dcrat | eefb1fbb690c0c28f191fbc443793d4badc01ecee0416a7d3a4e46ecd4583c57

General

Target
EEFB1FBB690C0C28F191FBC443793D4BADC01ECEE0416.exe
Size 1.1MB
Sample211114-qhsdtsgdf2
SHA256 eefb1fbb690c0c28f191fbc443793d4badc01ecee0416a7d3a4e46ecd4583c57
MD5 d1301daeebd92b0d322edd6a7972d494
SHA1 8391265891151e818bb335de8889a048a57c623f
SHA512 3f263149d630254080185dd5affbf220260ad3d9362f20adc10a7a389c1d48253a09b168ac235984009fed3b742c0a8d32fa92758b980d2ae5754b38a006bfaf
MD5 SHA1 SHA512

Score

10^/10

dcrat xmrig infostealer miner persistence 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 7 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	1000	1740	schtasks.exe	28
Parent C:\Windows\system32\wbem\wmiprvse.exe is not expected to spawn this process	1980	1740	schtasks.exe	28
Parent C:\Windows\system32\wbem\wmiprvse.exe is not expected to spawn this process	1084	1740	schtasks.exe	28
Parent C:\Windows\system32\wbem\wmiprvse.exe is not expected to spawn this process	1644	1740	schtasks.exe	28
Parent C:\Windows\system32\wbem\wmiprvse.exe is not expected to spawn this process	1556	1740	schtasks.exe	28
Parent C:\Windows\system32\wbem\wmiprvse.exe is not expected to spawn this process	1400	1740	schtasks.exe	28
Parent C:\Windows\system32\wbem\wmiprvse.exe is not expected to spawn this process	1948	1740	schtasks.exe	28

xmrig
XMRig is a high performance, open source, cross platform CPU/GPU miner.
miner xmrig

DCRat Payload 2 IoCs

Detects payload of DCRat, commonly dropped by NSIS installers.

rat

resource	yara_rule
behavioral1/files/0x000600000001224f-59.dat	dcrat
behavioral1/files/0x000600000001224f-60.dat	dcrat

Executes dropped EXE 1 IoCs

pid	Process
1664	System.exe

Adds Run key to start application 2 TTPs 7 IoCs

persistence

Registry Run Keys / Startup Folder

T1060

Modify Registry

T1112

description	ioc	Process
Set value (str)	\REGISTRY\MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Run\EEFB1FBB690C0C28F191FBC443793D4BADC01ECEE0416 = "\"C:\\MSOCache\\All Users\\{90140000-0016-0409-0000-0000000FF1CE}-C\\EEFB1FBB690C0C28F191FBC443793D4BADC01ECEE0416.exe\""	EEFB1FBB690C0C28F191FBC443793D4BADC01ECEE0416.exe
Set value (str)	\REGISTRY\MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Run\EEFB1FBB690C0C28F191FBC443793D4BADC01ECEE0416 = "\"C:\\MSOCache\\All Users\\{90140000-001A-0409-0000-0000000FF1CE}-C\\EEFB1FBB690C0C28F191FBC443793D4BADC01ECEE0416.exe\""	EEFB1FBB690C0C28F191FBC443793D4BADC01ECEE0416.exe
Set value (str)	\REGISTRY\MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Run\wininit = "\"C:\\Windows\\RemotePackages\\wininit.exe\""	EEFB1FBB690C0C28F191FBC443793D4BADC01ECEE0416.exe
Set value (str)	\REGISTRY\MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Run\System = "\"C:\\Recovery\\467657e2-3dd5-11ec-a0d6-f2080972ab74\\System.exe\""	EEFB1FBB690C0C28F191FBC443793D4BADC01ECEE0416.exe
Set value (str)	\REGISTRY\MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Run\WmiPrvSE = "\"C:\\Windows\\system\\WmiPrvSE.exe\""	EEFB1FBB690C0C28F191FBC443793D4BADC01ECEE0416.exe
Set value (str)	\REGISTRY\MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Run\dwm = "\"C:\\Windows\\System32\\wmpcm\\dwm.exe\""	EEFB1FBB690C0C28F191FBC443793D4BADC01ECEE0416.exe
Set value (str)	\REGISTRY\MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Run\dwm = "\"C:\\Windows\\System32\\shunimpl\\dwm.exe\""	EEFB1FBB690C0C28F191FBC443793D4BADC01ECEE0416.exe

Drops file in System32 directory 4 IoCs

description	ioc	Process
File created	C:\Windows\System32\wmpcm\dwm.exe	EEFB1FBB690C0C28F191FBC443793D4BADC01ECEE0416.exe
File created	C:\Windows\System32\wmpcm\6cb0b6c459d5d3455a3da700e713f2e2529862ff	EEFB1FBB690C0C28F191FBC443793D4BADC01ECEE0416.exe
File created	C:\Windows\System32\shunimpl\dwm.exe	EEFB1FBB690C0C28F191FBC443793D4BADC01ECEE0416.exe
File created	C:\Windows\System32\shunimpl\6cb0b6c459d5d3455a3da700e713f2e2529862ff	EEFB1FBB690C0C28F191FBC443793D4BADC01ECEE0416.exe

