dcrat | 1840872e8117b0efa252bc324ae2944d5c5b9242c928e3a568ccde06354eec35

Analysis

max time kernel
146s
max time network
149s
platform
windows7_x64
resource
win7v20201028
submitted
04-02-2021 02:53

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General

Target

4yQyNsXLvwdE7h0o12Rg.exe
Size

684KB
MD5

5786034e260eabfd710772bcfa97bc95
SHA1

a5699e485d73471ecc45da327976aa6d2d2ac2cc
SHA256

1840872e8117b0efa252bc324ae2944d5c5b9242c928e3a568ccde06354eec35
SHA512

a4ce8ffb2e3d4d3104900ba68184d92cfe94f0e7cf4ee8834eec7838769e7e0775b964c09010b9f047c70012adb1850cefcb385c7a7f7c7ad735e7fa82c0f070

Score

10^/10

dcrat infostealer persistence 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

DC Rat Payload 5 IoCs

Detects payload of DCRat, commonly dropped by NSIS installers.

rat

resource	yara_rule
behavioral1/files/0x00030000000130d6-22.dat	dcrat
behavioral1/files/0x00030000000130d6-24.dat	dcrat
behavioral1/files/0x00030000000130d6-25.dat	dcrat
behavioral1/files/0x00030000000130e2-35.dat	dcrat
behavioral1/files/0x00030000000130e2-36.dat	dcrat

Executes dropped EXE 3 IoCs

pid	Process
1720	TvyV4sMJtQ2q43rckgWS.exe
992	reviewcommon.exe
1736	services.exe

Loads dropped DLL 2 IoCs

pid	Process
1960	cmd.exe
1928	cmd.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

Adds Run key to start application 2 TTPs 4 IoCs

persistence

Registry Run Keys / Startup Folder

T1060

Modify Registry

T1112

description	ioc	Process
Set value (str)	\REGISTRY\USER\S-1-5-21-3825035466-2522850611-591511364-1000\Software\Microsoft\Windows\CurrentVersion\Run\lsm = "\"C:\\Windows\\TAPI\\lsm.exe\""	reviewcommon.exe
Set value (str)	\REGISTRY\USER\S-1-5-21-3825035466-2522850611-591511364-1000\Software\Microsoft\Windows\CurrentVersion\Run\lsm = "\"C:\\dlldhcp\\lsm.exe\""	reviewcommon.exe
Set value (str)	\REGISTRY\USER\S-1-5-21-3825035466-2522850611-591511364-1000\Software\Microsoft\Windows\CurrentVersion\Run\services = "\"C:\\Users\\All Users\\Microsoft Help\\services.exe\""	reviewcommon.exe
Set value (str)	\REGISTRY\USER\S-1-5-21-3825035466-2522850611-591511364-1000\Software\Microsoft\Windows\CurrentVersion\Run\spoolsv = "\"C:\\Recovery\\9f428062-1991-11eb-b2ba-ee401b9e63cb\\spoolsv.exe\""	reviewcommon.exe

Looks up external IP address via web service 3 IoCs

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

flow	ioc
5	ipinfo.io
6	ipinfo.io
7	ipinfo.io

Drops file in Windows directory 2 IoCs

description	ioc	Process
File created	C:\Windows\TAPI\lsm.exe	reviewcommon.exe
File created	C:\Windows\TAPI\101b941d020240259ca4912829b53995ad543df6	reviewcommon.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
1160	schtasks.exe
1428	schtasks.exe
1580	schtasks.exe
1816	schtasks.exe

Suspicious behavior: EnumeratesProcesses 3 IoCs

pid	Process
992	reviewcommon.exe
1736	services.exe
1736	services.exe

Suspicious behavior: GetForegroundWindowSpam 1 IoCs

pid	Process
1736	services.exe

Suspicious use of AdjustPrivilegeToken 2 IoCs

description	pid	Process
Token: SeDebugPrivilege	992	reviewcommon.exe
Token: SeDebugPrivilege	1736	services.exe

