dcrat | ecfdb52196e58db344d66e7ec2e65cb589315dd7bed55bc2a0fe6afe86898433

General

Target

JaffaCakes118_d2887b8a1e477a97c84e4b126cb360a3.exe
Size

1.1MB
MD5

d2887b8a1e477a97c84e4b126cb360a3
SHA1

8fb6cdbc31616bd460e703b5bcb77367321c5c8a
SHA256

ecfdb52196e58db344d66e7ec2e65cb589315dd7bed55bc2a0fe6afe86898433
SHA512

0691b082aba27120413d99749edd4da34e39488ec3da3e325c93dd36a64b725e7d1623b62b87f4a1b064ee42c2c60e05f0d6d0f7520e81b8b7753820446a667b
SSDEEP

12288:s4tUwqOjgrbMHiYVNtdE50qoc+vFqa/out/vsQJktVXN/JEqII1ZpvxIBGLEqqn4:zGfgcsVTdE507cQtHpq/KKvxUGLF+4

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
Dcrat family
dcrat

Process spawned unexpected child process 6 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	2140	2372	schtasks.exe	30
Parent C:\Windows\system32\wbem\wmiprvse.exe is not expected to spawn this process	2864	2372	schtasks.exe	30
Parent C:\Windows\system32\wbem\wmiprvse.exe is not expected to spawn this process	2220	2372	schtasks.exe	30
Parent C:\Windows\system32\wbem\wmiprvse.exe is not expected to spawn this process	2892	2372	schtasks.exe	30
Parent C:\Windows\system32\wbem\wmiprvse.exe is not expected to spawn this process	2804	2372	schtasks.exe	30
Parent C:\Windows\system32\wbem\wmiprvse.exe is not expected to spawn this process	2932	2372	schtasks.exe	30

DCRat payload 3 IoCs

Detects payload of DCRat, commonly dropped by NSIS installers.

rat

resource	yara_rule
behavioral1/memory/2188-1-0x0000000000E50000-0x0000000000F74000-memory.dmp	dcrat
behavioral1/files/0x00050000000195c1-11.dat	dcrat
behavioral1/memory/2748-23-0x0000000000EE0000-0x0000000001004000-memory.dmp	dcrat

Executes dropped EXE 1 IoCs

pid	Process
2748	lsass.exe

Adds Run key to start application 2 TTPs 6 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\lsass = "\"C:\\Windows\\System32\\msgsm32\\lsass.exe\""	JaffaCakes118_d2887b8a1e477a97c84e4b126cb360a3.exe
Set value (str)	\REGISTRY\MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Run\spoolsv = "\"C:\\Windows\\System32\\uexfat\\spoolsv.exe\""	JaffaCakes118_d2887b8a1e477a97c84e4b126cb360a3.exe
Set value (str)	\REGISTRY\MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Run\OSPPSVC = "\"C:\\Program Files\\Common Files\\Microsoft Shared\\OfficeSoftwareProtectionPlatform\\OSPPWMI\\OSPPSVC.exe\""	JaffaCakes118_d2887b8a1e477a97c84e4b126cb360a3.exe
Set value (str)	\REGISTRY\MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Run\csrss = "\"C:\\Windows\\System32\\iscsium\\csrss.exe\""	JaffaCakes118_d2887b8a1e477a97c84e4b126cb360a3.exe
Set value (str)	\REGISTRY\MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Run\csrss = "\"C:\\Users\\Default\\SendTo\\csrss.exe\""	JaffaCakes118_d2887b8a1e477a97c84e4b126cb360a3.exe
Set value (str)	\REGISTRY\MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Run\spoolsv = "\"C:\\Users\\Default User\\spoolsv.exe\""	JaffaCakes118_d2887b8a1e477a97c84e4b126cb360a3.exe

Drops file in System32 directory 7 IoCs

description	ioc	Process
File created	C:\Windows\System32\uexfat\f3b6ecef712a24f33798f5d2fb3790c3d9b894c4	JaffaCakes118_d2887b8a1e477a97c84e4b126cb360a3.exe
File created	C:\Windows\System32\iscsium\csrss.exe	JaffaCakes118_d2887b8a1e477a97c84e4b126cb360a3.exe
File created	C:\Windows\System32\iscsium\886983d96e3d3e31032c679b2d4ea91b6c05afef	JaffaCakes118_d2887b8a1e477a97c84e4b126cb360a3.exe
File created	C:\Windows\System32\msgsm32\lsass.exe	JaffaCakes118_d2887b8a1e477a97c84e4b126cb360a3.exe
File opened for modification	C:\Windows\System32\msgsm32\lsass.exe	JaffaCakes118_d2887b8a1e477a97c84e4b126cb360a3.exe
File created	C:\Windows\System32\msgsm32\6203df4a6bafc7c328ee7f6f8ca0a8a838a8a1b9	JaffaCakes118_d2887b8a1e477a97c84e4b126cb360a3.exe
File created	C:\Windows\System32\uexfat\spoolsv.exe	JaffaCakes118_d2887b8a1e477a97c84e4b126cb360a3.exe

