dcrat | 9464744616b18af752a573ee701b6cb66b5f6a9b4283c0979eafb9eed700ea9e

General

Target

79fbaeb0179ede82ef64517bb767cb22_JaffaCakes118.exe
Size

1.1MB
MD5

79fbaeb0179ede82ef64517bb767cb22
SHA1

4d7f8d7c5e7e068d12fd7825331fae47523a5669
SHA256

9464744616b18af752a573ee701b6cb66b5f6a9b4283c0979eafb9eed700ea9e
SHA512

32ec095bed57e0ae2f3b5a972894474ccf309f525420a19fba8cc5d80ffe0e855acf06909f9ff61423a930dc288c96fe9d6b4b3fd17e830a0bda621e8190a066
SSDEEP

12288:F2n8iaYegKbzRUM7iXmuOL9t5CdPQIWdBtgM+unGyloYhe/7ey+KrSpZdFY1UaQt:FkdaeOJte0GNYheyy+KSpZdFY1Ud

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
Dcrat family
dcrat

DCRat payload 2 IoCs

Detects payload of DCRat, commonly dropped by NSIS installers.

rat

resource	yara_rule
behavioral2/files/0x000d000000023b6a-5.dat	dcrat
behavioral2/memory/1100-8-0x0000000000630000-0x00000000006FE000-memory.dmp	dcrat

Checks computer location settings 2 TTPs 1 IoCs

Looks up country code configured in the registry, likely geofence.

Query Registry

T1012

System Information Discovery

T1082

description	ioc	Process
Key value queried	\REGISTRY\USER\S-1-5-21-3442511616-637977696-3186306149-1000\Control Panel\International\Geo\Nation	WinNetCommonFiles.exe

Executes dropped EXE 2 IoCs

pid	Process
1100	WinNetCommonFiles.exe
3688	sppsvc.exe

Drops file in System32 directory 6 IoCs

description	ioc	Process
File created	C:\Windows\System32\winsrvext\WaaSMedicAgent.exe	WinNetCommonFiles.exe
File created	C:\Windows\System32\winsrvext\c82b8037eab33d1fe33ed5c436875fcafdbefbee	WinNetCommonFiles.exe
File created	C:\Windows\System32\dxdiag\RuntimeBroker.exe	WinNetCommonFiles.exe
File created	C:\Windows\System32\dxdiag\9e8d7a4ca61bd92aff00cc37a7a4d62a2cac998d	WinNetCommonFiles.exe
File created	C:\Windows\System32\CXHProvisioningServer\RuntimeBroker.exe	WinNetCommonFiles.exe
File created	C:\Windows\System32\CXHProvisioningServer\9e8d7a4ca61bd92aff00cc37a7a4d62a2cac998d	WinNetCommonFiles.exe

Drops file in Program Files directory 2 IoCs

description	ioc	Process
File created	C:\Program Files\dotnet\host\fxr\8.0.2\spoolsv.exe	WinNetCommonFiles.exe
File created	C:\Program Files\dotnet\host\fxr\8.0.2\f3b6ecef712a24f33798f5d2fb3790c3d9b894c4	WinNetCommonFiles.exe

Drops file in Windows directory 5 IoCs

description	ioc	Process
File created	C:\Windows\DtcInstall\121e5b5079f7c0e46d90f99b3864022518bbbda9	WinNetCommonFiles.exe
File created	C:\Windows\de-DE\sppsvc.exe	WinNetCommonFiles.exe
File opened for modification	C:\Windows\de-DE\sppsvc.exe	WinNetCommonFiles.exe
File created	C:\Windows\de-DE\0a1fd5f707cd16ea89afd3d6db52b2da58214a6c	WinNetCommonFiles.exe
File created	C:\Windows\DtcInstall\sysmon.exe	WinNetCommonFiles.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
1064	schtasks.exe
1428	schtasks.exe
3916	schtasks.exe
4208	schtasks.exe
828	schtasks.exe
2384	schtasks.exe

