dcrat | 36fce76e89c0c4e4798956b61abad0e5e28e0732763699ce3c5003518b643496

Analysis

max time kernel
121s
max time network
123s
platform
windows7_x64
resource
win7-20240903-en
resource tags

arch:x64arch:x86image:win7-20240903-enlocale:en-usos:windows7-x64system
submitted
06-12-2024 18:42

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General

Target

150550DF367F8D6334843DEEE8DE66A3.exe
Size

1.1MB
MD5

150550df367f8d6334843deee8de66a3
SHA1

8edcd7ff34e8c4a6cbc74fe57c831e5c400783f4
SHA256

36fce76e89c0c4e4798956b61abad0e5e28e0732763699ce3c5003518b643496
SHA512

427afc1255c109d47c1b879ba84c98225becd644cea03a4b926679381a73aeb6760bd974af558f667fd2588077ba701e8193a20c788bfd5a601dfa5f4712438c
SSDEEP

24576:U2G/nvxW3Ww0tWumqZzVuY4G+bGGnHkUeaC6qEKKH8:UbA30iyuY4GEHkZ2KF

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 30 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	2632	2584	schtasks.exe	32
Parent C:\Windows\system32\wbem\wmiprvse.exe is not expected to spawn this process	2700	2584	schtasks.exe	32
Parent C:\Windows\system32\wbem\wmiprvse.exe is not expected to spawn this process	2752	2584	schtasks.exe	32
Parent C:\Windows\system32\wbem\wmiprvse.exe is not expected to spawn this process	2624	2584	schtasks.exe	32
Parent C:\Windows\system32\wbem\wmiprvse.exe is not expected to spawn this process	2608	2584	schtasks.exe	32
Parent C:\Windows\system32\wbem\wmiprvse.exe is not expected to spawn this process	2760	2584	schtasks.exe	32
Parent C:\Windows\system32\wbem\wmiprvse.exe is not expected to spawn this process	2520	2584	schtasks.exe	32
Parent C:\Windows\system32\wbem\wmiprvse.exe is not expected to spawn this process	2628	2584	schtasks.exe	32
Parent C:\Windows\system32\wbem\wmiprvse.exe is not expected to spawn this process	2548	2584	schtasks.exe	32
Parent C:\Windows\system32\wbem\wmiprvse.exe is not expected to spawn this process	2508	2584	schtasks.exe	32
Parent C:\Windows\system32\wbem\wmiprvse.exe is not expected to spawn this process	2564	2584	schtasks.exe	32
Parent C:\Windows\system32\wbem\wmiprvse.exe is not expected to spawn this process	2912	2584	schtasks.exe	32
Parent C:\Windows\system32\wbem\wmiprvse.exe is not expected to spawn this process	2924	2584	schtasks.exe	32
Parent C:\Windows\system32\wbem\wmiprvse.exe is not expected to spawn this process	980	2584	schtasks.exe	32
Parent C:\Windows\system32\wbem\wmiprvse.exe is not expected to spawn this process	1816	2584	schtasks.exe	32
Parent C:\Windows\system32\wbem\wmiprvse.exe is not expected to spawn this process	2320	2584	schtasks.exe	32
Parent C:\Windows\system32\wbem\wmiprvse.exe is not expected to spawn this process	1740	2584	schtasks.exe	32
Parent C:\Windows\system32\wbem\wmiprvse.exe is not expected to spawn this process	2288	2584	schtasks.exe	32
Parent C:\Windows\system32\wbem\wmiprvse.exe is not expected to spawn this process	1784	2584	schtasks.exe	32
Parent C:\Windows\system32\wbem\wmiprvse.exe is not expected to spawn this process	2280	2584	schtasks.exe	32
Parent C:\Windows\system32\wbem\wmiprvse.exe is not expected to spawn this process	540	2584	schtasks.exe	32
Parent C:\Windows\system32\wbem\wmiprvse.exe is not expected to spawn this process	328	2584	schtasks.exe	32
Parent C:\Windows\system32\wbem\wmiprvse.exe is not expected to spawn this process	372	2584	schtasks.exe	32
Parent C:\Windows\system32\wbem\wmiprvse.exe is not expected to spawn this process	1296	2584	schtasks.exe	32
Parent C:\Windows\system32\wbem\wmiprvse.exe is not expected to spawn this process	1416	2584	schtasks.exe	32
Parent C:\Windows\system32\wbem\wmiprvse.exe is not expected to spawn this process	1624	2584	schtasks.exe	32
Parent C:\Windows\system32\wbem\wmiprvse.exe is not expected to spawn this process	2720	2584	schtasks.exe	32
Parent C:\Windows\system32\wbem\wmiprvse.exe is not expected to spawn this process	2732	2584	schtasks.exe	32
Parent C:\Windows\system32\wbem\wmiprvse.exe is not expected to spawn this process	3016	2584	schtasks.exe	32
Parent C:\Windows\system32\wbem\wmiprvse.exe is not expected to spawn this process	2200	2584	schtasks.exe	32

