dcrat | ac8a08a5dd79ab90a206fe5f79c6d0982a3d9f21ea23daae9e0a04a0edd65892

General

Target

LegacyPhasmo/start.exe
Size

1.1MB
MD5

7002fdc4d02a4ed4a5a6f56bc40efcef
SHA1

cef5ea6d5507392e4fd5cb9511160f4882b4d8b8
SHA256

6fddd93899ba0f1de262aa86d1e7f4ed3df8b29e9d2b9679d42b5a81addea6f4
SHA512

d5859012071a604563d96c8cffb9a5f12ae5a085b0160d3e90de140bd50c752d97287c1810140d72bf2404880fecd8332a458005e5e8052f5ad74cf11f12a538
SSDEEP

24576:U2G/nvxW3Ww0t6eSgFX3x5aC6FRMzpC6nHZW/n:UbA306e9FTtYeP0P

Score

10^/10

dcrat 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

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	2504	2360	schtasks.exe	32
Parent C:\Windows\system32\wbem\wmiprvse.exe is not expected to spawn this process	2012	2360	schtasks.exe	32
Parent C:\Windows\system32\wbem\wmiprvse.exe is not expected to spawn this process	2336	2360	schtasks.exe	32
Parent C:\Windows\system32\wbem\wmiprvse.exe is not expected to spawn this process	2404	2360	schtasks.exe	32
Parent C:\Windows\system32\wbem\wmiprvse.exe is not expected to spawn this process	2796	2360	schtasks.exe	32
Parent C:\Windows\system32\wbem\wmiprvse.exe is not expected to spawn this process	1884	2360	schtasks.exe	32
Parent C:\Windows\system32\wbem\wmiprvse.exe is not expected to spawn this process	1300	2360	schtasks.exe	32
Parent C:\Windows\system32\wbem\wmiprvse.exe is not expected to spawn this process	1632	2360	schtasks.exe	32
Parent C:\Windows\system32\wbem\wmiprvse.exe is not expected to spawn this process	2316	2360	schtasks.exe	32
Parent C:\Windows\system32\wbem\wmiprvse.exe is not expected to spawn this process	2188	2360	schtasks.exe	32
Parent C:\Windows\system32\wbem\wmiprvse.exe is not expected to spawn this process	636	2360	schtasks.exe	32
Parent C:\Windows\system32\wbem\wmiprvse.exe is not expected to spawn this process	2696	2360	schtasks.exe	32

DCRat payload 3 IoCs

Detects payload of DCRat, commonly dropped by NSIS installers.

rat

resource	yara_rule
behavioral3/files/0x0029000000015c2f-12.dat	dcrat
behavioral3/memory/2484-13-0x0000000000350000-0x0000000000426000-memory.dmp	dcrat
behavioral3/memory/1340-29-0x0000000000EE0000-0x0000000000FB6000-memory.dmp	dcrat

Executes dropped EXE 2 IoCs

pid	Process
2484	reviewMonitor.exe
1340	reviewMonitor.exe

Loads dropped DLL 2 IoCs

pid	Process
2552	cmd.exe
2552	cmd.exe

Drops file in Program Files directory 4 IoCs

description	ioc	Process
File created	C:\Program Files\Windows NT\winlogon.exe	reviewMonitor.exe
File created	C:\Program Files\Windows NT\cc11b995f2a76d	reviewMonitor.exe
File created	C:\Program Files\Windows NT\Accessories\de-DE\dwm.exe	reviewMonitor.exe
File created	C:\Program Files\Windows NT\Accessories\de-DE\6cb0b6c459d5d3	reviewMonitor.exe

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

System Information Discovery
T1082

Creates scheduled task(s) 1 TTPs 12 IoCs

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

persistence

Scheduled Task/Job

T1053

pid	Process
2336	schtasks.exe
2796	schtasks.exe
1632	schtasks.exe
2316	schtasks.exe
636	schtasks.exe
2696	schtasks.exe
2504	schtasks.exe
2012	schtasks.exe
2404	schtasks.exe
1884	schtasks.exe
1300	schtasks.exe
2188	schtasks.exe

Suspicious behavior: EnumeratesProcesses 4 IoCs

pid	Process
2484	reviewMonitor.exe
2484	reviewMonitor.exe
2484	reviewMonitor.exe
1340	reviewMonitor.exe

Suspicious use of AdjustPrivilegeToken 2 IoCs

description	pid	Process
Token: SeDebugPrivilege	2484	reviewMonitor.exe
Token: SeDebugPrivilege	1340	reviewMonitor.exe

