dcrat | b712e3a5e5db6e7f7d6a629021e2dbecc51871adb0d2a8cad2c5d094f5c1d410

General

Target

aac41b74838379e24f8b5ca5e704fea42bc06eb158b460dde82e6e3029c14ee7.exe
Size

1.5MB
MD5

20b7f5d28ee98e5c43286823ea8cf1e6
SHA1

78ca9fcf1eb4f779d09271121f0c2fc6b74de2e8
SHA256

aac41b74838379e24f8b5ca5e704fea42bc06eb158b460dde82e6e3029c14ee7
SHA512

ae6c707fd71fb6af879ccb82da8955228e871d94ad8fdc81f3483956aefda85ca4bdb7b1604d68cf5709932eb26c95b435bce500811dd3e8558596fca87139aa
SSDEEP

24576:U2G/nvxW3Ww0tU5oiFd+IZhV5UVdoWpcCQD/nxsRGIE0Fc3q7UEE:UbA30U5oiZGV+5TD6RJFs8a

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 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	2560	2544	schtasks.exe	33
Parent C:\Windows\system32\wbem\wmiprvse.exe is not expected to spawn this process	2448	2544	schtasks.exe	33
Parent C:\Windows\system32\wbem\wmiprvse.exe is not expected to spawn this process	2476	2544	schtasks.exe	33
Parent C:\Windows\system32\wbem\wmiprvse.exe is not expected to spawn this process	2948	2544	schtasks.exe	33
Parent C:\Windows\system32\wbem\wmiprvse.exe is not expected to spawn this process	2944	2544	schtasks.exe	33
Parent C:\Windows\system32\wbem\wmiprvse.exe is not expected to spawn this process	236	2544	schtasks.exe	33
Parent C:\Windows\system32\wbem\wmiprvse.exe is not expected to spawn this process	440	2544	schtasks.exe	33
Parent C:\Windows\system32\wbem\wmiprvse.exe is not expected to spawn this process	2028	2544	schtasks.exe	33
Parent C:\Windows\system32\wbem\wmiprvse.exe is not expected to spawn this process	1692	2544	schtasks.exe	33
Parent C:\Windows\system32\wbem\wmiprvse.exe is not expected to spawn this process	836	2544	schtasks.exe	33
Parent C:\Windows\system32\wbem\wmiprvse.exe is not expected to spawn this process	2272	2544	schtasks.exe	33
Parent C:\Windows\system32\wbem\wmiprvse.exe is not expected to spawn this process	2348	2544	schtasks.exe	33

DCRat payload 3 IoCs

Detects payload of DCRat, commonly dropped by NSIS installers.

rat

resource	yara_rule
behavioral1/files/0x0007000000018bf3-9.dat	dcrat
behavioral1/memory/2728-13-0x0000000001020000-0x0000000001152000-memory.dmp	dcrat
behavioral1/memory/1756-31-0x00000000011A0000-0x00000000012D2000-memory.dmp	dcrat

Executes dropped EXE 2 IoCs

pid	Process
2728	Brokerdll.exe
1756	csrss.exe

Loads dropped DLL 2 IoCs

pid	Process
2876	cmd.exe
2876	cmd.exe

Drops file in Program Files directory 3 IoCs

description	ioc	Process
File created	C:\Program Files\Windows Media Player\Brokerdll.exe	Brokerdll.exe
File opened for modification	C:\Program Files\Windows Media Player\Brokerdll.exe	Brokerdll.exe
File created	C:\Program Files\Windows Media Player\f575e60b8b0de6	Brokerdll.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	cmd.exe
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	aac41b74838379e24f8b5ca5e704fea42bc06eb158b460dde82e6e3029c14ee7.exe
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	WScript.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
2028	schtasks.exe
836	schtasks.exe
2560	schtasks.exe
2948	schtasks.exe
2944	schtasks.exe
440	schtasks.exe
2272	schtasks.exe
2348	schtasks.exe
2448	schtasks.exe
2476	schtasks.exe
236	schtasks.exe
1692	schtasks.exe

Suspicious behavior: EnumeratesProcesses 4 IoCs

pid	Process
2728	Brokerdll.exe
2728	Brokerdll.exe
2728	Brokerdll.exe
1756	csrss.exe

Suspicious use of AdjustPrivilegeToken 2 IoCs

description	pid	Process
Token: SeDebugPrivilege	2728	Brokerdll.exe
Token: SeDebugPrivilege	1756	csrss.exe

