dcrat | 8bc4ca0ef9348f4a331f850af113f2134c0aba41f6a1e9dd26f9b34db34b473b

General

Target

8bc4ca0ef9348f4a331f850af113f2134c0aba41f6a1e9dd26f9b34db34b473b.exe
Size

2.0MB
MD5

0707542d6d884c5c595b38ebedd025c9
SHA1

686f867f37c8aca23ea3cc298dec856667c1afcd
SHA256

8bc4ca0ef9348f4a331f850af113f2134c0aba41f6a1e9dd26f9b34db34b473b
SHA512

945eeeadb00c19934d034cfb9bd158246e2fcb989bb8808ce3fffee7707cc4ae1f83310db961ecfbd0bc99304b8c041ec7e4ee83893d1db7eac54910970cccc0
SSDEEP

49152:fA6rKdfybQlb8Em0lP/PHNQsGE6+tlcwDXbuvDtkI:XrKngUlPtQsG831burKI

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 5 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	3968	3032	schtasks.exe	83
Parent C:\Windows\system32\wbem\wmiprvse.exe is not expected to spawn this process	636	3032	schtasks.exe	83
Parent C:\Windows\system32\wbem\wmiprvse.exe is not expected to spawn this process	768	3032	schtasks.exe	83
Parent C:\Windows\system32\wbem\wmiprvse.exe is not expected to spawn this process	4036	3032	schtasks.exe	83
Parent C:\Windows\system32\wbem\wmiprvse.exe is not expected to spawn this process	2224	3032	schtasks.exe	83

DCRat payload 2 IoCs

Detects payload of DCRat, commonly dropped by NSIS installers.

rat

resource	yara_rule
behavioral2/memory/2260-1-0x0000000000730000-0x0000000000942000-memory.dmp	dcrat
behavioral2/files/0x0007000000023ca1-11.dat	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-1-5-21-2045521122-590294423-3465680274-1000\Control Panel\International\Geo\Nation	8bc4ca0ef9348f4a331f850af113f2134c0aba41f6a1e9dd26f9b34db34b473b.exe

Executes dropped EXE 1 IoCs

pid	Process
5044	sysmon.exe

Adds Run key to start application 2 TTPs 5 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\winlogon = "\"C:\\Program Files (x86)\\Internet Explorer\\images\\winlogon.exe\""	8bc4ca0ef9348f4a331f850af113f2134c0aba41f6a1e9dd26f9b34db34b473b.exe
Set value (str)	\REGISTRY\MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Run\csrss = "\"C:\\PerfLogs\\csrss.exe\""	8bc4ca0ef9348f4a331f850af113f2134c0aba41f6a1e9dd26f9b34db34b473b.exe
Set value (str)	\REGISTRY\MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Run\unsecapp = "\"C:\\Recovery\\WindowsRE\\unsecapp.exe\""	8bc4ca0ef9348f4a331f850af113f2134c0aba41f6a1e9dd26f9b34db34b473b.exe
Set value (str)	\REGISTRY\MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Run\explorer = "\"C:\\Windows\\regedit\\explorer.exe\""	8bc4ca0ef9348f4a331f850af113f2134c0aba41f6a1e9dd26f9b34db34b473b.exe
Set value (str)	\REGISTRY\MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Run\sysmon = "\"C:\\PerfLogs\\sysmon.exe\""	8bc4ca0ef9348f4a331f850af113f2134c0aba41f6a1e9dd26f9b34db34b473b.exe

Drops file in Program Files directory 2 IoCs

description	ioc	Process
File created	C:\Program Files (x86)\Internet Explorer\images\winlogon.exe	8bc4ca0ef9348f4a331f850af113f2134c0aba41f6a1e9dd26f9b34db34b473b.exe
File created	C:\Program Files (x86)\Internet Explorer\images\cc11b995f2a76da408ea6a601e682e64743153ad	8bc4ca0ef9348f4a331f850af113f2134c0aba41f6a1e9dd26f9b34db34b473b.exe