Suspicious use of WriteProcessMemory 21 IoCs

description	pid	Process	procid_target
PID 1400 wrote to memory of 2616	1400	start.exe	28
PID 1400 wrote to memory of 2616	1400	start.exe	28
PID 1400 wrote to memory of 2616	1400	start.exe	28
PID 1400 wrote to memory of 2616	1400	start.exe	28
PID 2616 wrote to memory of 2552	2616	WScript.exe	29
PID 2616 wrote to memory of 2552	2616	WScript.exe	29
PID 2616 wrote to memory of 2552	2616	WScript.exe	29
PID 2616 wrote to memory of 2552	2616	WScript.exe	29
PID 2552 wrote to memory of 2484	2552	cmd.exe	31
PID 2552 wrote to memory of 2484	2552	cmd.exe	31
PID 2552 wrote to memory of 2484	2552	cmd.exe	31
PID 2552 wrote to memory of 2484	2552	cmd.exe	31
PID 2484 wrote to memory of 2932	2484	reviewMonitor.exe	45
PID 2484 wrote to memory of 2932	2484	reviewMonitor.exe	45
PID 2484 wrote to memory of 2932	2484	reviewMonitor.exe	45
PID 2932 wrote to memory of 1628	2932	cmd.exe	47
PID 2932 wrote to memory of 1628	2932	cmd.exe	47
PID 2932 wrote to memory of 1628	2932	cmd.exe	47
PID 2932 wrote to memory of 1340	2932	cmd.exe	48
PID 2932 wrote to memory of 1340	2932	cmd.exe	48
PID 2932 wrote to memory of 1340	2932	cmd.exe	48

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\LegacyPhasmo\start.exe
"C:\Users\Admin\AppData\Local\Temp\LegacyPhasmo\start.exe"
1⤵
- Suspicious use of WriteProcessMemory
PID:1400
- C:\Windows\SysWOW64\WScript.exe
  "C:\Windows\System32\WScript.exe" "C:\MshyperHostmonitordhcp\0DcM5JqD9S9f9.vbe"
  2⤵
  - Suspicious use of WriteProcessMemory
  PID:2616
- - C:\Windows\SysWOW64\cmd.exe
    cmd /c ""C:\MshyperHostmonitordhcp\MgkA4hhn0q04GXYwCcIaXFzSS.bat" "
    3⤵
    - Loads dropped DLL
    - Suspicious use of WriteProcessMemory
    PID:2552
  - - C:\MshyperHostmonitordhcp\reviewMonitor.exe
      "C:\MshyperHostmonitordhcp\reviewMonitor.exe"
      4⤵
      Executes dropped EXE
      Drops file in Program Files directory
      Suspicious behavior: EnumeratesProcesses
      Suspicious use of AdjustPrivilegeToken
      Suspicious use of WriteProcessMemory
      PID:2484
    - - C:\Windows\System32\cmd.exe
        
        "C:\Windows\System32\cmd.exe" /C "C:\Users\Admin\AppData\Local\Temp\FC3kSwLXrk.bat"
        5⤵
        Suspicious use of WriteProcessMemory
        
        PID:2932
      - C:\Windows\system32\w32tm.exe
        
        w32tm /stripchart /computer:localhost /period:5 /dataonly /samples:2
        6⤵
        
        PID:1628
      - C:\MSOCache\All Users\reviewMonitor.exe
        
        "C:\MSOCache\All Users\reviewMonitor.exe"
        6⤵
        Executes dropped EXE
        Suspicious behavior: EnumeratesProcesses
        Suspicious use of AdjustPrivilegeToken
        
        PID:1340

C:\Windows\system32\schtasks.exe
schtasks.exe /create /tn "conhostc" /sc MINUTE /mo 8 /tr "'C:\MshyperHostmonitordhcp\conhost.exe'" /f
1⤵
- Process spawned unexpected child process
- Creates scheduled task(s)
PID:2504

C:\Windows\system32\schtasks.exe
schtasks.exe /create /tn "conhost" /sc ONLOGON /tr "'C:\MshyperHostmonitordhcp\conhost.exe'" /rl HIGHEST /f
1⤵
- Process spawned unexpected child process
- Creates scheduled task(s)
PID:2012

C:\Windows\system32\schtasks.exe
schtasks.exe /create /tn "conhostc" /sc MINUTE /mo 9 /tr "'C:\MshyperHostmonitordhcp\conhost.exe'" /rl HIGHEST /f
1⤵
- Process spawned unexpected child process
- Creates scheduled task(s)
PID:2336

C:\Windows\system32\schtasks.exe
schtasks.exe /create /tn "winlogonw" /sc MINUTE /mo 11 /tr "'C:\Program Files\Windows NT\winlogon.exe'" /f
1⤵
- Process spawned unexpected child process
- Creates scheduled task(s)
PID:2404

C:\Windows\system32\schtasks.exe
schtasks.exe /create /tn "winlogon" /sc ONLOGON /tr "'C:\Program Files\Windows NT\winlogon.exe'" /rl HIGHEST /f
1⤵
- Process spawned unexpected child process
- Creates scheduled task(s)
PID:2796

C:\Windows\system32\schtasks.exe
schtasks.exe /create /tn "winlogonw" /sc MINUTE /mo 13 /tr "'C:\Program Files\Windows NT\winlogon.exe'" /rl HIGHEST /f
1⤵
- Process spawned unexpected child process
- Creates scheduled task(s)
PID:1884

C:\Windows\system32\schtasks.exe
schtasks.exe /create /tn "reviewMonitorr" /sc MINUTE /mo 6 /tr "'C:\MSOCache\All Users\reviewMonitor.exe'" /f
1⤵
- Process spawned unexpected child process
- Creates scheduled task(s)
PID:1300