Suspicious use of WriteProcessMemory 15 IoCs

description	pid	Process	procid_target
PID 1744 wrote to memory of 812	1744	aac41b74838379e24f8b5ca5e704fea42bc06eb158b460dde82e6e3029c14ee7.exe	29
PID 1744 wrote to memory of 812	1744	aac41b74838379e24f8b5ca5e704fea42bc06eb158b460dde82e6e3029c14ee7.exe	29
PID 1744 wrote to memory of 812	1744	aac41b74838379e24f8b5ca5e704fea42bc06eb158b460dde82e6e3029c14ee7.exe	29
PID 1744 wrote to memory of 812	1744	aac41b74838379e24f8b5ca5e704fea42bc06eb158b460dde82e6e3029c14ee7.exe	29
PID 812 wrote to memory of 2876	812	WScript.exe	30
PID 812 wrote to memory of 2876	812	WScript.exe	30
PID 812 wrote to memory of 2876	812	WScript.exe	30
PID 812 wrote to memory of 2876	812	WScript.exe	30
PID 2876 wrote to memory of 2728	2876	cmd.exe	32
PID 2876 wrote to memory of 2728	2876	cmd.exe	32
PID 2876 wrote to memory of 2728	2876	cmd.exe	32
PID 2876 wrote to memory of 2728	2876	cmd.exe	32
PID 2728 wrote to memory of 1756	2728	Brokerdll.exe	46
PID 2728 wrote to memory of 1756	2728	Brokerdll.exe	46
PID 2728 wrote to memory of 1756	2728	Brokerdll.exe	46

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\aac41b74838379e24f8b5ca5e704fea42bc06eb158b460dde82e6e3029c14ee7.exe
"C:\Users\Admin\AppData\Local\Temp\aac41b74838379e24f8b5ca5e704fea42bc06eb158b460dde82e6e3029c14ee7.exe"
1⤵
- System Location Discovery: System Language Discovery
- Suspicious use of WriteProcessMemory
PID:1744
- C:\Windows\SysWOW64\WScript.exe
  "C:\Windows\System32\WScript.exe" "C:\containerWebmonitorDll\T7oNlk2vHaQ8MXkSqmK2HufyoPSWwE.vbe"
  2⤵
  - System Location Discovery: System Language Discovery
  - Suspicious use of WriteProcessMemory
  PID:812
- - C:\Windows\SysWOW64\cmd.exe
    cmd /c ""C:\containerWebmonitorDll\UU3jqQ4vWPCbmzdnuhCfA2VrMpTm.bat" "
    3⤵
    - Loads dropped DLL
    - System Location Discovery: System Language Discovery
    - Suspicious use of WriteProcessMemory
    PID:2876
  - - C:\containerWebmonitorDll\Brokerdll.exe
      "C:\containerWebmonitorDll\Brokerdll.exe"
      4⤵
      Executes dropped EXE
      Drops file in Program Files directory
      Suspicious behavior: EnumeratesProcesses
      Suspicious use of AdjustPrivilegeToken
      Suspicious use of WriteProcessMemory
      PID:2728
    - - C:\containerWebmonitorDll\csrss.exe
        
        "C:\containerWebmonitorDll\csrss.exe"
        5⤵
        Executes dropped EXE
        Suspicious behavior: EnumeratesProcesses
        Suspicious use of AdjustPrivilegeToken
        
        PID:1756

C:\Windows\system32\schtasks.exe
schtasks.exe /create /tn "BrokerdllB" /sc MINUTE /mo 7 /tr "'C:\Program Files\Windows Media Player\Brokerdll.exe'" /f
1⤵
- Process spawned unexpected child process
- Scheduled Task/Job: Scheduled Task
PID:2560

C:\Windows\system32\schtasks.exe
schtasks.exe /create /tn "Brokerdll" /sc ONLOGON /tr "'C:\Program Files\Windows Media Player\Brokerdll.exe'" /rl HIGHEST /f
1⤵
- Process spawned unexpected child process
- Scheduled Task/Job: Scheduled Task
PID:2448

C:\Windows\system32\schtasks.exe
schtasks.exe /create /tn "BrokerdllB" /sc MINUTE /mo 8 /tr "'C:\Program Files\Windows Media Player\Brokerdll.exe'" /rl HIGHEST /f
1⤵
- Process spawned unexpected child process
- Scheduled Task/Job: Scheduled Task
PID:2476

C:\Windows\system32\schtasks.exe
schtasks.exe /create /tn "csrssc" /sc MINUTE /mo 11 /tr "'C:\containerWebmonitorDll\csrss.exe'" /f
1⤵
- Process spawned unexpected child process
- Scheduled Task/Job: Scheduled Task
PID:2948

C:\Windows\system32\schtasks.exe
schtasks.exe /create /tn "csrss" /sc ONLOGON /tr "'C:\containerWebmonitorDll\csrss.exe'" /rl HIGHEST /f
1⤵
- Process spawned unexpected child process
- Scheduled Task/Job: Scheduled Task
PID:2944

C:\Windows\system32\schtasks.exe
schtasks.exe /create /tn "csrssc" /sc MINUTE /mo 6 /tr "'C:\containerWebmonitorDll\csrss.exe'" /rl HIGHEST /f
1⤵
- Process spawned unexpected child process
- Scheduled Task/Job: Scheduled Task
PID:236

