dcrat | 714c3946e5b2691b37a20d47af5323e96e6d1ecc9976f9df841f1d5674d44b03

General

Target

Nursultan-Alpha-main/NursultanAlpha.exe
Size

1.1MB
MD5

04d47663369ae93c8a2325d1fdafd7da
SHA1

d47262b1d1f8d938e44e98d96fbba35233166b53
SHA256

11b323227ec42ebc937299ac946582c13253b8a707c371adeadd225ec14f2eee
SHA512

78896538afd82ef2fe524502456510b3fc5dd0819bee92aaf0d002231b8bd11beee59f3a78d1bbbf2a33e6ab613f1b431cbf26fe8733b6ac70b69b2a47e92e1f
SSDEEP

24576:S2G/nvxW3Wu0Toe7NtsNN4rnw4P1DtV5ffUAU0X:SbA3G8ehWGH5T

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	3032	2124	schtasks.exe	81
Parent C:\Windows\system32\wbem\wmiprvse.exe is not expected to spawn this process	2948	2124	schtasks.exe	81
Parent C:\Windows\system32\wbem\wmiprvse.exe is not expected to spawn this process	3320	2124	schtasks.exe	81
Parent C:\Windows\system32\wbem\wmiprvse.exe is not expected to spawn this process	2720	2124	schtasks.exe	81
Parent C:\Windows\system32\wbem\wmiprvse.exe is not expected to spawn this process	460	2124	schtasks.exe	81
Parent C:\Windows\system32\wbem\wmiprvse.exe is not expected to spawn this process	1116	2124	schtasks.exe	81

DCRat payload 2 IoCs

Detects payload of DCRat, commonly dropped by NSIS installers.

rat

resource	yara_rule
behavioral3/files/0x001900000002aae3-10.dat	dcrat
behavioral3/memory/3828-13-0x0000000000DA0000-0x0000000000E76000-memory.dmp	dcrat

Executes dropped EXE 6 IoCs

pid	Process
3828	ServerperfDhcp.exe
3744	Idle.exe
3828	Idle.exe
4688	sihost.exe
884	Idle.exe
828	Idle.exe

Drops file in Program Files directory 2 IoCs

description	ioc	Process
File created	C:\Program Files (x86)\Mozilla Maintenance Service\logs\Idle.exe	ServerperfDhcp.exe
File created	C:\Program Files (x86)\Mozilla Maintenance Service\logs\6ccacd8608530f	ServerperfDhcp.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	NursultanAlpha.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 1 IoCs

description	ioc	Process
Key created	\REGISTRY\USER\S-1-5-21-2584844841-1405471295-1760131749-1000_Classes\Local Settings	NursultanAlpha.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
3032	schtasks.exe
2948	schtasks.exe
3320	schtasks.exe
2720	schtasks.exe
460	schtasks.exe
1116	schtasks.exe

Suspicious behavior: EnumeratesProcesses 6 IoCs

pid	Process
3828	ServerperfDhcp.exe
3744	Idle.exe
3828	Idle.exe
4688	sihost.exe
884	Idle.exe
828	Idle.exe

Suspicious use of AdjustPrivilegeToken 6 IoCs

description	pid	Process
Token: SeDebugPrivilege	3828	ServerperfDhcp.exe
Token: SeDebugPrivilege	3744	Idle.exe
Token: SeDebugPrivilege	3828	Idle.exe
Token: SeDebugPrivilege	4688	sihost.exe
Token: SeDebugPrivilege	884	Idle.exe
Token: SeDebugPrivilege	828	Idle.exe

Suspicious use of WriteProcessMemory 10 IoCs

description	pid	Process	procid_target
PID 580 wrote to memory of 4504	580	NursultanAlpha.exe	77
PID 580 wrote to memory of 4504	580	NursultanAlpha.exe	77
PID 580 wrote to memory of 4504	580	NursultanAlpha.exe	77
PID 4504 wrote to memory of 3512	4504	WScript.exe	78
PID 4504 wrote to memory of 3512	4504	WScript.exe	78
PID 4504 wrote to memory of 3512	4504	WScript.exe	78
PID 3512 wrote to memory of 3828	3512	cmd.exe	80
PID 3512 wrote to memory of 3828	3512	cmd.exe	80
PID 3828 wrote to memory of 3744	3828	ServerperfDhcp.exe	88
PID 3828 wrote to memory of 3744	3828	ServerperfDhcp.exe	88

