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 6 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	2740	2476	schtasks.exe	35
Parent C:\Windows\system32\wbem\wmiprvse.exe is not expected to spawn this process	2712	2476	schtasks.exe	35
Parent C:\Windows\system32\wbem\wmiprvse.exe is not expected to spawn this process	2836	2476	schtasks.exe	35
Parent C:\Windows\system32\wbem\wmiprvse.exe is not expected to spawn this process	1292	2476	schtasks.exe	35
Parent C:\Windows\system32\wbem\wmiprvse.exe is not expected to spawn this process	2624	2476	schtasks.exe	35
Parent C:\Windows\system32\wbem\wmiprvse.exe is not expected to spawn this process	2132	2476	schtasks.exe	35

DCRat payload 3 IoCs

Detects payload of DCRat, commonly dropped by NSIS installers.

rat

resource	yara_rule
behavioral1/files/0x0008000000016c3d-9.dat	dcrat
behavioral1/memory/1908-13-0x0000000000E10000-0x0000000000EE6000-memory.dmp	dcrat
behavioral1/memory/1520-25-0x00000000001B0000-0x0000000000286000-memory.dmp	dcrat

Executes dropped EXE 2 IoCs

pid	Process
1908	browserreviewcommon.exe
1520	lsass.exe

Loads dropped DLL 2 IoCs

pid	Process
2164	cmd.exe
2164	cmd.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

Scheduled Task/Job: Scheduled Task 1 TTPs 6 IoCs

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

persistence execution

Scheduled Task

T1053.005

pid	Process
2740	schtasks.exe
2712	schtasks.exe
2836	schtasks.exe
1292	schtasks.exe
2624	schtasks.exe
2132	schtasks.exe

Suspicious behavior: EnumeratesProcesses 10 IoCs

pid	Process
1908	browserreviewcommon.exe
1520	lsass.exe
1520	lsass.exe
1520	lsass.exe
1520	lsass.exe
1520	lsass.exe
1520	lsass.exe
1520	lsass.exe
1520	lsass.exe
1520	lsass.exe

Suspicious use of AdjustPrivilegeToken 2 IoCs

description	pid	Process
Token: SeDebugPrivilege	1908	browserreviewcommon.exe
Token: SeDebugPrivilege	1520	lsass.exe

Suspicious use of WriteProcessMemory 21 IoCs

description	pid	Process	procid_target
PID 2344 wrote to memory of 2480	2344	123.exe	31
PID 2344 wrote to memory of 2480	2344	123.exe	31
PID 2344 wrote to memory of 2480	2344	123.exe	31
PID 2344 wrote to memory of 2480	2344	123.exe	31
PID 2480 wrote to memory of 2164	2480	WScript.exe	32
PID 2480 wrote to memory of 2164	2480	WScript.exe	32
PID 2480 wrote to memory of 2164	2480	WScript.exe	32
PID 2480 wrote to memory of 2164	2480	WScript.exe	32
PID 2164 wrote to memory of 1908	2164	cmd.exe	34
PID 2164 wrote to memory of 1908	2164	cmd.exe	34
PID 2164 wrote to memory of 1908	2164	cmd.exe	34
PID 2164 wrote to memory of 1908	2164	cmd.exe	34
PID 1908 wrote to memory of 612	1908	browserreviewcommon.exe	42
PID 1908 wrote to memory of 612	1908	browserreviewcommon.exe	42
PID 1908 wrote to memory of 612	1908	browserreviewcommon.exe	42
PID 612 wrote to memory of 340	612	cmd.exe	44
PID 612 wrote to memory of 340	612	cmd.exe	44
PID 612 wrote to memory of 340	612	cmd.exe	44
PID 612 wrote to memory of 1520	612	cmd.exe	45
PID 612 wrote to memory of 1520	612	cmd.exe	45
PID 612 wrote to memory of 1520	612	cmd.exe	45

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⤵
- System Location Discovery: System Language Discovery
- Suspicious use of WriteProcessMemory
PID:2344
- C:\Windows\SysWOW64\WScript.exe
  "C:\Windows\System32\WScript.exe" "C:\Intorefmonitor\J0X6sOBXzJWwanFreLiD2W8Em.vbe"
  2⤵
  - System Location Discovery: System Language Discovery
  - Suspicious use of WriteProcessMemory
  PID:2480
- - C:\Windows\SysWOW64\cmd.exe
    cmd /c ""C:\Intorefmonitor\FYAEr71891wWlEwRPl694a2WBb.bat" "
    3⤵
    - Loads dropped DLL
    - System Location Discovery: System Language Discovery
    - Suspicious use of WriteProcessMemory
    PID:2164
  - - C:\Intorefmonitor\browserreviewcommon.exe
      "C:\Intorefmonitor\browserreviewcommon.exe"
      4⤵
      Executes dropped EXE
      Suspicious behavior: EnumeratesProcesses
      Suspicious use of AdjustPrivilegeToken
      Suspicious use of WriteProcessMemory
      PID:1908
    - - C:\Windows\System32\cmd.exe
        