Drops file in Program Files directory 2 IoCs

description	ioc	Process
File created	C:\Program Files\Common Files\Microsoft Shared\OfficeSoftwareProtectionPlatform\OSPPWMI\OSPPSVC.exe	JaffaCakes118_d2887b8a1e477a97c84e4b126cb360a3.exe
File created	C:\Program Files\Common Files\Microsoft Shared\OfficeSoftwareProtectionPlatform\OSPPWMI\1610b97d3ab4a74cd8ae104b51bea7bfcc5b9c6f	JaffaCakes118_d2887b8a1e477a97c84e4b126cb360a3.exe

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

System Information Discovery
T1082

Scheduled Task/Job: Scheduled Task 1 TTPs 6 IoCs

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

persistence execution

Scheduled Task

T1053.005

pid	Process
2140	schtasks.exe
2864	schtasks.exe
2220	schtasks.exe
2892	schtasks.exe
2804	schtasks.exe
2932	schtasks.exe

Suspicious behavior: EnumeratesProcesses 4 IoCs

pid	Process
2188	JaffaCakes118_d2887b8a1e477a97c84e4b126cb360a3.exe
2188	JaffaCakes118_d2887b8a1e477a97c84e4b126cb360a3.exe
2188	JaffaCakes118_d2887b8a1e477a97c84e4b126cb360a3.exe
2748	lsass.exe

Suspicious use of AdjustPrivilegeToken 2 IoCs

description	pid	Process
Token: SeDebugPrivilege	2188	JaffaCakes118_d2887b8a1e477a97c84e4b126cb360a3.exe
Token: SeDebugPrivilege	2748	lsass.exe

Suspicious use of WriteProcessMemory 9 IoCs

description	pid	Process	procid_target
PID 2188 wrote to memory of 3036	2188	JaffaCakes118_d2887b8a1e477a97c84e4b126cb360a3.exe	37
PID 2188 wrote to memory of 3036	2188	JaffaCakes118_d2887b8a1e477a97c84e4b126cb360a3.exe	37
PID 2188 wrote to memory of 3036	2188	JaffaCakes118_d2887b8a1e477a97c84e4b126cb360a3.exe	37
PID 3036 wrote to memory of 2896	3036	cmd.exe	39
PID 3036 wrote to memory of 2896	3036	cmd.exe	39
PID 3036 wrote to memory of 2896	3036	cmd.exe	39
PID 3036 wrote to memory of 2748	3036	cmd.exe	41
PID 3036 wrote to memory of 2748	3036	cmd.exe	41
PID 3036 wrote to memory of 2748	3036	cmd.exe	41

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\JaffaCakes118_d2887b8a1e477a97c84e4b126cb360a3.exe
"C:\Users\Admin\AppData\Local\Temp\JaffaCakes118_d2887b8a1e477a97c84e4b126cb360a3.exe"
1⤵
- Adds Run key to start application
- Drops file in System32 directory
- Drops file in Program Files directory
- Suspicious behavior: EnumeratesProcesses
- Suspicious use of AdjustPrivilegeToken
- Suspicious use of WriteProcessMemory
PID:2188
- C:\Windows\System32\cmd.exe
  "C:\Windows\System32\cmd.exe" /C "C:\Users\Admin\AppData\Local\Temp\bAvju2moKS.bat"
  2⤵
  - Suspicious use of WriteProcessMemory
  PID:3036
- - C:\Windows\system32\w32tm.exe
    w32tm /stripchart /computer:localhost /period:5 /dataonly /samples:2
    3⤵
    PID:2896
- - C:\Windows\System32\msgsm32\lsass.exe
    "C:\Windows\System32\msgsm32\lsass.exe"
    3⤵
    - Executes dropped EXE
    - Suspicious behavior: EnumeratesProcesses
    - Suspicious use of AdjustPrivilegeToken
    PID:2748

C:\Windows\system32\schtasks.exe
schtasks.exe /create /tn "lsass" /sc ONLOGON /tr "'C:\Windows\System32\msgsm32\lsass.exe'" /rl HIGHEST /f
1⤵
- Process spawned unexpected child process
- Scheduled Task/Job: Scheduled Task
PID:2140

C:\Windows\system32\schtasks.exe
schtasks.exe /create /tn "spoolsv" /sc ONLOGON /tr "'C:\Windows\System32\uexfat\spoolsv.exe'" /rl HIGHEST /f
1⤵
- Process spawned unexpected child process
- Scheduled Task/Job: Scheduled Task
PID:2864