DCRat payload 3 IoCs

Detects payload of DCRat, commonly dropped by NSIS installers.

rat

resource	yara_rule
behavioral1/files/0x0008000000015d2e-12.dat	dcrat
behavioral1/memory/2140-13-0x0000000000290000-0x0000000000366000-memory.dmp	dcrat
behavioral1/memory/2800-40-0x0000000001130000-0x0000000001206000-memory.dmp	dcrat

Executes dropped EXE 2 IoCs

pid	Process
2140	blockport.exe
2800	audiodg.exe

Loads dropped DLL 2 IoCs

pid	Process
2576	cmd.exe
2576	cmd.exe

Drops file in Windows directory 3 IoCs

description	ioc	Process
File created	C:\Windows\RemotePackages\winlogon.exe	blockport.exe
File opened for modification	C:\Windows\RemotePackages\winlogon.exe	blockport.exe
File created	C:\Windows\RemotePackages\cc11b995f2a76d	blockport.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	150550DF367F8D6334843DEEE8DE66A3.exe
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	WScript.exe

Scheduled Task/Job: Scheduled Task 1 TTPs 30 IoCs

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

persistence execution

Scheduled Task

T1053.005

pid	Process
372	schtasks.exe
2912	schtasks.exe
1816	schtasks.exe
2288	schtasks.exe
2608	schtasks.exe
2628	schtasks.exe
980	schtasks.exe
2732	schtasks.exe
1740	schtasks.exe
1416	schtasks.exe
2752	schtasks.exe
2508	schtasks.exe
2564	schtasks.exe
2280	schtasks.exe
540	schtasks.exe
1624	schtasks.exe
3016	schtasks.exe
2632	schtasks.exe
2760	schtasks.exe
2200	schtasks.exe
1296	schtasks.exe
2720	schtasks.exe
2520	schtasks.exe
2548	schtasks.exe
2924	schtasks.exe
2320	schtasks.exe
328	schtasks.exe
2700	schtasks.exe
2624	schtasks.exe
1784	schtasks.exe

Suspicious behavior: EnumeratesProcesses 2 IoCs

pid	Process
2140	blockport.exe
2800	audiodg.exe

Suspicious use of AdjustPrivilegeToken 2 IoCs

description	pid	Process
Token: SeDebugPrivilege	2140	blockport.exe
Token: SeDebugPrivilege	2800	audiodg.exe

Suspicious use of WriteProcessMemory 15 IoCs

description	pid	Process	procid_target
PID 2828 wrote to memory of 288	2828	150550DF367F8D6334843DEEE8DE66A3.exe	28
PID 2828 wrote to memory of 288	2828	150550DF367F8D6334843DEEE8DE66A3.exe	28
PID 2828 wrote to memory of 288	2828	150550DF367F8D6334843DEEE8DE66A3.exe	28
PID 2828 wrote to memory of 288	2828	150550DF367F8D6334843DEEE8DE66A3.exe	28
PID 288 wrote to memory of 2576	288	WScript.exe	29
PID 288 wrote to memory of 2576	288	WScript.exe	29
PID 288 wrote to memory of 2576	288	WScript.exe	29
PID 288 wrote to memory of 2576	288	WScript.exe	29
PID 2576 wrote to memory of 2140	2576	cmd.exe	31
PID 2576 wrote to memory of 2140	2576	cmd.exe	31
PID 2576 wrote to memory of 2140	2576	cmd.exe	31
PID 2576 wrote to memory of 2140	2576	cmd.exe	31
PID 2140 wrote to memory of 2800	2140	blockport.exe	63
PID 2140 wrote to memory of 2800	2140	blockport.exe	63
PID 2140 wrote to memory of 2800	2140	blockport.exe	63