Drops file in Windows directory 2 IoCs

description	ioc	Process
File created	C:\Windows\regedit\explorer.exe	8bc4ca0ef9348f4a331f850af113f2134c0aba41f6a1e9dd26f9b34db34b473b.exe
File created	C:\Windows\regedit\7a0fd90576e08807bde2cc57bcf9854bbce05fe3	8bc4ca0ef9348f4a331f850af113f2134c0aba41f6a1e9dd26f9b34db34b473b.exe

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

System Information Discovery
T1082

Modifies registry class 1 IoCs

description	ioc	Process
Key created	\REGISTRY\USER\S-1-5-21-2045521122-590294423-3465680274-1000_Classes\Local Settings	8bc4ca0ef9348f4a331f850af113f2134c0aba41f6a1e9dd26f9b34db34b473b.exe

Scheduled Task/Job: Scheduled Task 1 TTPs 5 IoCs

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

persistence execution

Scheduled Task

T1053.005

pid	Process
3968	schtasks.exe
636	schtasks.exe
768	schtasks.exe
4036	schtasks.exe
2224	schtasks.exe

Suspicious behavior: EnumeratesProcesses 4 IoCs

pid	Process
2260	8bc4ca0ef9348f4a331f850af113f2134c0aba41f6a1e9dd26f9b34db34b473b.exe
2260	8bc4ca0ef9348f4a331f850af113f2134c0aba41f6a1e9dd26f9b34db34b473b.exe
2260	8bc4ca0ef9348f4a331f850af113f2134c0aba41f6a1e9dd26f9b34db34b473b.exe
5044	sysmon.exe

Suspicious use of AdjustPrivilegeToken 2 IoCs

description	pid	Process
Token: SeDebugPrivilege	2260	8bc4ca0ef9348f4a331f850af113f2134c0aba41f6a1e9dd26f9b34db34b473b.exe
Token: SeDebugPrivilege	5044	sysmon.exe

Suspicious use of WriteProcessMemory 6 IoCs

description	pid	Process	procid_target
PID 2260 wrote to memory of 4084	2260	8bc4ca0ef9348f4a331f850af113f2134c0aba41f6a1e9dd26f9b34db34b473b.exe	89
PID 2260 wrote to memory of 4084	2260	8bc4ca0ef9348f4a331f850af113f2134c0aba41f6a1e9dd26f9b34db34b473b.exe	89
PID 4084 wrote to memory of 5084	4084	cmd.exe	91
PID 4084 wrote to memory of 5084	4084	cmd.exe	91
PID 4084 wrote to memory of 5044	4084	cmd.exe	98
PID 4084 wrote to memory of 5044	4084	cmd.exe	98

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\8bc4ca0ef9348f4a331f850af113f2134c0aba41f6a1e9dd26f9b34db34b473b.exe
"C:\Users\Admin\AppData\Local\Temp\8bc4ca0ef9348f4a331f850af113f2134c0aba41f6a1e9dd26f9b34db34b473b.exe"
1⤵
- Checks computer location settings
- Adds Run key to start application
- Drops file in Program Files directory
- Drops file in Windows directory
- Modifies registry class
- Suspicious behavior: EnumeratesProcesses
- Suspicious use of AdjustPrivilegeToken
- Suspicious use of WriteProcessMemory
PID:2260
- C:\Windows\System32\cmd.exe
  "C:\Windows\System32\cmd.exe" /C "C:\Users\Admin\AppData\Local\Temp\zRUqbQhuVW.bat"
  2⤵
  - Suspicious use of WriteProcessMemory
  PID:4084
- - C:\Windows\system32\w32tm.exe
    w32tm /stripchart /computer:localhost /period:5 /dataonly /samples:2
    3⤵
    PID:5084
- - C:\PerfLogs\sysmon.exe
    "C:\PerfLogs\sysmon.exe"
    3⤵
    - Executes dropped EXE
    - Suspicious behavior: EnumeratesProcesses
    - Suspicious use of AdjustPrivilegeToken
    PID:5044

C:\Windows\system32\schtasks.exe
schtasks.exe /create /tn "sysmon" /sc ONLOGON /tr "'C:\PerfLogs\sysmon.exe'" /rl HIGHEST /f
1⤵
- Process spawned unexpected child process
- Scheduled Task/Job: Scheduled Task
PID:3968

