dcrat | 94009d1129caa3d7c53557e6f0bc10c546b70389242959cf710ec19b64d66d7a

General

Target

88d152d4ca2aad8c3aec5567cf9d6962_JaffaCakes118.exe
Size

365KB
MD5

88d152d4ca2aad8c3aec5567cf9d6962
SHA1

d98c4fdccbe6e012803e889a712919c94b279b78
SHA256

94009d1129caa3d7c53557e6f0bc10c546b70389242959cf710ec19b64d66d7a
SHA512

bbf281515abe55d6b4853368dc74d030b62709976ba413b7b8d5c05105d99980eb19a2b1bf128d09c2e77c3331ad83e590a206f840a6afb9d60ec52d606102fb
SSDEEP

6144:Khg8RILtEndj8KoOnBCI9LtzN+4lPkJDuXAuY+DWRNqqDL:KpndjJIan+4lkD0Y+Vqn

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

DCRat payload 3 IoCs

Detects payload of DCRat, commonly dropped by NSIS installers.

rat

Processes:

resource	yara_rule
behavioral1/memory/2236-1-0x0000000000D60000-0x0000000000DC2000-memory.dmp	dcrat
behavioral1/files/0x0006000000019489-13.dat	dcrat
behavioral1/memory/2812-15-0x0000000000E50000-0x0000000000EB2000-memory.dmp	dcrat

Executes dropped EXE 1 IoCs

Processes:

smss.exe

pid	Process
2812	smss.exe

Adds Run key to start application 2 TTPs 4 IoCs

persistence

Registry Run Keys / Startup Folder

T1547.001

Modify Registry

T1112

Processes:

88d152d4ca2aad8c3aec5567cf9d6962_JaffaCakes118.exe

description	ioc	Process
Set value (str)	\REGISTRY\USER\S-1-5-21-3692679935-4019334568-335155002-1000\Software\Microsoft\Windows\CurrentVersion\Run\smss = "\"C:\\Windows\\twain_32\\smss.exe\""	88d152d4ca2aad8c3aec5567cf9d6962_JaffaCakes118.exe
Set value (str)	\REGISTRY\USER\S-1-5-21-3692679935-4019334568-335155002-1000\Software\Microsoft\Windows\CurrentVersion\Run\lsass = "\"C:\\Users\\Admin\\Start Menu\\lsass.exe\""	88d152d4ca2aad8c3aec5567cf9d6962_JaffaCakes118.exe
Set value (str)	\REGISTRY\USER\S-1-5-21-3692679935-4019334568-335155002-1000\Software\Microsoft\Windows\CurrentVersion\Run\wininit = "\"C:\\PerfLogs\\Admin\\wininit.exe\""	88d152d4ca2aad8c3aec5567cf9d6962_JaffaCakes118.exe
Set value (str)	\REGISTRY\USER\S-1-5-21-3692679935-4019334568-335155002-1000\Software\Microsoft\Windows\CurrentVersion\Run\dllhost = "\"C:\\Users\\All Users\\dllhost.exe\""	88d152d4ca2aad8c3aec5567cf9d6962_JaffaCakes118.exe

Drops file in Windows directory 2 IoCs

Processes:

88d152d4ca2aad8c3aec5567cf9d6962_JaffaCakes118.exe

description	ioc	Process
File created	C:\Windows\twain_32\smss.exe	88d152d4ca2aad8c3aec5567cf9d6962_JaffaCakes118.exe
File created	C:\Windows\twain_32\69ddcba757bf72f7d36c464c71f42baab150b2b9	88d152d4ca2aad8c3aec5567cf9d6962_JaffaCakes118.exe

Scheduled Task/Job: Scheduled Task 1 TTPs 4 IoCs

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

persistence execution

Scheduled Task

T1053.005

Processes:

schtasks.exeschtasks.exeschtasks.exeschtasks.exe

pid	Process
2884	schtasks.exe
2772	schtasks.exe
2840	schtasks.exe
2748	schtasks.exe

Suspicious behavior: EnumeratesProcesses 2 IoCs

Processes:

88d152d4ca2aad8c3aec5567cf9d6962_JaffaCakes118.exesmss.exe

pid	Process
2236	88d152d4ca2aad8c3aec5567cf9d6962_JaffaCakes118.exe
2812	smss.exe

Suspicious use of AdjustPrivilegeToken 2 IoCs

Processes:

88d152d4ca2aad8c3aec5567cf9d6962_JaffaCakes118.exesmss.exe

description	pid	Process
Token: SeDebugPrivilege	2236	88d152d4ca2aad8c3aec5567cf9d6962_JaffaCakes118.exe
Token: SeDebugPrivilege	2812	smss.exe

Suspicious use of WriteProcessMemory 15 IoCs

Processes:

88d152d4ca2aad8c3aec5567cf9d6962_JaffaCakes118.exe

description	pid	Process	procid_target
PID 2236 wrote to memory of 2884	2236	88d152d4ca2aad8c3aec5567cf9d6962_JaffaCakes118.exe	30
PID 2236 wrote to memory of 2884	2236	88d152d4ca2aad8c3aec5567cf9d6962_JaffaCakes118.exe	30
PID 2236 wrote to memory of 2884	2236	88d152d4ca2aad8c3aec5567cf9d6962_JaffaCakes118.exe	30
PID 2236 wrote to memory of 2772	2236	88d152d4ca2aad8c3aec5567cf9d6962_JaffaCakes118.exe	32
PID 2236 wrote to memory of 2772	2236	88d152d4ca2aad8c3aec5567cf9d6962_JaffaCakes118.exe	32
PID 2236 wrote to memory of 2772	2236	88d152d4ca2aad8c3aec5567cf9d6962_JaffaCakes118.exe	32
PID 2236 wrote to memory of 2840	2236	88d152d4ca2aad8c3aec5567cf9d6962_JaffaCakes118.exe	34
PID 2236 wrote to memory of 2840	2236	88d152d4ca2aad8c3aec5567cf9d6962_JaffaCakes118.exe	34
PID 2236 wrote to memory of 2840	2236	88d152d4ca2aad8c3aec5567cf9d6962_JaffaCakes118.exe	34
PID 2236 wrote to memory of 2748	2236	88d152d4ca2aad8c3aec5567cf9d6962_JaffaCakes118.exe	36
PID 2236 wrote to memory of 2748	2236	88d152d4ca2aad8c3aec5567cf9d6962_JaffaCakes118.exe	36
PID 2236 wrote to memory of 2748	2236	88d152d4ca2aad8c3aec5567cf9d6962_JaffaCakes118.exe	36
PID 2236 wrote to memory of 2812	2236	88d152d4ca2aad8c3aec5567cf9d6962_JaffaCakes118.exe	38
PID 2236 wrote to memory of 2812	2236	88d152d4ca2aad8c3aec5567cf9d6962_JaffaCakes118.exe	38
PID 2236 wrote to memory of 2812	2236	88d152d4ca2aad8c3aec5567cf9d6962_JaffaCakes118.exe	38

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\88d152d4ca2aad8c3aec5567cf9d6962_JaffaCakes118.exe
"C:\Users\Admin\AppData\Local\Temp\88d152d4ca2aad8c3aec5567cf9d6962_JaffaCakes118.exe"
1⤵
- Adds Run key to start application
- Drops file in Windows directory
- Suspicious behavior: EnumeratesProcesses
- Suspicious use of AdjustPrivilegeToken
- Suspicious use of WriteProcessMemory
PID:2236
- C:\Windows\system32\schtasks.exe
  "schtasks" /create /tn "lsass" /sc ONLOGON /tr "'C:\Users\Admin\Start Menu\lsass.exe'" /rl HIGHEST /f
  2⤵
  - Scheduled Task/Job: Scheduled Task
  PID:2884
- C:\Windows\system32\schtasks.exe
  "schtasks" /create /tn "wininit" /sc ONLOGON /tr "'C:\PerfLogs\Admin\wininit.exe'" /rl HIGHEST /f
  2⤵
  - Scheduled Task/Job: Scheduled Task
  PID:2772
- C:\Windows\system32\schtasks.exe
  "schtasks" /create /tn "dllhost" /sc ONLOGON /tr "'C:\Users\All Users\dllhost.exe'" /rl HIGHEST /f
  2⤵
  - Scheduled Task/Job: Scheduled Task
  PID:2840
- C:\Windows\system32\schtasks.exe
  "schtasks" /create /tn "smss" /sc ONLOGON /tr "'C:\Windows\twain_32\smss.exe'" /rl HIGHEST /f
  2⤵
  - Scheduled Task/Job: Scheduled Task
  PID:2748
- C:\Windows\twain_32\smss.exe
  "C:\Windows\twain_32\smss.exe"
  2⤵
  - Executes dropped EXE
  - Suspicious behavior: EnumeratesProcesses
  - Suspicious use of AdjustPrivilegeToken
  PID:2812

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

Lateral Movement

Collection

Command and Control

Exfiltration

Impact

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Downloads

C:\Windows\twain_32\smss.exe

Filesize
365KB

MD5
88d152d4ca2aad8c3aec5567cf9d6962

SHA1
d98c4fdccbe6e012803e889a712919c94b279b78

SHA256
94009d1129caa3d7c53557e6f0bc10c546b70389242959cf710ec19b64d66d7a

SHA512
bbf281515abe55d6b4853368dc74d030b62709976ba413b7b8d5c05105d99980eb19a2b1bf128d09c2e77c3331ad83e590a206f840a6afb9d60ec52d606102fb

Download Submit
memory/2236-0-0x000007FEF64B3000-0x000007FEF64B4000-memory.dmp

Filesize
4KB

Download
memory/2236-1-0x0000000000D60000-0x0000000000DC2000-memory.dmp

Filesize
392KB

Download
memory/2236-2-0x000007FEF64B0000-0x000007FEF6E9C000-memory.dmp

Filesize
9.9MB

Download
memory/2236-3-0x000007FEF64B3000-0x000007FEF64B4000-memory.dmp

Filesize
4KB

Download
memory/2236-16-0x000007FEF64B0000-0x000007FEF6E9C000-memory.dmp

Filesize
9.9MB

Download
memory/2812-15-0x0000000000E50000-0x0000000000EB2000-memory.dmp

Filesize
392KB

Download

Analysis

Sharing

General

Malware Config

Signatures

Processes

Network

MITRE ATT&CK Enterprise v15

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Downloads