        "C:\Windows\System32\cmd.exe" /C "C:\Users\Admin\AppData\Local\Temp\P2XacHOZcy.bat"
        5⤵
        Suspicious use of WriteProcessMemory
        
        PID:612
      - C:\Windows\system32\w32tm.exe
        
        w32tm /stripchart /computer:localhost /period:5 /dataonly /samples:2
        6⤵
        
        PID:340
      - C:\Recovery\1f276ee2-69f6-11ef-8b31-62cb582c238c\lsass.exe
        
        "C:\Recovery\1f276ee2-69f6-11ef-8b31-62cb582c238c\lsass.exe"
        6⤵
        Executes dropped EXE
        Suspicious behavior: EnumeratesProcesses
        Suspicious use of AdjustPrivilegeToken
        
        PID:1520

C:\Windows\system32\schtasks.exe
schtasks.exe /create /tn "lsassl" /sc MINUTE /mo 9 /tr "'C:\Recovery\1f276ee2-69f6-11ef-8b31-62cb582c238c\lsass.exe'" /f
1⤵
- Process spawned unexpected child process
- Scheduled Task/Job: Scheduled Task
PID:2740

C:\Windows\system32\schtasks.exe
schtasks.exe /create /tn "lsass" /sc ONLOGON /tr "'C:\Recovery\1f276ee2-69f6-11ef-8b31-62cb582c238c\lsass.exe'" /rl HIGHEST /f
1⤵
- Process spawned unexpected child process
- Scheduled Task/Job: Scheduled Task
PID:2712

C:\Windows\system32\schtasks.exe
schtasks.exe /create /tn "lsassl" /sc MINUTE /mo 10 /tr "'C:\Recovery\1f276ee2-69f6-11ef-8b31-62cb582c238c\lsass.exe'" /rl HIGHEST /f
1⤵
- Process spawned unexpected child process
- Scheduled Task/Job: Scheduled Task
PID:2836

C:\Windows\system32\schtasks.exe
schtasks.exe /create /tn "SystemS" /sc MINUTE /mo 7 /tr "'C:\MSOCache\All Users\{90140000-001A-0409-0000-0000000FF1CE}-C\System.exe'" /f
1⤵
- Process spawned unexpected child process
- Scheduled Task/Job: Scheduled Task
PID:1292

C:\Windows\system32\schtasks.exe
schtasks.exe /create /tn "System" /sc ONLOGON /tr "'C:\MSOCache\All Users\{90140000-001A-0409-0000-0000000FF1CE}-C\System.exe'" /rl HIGHEST /f
1⤵
- Process spawned unexpected child process
- Scheduled Task/Job: Scheduled Task
PID:2624

C:\Windows\system32\schtasks.exe
schtasks.exe /create /tn "SystemS" /sc MINUTE /mo 14 /tr "'C:\MSOCache\All Users\{90140000-001A-0409-0000-0000000FF1CE}-C\System.exe'" /rl HIGHEST /f
1⤵
- Process spawned unexpected child process
- Scheduled Task/Job: Scheduled Task
PID:2132

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

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:\Users\Admin\AppData\Local\Temp\P2XacHOZcy.bat

Filesize
223B

MD5
aa7d8bd47553a38087ee95ee10217f46

SHA1
b3914203ecd98b2978c7d7e1b08ad51838ad3e27

SHA256
00dc302f6284ac26ec2e1c4ec991a53c72c16669146c946ec3901d628cd97027

SHA512
af370b8c0348b80fa4d515f75520a1a366c26a873d1698f1b007e814e8c3872fb754de9fde8009c2e0f89794f7cd79f2a7f08bbe8262d7ac5f983cce6da1d87d

Download Submit
\Intorefmonitor\browserreviewcommon.exe

Filesize
828KB

MD5
8265325b8bc5a390c245be6ff1185f9f

SHA1
5702c7c52d636b2004284e316229868111cea5cd

SHA256
4297ecf6d4e2381583ebd5a23f41775b436c9dccc648d28010a7e1fc5198c281

SHA512
76a1ce3ae26bb3e0c417f1be32b51c366e83cf696d854de7874db4748d9ea2b3c68d2d95babd29d7630428dde164d1070ebc3ee9d6b29fcede735c6ca3c38f5a

Download Submit
memory/1520-25-0x00000000001B0000-0x0000000000286000-memory.dmp

Filesize
856KB

Download
memory/1908-13-0x0000000000E10000-0x0000000000EE6000-memory.dmp

Filesize
856KB

Download

Analysis

Sharing

General

Malware Config

Signatures

Processes

Network

MITRE ATT&CK Enterprise v15

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Downloads