Suspicious behavior: EnumeratesProcesses 4 IoCs

pid	Process
1100	WinNetCommonFiles.exe
1100	WinNetCommonFiles.exe
1100	WinNetCommonFiles.exe
3688	sppsvc.exe

Suspicious use of AdjustPrivilegeToken 2 IoCs

description	pid	Process
Token: SeDebugPrivilege	1100	WinNetCommonFiles.exe
Token: SeDebugPrivilege	3688	sppsvc.exe

Suspicious use of WriteProcessMemory 16 IoCs

description	pid	Process	procid_target
PID 4036 wrote to memory of 1100	4036	79fbaeb0179ede82ef64517bb767cb22_JaffaCakes118.exe	87
PID 4036 wrote to memory of 1100	4036	79fbaeb0179ede82ef64517bb767cb22_JaffaCakes118.exe	87
PID 1100 wrote to memory of 828	1100	WinNetCommonFiles.exe	92
PID 1100 wrote to memory of 828	1100	WinNetCommonFiles.exe	92
PID 1100 wrote to memory of 2384	1100	WinNetCommonFiles.exe	94
PID 1100 wrote to memory of 2384	1100	WinNetCommonFiles.exe	94
PID 1100 wrote to memory of 1064	1100	WinNetCommonFiles.exe	96
PID 1100 wrote to memory of 1064	1100	WinNetCommonFiles.exe	96
PID 1100 wrote to memory of 1428	1100	WinNetCommonFiles.exe	98
PID 1100 wrote to memory of 1428	1100	WinNetCommonFiles.exe	98
PID 1100 wrote to memory of 3916	1100	WinNetCommonFiles.exe	100
PID 1100 wrote to memory of 3916	1100	WinNetCommonFiles.exe	100
PID 1100 wrote to memory of 4208	1100	WinNetCommonFiles.exe	102
PID 1100 wrote to memory of 4208	1100	WinNetCommonFiles.exe	102
PID 1100 wrote to memory of 3688	1100	WinNetCommonFiles.exe	104
PID 1100 wrote to memory of 3688	1100	WinNetCommonFiles.exe	104

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\79fbaeb0179ede82ef64517bb767cb22_JaffaCakes118.exe
"C:\Users\Admin\AppData\Local\Temp\79fbaeb0179ede82ef64517bb767cb22_JaffaCakes118.exe"
1⤵
- Suspicious use of WriteProcessMemory
PID:4036
- C:\Users\Admin\AppData\Roaming\WinNetCommonFiles\WinNetCommonFiles.exe
  "C:\Users\Admin\AppData\Roaming\WinNetCommonFiles\WinNetCommonFiles.exe"
  2⤵
  - Checks computer location settings
  - Executes dropped EXE
  - Drops file in System32 directory
  - Drops file in Program Files directory
  - Drops file in Windows directory
  - Suspicious behavior: EnumeratesProcesses
  - Suspicious use of AdjustPrivilegeToken
  - Suspicious use of WriteProcessMemory
  PID:1100
- - C:\Windows\SYSTEM32\schtasks.exe
    "schtasks" /create /tn "sppsvc" /sc ONLOGON /tr "'C:\Windows\de-DE\sppsvc.exe'" /rl HIGHEST /f
    3⤵
    - Scheduled Task/Job: Scheduled Task
    PID:828
- - C:\Windows\SYSTEM32\schtasks.exe
    "schtasks" /create /tn "WaaSMedicAgent" /sc ONLOGON /tr "'C:\Windows\System32\winsrvext\WaaSMedicAgent.exe'" /rl HIGHEST /f
    3⤵
    - Scheduled Task/Job: Scheduled Task
    PID:2384
- - C:\Windows\SYSTEM32\schtasks.exe
    "schtasks" /create /tn "sysmon" /sc ONLOGON /tr "'C:\Windows\DtcInstall\sysmon.exe'" /rl HIGHEST /f
    3⤵
    - Scheduled Task/Job: Scheduled Task
    PID:1064
- - C:\Windows\SYSTEM32\schtasks.exe
    "schtasks" /create /tn "RuntimeBroker" /sc ONLOGON /tr "'C:\Windows\System32\dxdiag\RuntimeBroker.exe'" /rl HIGHEST /f
    3⤵
    - Scheduled Task/Job: Scheduled Task
    PID:1428
- - C:\Windows\SYSTEM32\schtasks.exe
    "schtasks" /create /tn "spoolsv" /sc ONLOGON /tr "'C:\Program Files\dotnet\host\fxr\8.0.2\spoolsv.exe'" /rl HIGHEST /f
    3⤵
    - Scheduled Task/Job: Scheduled Task
    PID:3916
- - C:\Windows\SYSTEM32\schtasks.exe
    "schtasks" /create /tn "RuntimeBroker" /sc ONLOGON /tr "'C:\Windows\System32\CXHProvisioningServer\RuntimeBroker.exe'" /rl HIGHEST /f
    3⤵
    - Scheduled Task/Job: Scheduled Task
    PID:4208
- - C:\Windows\de-DE\sppsvc.exe
    "C:\Windows\de-DE\sppsvc.exe"
    3⤵
    - Executes dropped EXE
    - Suspicious behavior: EnumeratesProcesses
    - Suspicious use of AdjustPrivilegeToken
    PID:3688