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\150550DF367F8D6334843DEEE8DE66A3.exe
"C:\Users\Admin\AppData\Local\Temp\150550DF367F8D6334843DEEE8DE66A3.exe"
1⤵
- System Location Discovery: System Language Discovery
- Suspicious use of WriteProcessMemory
PID:2828
- C:\Windows\SysWOW64\WScript.exe
  "C:\Windows\System32\WScript.exe" "C:\FontrefPerfmonitor\C7WmfIuC8zQxx.vbe"
  2⤵
  - System Location Discovery: System Language Discovery
  - Suspicious use of WriteProcessMemory
  PID:288
- - C:\Windows\SysWOW64\cmd.exe
    cmd /c ""C:\FontrefPerfmonitor\6xajXYt4OYp.bat" "
    3⤵
    - Loads dropped DLL
    - System Location Discovery: System Language Discovery
    - Suspicious use of WriteProcessMemory
    PID:2576
  - - C:\FontrefPerfmonitor\blockport.exe
      "C:\FontrefPerfmonitor\blockport.exe"
      4⤵
      Executes dropped EXE
      Drops file in Windows directory
      Suspicious behavior: EnumeratesProcesses
      Suspicious use of AdjustPrivilegeToken
      Suspicious use of WriteProcessMemory
      PID:2140
    - - C:\FontrefPerfmonitor\audiodg.exe
        
        "C:\FontrefPerfmonitor\audiodg.exe"
        5⤵
        Executes dropped EXE
        Suspicious behavior: EnumeratesProcesses
        Suspicious use of AdjustPrivilegeToken
        
        PID:2800

C:\Windows\system32\schtasks.exe
schtasks.exe /create /tn "winlogonw" /sc MINUTE /mo 11 /tr "'C:\Windows\RemotePackages\winlogon.exe'" /f
1⤵
- Process spawned unexpected child process
- Scheduled Task/Job: Scheduled Task
PID:2632

C:\Windows\system32\schtasks.exe
schtasks.exe /create /tn "winlogon" /sc ONLOGON /tr "'C:\Windows\RemotePackages\winlogon.exe'" /rl HIGHEST /f
1⤵
- Process spawned unexpected child process
- Scheduled Task/Job: Scheduled Task
PID:2700

C:\Windows\system32\schtasks.exe
schtasks.exe /create /tn "winlogonw" /sc MINUTE /mo 6 /tr "'C:\Windows\RemotePackages\winlogon.exe'" /rl HIGHEST /f
1⤵
- Process spawned unexpected child process
- Scheduled Task/Job: Scheduled Task
PID:2752

C:\Windows\system32\schtasks.exe
schtasks.exe /create /tn "servicess" /sc MINUTE /mo 6 /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:2624

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:2608

C:\Windows\system32\schtasks.exe
schtasks.exe /create /tn "servicess" /sc MINUTE /mo 6 /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:2760

C:\Windows\system32\schtasks.exe
schtasks.exe /create /tn "audiodga" /sc MINUTE /mo 5 /tr "'C:\FontrefPerfmonitor\audiodg.exe'" /f
1⤵
- Process spawned unexpected child process
- Scheduled Task/Job: Scheduled Task
PID:2520

C:\Windows\system32\schtasks.exe
schtasks.exe /create /tn "audiodg" /sc ONLOGON /tr "'C:\FontrefPerfmonitor\audiodg.exe'" /rl HIGHEST /f
1⤵
- Process spawned unexpected child process
- Scheduled Task/Job: Scheduled Task
PID:2628

C:\Windows\system32\schtasks.exe
schtasks.exe /create /tn "audiodga" /sc MINUTE /mo 13 /tr "'C:\FontrefPerfmonitor\audiodg.exe'" /rl HIGHEST /f
1⤵
- Process spawned unexpected child process
- Scheduled Task/Job: Scheduled Task
PID:2548

C:\Windows\system32\schtasks.exe
schtasks.exe /create /tn "IdleI" /sc MINUTE /mo 14 /tr "'C:\FontrefPerfmonitor\Idle.exe'" /f
1⤵
- Process spawned unexpected child process
- Scheduled Task/Job: Scheduled Task
PID:2508

C:\Windows\system32\schtasks.exe
schtasks.exe /create /tn "Idle" /sc ONLOGON /tr "'C:\FontrefPerfmonitor\Idle.exe'" /rl HIGHEST /f
1⤵
- Process spawned unexpected child process
- Scheduled Task/Job: Scheduled Task
PID:2564

C:\Windows\system32\schtasks.exe
schtasks.exe /create /tn "IdleI" /sc MINUTE /mo 9 /tr "'C:\FontrefPerfmonitor\Idle.exe'" /rl HIGHEST /f
1⤵
- Process spawned unexpected child process
- Scheduled Task/Job: Scheduled Task
PID:2912