Suspicious use of WriteProcessMemory 39 IoCs

description	pid	Process	procid_target
PID 1908 wrote to memory of 1520	1908	4yQyNsXLvwdE7h0o12Rg.exe	26
PID 1908 wrote to memory of 1520	1908	4yQyNsXLvwdE7h0o12Rg.exe	26
PID 1908 wrote to memory of 1520	1908	4yQyNsXLvwdE7h0o12Rg.exe	26
PID 1908 wrote to memory of 1520	1908	4yQyNsXLvwdE7h0o12Rg.exe	26
PID 1520 wrote to memory of 1960	1520	WScript.exe	27
PID 1520 wrote to memory of 1960	1520	WScript.exe	27
PID 1520 wrote to memory of 1960	1520	WScript.exe	27
PID 1520 wrote to memory of 1960	1520	WScript.exe	27
PID 1960 wrote to memory of 1720	1960	cmd.exe	29
PID 1960 wrote to memory of 1720	1960	cmd.exe	29
PID 1960 wrote to memory of 1720	1960	cmd.exe	29
PID 1960 wrote to memory of 1720	1960	cmd.exe	29
PID 1720 wrote to memory of 1764	1720	TvyV4sMJtQ2q43rckgWS.exe	30
PID 1720 wrote to memory of 1764	1720	TvyV4sMJtQ2q43rckgWS.exe	30
PID 1720 wrote to memory of 1764	1720	TvyV4sMJtQ2q43rckgWS.exe	30
PID 1720 wrote to memory of 1764	1720	TvyV4sMJtQ2q43rckgWS.exe	30
PID 1764 wrote to memory of 1928	1764	WScript.exe	34
PID 1764 wrote to memory of 1928	1764	WScript.exe	34
PID 1764 wrote to memory of 1928	1764	WScript.exe	34
PID 1764 wrote to memory of 1928	1764	WScript.exe	34
PID 1928 wrote to memory of 992	1928	cmd.exe	36
PID 1928 wrote to memory of 992	1928	cmd.exe	36
PID 1928 wrote to memory of 992	1928	cmd.exe	36
PID 1928 wrote to memory of 992	1928	cmd.exe	36
PID 992 wrote to memory of 1160	992	reviewcommon.exe	38
PID 992 wrote to memory of 1160	992	reviewcommon.exe	38
PID 992 wrote to memory of 1160	992	reviewcommon.exe	38
PID 992 wrote to memory of 1428	992	reviewcommon.exe	40
PID 992 wrote to memory of 1428	992	reviewcommon.exe	40
PID 992 wrote to memory of 1428	992	reviewcommon.exe	40
PID 992 wrote to memory of 1580	992	reviewcommon.exe	42
PID 992 wrote to memory of 1580	992	reviewcommon.exe	42
PID 992 wrote to memory of 1580	992	reviewcommon.exe	42
PID 992 wrote to memory of 1816	992	reviewcommon.exe	44
PID 992 wrote to memory of 1816	992	reviewcommon.exe	44
PID 992 wrote to memory of 1816	992	reviewcommon.exe	44
PID 992 wrote to memory of 1736	992	reviewcommon.exe	46
PID 992 wrote to memory of 1736	992	reviewcommon.exe	46
PID 992 wrote to memory of 1736	992	reviewcommon.exe	46

C:\Users\Admin\AppData\Local\Temp\4yQyNsXLvwdE7h0o12Rg.exe
"C:\Users\Admin\AppData\Local\Temp\4yQyNsXLvwdE7h0o12Rg.exe"
1⤵
- Suspicious use of WriteProcessMemory
PID:1908
- C:\Windows\SysWOW64\WScript.exe
  "C:\Windows\System32\WScript.exe" "C:\dlldhcp\pb9Gu3tG7NmOc5Gajm8xMQsWHj1XvE.vbe"
  2⤵
  - Suspicious use of WriteProcessMemory
  PID:1520
- - C:\Windows\SysWOW64\cmd.exe
    cmd /c ""C:\dlldhcp\Ovv4WrUEEOrKRGuaUIBYpelkPalQwD.bat" "
    3⤵
    - Loads dropped DLL
    - Suspicious use of WriteProcessMemory
    PID:1960
  - - C:\dlldhcp\TvyV4sMJtQ2q43rckgWS.exe
      TvyV4sMJtQ2q43rckgWS.exe -p55ff48c21c9494a5d9e8edfacff40e98a5e08b85
      4⤵
      Executes dropped EXE
      Suspicious use of WriteProcessMemory
      PID:1720
    - - C:\Windows\SysWOW64\WScript.exe
        
