dcrat | 65fa57c7a8ac3956292be0a17e56f35fff14fb060cd6022889665901a6ecda5c

General

Target

65fa57c7a8ac3956292be0a17e56f35fff14fb060cd6022889665901a6ecda5c.exe
Size

1.4MB
MD5

4ad4cc9b5b82fc59756523b5b49da103
SHA1

239321573ab48845b649af41908eecadd972dc04
SHA256

65fa57c7a8ac3956292be0a17e56f35fff14fb060cd6022889665901a6ecda5c
SHA512

96c8164723c4ada3ab78a63a94e8b35ed41bebdbdf1591f452453a0209f264120572e1c11e60962ca8b1e2fd96f686f1627eab94d0fbeb86e1c931d803a0ca4b
SSDEEP

24576:U2G/nvxW3Ww0teOtQEIQ/E8pi63hn89pN3bfqaeTBHLChWFBAtlIBGIP5M:UbA30cn8Y6d89f3e5LhFSnIBhG

Score

10^/10

dcrat discovery 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

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	2992	1504	schtasks.exe	89
Parent C:\Windows\system32\wbem\wmiprvse.exe is not expected to spawn this process	2180	1504	schtasks.exe	89
Parent C:\Windows\system32\wbem\wmiprvse.exe is not expected to spawn this process	548	1504	schtasks.exe	89
Parent C:\Windows\system32\wbem\wmiprvse.exe is not expected to spawn this process	1728	1504	schtasks.exe	89
Parent C:\Windows\system32\wbem\wmiprvse.exe is not expected to spawn this process	732	1504	schtasks.exe	89
Parent C:\Windows\system32\wbem\wmiprvse.exe is not expected to spawn this process	1052	1504	schtasks.exe	89

DCRat payload 2 IoCs

Detects payload of DCRat, commonly dropped by NSIS installers.

rat

resource	yara_rule
behavioral2/files/0x0007000000023c7a-10.dat	dcrat
behavioral2/memory/3712-13-0x00000000000A0000-0x00000000001C4000-memory.dmp	dcrat

Checks computer location settings 2 TTPs 3 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	WScript.exe
Key value queried	\REGISTRY\USER\S-1-5-21-2045521122-590294423-3465680274-1000\Control Panel\International\Geo\Nation	bridgereviewwin.exe
Key value queried	\REGISTRY\USER\S-1-5-21-2045521122-590294423-3465680274-1000\Control Panel\International\Geo\Nation	65fa57c7a8ac3956292be0a17e56f35fff14fb060cd6022889665901a6ecda5c.exe

Executes dropped EXE 2 IoCs

pid	Process
3712	bridgereviewwin.exe
3268	csrss.exe

Drops file in Windows directory 2 IoCs

description	ioc	Process
File created	C:\Windows\L2Schemas\886983d96e3d3e	bridgereviewwin.exe
File created	C:\Windows\L2Schemas\csrss.exe	bridgereviewwin.exe

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

System Information Discovery
T1082

System Location Discovery: System Language Discovery 1 TTPs 3 IoCs

Attempt gather information about the system language of a victim in order to infer the geographical location of that host.

discovery

System Language Discovery

T1614.001

description	ioc	Process
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	65fa57c7a8ac3956292be0a17e56f35fff14fb060cd6022889665901a6ecda5c.exe
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	WScript.exe
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	cmd.exe

Modifies registry class 1 IoCs

description	ioc	Process
Key created	\REGISTRY\USER\S-1-5-21-2045521122-590294423-3465680274-1000_Classes\Local Settings	65fa57c7a8ac3956292be0a17e56f35fff14fb060cd6022889665901a6ecda5c.exe

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
1728	schtasks.exe
732	schtasks.exe
1052	schtasks.exe
2992	schtasks.exe
2180	schtasks.exe
548	schtasks.exe

Suspicious behavior: EnumeratesProcesses 10 IoCs

pid	Process
3712	bridgereviewwin.exe
3268	csrss.exe
3268	csrss.exe
3268	csrss.exe
3268	csrss.exe
3268	csrss.exe
3268	csrss.exe
3268	csrss.exe
3268	csrss.exe
3268	csrss.exe

