dcrat | 905fc6297517e940e073d09037ea044f2ba0ecf95f728abae8199bcc0ee2142d

General

Target

e8317caac6568f4d37d8535a1e56ad29_JaffaCakes118.exe
Size

493KB
MD5

e8317caac6568f4d37d8535a1e56ad29
SHA1

f0fd94999b1f177a9c356fe7d5d51ff67b57bd43
SHA256

905fc6297517e940e073d09037ea044f2ba0ecf95f728abae8199bcc0ee2142d
SHA512

339ba4b8ad3187845252d4397781db24e6334d5389437ca6b38132f96ea9d68651d05bb6fe6bf40a91e4398f2faaf73e5eae5d2345a747815f39bb6e946b1834
SSDEEP

6144:7qqDLOObBf5tUgvk+HyxcQFcUdMOMJa1DHjzCytSi2OFbJKnblNGaN+SZxh8D5m5:2qnOO9BtqxcwdhrjzzcOlWkSZ3y5UB

Score

10^/10

dcrat infostealer 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 8 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	2612	2036	schtasks.exe	28
Parent C:\Windows\system32\wbem\wmiprvse.exe is not expected to spawn this process	2688	2036	schtasks.exe	28
Parent C:\Windows\system32\wbem\wmiprvse.exe is not expected to spawn this process	2476	2036	schtasks.exe	28
Parent C:\Windows\system32\wbem\wmiprvse.exe is not expected to spawn this process	2504	2036	schtasks.exe	28
Parent C:\Windows\system32\wbem\wmiprvse.exe is not expected to spawn this process	2292	2036	schtasks.exe	28
Parent C:\Windows\system32\wbem\wmiprvse.exe is not expected to spawn this process	2768	2036	schtasks.exe	28
Parent C:\Windows\system32\wbem\wmiprvse.exe is not expected to spawn this process	2540	2036	schtasks.exe	28
Parent C:\Windows\system32\wbem\wmiprvse.exe is not expected to spawn this process	3024	2036	schtasks.exe	28

DCRat payload 5 IoCs

Detects payload of DCRat, commonly dropped by NSIS installers.

rat

resource	yara_rule
behavioral1/memory/2968-0-0x0000000000370000-0x00000000003F2000-memory.dmp	dcrat
behavioral1/memory/2968-2-0x000000001B000000-0x000000001B080000-memory.dmp	dcrat
behavioral1/files/0x0007000000016d3e-11.dat	dcrat
behavioral1/memory/2112-25-0x0000000000CE0000-0x0000000000D62000-memory.dmp	dcrat
behavioral1/memory/2112-28-0x000000001B090000-0x000000001B110000-memory.dmp	dcrat

Executes dropped EXE 1 IoCs

pid	Process
2112	spoolsv.exe

Adds Run key to start application 2 TTPs 8 IoCs

persistence

Registry Run Keys / Startup Folder

T1547.001

Modify Registry

T1112

description	ioc	Process
Set value (str)	\REGISTRY\MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Run\smss = "\"C:\\Windows\\System32\\LSCSHostPolicy\\smss.exe\""	e8317caac6568f4d37d8535a1e56ad29_JaffaCakes118.exe
Set value (str)	\REGISTRY\MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Run\spoolsv = "\"C:\\Documents and Settings\\spoolsv.exe\""	e8317caac6568f4d37d8535a1e56ad29_JaffaCakes118.exe
Set value (str)	\REGISTRY\MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Run\taskhost = "\"C:\\Documents and Settings\\taskhost.exe\""	e8317caac6568f4d37d8535a1e56ad29_JaffaCakes118.exe
Set value (str)	\REGISTRY\MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Run\lsm = "\"C:\\Documents and Settings\\lsm.exe\""	e8317caac6568f4d37d8535a1e56ad29_JaffaCakes118.exe
Set value (str)	\REGISTRY\MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Run\explorer = "\"C:\\Windows\\HelpPane\\explorer.exe\""	e8317caac6568f4d37d8535a1e56ad29_JaffaCakes118.exe
Set value (str)	\REGISTRY\MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Run\csrss = "\"C:\\Windows\\Downloaded Program Files\\csrss.exe\""	e8317caac6568f4d37d8535a1e56ad29_JaffaCakes118.exe
Set value (str)	\REGISTRY\MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Run\System = "\"C:\\Recovery\\d6b272a2-8f1b-11ee-9e28-7ed9061e9c39\\System.exe\""	e8317caac6568f4d37d8535a1e56ad29_JaffaCakes118.exe
Set value (str)	\REGISTRY\MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Run\csrss = "\"C:\\PerfLogs\\Admin\\csrss.exe\""	e8317caac6568f4d37d8535a1e56ad29_JaffaCakes118.exe