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\Nursultan-Alpha-main\NursultanAlpha.exe
"C:\Users\Admin\AppData\Local\Temp\Nursultan-Alpha-main\NursultanAlpha.exe"
1⤵
- System Location Discovery: System Language Discovery
- Modifies registry class
- Suspicious use of WriteProcessMemory
PID:580
- C:\Windows\SysWOW64\WScript.exe
  "C:\Windows\System32\WScript.exe" "C:\bridgeReviewintoCommon\q48d35.vbe"
  2⤵
  - System Location Discovery: System Language Discovery
  - Suspicious use of WriteProcessMemory
  PID:4504
- - C:\Windows\SysWOW64\cmd.exe
    C:\Windows\system32\cmd.exe /c ""C:\bridgeReviewintoCommon\KPrICBKXTXtcR2zQA74oF3h.bat" "
    3⤵
    - System Location Discovery: System Language Discovery
    - Suspicious use of WriteProcessMemory
    PID:3512
  - - C:\bridgeReviewintoCommon\ServerperfDhcp.exe
      "C:\bridgeReviewintoCommon\ServerperfDhcp.exe"
      4⤵
      Executes dropped EXE
      Drops file in Program Files directory
      Suspicious behavior: EnumeratesProcesses
      Suspicious use of AdjustPrivilegeToken
      Suspicious use of WriteProcessMemory
      PID:3828
    - - C:\Program Files (x86)\Mozilla Maintenance Service\logs\Idle.exe
        
        "C:\Program Files (x86)\Mozilla Maintenance Service\logs\Idle.exe"
        5⤵
        Executes dropped EXE
        Suspicious behavior: EnumeratesProcesses
        Suspicious use of AdjustPrivilegeToken
        
        PID:3744

C:\Windows\system32\schtasks.exe
schtasks.exe /create /tn "sihosts" /sc MINUTE /mo 11 /tr "'C:\Recovery\WindowsRE\sihost.exe'" /f
1⤵
- Process spawned unexpected child process
- Scheduled Task/Job: Scheduled Task
PID:3032

C:\Windows\system32\schtasks.exe
schtasks.exe /create /tn "sihost" /sc ONLOGON /tr "'C:\Recovery\WindowsRE\sihost.exe'" /rl HIGHEST /f
1⤵
- Process spawned unexpected child process
- Scheduled Task/Job: Scheduled Task
PID:2948

C:\Windows\system32\schtasks.exe
schtasks.exe /create /tn "sihosts" /sc MINUTE /mo 11 /tr "'C:\Recovery\WindowsRE\sihost.exe'" /rl HIGHEST /f
1⤵
- Process spawned unexpected child process
- Scheduled Task/Job: Scheduled Task
PID:3320

C:\Windows\system32\schtasks.exe
schtasks.exe /create /tn "IdleI" /sc MINUTE /mo 5 /tr "'C:\Program Files (x86)\Mozilla Maintenance Service\logs\Idle.exe'" /f
1⤵
- Process spawned unexpected child process
- Scheduled Task/Job: Scheduled Task
PID:2720

C:\Windows\system32\schtasks.exe
schtasks.exe /create /tn "Idle" /sc ONLOGON /tr "'C:\Program Files (x86)\Mozilla Maintenance Service\logs\Idle.exe'" /rl HIGHEST /f
1⤵
- Process spawned unexpected child process
- Scheduled Task/Job: Scheduled Task
PID:460

C:\Windows\system32\schtasks.exe
schtasks.exe /create /tn "IdleI" /sc MINUTE /mo 6 /tr "'C:\Program Files (x86)\Mozilla Maintenance Service\logs\Idle.exe'" /rl HIGHEST /f
1⤵
- Process spawned unexpected child process
- Scheduled Task/Job: Scheduled Task
PID:1116