Suspicious use of AdjustPrivilegeToken 2 IoCs

description	pid	Process
Token: SeDebugPrivilege	3712	bridgereviewwin.exe
Token: SeDebugPrivilege	3268	csrss.exe

Suspicious use of WriteProcessMemory 10 IoCs

description	pid	Process	procid_target
PID 4944 wrote to memory of 1196	4944	65fa57c7a8ac3956292be0a17e56f35fff14fb060cd6022889665901a6ecda5c.exe	83
PID 4944 wrote to memory of 1196	4944	65fa57c7a8ac3956292be0a17e56f35fff14fb060cd6022889665901a6ecda5c.exe	83
PID 4944 wrote to memory of 1196	4944	65fa57c7a8ac3956292be0a17e56f35fff14fb060cd6022889665901a6ecda5c.exe	83
PID 1196 wrote to memory of 3632	1196	WScript.exe	92
PID 1196 wrote to memory of 3632	1196	WScript.exe	92
PID 1196 wrote to memory of 3632	1196	WScript.exe	92
PID 3632 wrote to memory of 3712	3632	cmd.exe	95
PID 3632 wrote to memory of 3712	3632	cmd.exe	95
PID 3712 wrote to memory of 3268	3712	bridgereviewwin.exe	102
PID 3712 wrote to memory of 3268	3712	bridgereviewwin.exe	102

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\65fa57c7a8ac3956292be0a17e56f35fff14fb060cd6022889665901a6ecda5c.exe
"C:\Users\Admin\AppData\Local\Temp\65fa57c7a8ac3956292be0a17e56f35fff14fb060cd6022889665901a6ecda5c.exe"
1⤵
- Checks computer location settings
- System Location Discovery: System Language Discovery
- Modifies registry class
- Suspicious use of WriteProcessMemory
PID:4944
- C:\Windows\SysWOW64\WScript.exe
  "C:\Windows\System32\WScript.exe" "C:\providerbrowserWebFont\YIgtMaExFJFBncNn1em9wJcGNWr3f.vbe"
  2⤵
  - Checks computer location settings
  - System Location Discovery: System Language Discovery
  - Suspicious use of WriteProcessMemory
  PID:1196
- - C:\Windows\SysWOW64\cmd.exe
    C:\Windows\system32\cmd.exe /c ""C:\providerbrowserWebFont\5cmX3eeCizBMduOP4xHF1p.bat" "
    3⤵
    - System Location Discovery: System Language Discovery
    - Suspicious use of WriteProcessMemory
    PID:3632
  - - C:\providerbrowserWebFont\bridgereviewwin.exe
      "C:\providerbrowserWebFont\bridgereviewwin.exe"
      4⤵
      Checks computer location settings
      Executes dropped EXE
      Drops file in Windows directory
      Suspicious behavior: EnumeratesProcesses
      Suspicious use of AdjustPrivilegeToken
      Suspicious use of WriteProcessMemory
      PID:3712
    - - C:\Windows\L2Schemas\csrss.exe
        
        "C:\Windows\L2Schemas\csrss.exe"
        5⤵
        Executes dropped EXE
        Suspicious behavior: EnumeratesProcesses
        Suspicious use of AdjustPrivilegeToken
        
        PID:3268

C:\Windows\system32\schtasks.exe
schtasks.exe /create /tn "servicess" /sc MINUTE /mo 11 /tr "'C:\Users\All Users\Microsoft\Device Stage\Task\{e35be42d-f742-4d96-a50a-1775fb1a7a42}\services.exe'" /f
1⤵
- Process spawned unexpected child process
- Scheduled Task/Job: Scheduled Task
PID:2992

C:\Windows\system32\schtasks.exe
schtasks.exe /create /tn "services" /sc ONLOGON /tr "'C:\Users\All Users\Microsoft\Device Stage\Task\{e35be42d-f742-4d96-a50a-1775fb1a7a42}\services.exe'" /rl HIGHEST /f
1⤵
- Process spawned unexpected child process
- Scheduled Task/Job: Scheduled Task
PID:2180