C:\Windows\system32\schtasks.exe
schtasks.exe /create /tn "OSPPSVC" /sc ONLOGON /tr "'C:\Program Files\Common Files\Microsoft Shared\OfficeSoftwareProtectionPlatform\OSPPWMI\OSPPSVC.exe'" /rl HIGHEST /f
1⤵
- Process spawned unexpected child process
- Scheduled Task/Job: Scheduled Task
PID:2220

C:\Windows\system32\schtasks.exe
schtasks.exe /create /tn "csrss" /sc ONLOGON /tr "'C:\Windows\System32\iscsium\csrss.exe'" /rl HIGHEST /f
1⤵
- Process spawned unexpected child process
- Scheduled Task/Job: Scheduled Task
PID:2892

C:\Windows\system32\schtasks.exe
schtasks.exe /create /tn "csrss" /sc ONLOGON /tr "'C:\Users\Default\SendTo\csrss.exe'" /rl HIGHEST /f
1⤵
- Process spawned unexpected child process
- Scheduled Task/Job: Scheduled Task
PID:2804

C:\Windows\system32\schtasks.exe
schtasks.exe /create /tn "spoolsv" /sc ONLOGON /tr "'C:\Users\Default User\spoolsv.exe'" /rl HIGHEST /f
1⤵
- Process spawned unexpected child process
- Scheduled Task/Job: Scheduled Task
PID:2932

Network

MITRE ATT&CK Enterprise v15

Reconnaissance

Resource Development

Initial Access

Execution

Scheduled Task/Job

1

T1053

Scheduled Task

1

T1053.005

Persistence

Boot or Logon Autostart Execution

1

T1547

Registry Run Keys / Startup Folder

1

T1547.001

Scheduled Task/Job

1

T1053

Scheduled Task

1

T1053.005

Privilege Escalation

Boot or Logon Autostart Execution

1

T1547

Registry Run Keys / Startup Folder

1

T1547.001

Scheduled Task/Job

1

T1053

Scheduled Task

1

T1053.005

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

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Downloads

C:\Users\Admin\AppData\Local\Temp\bAvju2moKS.bat

Filesize
201B

MD5
e1e434c57b7f1e10f49b09e795f036a6

SHA1
743f1daf3b31348d5115a2493985d8cfa5f28ea9

SHA256
65e916257529644dc12a856ffd5bc9f0bb031ad35e0f8a1569de1461a56b5448

SHA512
d7e0948519ccf6f6efb537d782466b2e2bc50c9ab750cacd1067d88f49f6db45b88a0320882130682a035fb21efc97255d6022a1939b88204ed7aea03741b350

Download Submit
C:\Users\Default\AppData\Roaming\Microsoft\Windows\SendTo\csrss.exe

Filesize
1.1MB

MD5
d2887b8a1e477a97c84e4b126cb360a3

SHA1
8fb6cdbc31616bd460e703b5bcb77367321c5c8a

SHA256
ecfdb52196e58db344d66e7ec2e65cb589315dd7bed55bc2a0fe6afe86898433

SHA512
0691b082aba27120413d99749edd4da34e39488ec3da3e325c93dd36a64b725e7d1623b62b87f4a1b064ee42c2c60e05f0d6d0f7520e81b8b7753820446a667b

Download Submit
memory/2188-0-0x000007FEF5DD3000-0x000007FEF5DD4000-memory.dmp

Filesize
4KB

Download
memory/2188-1-0x0000000000E50000-0x0000000000F74000-memory.dmp

Filesize
1.1MB

Download
memory/2188-2-0x000007FEF5DD0000-0x000007FEF67BC000-memory.dmp

Filesize
9.9MB

Download
memory/2188-20-0x000007FEF5DD0000-0x000007FEF67BC000-memory.dmp

Filesize
9.9MB

Download
memory/2748-23-0x0000000000EE0000-0x0000000001004000-memory.dmp

Filesize
1.1MB

Download
memory/2748-24-0x0000000000650000-0x000000000065C000-memory.dmp

Filesize
48KB

Download
memory/2748-25-0x0000000000670000-0x000000000067C000-memory.dmp

Filesize
48KB

Download
memory/2748-26-0x0000000000680000-0x000000000068C000-memory.dmp

Filesize
48KB

Download
memory/2748-27-0x00000000009E0000-0x00000000009EC000-memory.dmp

Filesize
48KB

Download
memory/2748-29-0x0000000000AB0000-0x0000000000ABA000-memory.dmp

Filesize
40KB

Download
memory/2748-28-0x0000000000AA0000-0x0000000000AA8000-memory.dmp

Filesize
32KB

Download

Analysis

Sharing

General

Malware Config

Signatures

Processes

Network

MITRE ATT&CK Enterprise v15

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Downloads