Drops file in System32 directory 2 IoCs

description	ioc	Process
File created	C:\Windows\System32\LSCSHostPolicy\smss.exe	e8317caac6568f4d37d8535a1e56ad29_JaffaCakes118.exe
File created	C:\Windows\System32\LSCSHostPolicy\69ddcba757bf72f7d36c464c71f42baab150b2b9	e8317caac6568f4d37d8535a1e56ad29_JaffaCakes118.exe

Drops file in Windows directory 4 IoCs

description	ioc	Process
File created	C:\Windows\HelpPane\explorer.exe	e8317caac6568f4d37d8535a1e56ad29_JaffaCakes118.exe
File created	C:\Windows\HelpPane\7a0fd90576e08807bde2cc57bcf9854bbce05fe3	e8317caac6568f4d37d8535a1e56ad29_JaffaCakes118.exe
File created	C:\Windows\Downloaded Program Files\csrss.exe	e8317caac6568f4d37d8535a1e56ad29_JaffaCakes118.exe
File created	C:\Windows\Downloaded Program Files\886983d96e3d3e31032c679b2d4ea91b6c05afef	e8317caac6568f4d37d8535a1e56ad29_JaffaCakes118.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 8 IoCs

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

persistence

Scheduled Task/Job

T1053

pid	Process
3024	schtasks.exe
2612	schtasks.exe
2688	schtasks.exe
2476	schtasks.exe
2504	schtasks.exe
2292	schtasks.exe
2768	schtasks.exe
2540	schtasks.exe

Suspicious behavior: EnumeratesProcesses 4 IoCs

pid	Process
2968	e8317caac6568f4d37d8535a1e56ad29_JaffaCakes118.exe
2968	e8317caac6568f4d37d8535a1e56ad29_JaffaCakes118.exe
2968	e8317caac6568f4d37d8535a1e56ad29_JaffaCakes118.exe
2112	spoolsv.exe

Suspicious use of AdjustPrivilegeToken 2 IoCs

description	pid	Process
Token: SeDebugPrivilege	2968	e8317caac6568f4d37d8535a1e56ad29_JaffaCakes118.exe
Token: SeDebugPrivilege	2112	spoolsv.exe

Suspicious use of WriteProcessMemory 3 IoCs

description	pid	Process	procid_target
PID 2968 wrote to memory of 2112	2968	e8317caac6568f4d37d8535a1e56ad29_JaffaCakes118.exe	37
PID 2968 wrote to memory of 2112	2968	e8317caac6568f4d37d8535a1e56ad29_JaffaCakes118.exe	37
PID 2968 wrote to memory of 2112	2968	e8317caac6568f4d37d8535a1e56ad29_JaffaCakes118.exe	37

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\e8317caac6568f4d37d8535a1e56ad29_JaffaCakes118.exe
"C:\Users\Admin\AppData\Local\Temp\e8317caac6568f4d37d8535a1e56ad29_JaffaCakes118.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:2968
- C:\Documents and Settings\spoolsv.exe
  "C:\Documents and Settings\spoolsv.exe"
  2⤵
  - Executes dropped EXE
  - Suspicious behavior: EnumeratesProcesses
  - Suspicious use of AdjustPrivilegeToken
  PID:2112

C:\Windows\system32\schtasks.exe
schtasks.exe /create /tn "System" /sc ONLOGON /tr "'C:\Recovery\d6b272a2-8f1b-11ee-9e28-7ed9061e9c39\System.exe'" /rl HIGHEST /f
1⤵
- Process spawned unexpected child process
- Creates scheduled task(s)
PID:2612

C:\Windows\system32\schtasks.exe
schtasks.exe /create /tn "csrss" /sc ONLOGON /tr "'C:\PerfLogs\Admin\csrss.exe'" /rl HIGHEST /f
1⤵
- Process spawned unexpected child process
- Creates scheduled task(s)
PID:2688