C:\Windows\system32\schtasks.exe
schtasks.exe /create /tn "wininitw" /sc MINUTE /mo 12 /tr "'C:\Recovery\1b8b1de2-69f6-11ef-9774-62cb582c238c\wininit.exe'" /f
1⤵
- Process spawned unexpected child process
- Scheduled Task/Job: Scheduled Task
PID:2924

C:\Windows\system32\schtasks.exe
schtasks.exe /create /tn "wininit" /sc ONLOGON /tr "'C:\Recovery\1b8b1de2-69f6-11ef-9774-62cb582c238c\wininit.exe'" /rl HIGHEST /f
1⤵
- Process spawned unexpected child process
- Scheduled Task/Job: Scheduled Task
PID:980

C:\Windows\system32\schtasks.exe
schtasks.exe /create /tn "wininitw" /sc MINUTE /mo 14 /tr "'C:\Recovery\1b8b1de2-69f6-11ef-9774-62cb582c238c\wininit.exe'" /rl HIGHEST /f
1⤵
- Process spawned unexpected child process
- Scheduled Task/Job: Scheduled Task
PID:1816

C:\Windows\system32\schtasks.exe
schtasks.exe /create /tn "smsss" /sc MINUTE /mo 9 /tr "'C:\Recovery\1b8b1de2-69f6-11ef-9774-62cb582c238c\smss.exe'" /f
1⤵
- Process spawned unexpected child process
- Scheduled Task/Job: Scheduled Task
PID:2320

C:\Windows\system32\schtasks.exe
schtasks.exe /create /tn "smss" /sc ONLOGON /tr "'C:\Recovery\1b8b1de2-69f6-11ef-9774-62cb582c238c\smss.exe'" /rl HIGHEST /f
1⤵
- Process spawned unexpected child process
- Scheduled Task/Job: Scheduled Task
PID:1740

C:\Windows\system32\schtasks.exe
schtasks.exe /create /tn "smsss" /sc MINUTE /mo 14 /tr "'C:\Recovery\1b8b1de2-69f6-11ef-9774-62cb582c238c\smss.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 "audiodga" /sc MINUTE /mo 7 /tr "'C:\MSOCache\All Users\{90140000-0044-0409-0000-0000000FF1CE}-C\audiodg.exe'" /f
1⤵
- Process spawned unexpected child process
- Scheduled Task/Job: Scheduled Task
PID:1784

C:\Windows\system32\schtasks.exe
schtasks.exe /create /tn "audiodg" /sc ONLOGON /tr "'C:\MSOCache\All Users\{90140000-0044-0409-0000-0000000FF1CE}-C\audiodg.exe'" /rl HIGHEST /f
1⤵
- Process spawned unexpected child process
- Scheduled Task/Job: Scheduled Task
PID:2280

C:\Windows\system32\schtasks.exe
schtasks.exe /create /tn "audiodga" /sc MINUTE /mo 14 /tr "'C:\MSOCache\All Users\{90140000-0044-0409-0000-0000000FF1CE}-C\audiodg.exe'" /rl HIGHEST /f
1⤵
- Process spawned unexpected child process
- Scheduled Task/Job: Scheduled Task
PID:540

C:\Windows\system32\schtasks.exe
schtasks.exe /create /tn "blockportb" /sc MINUTE /mo 11 /tr "'C:\MSOCache\All Users\{90140000-002C-0409-0000-0000000FF1CE}-C\Proof.en\blockport.exe'" /f
1⤵
- Process spawned unexpected child process
- Scheduled Task/Job: Scheduled Task
PID:328

C:\Windows\system32\schtasks.exe
schtasks.exe /create /tn "blockport" /sc ONLOGON /tr "'C:\MSOCache\All Users\{90140000-002C-0409-0000-0000000FF1CE}-C\Proof.en\blockport.exe'" /rl HIGHEST /f
1⤵
- Process spawned unexpected child process
- Scheduled Task/Job: Scheduled Task
PID:372

C:\Windows\system32\schtasks.exe
schtasks.exe /create /tn "blockportb" /sc MINUTE /mo 10 /tr "'C:\MSOCache\All Users\{90140000-002C-0409-0000-0000000FF1CE}-C\Proof.en\blockport.exe'" /rl HIGHEST /f
1⤵
- Process spawned unexpected child process
- Scheduled Task/Job: Scheduled Task
PID:1296

C:\Windows\system32\schtasks.exe
schtasks.exe /create /tn "SystemS" /sc MINUTE /mo 8 /tr "'C:\Recovery\1b8b1de2-69f6-11ef-9774-62cb582c238c\System.exe'" /f
1⤵
- Process spawned unexpected child process
- Scheduled Task/Job: Scheduled Task
PID:1416

