schtasks.exe
1632	schtasks.exe
1064	schtasks.exe

Suspicious behavior: EnumeratesProcesses 10 IoCs

pid	Process
4208	browserreviewcommon.exe
3068	smss.exe
3068	smss.exe
3068	smss.exe
3068	smss.exe
3068	smss.exe
3068	smss.exe
3068	smss.exe
3068	smss.exe
3068	smss.exe

Suspicious use of AdjustPrivilegeToken 2 IoCs

description	pid	Process
Token: SeDebugPrivilege	4208	browserreviewcommon.exe
Token: SeDebugPrivilege	3068	smss.exe

Suspicious use of WriteProcessMemory 14 IoCs

description	pid	Process	procid_target
PID 4928 wrote to memory of 64	4928	123.exe	83
PID 4928 wrote to memory of 64	4928	123.exe	83
PID 4928 wrote to memory of 64	4928	123.exe	83
PID 64 wrote to memory of 4912	64	WScript.exe	84
PID 64 wrote to memory of 4912	64	WScript.exe	84
PID 64 wrote to memory of 4912	64	WScript.exe	84
PID 4912 wrote to memory of 4208	4912	cmd.exe	86
PID 4912 wrote to memory of 4208	4912	cmd.exe	86
PID 4208 wrote to memory of 860	4208	browserreviewcommon.exe	111
PID 4208 wrote to memory of 860	4208	browserreviewcommon.exe	111
PID 860 wrote to memory of 1760	860	cmd.exe	113
PID 860 wrote to memory of 1760	860	cmd.exe	113
PID 860 wrote to memory of 3068	860	cmd.exe	119
PID 860 wrote to memory of 3068	860	cmd.exe	119

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\123.exe
"C:\Users\Admin\AppData\Local\Temp\123.exe"
1⤵
- Checks computer location settings
- System Location Discovery: System Language Discovery
- Modifies registry class
- Suspicious use of WriteProcessMemory
PID:4928
- C:\Windows\SysWOW64\WScript.exe
  "C:\Windows\System32\WScript.exe" "C:\Intorefmonitor\J0X6sOBXzJWwanFreLiD2W8Em.vbe"
  2⤵
  - Checks computer location settings
  - System Location Discovery: System Language Discovery
  - Suspicious use of WriteProcessMemory
  PID:64
- - C:\Windows\SysWOW64\cmd.exe
    C:\Windows\system32\cmd.exe /c ""C:\Intorefmonitor\FYAEr71891wWlEwRPl694a2WBb.bat" "
    3⤵
    - System Location Discovery: System Language Discovery
    - Suspicious use of WriteProcessMemory
    PID:4912
  - - C:\Intorefmonitor\browserreviewcommon.exe
      "C:\Intorefmonitor\browserreviewcommon.exe"
      4⤵
      Checks computer location settings
      Executes dropped EXE
      Drops file in Program Files directory
      Drops file in Windows directory
      Modifies registry class
      Suspicious behavior: EnumeratesProcesses
      Suspicious use of AdjustPrivilegeToken
      Suspicious use of WriteProcessMemory
      PID:4208
    - - C:\Windows\System32\cmd.exe
        
        "C:\Windows\System32\cmd.exe" /C "C:\Users\Admin\AppData\Local\Temp\tAV1Y7tqnp.bat"
        5⤵
        Suspicious use of WriteProcessMemory
        
        PID:860
      - C:\Windows\system32\w32tm.exe
        
        w32tm /stripchart /computer:localhost /period:5 /dataonly /samples:2
        6⤵
        
        PID:1760
      - C:\Windows\Cursors\smss.exe
        
        "C:\Windows\Cursors\smss.exe"
        6⤵
        Executes dropped EXE
        Suspicious behavior: EnumeratesProcesses
        Suspicious use of AdjustPrivilegeToken
        
        PID:3068

C:\Windows\system32\schtasks.exe
schtasks.exe /create /tn "RuntimeBrokerR" /sc MINUTE /mo 9 /tr "'C:\Program Files\Windows Media Player\RuntimeBroker.exe'" /f
1⤵
- Process spawned unexpected child process
- Scheduled Task/Job: Scheduled Task
PID:4648

C:\Windows\system32\schtasks.exe
schtasks.exe /create /tn "RuntimeBroker" /sc ONLOGON /tr "'C:\Program Files\Windows Media Player\RuntimeBroker.exe'" /rl HIGHEST /f
1⤵
- Process spawned unexpected child process
- Scheduled Task/Job: Scheduled Task
PID:2456