Drops file in Windows directory 4 IoCs

description	ioc	Process
File created	C:\Windows\RemotePackages\wininit.exe	EEFB1FBB690C0C28F191FBC443793D4BADC01ECEE0416.exe
File created	C:\Windows\RemotePackages\560854153607923c4c5f107085a7db67be01f252	EEFB1FBB690C0C28F191FBC443793D4BADC01ECEE0416.exe
File created	C:\Windows\system\WmiPrvSE.exe	EEFB1FBB690C0C28F191FBC443793D4BADC01ECEE0416.exe
File created	C:\Windows\system\24dbde2999530ef5fd907494bc374d663924116c	EEFB1FBB690C0C28F191FBC443793D4BADC01ECEE0416.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 7 IoCs

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

persistence

Scheduled Task

T1053

pid	Process
1000	schtasks.exe
1980	schtasks.exe
1084	schtasks.exe
1644	schtasks.exe
1556	schtasks.exe
1400	schtasks.exe
1948	schtasks.exe

Suspicious behavior: EnumeratesProcesses 2 IoCs

pid	Process
1600	EEFB1FBB690C0C28F191FBC443793D4BADC01ECEE0416.exe
1664	System.exe

Suspicious use of AdjustPrivilegeToken 2 IoCs

description	pid	Process
Token: SeDebugPrivilege	1600	EEFB1FBB690C0C28F191FBC443793D4BADC01ECEE0416.exe
Token: SeDebugPrivilege	1664	System.exe

Suspicious use of WriteProcessMemory 3 IoCs

description	pid	Process	procid_target
PID 1600 wrote to memory of 1664	1600	EEFB1FBB690C0C28F191FBC443793D4BADC01ECEE0416.exe	36
PID 1600 wrote to memory of 1664	1600	EEFB1FBB690C0C28F191FBC443793D4BADC01ECEE0416.exe	36
PID 1600 wrote to memory of 1664	1600	EEFB1FBB690C0C28F191FBC443793D4BADC01ECEE0416.exe	36

C:\Users\Admin\AppData\Local\Temp\EEFB1FBB690C0C28F191FBC443793D4BADC01ECEE0416.exe
"C:\Users\Admin\AppData\Local\Temp\EEFB1FBB690C0C28F191FBC443793D4BADC01ECEE0416.exe"
1⤵
- Adds Run key to start application
- Drops file in System32 directory
- Drops file in Windows directory
- Suspicious behavior: EnumeratesProcesses
- Suspicious use of AdjustPrivilegeToken
- Suspicious use of WriteProcessMemory
PID:1600
- C:\Recovery\467657e2-3dd5-11ec-a0d6-f2080972ab74\System.exe
  "C:\Recovery\467657e2-3dd5-11ec-a0d6-f2080972ab74\System.exe"
  2⤵
  - Executes dropped EXE
  - Suspicious behavior: EnumeratesProcesses
  - Suspicious use of AdjustPrivilegeToken
  PID:1664

C:\Windows\system32\schtasks.exe
schtasks.exe /create /tn "EEFB1FBB690C0C28F191FBC443793D4BADC01ECEE0416" /sc ONLOGON /tr "'C:\MSOCache\All Users\{90140000-0016-0409-0000-0000000FF1CE}-C\EEFB1FBB690C0C28F191FBC443793D4BADC01ECEE0416.exe'" /rl HIGHEST /f
1⤵
- Process spawned unexpected child process
- Creates scheduled task(s)
PID:1000

C:\Windows\system32\schtasks.exe
schtasks.exe /create /tn "EEFB1FBB690C0C28F191FBC443793D4BADC01ECEE0416" /sc ONLOGON /tr "'C:\MSOCache\All Users\{90140000-001A-0409-0000-0000000FF1CE}-C\EEFB1FBB690C0C28F191FBC443793D4BADC01ECEE0416.exe'" /rl HIGHEST /f
1⤵
- Process spawned unexpected child process
- Creates scheduled task(s)
PID:1980

C:\Windows\system32\schtasks.exe
schtasks.exe /create /tn "wininit" /sc ONLOGON /tr "'C:\Windows\RemotePackages\wininit.exe'" /rl HIGHEST /f
1⤵
- Process spawned unexpected child process
- Creates scheduled task(s)
PID:1084

C:\Windows\system32\schtasks.exe
schtasks.exe /create /tn "System" /sc ONLOGON /tr "'C:\Recovery\467657e2-3dd5-11ec-a0d6-f2080972ab74\System.exe'" /rl HIGHEST /f
1⤵
- Process spawned unexpected child process
- Creates scheduled task(s)
PID:1644

C:\Windows\system32\schtasks.exe
schtasks.exe /create /tn "WmiPrvSE" /sc ONLOGON /tr "'C:\Windows\system\WmiPrvSE.exe'" /rl HIGHEST /f
1⤵
- Process spawned unexpected child process
- Creates scheduled task(s)
PID:1556

C:\Windows\system32\schtasks.exe
schtasks.exe /create /tn "dwm" /sc ONLOGON /tr "'C:\Windows\System32\wmpcm\dwm.exe'" /rl HIGHEST /f
1⤵
- Process spawned unexpected child process
- Creates scheduled task(s)
PID:1400

C:\Windows\system32\schtasks.exe
schtasks.exe /create /tn "dwm" /sc ONLOGON /tr "'C:\Windows\System32\shunimpl\dwm.exe'" /rl HIGHEST /f
1⤵
- Process spawned unexpected child process
- Creates scheduled task(s)
PID:1948