dcrat | 08acc4229c4d8424570ee93f20f7c60a0e9e0605f7dc8594d14d52209b72ce00

General

Target

f4787944e95596ad1847910ce4180a20.exe
Size

942KB
MD5

f4787944e95596ad1847910ce4180a20
SHA1

f6ec2109ff3f3985ee6f73d0cf680343a90c8b2b
SHA256

08acc4229c4d8424570ee93f20f7c60a0e9e0605f7dc8594d14d52209b72ce00
SHA512

5466b793806093f291a0712846510c3573654bb7d0ded3b9f2a91a0238bd14ae4926fb1f1111a62b1c4e570f9ece54c2019c16c60b9c1af145b67ef9607e894b

Score

10^/10

dcrat infostealer rat spyware stealer

Malware Config

Signatures

DcRat
DarkCrystal(DC) is a new .NET RAT active since June 2019 capable of loading additional plugins.
rat infostealer dcrat

DCRat Payload 4 IoCs

Detects payload of DCRat, commonly dropped by NSIS installers.

rat

resource	yara_rule
behavioral2/files/0x00020000000152a3-7.dat	dcrat
behavioral2/files/0x00020000000152a3-8.dat	dcrat
behavioral2/files/0x000100000001ab5c-18.dat	dcrat
behavioral2/files/0x000100000001ab5c-19.dat	dcrat

Executes dropped EXE 2 IoCs

pid	Process
3484	FontsavesIntorefperf.exe
3612	sihost.exe

Reads user/profile data of web browsers 2 TTPs
Infostealers often target stored browser data, which can include saved credentials etc.
spyware stealer

Data from Local System
T1005

Credentials in Files
T1081

Looks up external IP address via web service 2 IoCs

Uses a legitimate IP lookup service to find the infected system's external IP.

flow	ioc
19	ipinfo.io
20	ipinfo.io

Drops file in System32 directory 7 IoCs

description	ioc	Process
File created	C:\Windows\System32\srumapi\66fc9ff0ee96c2b21f0cfded48750ae9e3032bf3	FontsavesIntorefperf.exe
File created	C:\Windows\System32\wbem\WsmAgent\WmiPrvSE.exe	FontsavesIntorefperf.exe
File opened for modification	C:\Windows\System32\wbem\WsmAgent\WmiPrvSE.exe	FontsavesIntorefperf.exe
File created	C:\Windows\System32\wbem\WsmAgent\24dbde2999530ef5fd907494bc374d663924116c	FontsavesIntorefperf.exe
File created	C:\Windows\System32\KBDSF\fontdrvhost.exe	FontsavesIntorefperf.exe
File created	C:\Windows\System32\KBDSF\5b884080fd4f94e2695da25c503f9e33b9605b83	FontsavesIntorefperf.exe
File created	C:\Windows\System32\srumapi\sihost.exe	FontsavesIntorefperf.exe

Drops file in Program Files directory 2 IoCs

description	ioc	Process
File created	C:\Program Files\Common Files\microsoft shared\ClickToRun\AppvIsvSubsystems64\OfficeClickToRun.exe	FontsavesIntorefperf.exe
File created	C:\Program Files\Common Files\microsoft shared\ClickToRun\AppvIsvSubsystems64\e6c9b481da804f07baff8eff543b0a1441069b5d	FontsavesIntorefperf.exe

Enumerates physical storage devices 1 TTPs
Attempts to interact with connected storage/optical drive(s). Likely ransomware behaviour.

System Information Discovery
T1082

Creates scheduled task(s) 1 TTPs 4 IoCs

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

persistence

Scheduled Task

T1053

pid	Process
2928	schtasks.exe
2424	schtasks.exe
3116	schtasks.exe
4084	schtasks.exe

Modifies registry class 1 IoCs

description	ioc	Process
Key created	\REGISTRY\USER\S-1-5-21-3341490333-719741536-2920803124-1000_Classes\Local Settings	f4787944e95596ad1847910ce4180a20.exe

Suspicious behavior: EnumeratesProcesses 11 IoCs

pid	Process
3484	FontsavesIntorefperf.exe
3484	FontsavesIntorefperf.exe
3484	FontsavesIntorefperf.exe
3484	FontsavesIntorefperf.exe
3484	FontsavesIntorefperf.exe
3484	FontsavesIntorefperf.exe
3484	FontsavesIntorefperf.exe
3484	FontsavesIntorefperf.exe
3484	FontsavesIntorefperf.exe
3612	sihost.exe
3612	sihost.exe

Suspicious behavior: GetForegroundWindowSpam 1 IoCs

pid	Process
3612	sihost.exe

Suspicious use of AdjustPrivilegeToken 2 IoCs

description	pid	Process
Token: SeDebugPrivilege	3484	FontsavesIntorefperf.exe
Token: SeDebugPrivilege	3612	sihost.exe