C:\Windows\system32\schtasks.exe
schtasks.exe /create /tn "RuntimeBrokerR" /sc MINUTE /mo 13 /tr "'C:\Program Files\Windows Media Player\RuntimeBroker.exe'" /rl HIGHEST /f
1⤵
- Process spawned unexpected child process
- Scheduled Task/Job: Scheduled Task
PID:2908

C:\Windows\system32\schtasks.exe
schtasks.exe /create /tn "wininitw" /sc MINUTE /mo 9 /tr "'C:\Program Files\VideoLAN\wininit.exe'" /f
1⤵
- Process spawned unexpected child process
- Scheduled Task/Job: Scheduled Task
PID:5044

C:\Windows\system32\schtasks.exe
schtasks.exe /create /tn "wininit" /sc ONLOGON /tr "'C:\Program Files\VideoLAN\wininit.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 "wininitw" /sc MINUTE /mo 11 /tr "'C:\Program Files\VideoLAN\wininit.exe'" /rl HIGHEST /f
1⤵
- Process spawned unexpected child process
- Scheduled Task/Job: Scheduled Task
PID:4424

C:\Windows\system32\schtasks.exe
schtasks.exe /create /tn "SppExtComObjS" /sc MINUTE /mo 10 /tr "'C:\Program Files (x86)\Windows NT\SppExtComObj.exe'" /f
1⤵
- Process spawned unexpected child process
- Scheduled Task/Job: Scheduled Task
PID:2600

C:\Windows\system32\schtasks.exe
schtasks.exe /create /tn "SppExtComObj" /sc ONLOGON /tr "'C:\Program Files (x86)\Windows NT\SppExtComObj.exe'" /rl HIGHEST /f
1⤵
- Process spawned unexpected child process
- Scheduled Task/Job: Scheduled Task
PID:1352

C:\Windows\system32\schtasks.exe
schtasks.exe /create /tn "SppExtComObjS" /sc MINUTE /mo 11 /tr "'C:\Program Files (x86)\Windows NT\SppExtComObj.exe'" /rl HIGHEST /f
1⤵
- Process spawned unexpected child process
- Scheduled Task/Job: Scheduled Task
PID:4768

C:\Windows\system32\schtasks.exe
schtasks.exe /create /tn "explorere" /sc MINUTE /mo 6 /tr "'C:\Program Files\Google\explorer.exe'" /f
1⤵
- Process spawned unexpected child process
- Scheduled Task/Job: Scheduled Task
PID:3520

C:\Windows\system32\schtasks.exe
schtasks.exe /create /tn "explorer" /sc ONLOGON /tr "'C:\Program Files\Google\explorer.exe'" /rl HIGHEST /f
1⤵
- Process spawned unexpected child process
- Scheduled Task/Job: Scheduled Task
PID:3952

C:\Windows\system32\schtasks.exe
schtasks.exe /create /tn "explorere" /sc MINUTE /mo 12 /tr "'C:\Program Files\Google\explorer.exe'" /rl HIGHEST /f
1⤵
- Process spawned unexpected child process
- Scheduled Task/Job: Scheduled Task
PID:1632

C:\Windows\system32\schtasks.exe
schtasks.exe /create /tn "taskhostwt" /sc MINUTE /mo 6 /tr "'C:\Users\All Users\taskhostw.exe'" /f
1⤵
- Process spawned unexpected child process
- Scheduled Task/Job: Scheduled Task
PID:3204

C:\Windows\system32\schtasks.exe
schtasks.exe /create /tn "taskhostw" /sc ONLOGON /tr "'C:\Users\All Users\taskhostw.exe'" /rl HIGHEST /f
1⤵
- Process spawned unexpected child process
- Scheduled Task/Job: Scheduled Task
PID:3292

C:\Windows\system32\schtasks.exe
schtasks.exe /create /tn "taskhostwt" /sc MINUTE /mo 7 /tr "'C:\Users\All Users\taskhostw.exe'" /rl HIGHEST /f
1⤵
- Process spawned unexpected child process
- Scheduled Task/Job: Scheduled Task
PID:3772

C:\Windows\system32\schtasks.exe
schtasks.exe /create /tn "dllhostd" /sc MINUTE /mo 9 /tr "'C:\Windows\Panther\setup.exe\dllhost.exe'" /f
1⤵
- Process spawned unexpected child process
- Scheduled Task/Job: Scheduled Task
PID:2468