        "C:\Windows\System32\WScript.exe" "C:\dlldhcp\06OXEbc57sIIel2pT7VSFVSjXXmfRt.vbe"
        5⤵
        Suspicious use of WriteProcessMemory
        
        PID:1764
      - C:\Windows\SysWOW64\cmd.exe
        
        cmd /c ""C:\dlldhcp\M2pBQ8CVzpBi7EtxSagzVS7Rsq03Qh.bat" "
        6⤵
        Loads dropped DLL
        Suspicious use of WriteProcessMemory
        
        PID:1928
        
        C:\dlldhcp\reviewcommon.exe
        
        "C:\dlldhcp\reviewcommon.exe"
        7⤵
        Executes dropped EXE
        Adds Run key to start application
        Drops file in Windows directory
        Suspicious behavior: EnumeratesProcesses
        Suspicious use of AdjustPrivilegeToken
        Suspicious use of WriteProcessMemory
        
        PID:992
        
        C:\Windows\system32\schtasks.exe
        
        "schtasks" /create /tn "spoolsv" /sc ONLOGON /tr "'C:\Recovery\9f428062-1991-11eb-b2ba-ee401b9e63cb\spoolsv.exe'" /rl HIGHEST /f
        8⤵
        Creates scheduled task(s)
        
        PID:1160
        
        C:\Windows\system32\schtasks.exe
        
        "schtasks" /create /tn "lsm" /sc ONLOGON /tr "'C:\Windows\TAPI\lsm.exe'" /rl HIGHEST /f
        8⤵
        Creates scheduled task(s)
        
        PID:1428
        
        C:\Windows\system32\schtasks.exe
        
        "schtasks" /create /tn "lsm" /sc ONLOGON /tr "'C:\dlldhcp\lsm.exe'" /rl HIGHEST /f
        8⤵
        Creates scheduled task(s)
        
        PID:1580
        
        C:\Windows\system32\schtasks.exe
        
        "schtasks" /create /tn "services" /sc ONLOGON /tr "'C:\Users\All Users\Microsoft Help\services.exe'" /rl HIGHEST /f
        8⤵
        Creates scheduled task(s)
        
        PID:1816
        
        C:\Users\All Users\Microsoft Help\services.exe
        
        "C:\Users\All Users\Microsoft Help\services.exe"
        8⤵
        Executes dropped EXE
        Suspicious behavior: EnumeratesProcesses
        Suspicious behavior: GetForegroundWindowSpam
        Suspicious use of AdjustPrivilegeToken
        
        PID:1736

Network

MITRE ATT&CK Enterprise v6

Initial Access

Execution

Scheduled Task

T1053

Persistence

Registry Run Keys / Startup Folder

T1060

Scheduled Task

T1053

Privilege Escalation

Scheduled Task

T1053

Defense Evasion

Modify Registry

T1112

Credential Access

Credentials in Files

T1081

Discovery

System Information Discovery

T1082

Lateral Movement

Collection

Data from Local System

T1005

Command and Control

Exfiltration

Impact

Replay Monitor

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Downloads

memory/992-29-0x000000001B490000-0x000000001B492000-memory.dmp

Filesize
8KB

Download
memory/992-26-0x000007FEF53C0000-0x000007FEF5DAC000-memory.dmp

Filesize
9.9MB

Download
memory/992-27-0x00000000009C0000-0x00000000009C1000-memory.dmp

Filesize
4KB

Download
memory/1520-8-0x0000000002750000-0x0000000002754000-memory.dmp

Filesize
16KB

Download
memory/1720-14-0x00000000024A0000-0x00000000025A1000-memory.dmp

Filesize
1.0MB

Download
memory/1736-37-0x000007FEF53C0000-0x000007FEF5DAC000-memory.dmp

Filesize
9.9MB

Download
memory/1736-38-0x0000000000B90000-0x0000000000B91000-memory.dmp

Filesize
4KB

Download
memory/1736-40-0x000000001B1C0000-0x000000001B1C2000-memory.dmp

Filesize
8KB

Download
memory/1764-21-0x0000000002560000-0x0000000002564000-memory.dmp

Filesize
16KB

Download
memory/1908-2-0x0000000076271000-0x0000000076273000-memory.dmp

Filesize
8KB

Download