C:\Windows\system32\schtasks.exe
schtasks.exe /create /tn "winlogon" /sc ONLOGON /tr "'C:\Program Files (x86)\Internet Explorer\images\winlogon.exe'" /rl HIGHEST /f
1⤵
- Process spawned unexpected child process
- Scheduled Task/Job: Scheduled Task
PID:636

C:\Windows\system32\schtasks.exe
schtasks.exe /create /tn "csrss" /sc ONLOGON /tr "'C:\PerfLogs\csrss.exe'" /rl HIGHEST /f
1⤵
- Process spawned unexpected child process
- Scheduled Task/Job: Scheduled Task
PID:768

C:\Windows\system32\schtasks.exe
schtasks.exe /create /tn "unsecapp" /sc ONLOGON /tr "'C:\Recovery\WindowsRE\unsecapp.exe'" /rl HIGHEST /f
1⤵
- Process spawned unexpected child process
- Scheduled Task/Job: Scheduled Task
PID:4036

C:\Windows\system32\schtasks.exe
schtasks.exe /create /tn "explorer" /sc ONLOGON /tr "'C:\Windows\regedit\explorer.exe'" /rl HIGHEST /f
1⤵
- Process spawned unexpected child process
- Scheduled Task/Job: Scheduled Task
PID:2224

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

2

T1012

System Information Discovery

2

T1082

Lateral Movement

Collection

Command and Control

Exfiltration

Impact

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Downloads

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

Filesize
186B

MD5
f1be6b86b4c8c44045bd2529493a1e19

SHA1
acd634b6091506179f828929a5cc4df1984d4f1b

SHA256
3f8c06428d82e0b057e82df39a05564f142d0c30c3c8a77529c308682a35d3d0

SHA512
0f58ccb5e4a4b67982dede090ae7aa67958d7982f42f142046794b58eeae5d0fe4aac01d03244f32f021ade7e056893cc647cf5eea9d9c78b6a1b17dc1d4bd23

Download Submit
C:\Windows\regedit\explorer.exe

Filesize
2.0MB

MD5
0707542d6d884c5c595b38ebedd025c9

SHA1
686f867f37c8aca23ea3cc298dec856667c1afcd

SHA256
8bc4ca0ef9348f4a331f850af113f2134c0aba41f6a1e9dd26f9b34db34b473b

SHA512
945eeeadb00c19934d034cfb9bd158246e2fcb989bb8808ce3fffee7707cc4ae1f83310db961ecfbd0bc99304b8c041ec7e4ee83893d1db7eac54910970cccc0

Download Submit
memory/2260-0-0x00007FF940713000-0x00007FF940715000-memory.dmp

Filesize
8KB

Download
memory/2260-1-0x0000000000730000-0x0000000000942000-memory.dmp

Filesize
2.1MB

Download
memory/2260-4-0x00007FF940710000-0x00007FF9411D1000-memory.dmp

Filesize
10.8MB

Download
memory/2260-19-0x00007FF940710000-0x00007FF9411D1000-memory.dmp

Filesize
10.8MB

Download
memory/5044-23-0x0000000002B10000-0x0000000002B1C000-memory.dmp

Filesize
48KB

Download
memory/5044-24-0x0000000002B30000-0x0000000002B3C000-memory.dmp

Filesize
48KB

Download
memory/5044-25-0x0000000002B70000-0x0000000002B78000-memory.dmp

Filesize
32KB

Download
memory/5044-26-0x0000000002C90000-0x0000000002CE6000-memory.dmp

Filesize
344KB

Download
memory/5044-28-0x0000000002B60000-0x0000000002B68000-memory.dmp

Filesize
32KB

Download
memory/5044-27-0x0000000002B20000-0x0000000002B2A000-memory.dmp

Filesize
40KB

Download
memory/5044-29-0x0000000002CE0000-0x0000000002CE8000-memory.dmp

Filesize
32KB

Download

Analysis

Sharing

General

Malware Config

Signatures

Processes

Network

MITRE ATT&CK Enterprise v15

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Downloads