C:\Windows\system32\schtasks.exe
schtasks.exe /create /tn "dllhost" /sc ONLOGON /tr "'C:\Windows\Panther\setup.exe\dllhost.exe'" /rl HIGHEST /f
1⤵
- Process spawned unexpected child process
- Scheduled Task/Job: Scheduled Task
PID:4472

C:\Windows\system32\schtasks.exe
schtasks.exe /create /tn "dllhostd" /sc MINUTE /mo 6 /tr "'C:\Windows\Panther\setup.exe\dllhost.exe'" /rl HIGHEST /f
1⤵
- Process spawned unexpected child process
- Scheduled Task/Job: Scheduled Task
PID:1064

C:\Windows\system32\schtasks.exe
schtasks.exe /create /tn "smsss" /sc MINUTE /mo 5 /tr "'C:\Windows\Cursors\smss.exe'" /f
1⤵
- Process spawned unexpected child process
- Scheduled Task/Job: Scheduled Task
PID:1828

C:\Windows\system32\schtasks.exe
schtasks.exe /create /tn "smss" /sc ONLOGON /tr "'C:\Windows\Cursors\smss.exe'" /rl HIGHEST /f
1⤵
- Process spawned unexpected child process
- Scheduled Task/Job: Scheduled Task
PID:2408

C:\Windows\system32\schtasks.exe
schtasks.exe /create /tn "smsss" /sc MINUTE /mo 13 /tr "'C:\Windows\Cursors\smss.exe'" /rl HIGHEST /f
1⤵
- Process spawned unexpected child process
- Scheduled Task/Job: Scheduled Task
PID:2768

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

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

Replay Monitor

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Downloads

C:\Intorefmonitor\FYAEr71891wWlEwRPl694a2WBb.bat

Filesize
43B

MD5
f9c5334ad947ae66bd4fed8bc11f53ee

SHA1
7ecc21258d94c80734c84f694673aa57a451a687

SHA256
85d2427bbb43780533b8c1f5996c5812394b5031a6a53a7c57b4d549719a53b3

SHA512
a52b1b6d3014e1c020fb2b24017ee5e37cb5262d5f35d848eba3922200a4b635cf1d3210fc0a9c3a2a2fb95fff55a9af65b18f05fb35cc35c937b1119687af98

Download Submit
C:\Intorefmonitor\J0X6sOBXzJWwanFreLiD2W8Em.vbe

Filesize
217B

MD5
eaa6f8c17d55cba46969ec9649f820b2

SHA1
f1a9303fceaf4e490a00f4c6ae3187713ce92bc9

SHA256
aa29fb6573dd295352e772f13b1745eb28f5059a446529b3e041b3d8ba9c886a

SHA512
6c09560e1fb70109f8fb50d99426155724f4f2c514b93c33bd7e7c4bc0e485d5ad64f75c6ac379136449634be084013d2e69756a9fbc586b4e1a93b83cc4ff55

Download Submit
C:\Intorefmonitor\browserreviewcommon.exe

Filesize
828KB

MD5
8265325b8bc5a390c245be6ff1185f9f

SHA1
5702c7c52d636b2004284e316229868111cea5cd

SHA256
4297ecf6d4e2381583ebd5a23f41775b436c9dccc648d28010a7e1fc5198c281

SHA512
76a1ce3ae26bb3e0c417f1be32b51c366e83cf696d854de7874db4748d9ea2b3c68d2d95babd29d7630428dde164d1070ebc3ee9d6b29fcede735c6ca3c38f5a

Download Submit
C:\Users\Admin\AppData\Local\Temp\tAV1Y7tqnp.bat

Filesize
192B

MD5
dabfd7180d3e562ad13ba5f4bacbcad4

SHA1
760b5712c90019c56c1d038804ae293d7aa35f71

SHA256
51b1e1b2c30fb56c93e82ee8afd4d41ef139f92e49848ccb254a0bccb9d45ea1

SHA512
7e27a7aa59df71263c10fc04264e5a2bc41c49820498ba2691dac69cdffdbd7e0da3e413800de349beb86a643ef70913fdcfaa4a7a267953a10a431761cd54b2

Download Submit
memory/4208-12-0x00007FFC727F3000-0x00007FFC727F5000-memory.dmp

Filesize
8KB

Download
memory/4208-13-0x00000000003A0000-0x0000000000476000-memory.dmp

Filesize
856KB

Download

Analysis

Sharing

General

Malware Config

Signatures

Processes

Network

MITRE ATT&CK Enterprise v15

Replay Monitor

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Downloads