C:\Windows\system32\schtasks.exe
schtasks.exe /create /tn "servicess" /sc MINUTE /mo 9 /tr "'C:\Users\All Users\Microsoft\Device Stage\Task\{e35be42d-f742-4d96-a50a-1775fb1a7a42}\services.exe'" /rl HIGHEST /f
1⤵
- Process spawned unexpected child process
- Scheduled Task/Job: Scheduled Task
PID:548

C:\Windows\system32\schtasks.exe
schtasks.exe /create /tn "csrssc" /sc MINUTE /mo 6 /tr "'C:\Windows\L2Schemas\csrss.exe'" /f
1⤵
- Process spawned unexpected child process
- Scheduled Task/Job: Scheduled Task
PID:1728

C:\Windows\system32\schtasks.exe
schtasks.exe /create /tn "csrss" /sc ONLOGON /tr "'C:\Windows\L2Schemas\csrss.exe'" /rl HIGHEST /f
1⤵
- Process spawned unexpected child process
- Scheduled Task/Job: Scheduled Task
PID:732

C:\Windows\system32\schtasks.exe
schtasks.exe /create /tn "csrssc" /sc MINUTE /mo 12 /tr "'C:\Windows\L2Schemas\csrss.exe'" /rl HIGHEST /f
1⤵
- Process spawned unexpected child process
- Scheduled Task/Job: Scheduled Task
PID:1052

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

System Location Discovery

1

T1614

System Language Discovery

1

T1614.001

Lateral Movement

Collection

Command and Control

Exfiltration

Impact

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Downloads

C:\providerbrowserWebFont\5cmX3eeCizBMduOP4xHF1p.bat

Filesize
47B

MD5
e9d505caa65e63b5d93b82e1877f2062

SHA1
0276dfd379ea89be367b66950300a1455a583571

SHA256
21badcf7822aac68d4d060e89fd6f04df3ff68dcd39217ba3863d7503237d101

SHA512
077eb5a528e0015e7c6f8ead1b2351d16abf0a05b6132e04a640b9c40a12234091bae5f9268eeb61b75886449320465619cacdacb7733b502d76b7bc3016d917

Download Submit
C:\providerbrowserWebFont\YIgtMaExFJFBncNn1em9wJcGNWr3f.vbe

Filesize
221B

MD5
06865e53406b18d46604d04a3bd9b396

SHA1
d9e26ebaa48e997333364143c3d8441eb984dca7

SHA256
956279f84b64c8db50862edddfcd9fc43266cab11fced78a0e6d3d2a47e429cc

SHA512
1d8b16ed4aa71712900c394b61f2133c305644fc28266ee95e314c09cbb7671d69ed199a544fdbbc618c1ebb803935203da723909da94b2d9d2b3dbec4f7284b

Download Submit
C:\providerbrowserWebFont\bridgereviewwin.exe

Filesize
1.1MB

MD5
8a6b7ad242f380978aa7318c3fdafe4f

SHA1
c78489883e9ce873f7a67c0d3ad662adef9a0c61

SHA256
f7a4bc7bacb5fce2daafe9b4db183f60f87528a02832e814417d089a6f6bc2b3

SHA512
198e5fe3fb97f7541ec69511a60cb3baffed07046560f6f4455cc403f71d66f17ddf733511d6bd810312028d22d013897be28e66ddcb6eaa1ba5a91b0ab2079c

Download Submit
memory/3712-12-0x00007FF9DE8E3000-0x00007FF9DE8E5000-memory.dmp

Filesize
8KB

Download
memory/3712-13-0x00000000000A0000-0x00000000001C4000-memory.dmp

Filesize
1.1MB

Download
memory/3712-14-0x0000000000A30000-0x0000000000A4C000-memory.dmp

Filesize
112KB

Download
memory/3712-15-0x00000000024A0000-0x00000000024F0000-memory.dmp

Filesize
320KB

Download
memory/3712-16-0x0000000000A70000-0x0000000000A86000-memory.dmp

Filesize
88KB

Download

Analysis

Sharing

General

Malware Config

Signatures

Processes

Network

MITRE ATT&CK Enterprise v15

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Downloads