Suspicious use of WriteProcessMemory 18 IoCs

description	pid	Process	procid_target
PID 3008 wrote to memory of 3532	3008	f4787944e95596ad1847910ce4180a20.exe	76
PID 3008 wrote to memory of 3532	3008	f4787944e95596ad1847910ce4180a20.exe	76
PID 3008 wrote to memory of 3532	3008	f4787944e95596ad1847910ce4180a20.exe	76
PID 3532 wrote to memory of 4036	3532	WScript.exe	80
PID 3532 wrote to memory of 4036	3532	WScript.exe	80
PID 3532 wrote to memory of 4036	3532	WScript.exe	80
PID 4036 wrote to memory of 3484	4036	cmd.exe	82
PID 4036 wrote to memory of 3484	4036	cmd.exe	82
PID 3484 wrote to memory of 2424	3484	FontsavesIntorefperf.exe	84
PID 3484 wrote to memory of 2424	3484	FontsavesIntorefperf.exe	84
PID 3484 wrote to memory of 3116	3484	FontsavesIntorefperf.exe	86
PID 3484 wrote to memory of 3116	3484	FontsavesIntorefperf.exe	86
PID 3484 wrote to memory of 4084	3484	FontsavesIntorefperf.exe	88
PID 3484 wrote to memory of 4084	3484	FontsavesIntorefperf.exe	88
PID 3484 wrote to memory of 2928	3484	FontsavesIntorefperf.exe	90
PID 3484 wrote to memory of 2928	3484	FontsavesIntorefperf.exe	90
PID 3484 wrote to memory of 3612	3484	FontsavesIntorefperf.exe	92
PID 3484 wrote to memory of 3612	3484	FontsavesIntorefperf.exe	92

C:\Users\Admin\AppData\Local\Temp\f4787944e95596ad1847910ce4180a20.exe
"C:\Users\Admin\AppData\Local\Temp\f4787944e95596ad1847910ce4180a20.exe"
1⤵
- Modifies registry class
- Suspicious use of WriteProcessMemory
PID:3008
- C:\Windows\SysWOW64\WScript.exe
  "C:\Windows\System32\WScript.exe" "C:\FontsavesInto\m8aBJ5FB2D94qk25GJ.vbe"
  2⤵
  - Suspicious use of WriteProcessMemory
  PID:3532
- - C:\Windows\SysWOW64\cmd.exe
    C:\Windows\system32\cmd.exe /c ""C:\FontsavesInto\5X6xHq8OosomjmO.bat" "
    3⤵
    - Suspicious use of WriteProcessMemory
    PID:4036
  - - C:\FontsavesInto\FontsavesIntorefperf.exe
      "C:\FontsavesInto\FontsavesIntorefperf.exe"
      4⤵
      Executes dropped EXE
      Drops file in System32 directory
      Drops file in Program Files directory
      Suspicious behavior: EnumeratesProcesses
      Suspicious use of AdjustPrivilegeToken
      Suspicious use of WriteProcessMemory
      PID:3484
    - - C:\Windows\SYSTEM32\schtasks.exe
        
        "schtasks" /create /tn "WmiPrvSE" /sc ONLOGON /tr "'C:\Windows\System32\wbem\WsmAgent\WmiPrvSE.exe'" /rl HIGHEST /f
        5⤵
        Creates scheduled task(s)
        
        PID:2424
    - - C:\Windows\SYSTEM32\schtasks.exe
        
        "schtasks" /create /tn "fontdrvhost" /sc ONLOGON /tr "'C:\Windows\System32\KBDSF\fontdrvhost.exe'" /rl HIGHEST /f
        5⤵
        Creates scheduled task(s)
        
        PID:3116
    - - C:\Windows\SYSTEM32\schtasks.exe
        
        "schtasks" /create /tn "OfficeClickToRun" /sc ONLOGON /tr "'C:\Program Files\Common Files\microsoft shared\ClickToRun\AppvIsvSubsystems64\OfficeClickToRun.exe'" /rl HIGHEST /f
        5⤵
        Creates scheduled task(s)
        
        PID:4084
    - - C:\Windows\SYSTEM32\schtasks.exe
        
        "schtasks" /create /tn "sihost" /sc ONLOGON /tr "'C:\Windows\System32\srumapi\sihost.exe'" /rl HIGHEST /f
        5⤵
        Creates scheduled task(s)
        
        PID:2928
    - - C:\Windows\System32\srumapi\sihost.exe
        
        "C:\Windows\System32\srumapi\sihost.exe"
        5⤵
        Executes dropped EXE
        Suspicious behavior: EnumeratesProcesses
        Suspicious behavior: GetForegroundWindowSpam
        Suspicious use of AdjustPrivilegeToken
        
        PID:3612

Network

MITRE ATT&CK Enterprise v6

Initial Access

Execution

Scheduled Task

1

T1053

Persistence

Scheduled Task

1

T1053

Privilege Escalation

Scheduled Task

1

T1053

Defense Evasion

Credential Access

Credentials in Files

1

T1081

Discovery

System Information Discovery

1

T1082

Lateral Movement

Collection

Data from Local System

1

T1005

Command and Control

Exfiltration

Impact

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Downloads

memory/3484-10-0x0000018AE53C0000-0x0000018AE53C1000-memory.dmp

Filesize
4KB

Download
memory/3484-12-0x0000018AFF900000-0x0000018AFF902000-memory.dmp

Filesize
8KB

Download
memory/3484-9-0x00007FFCA1E60000-0x00007FFCA284C000-memory.dmp

Filesize
9.9MB

Download
memory/3612-20-0x00007FFCA1E60000-0x00007FFCA284C000-memory.dmp

Filesize
9.9MB

Download
memory/3612-23-0x0000026290D90000-0x0000026290D92000-memory.dmp

Filesize
8KB

Download
memory/3612-24-0x0000026290DC0000-0x0000026290DC1000-memory.dmp

Filesize
4KB

Download

Analysis

Sharing

General

Malware Config

Signatures

Processes

Network

MITRE ATT&CK Enterprise v6

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Downloads