C:\Windows\system32\schtasks.exe
schtasks.exe /create /tn "spoolsvs" /sc MINUTE /mo 8 /tr "'C:\Recovery\3a99bb82-4e15-11ef-8354-cae67966b5f6\spoolsv.exe'" /f
1⤵
- Process spawned unexpected child process
- Scheduled Task/Job: Scheduled Task
PID:440

C:\Windows\system32\schtasks.exe
schtasks.exe /create /tn "spoolsv" /sc ONLOGON /tr "'C:\Recovery\3a99bb82-4e15-11ef-8354-cae67966b5f6\spoolsv.exe'" /rl HIGHEST /f
1⤵
- Process spawned unexpected child process
- Scheduled Task/Job: Scheduled Task
PID:2028

C:\Windows\system32\schtasks.exe
schtasks.exe /create /tn "spoolsvs" /sc MINUTE /mo 9 /tr "'C:\Recovery\3a99bb82-4e15-11ef-8354-cae67966b5f6\spoolsv.exe'" /rl HIGHEST /f
1⤵
- Process spawned unexpected child process
- Scheduled Task/Job: Scheduled Task
PID:1692

C:\Windows\system32\schtasks.exe
schtasks.exe /create /tn "lsml" /sc MINUTE /mo 9 /tr "'C:\containerWebmonitorDll\lsm.exe'" /f
1⤵
- Process spawned unexpected child process
- Scheduled Task/Job: Scheduled Task
PID:836

C:\Windows\system32\schtasks.exe
schtasks.exe /create /tn "lsm" /sc ONLOGON /tr "'C:\containerWebmonitorDll\lsm.exe'" /rl HIGHEST /f
1⤵
- Process spawned unexpected child process
- Scheduled Task/Job: Scheduled Task
PID:2272

C:\Windows\system32\schtasks.exe
schtasks.exe /create /tn "lsml" /sc MINUTE /mo 8 /tr "'C:\containerWebmonitorDll\lsm.exe'" /rl HIGHEST /f
1⤵
- Process spawned unexpected child process
- Scheduled Task/Job: Scheduled Task
PID:2348

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:\containerWebmonitorDll\T7oNlk2vHaQ8MXkSqmK2HufyoPSWwE.vbe

Filesize
227B

MD5
732083bb2600ac40ae76216b1be346a9

SHA1
706a692088170daeffc7eff189cdfd53d01bac76

SHA256
fb298a365d280de99d20ae5e2c6432045b7f5fa07b45a9b1ba67d8d4e136e52a

SHA512
250a377d5c7f7c21e1415e85b6042cca54cd4c1f855d6b780b19dfb01d192c1f2676095b8c3fba366c7683c824daf8376b1d4f8b49003e6113397f49de4421ef

Download Submit
C:\containerWebmonitorDll\UU3jqQ4vWPCbmzdnuhCfA2VrMpTm.bat

Filesize
41B

MD5
756eee59db5c306ed63519c4014b9284

SHA1
6adb232367169ac4bc01f3b4a0ed940df3420d94

SHA256
6957c8a2885868e6f828f6984ad998f8a58e19e21569c352342cde48f4dca4f7

SHA512
b54e3a1070e83664673950ab32fcf0da5dd1e06619425b94df8c7632aa5a9dfb2fb1c50a27949694c5887e59ef6dbc97a0a2f424abc400bca854df1f8e0c7e21

Download Submit
\containerWebmonitorDll\Brokerdll.exe

Filesize
1.2MB

MD5
67ae0d53416be7874e657ae8184bbcb6

SHA1
b2e8dc6da421ddcb65875515f52c16cccde24be8

SHA256
04602534388c779f47a66d164f25af60f34a2be16ea5f3f5c6a99ca909e142f7

SHA512
2ee417d1150c4e31cb3cb4c5d2c7ff3db6f81fba8c930e482baf16a45e66250f104dbcffc417afde7f244abe7acce315fc8833a999cadd7be3a934eb34abf2a5

Download Submit
memory/1756-31-0x00000000011A0000-0x00000000012D2000-memory.dmp

Filesize
1.2MB

Download
memory/2728-13-0x0000000001020000-0x0000000001152000-memory.dmp

Filesize
1.2MB

Download
memory/2728-14-0x00000000003C0000-0x00000000003DC000-memory.dmp

Filesize
112KB

Download
memory/2728-15-0x00000000003F0000-0x0000000000406000-memory.dmp

Filesize
88KB

Download
memory/2728-16-0x0000000000410000-0x000000000041C000-memory.dmp

Filesize
48KB

Download

Analysis

Sharing

General

Malware Config

Signatures

Processes

Network

MITRE ATT&CK Enterprise v15

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Downloads