C:\Windows\system32\schtasks.exe
schtasks.exe /create /tn "System" /sc ONLOGON /tr "'C:\Recovery\1b8b1de2-69f6-11ef-9774-62cb582c238c\System.exe'" /rl HIGHEST /f
1⤵
- Process spawned unexpected child process
- Scheduled Task/Job: Scheduled Task
PID:1624

C:\Windows\system32\schtasks.exe
schtasks.exe /create /tn "SystemS" /sc MINUTE /mo 6 /tr "'C:\Recovery\1b8b1de2-69f6-11ef-9774-62cb582c238c\System.exe'" /rl HIGHEST /f
1⤵
- Process spawned unexpected child process
- Scheduled Task/Job: Scheduled Task
PID:2720

C:\Windows\system32\schtasks.exe
schtasks.exe /create /tn "blockportb" /sc MINUTE /mo 5 /tr "'C:\Users\Public\Desktop\blockport.exe'" /f
1⤵
- Process spawned unexpected child process
- Scheduled Task/Job: Scheduled Task
PID:2732

C:\Windows\system32\schtasks.exe
schtasks.exe /create /tn "blockport" /sc ONLOGON /tr "'C:\Users\Public\Desktop\blockport.exe'" /rl HIGHEST /f
1⤵
- Process spawned unexpected child process
- Scheduled Task/Job: Scheduled Task
PID:3016

C:\Windows\system32\schtasks.exe
schtasks.exe /create /tn "blockportb" /sc MINUTE /mo 12 /tr "'C:\Users\Public\Desktop\blockport.exe'" /rl HIGHEST /f
1⤵
- Process spawned unexpected child process
- Scheduled Task/Job: Scheduled Task
PID:2200

Network

MITRE ATT&CK Enterprise v15

Reconnaissance

Resource Development

Initial Access

Execution

Scheduled Task/Job

T1053

Scheduled Task

T1053.005

Persistence

Scheduled Task/Job

T1053

Scheduled Task

T1053.005

Privilege Escalation

Scheduled Task/Job

T1053

Scheduled Task

T1053.005

Defense Evasion

Credential Access

Discovery

Query Registry

T1012

System Information Discovery

T1082

System Location Discovery

T1614

System Language Discovery

T1614.001

Lateral Movement

Collection

Command and Control

Exfiltration

Impact

Replay Monitor

Loading Replay Monitor...

Downloads

C:\FontrefPerfmonitor\6xajXYt4OYp.bat

Filesize
37B

MD5
ce8d79d29a7f61ae455fbd0c51c15979

SHA1
bf8b31f3c60f4476bd8d4a332349fa44d207cfcd

SHA256
0282418c33a1d8ffd54f1bfd91c9ba3a5a9dcd94f8010cdb4ac6288b8b6e40a3

SHA512
f6b6ee7b1a1b6cebcce206195e90914022bb4c462c670e8f86f282df639b30dd75dec2e10e450162f20a58460fa19da9397c577ec108f7cca3bcb09137964f07

Download Submit
C:\FontrefPerfmonitor\C7WmfIuC8zQxx.vbe

Filesize
206B

MD5
3db2d6374a93b64353f37f61b091fa26

SHA1
94bf44c5b3687ada88a193b97ecbf9ff50350f65

SHA256
3b1c7f9549b2d3a4c9053f5d17b85388828351633b827849a12056bfdc4db0b7

SHA512
10edee575fb1c8c3b7769c66898b2164eb9c4bcda85ffdac55bc674b1692bffd4537eb336dc1d599dae50b16efe0382a568175f2c2a88eebd676a3bd55642e6d

Download Submit
C:\FontrefPerfmonitor\blockport.exe

Filesize
829KB

MD5
78a0654a256451e953d47049aaa60200

SHA1
85eba2ba3f585a889380841c991937448ba61066

SHA256
271009f132fc388837832a08962ff48c1e76372e047b31cce3db4ad047746855

SHA512
71cd1ddf7defc16a65db41aa0f93c55690e7c0dbbee04df8bc7efcffa251c9bbbeb6a471e02c621fc1767c19861d787d53bddfdab36d57d081cf875348b636b3

Download Submit
memory/2140-13-0x0000000000290000-0x0000000000366000-memory.dmp

Filesize
856KB

Download
memory/2800-40-0x0000000001130000-0x0000000001206000-memory.dmp

Filesize
856KB

Download