Network

MITRE ATT&CK Enterprise v15

Reconnaissance

Resource Development

Initial Access

Execution

Scheduled Task/Job

1

T1053

Scheduled Task

1

T1053.005

Persistence

Scheduled Task/Job

1

T1053

Scheduled Task

1

T1053.005

Privilege Escalation

Scheduled Task/Job

1

T1053

Scheduled Task

1

T1053.005

Defense Evasion

Credential Access

Discovery

Query Registry

2

T1012

System Information Discovery

2

T1082

Lateral Movement

Collection

Command and Control

Exfiltration

Impact

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Downloads

C:\Users\Admin\AppData\Roaming\WinNetCommonFiles\WinNetCommonFiles.exe

Filesize
801KB

MD5
44994de5c6182968cdeb022deeb25536

SHA1
0f347814c45c30dd76becbf3acc3381a3af8a972

SHA256
f807a67ed9567fcd8003beb9c0e7064de1c0eff5c282ddc502084b3475db0e4a

SHA512
0f883b85fef9f5fd32ad9f9eb7003afc44542ca3bf5e19f8836e32f6b69ed77821ba04fcba77dfad90b13827a5bad7d129f033190bd54d5cf23b454b2e402d08

Download Submit
memory/1100-7-0x00007FF9A05F0000-0x00007FF9A10B1000-memory.dmp

Filesize
10.8MB

Download
memory/1100-8-0x0000000000630000-0x00000000006FE000-memory.dmp

Filesize
824KB

Download
memory/1100-11-0x00007FF9A05F0000-0x00007FF9A10B1000-memory.dmp

Filesize
10.8MB

Download
memory/1100-35-0x00007FF9A05F0000-0x00007FF9A10B1000-memory.dmp

Filesize
10.8MB

Download
memory/4036-0-0x00007FF9A05F3000-0x00007FF9A05F5000-memory.dmp

Filesize
8KB

Download
memory/4036-1-0x0000000000D50000-0x0000000000E68000-memory.dmp

Filesize
1.1MB

Download
memory/4036-2-0x00007FF9A05F0000-0x00007FF9A10B1000-memory.dmp

Filesize
10.8MB

Download
memory/4036-10-0x00007FF9A05F0000-0x00007FF9A10B1000-memory.dmp

Filesize
10.8MB

Download

Analysis

Sharing

General

Malware Config

Signatures

Processes

Network

MITRE ATT&CK Enterprise v15

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Downloads