C:\Windows\system32\schtasks.exe
schtasks.exe /create /tn "reviewMonitor" /sc ONLOGON /tr "'C:\MSOCache\All Users\reviewMonitor.exe'" /rl HIGHEST /f
1⤵
- Process spawned unexpected child process
- Creates scheduled task(s)
PID:1632

C:\Windows\system32\schtasks.exe
schtasks.exe /create /tn "reviewMonitorr" /sc MINUTE /mo 10 /tr "'C:\MSOCache\All Users\reviewMonitor.exe'" /rl HIGHEST /f
1⤵
- Process spawned unexpected child process
- Creates scheduled task(s)
PID:2316

C:\Windows\system32\schtasks.exe
schtasks.exe /create /tn "dwmd" /sc MINUTE /mo 13 /tr "'C:\Program Files\Windows NT\Accessories\de-DE\dwm.exe'" /f
1⤵
- Process spawned unexpected child process
- Creates scheduled task(s)
PID:2188

C:\Windows\system32\schtasks.exe
schtasks.exe /create /tn "dwm" /sc ONLOGON /tr "'C:\Program Files\Windows NT\Accessories\de-DE\dwm.exe'" /rl HIGHEST /f
1⤵
- Process spawned unexpected child process
- Creates scheduled task(s)
PID:636

C:\Windows\system32\schtasks.exe
schtasks.exe /create /tn "dwmd" /sc MINUTE /mo 5 /tr "'C:\Program Files\Windows NT\Accessories\de-DE\dwm.exe'" /rl HIGHEST /f
1⤵
- Process spawned unexpected child process
- Creates scheduled task(s)
PID:2696

Network

MITRE ATT&CK Enterprise v15

Reconnaissance

Resource Development

Initial Access

Execution

Scheduled Task/Job

1

T1053

Persistence

Scheduled Task/Job

1

T1053

Privilege Escalation

Scheduled Task/Job

1

T1053

Defense Evasion

Credential Access

Discovery

Query Registry

1

T1012

System Information Discovery

1

T1082

Lateral Movement

Collection

Command and Control

Exfiltration

Impact

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Downloads

C:\MshyperHostmonitordhcp\0DcM5JqD9S9f9.vbe

Filesize
224B

MD5
d2b97d2aae9482940374f468a574d6a0

SHA1
db0b075661a48ce48889d72331bf6f8dc2678156

SHA256
7a33058c1663d4917294bc87987b53f98fe9dd03ba8be69f288cafa74ece40bf

SHA512
4c17782d77ec02197c012668baaf297df10f8003f512d994343fefff5f9b86be1ecbd6ae8d652a14fb7ae0ccec53d0f5e9ecf40fa0ffa629b190967160502bfa

Download Submit
C:\MshyperHostmonitordhcp\MgkA4hhn0q04GXYwCcIaXFzSS.bat

Filesize
45B

MD5
50ac67118e356521f6739fb631a1bbbe

SHA1
68671a07d7a39463726b43c2d53ef535989cccaf

SHA256
9373ac51e6c5e168c642e48912b314dd69b2b6a47b401e1741ba992ebc06c4df

SHA512
40728b08c37095b39cd4bf67048de5c71f5400433321e37dc4fbc98d77435a960b80734347c25e136b1251324bf7b2b71df7cddb4abc3f213a7113d006996883

Download Submit
C:\MshyperHostmonitordhcp\reviewMonitor.exe

Filesize
827KB

MD5
452f976724291ddcd7fc0d12ff1dc544

SHA1
add1cdb2396b67fa42961ee07d91d7a45bad915a

SHA256
0285686187df5c5ddfda90a068b02a00eb2ce4fea21ea7adef2e07021707ae7d

SHA512
2b637ec0bf44fe2dbd3fe7801413e81cb102eff09fa51c20258fec72c13de8e966ea11db8e0603f54747c18142a0a9a2ccd258cefe25cc32a33931d9da5a6ed3

Download Submit
C:\Users\Admin\AppData\Local\Temp\FC3kSwLXrk.bat

Filesize
204B

MD5
454139e9134c96f3a4bffd7f65a250de

SHA1
fa598e5ad180b290a50f370d7af55633fc5397eb

SHA256
2c7f256e16447dd3d16daca6ace2f76d88e9b1df45180b8dcff3f2c0525ac4fb

SHA512
4aca27848e79dfc8b08e70b68a53d2e3af7b36b8ab1ecd9e4d10d7eae8e4b70be7e2bd8cecb7cf36624c4b2e18526cfd869bcb38f7fc690288697460e4f9c3ab

Download Submit
memory/1340-29-0x0000000000EE0000-0x0000000000FB6000-memory.dmp

Filesize
856KB

Download
memory/2484-13-0x0000000000350000-0x0000000000426000-memory.dmp

Filesize
856KB

Download

Analysis

Sharing

General

Malware Config

Signatures

Processes

Network

MITRE ATT&CK Enterprise v15

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Downloads