C:\Program Files (x86)\Mozilla Maintenance Service\logs\Idle.exe
"C:\Program Files (x86)\Mozilla Maintenance Service\logs\Idle.exe"
1⤵
- Executes dropped EXE
- Suspicious behavior: EnumeratesProcesses
- Suspicious use of AdjustPrivilegeToken
PID:3828

C:\Recovery\WindowsRE\sihost.exe
C:\Recovery\WindowsRE\sihost.exe
1⤵
- Executes dropped EXE
- Suspicious behavior: EnumeratesProcesses
- Suspicious use of AdjustPrivilegeToken
PID:4688

C:\Program Files (x86)\Mozilla Maintenance Service\logs\Idle.exe
"C:\Program Files (x86)\Mozilla Maintenance Service\logs\Idle.exe"
1⤵
- Executes dropped EXE
- Suspicious behavior: EnumeratesProcesses
- Suspicious use of AdjustPrivilegeToken
PID:884

C:\Program Files (x86)\Mozilla Maintenance Service\logs\Idle.exe
"C:\Program Files (x86)\Mozilla Maintenance Service\logs\Idle.exe"
1⤵
- Executes dropped EXE
- Suspicious behavior: EnumeratesProcesses
- Suspicious use of AdjustPrivilegeToken
PID:828

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\Microsoft\CLR_v4.0\UsageLogs\Idle.exe.log

Filesize
1KB

MD5
b4e91d2e5f40d5e2586a86cf3bb4df24

SHA1
31920b3a41aa4400d4a0230a7622848789b38672

SHA256
5d8af3c7519874ed42a0d74ee559ae30d9cc6930aef213079347e2b47092c210

SHA512
968751b79a98961f145de48d425ea820fd1875bae79a725adf35fc8f4706c103ee0c7babd4838166d8a0dda9fbce3728c0265a04c4b37f335ec4eaa110a2b319

Download Submit
C:\bridgeReviewintoCommon\KPrICBKXTXtcR2zQA74oF3h.bat

Filesize
46B

MD5
e41e1eaeb38aaaf5f6faf47d84758997

SHA1
36a485ab4eed2b99b85975909b5a3e050c3e6477

SHA256
29cb59c43d4a211ecba7d832c97c54a8c546bcc55d7df79ba1a4b6f227ecb404

SHA512
9218604ee28e76dc8528d4e1e70382bafbc028c97e39e95428ad62a92481e8ed46358630b535183fd35db7e91be8224ae78bfdb7de1ba862b4d523b2acad3c37

Download Submit
C:\bridgeReviewintoCommon\ServerperfDhcp.exe

Filesize
826KB

MD5
e2431fe3e9df46296c5172812bf43714

SHA1
d10efe8c25dc94b8f03deb224a321b93b30d0689

SHA256
c98b9c9410ff7194e6c06f5c697dbf2ce1a7dfddb022c44cf549ca348155bc58

SHA512
73e0786d5eb595c413155b00806d972d01a626e6a95958f270e5d4ffba5cbf73f6b7370a9af30f0bbaad974ce00dc2722634978e30593e6b71e5ebda983f612d

Download Submit
C:\bridgeReviewintoCommon\q48d35.vbe

Filesize
223B

MD5
5adff5d24c943847d902dd7d8f4c8a76

SHA1
4f18d31eb01bcbf1b1d48580ce544a2f85073f69

SHA256
590143e99e94677b9194f9c4ac1e9a820de37b1a9d4ba9689c0cddb315877808

SHA512
908484d614e89b1c3df9c2dd1847f42da64cb4a8cf6e47535325591f7d9bb414c7caf7d93e88d49d048c34b506f5f8f8c3ddaeab38a8a689880baa0b7389bde2

Download Submit
memory/3828-12-0x00007FFEE8773000-0x00007FFEE8775000-memory.dmp

Filesize
8KB

Download
memory/3828-13-0x0000000000DA0000-0x0000000000E76000-memory.dmp

Filesize
856KB

Download

Analysis

Sharing

General

Malware Config

Signatures

Processes

Network

MITRE ATT&CK Enterprise v15

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Downloads