C:\Windows\system32\schtasks.exe
schtasks.exe /create /tn "smss" /sc ONLOGON /tr "'C:\Windows\System32\LSCSHostPolicy\smss.exe'" /rl HIGHEST /f
1⤵
- Process spawned unexpected child process
- Creates scheduled task(s)
PID:2476

C:\Windows\system32\schtasks.exe
schtasks.exe /create /tn "spoolsv" /sc ONLOGON /tr "'C:\Documents and Settings\spoolsv.exe'" /rl HIGHEST /f
1⤵
- Process spawned unexpected child process
- Creates scheduled task(s)
PID:2504

C:\Windows\system32\schtasks.exe
schtasks.exe /create /tn "taskhost" /sc ONLOGON /tr "'C:\Documents and Settings\taskhost.exe'" /rl HIGHEST /f
1⤵
- Process spawned unexpected child process
- Creates scheduled task(s)
PID:2292

C:\Windows\system32\schtasks.exe
schtasks.exe /create /tn "lsm" /sc ONLOGON /tr "'C:\Documents and Settings\lsm.exe'" /rl HIGHEST /f
1⤵
- Process spawned unexpected child process
- Creates scheduled task(s)
PID:2768

C:\Windows\system32\schtasks.exe
schtasks.exe /create /tn "explorer" /sc ONLOGON /tr "'C:\Windows\HelpPane\explorer.exe'" /rl HIGHEST /f
1⤵
- Process spawned unexpected child process
- Creates scheduled task(s)
PID:2540

C:\Windows\system32\schtasks.exe
schtasks.exe /create /tn "csrss" /sc ONLOGON /tr "'C:\Windows\Downloaded Program Files\csrss.exe'" /rl HIGHEST /f
1⤵
- Process spawned unexpected child process
- Creates scheduled task(s)
PID:3024

Network

MITRE ATT&CK Enterprise v15

Reconnaissance

Resource Development

Initial Access

Execution

Scheduled Task/Job

1

T1053

Persistence

Boot or Logon Autostart Execution

1

T1547

Registry Run Keys / Startup Folder

Scheduled Task/Job

Privilege Escalation

Boot or Logon Autostart Execution

1

T1547

Registry Run Keys / Startup Folder

Scheduled Task/Job

Defense Evasion

Modify Registry

1

T1112

Credential Access

Discovery

Query Registry

1

T1012

System Information Discovery

1

T1082

Lateral Movement

Collection

Command and Control

Exfiltration

Impact

Replay Monitor

Loading Replay Monitor...

Downloads

C:\Users\taskhost.exe

Filesize
493KB

MD5
e8317caac6568f4d37d8535a1e56ad29

SHA1
f0fd94999b1f177a9c356fe7d5d51ff67b57bd43

SHA256
905fc6297517e940e073d09037ea044f2ba0ecf95f728abae8199bcc0ee2142d

SHA512
339ba4b8ad3187845252d4397781db24e6334d5389437ca6b38132f96ea9d68651d05bb6fe6bf40a91e4398f2faaf73e5eae5d2345a747815f39bb6e946b1834

Download Submit
memory/2112-25-0x0000000000CE0000-0x0000000000D62000-memory.dmp

Filesize
520KB

Download
memory/2112-27-0x000007FEF5CE0000-0x000007FEF66CC000-memory.dmp

Filesize
9.9MB

Download
memory/2112-28-0x000000001B090000-0x000000001B110000-memory.dmp

Filesize
512KB

Download
memory/2112-29-0x000007FEF5CE0000-0x000007FEF66CC000-memory.dmp

Filesize
9.9MB

Download
memory/2112-30-0x000000001B090000-0x000000001B110000-memory.dmp

Filesize
512KB

Download
memory/2112-31-0x000007FEF5CE0000-0x000007FEF66CC000-memory.dmp

Filesize
9.9MB

Download
memory/2968-0-0x0000000000370000-0x00000000003F2000-memory.dmp

Filesize
520KB

Download
memory/2968-1-0x000007FEF5CE0000-0x000007FEF66CC000-memory.dmp

Filesize
9.9MB

Download
memory/2968-2-0x000000001B000000-0x000000001B080000-memory.dmp

Filesize
512KB

Download
memory/2968-26-0x000007FEF5CE0000-0x000007FEF66CC000-memory.dmp

Filesize
9.9MB

Download

Analysis

Sharing

General

Malware Config

Signatures

Processes

Network

MITRE ATT&CK Enterprise v15

Replay Monitor

Loading Replay Monitor...

Downloads