dcrat | f9de98bb8b3a6918df525169f13fdb4f2a0389025b2d39c33c129c4c877cc356

General

Target

f9de98bb8b3a6918df525169f13fdb4f2a0389025b2d39c33c129c4c877cc356.exe
Size

2.0MB
MD5

b1ee79054f4b22b3288337c0d0a70619
SHA1

0cbe1c16fc78a1fc15974e2b452fd6a20011571a
SHA256

f9de98bb8b3a6918df525169f13fdb4f2a0389025b2d39c33c129c4c877cc356
SHA512

4961a2bb7ce3148388f43fcb2ee001745c9b5bad575ce4f704d0affd63df3ec858ef039c5099d38bd827bbd2a05d57e4ac2162040ac785d9289bb2b9e2a68335
SSDEEP

24576:U2G/nvxW3Ww0t042y0hlXx+FY8ghJwOvPBE4oL1agNTUL/5aH/abU:UbA30db0hogRBaDGTU

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	1552	1336	schtasks.exe	87
Parent C:\Windows\system32\wbem\wmiprvse.exe is not expected to spawn this process	916	1336	schtasks.exe	87
Parent C:\Windows\system32\wbem\wmiprvse.exe is not expected to spawn this process	4180	1336	schtasks.exe	87
Parent C:\Windows\system32\wbem\wmiprvse.exe is not expected to spawn this process	1700	1336	schtasks.exe	87
Parent C:\Windows\system32\wbem\wmiprvse.exe is not expected to spawn this process	388	1336	schtasks.exe	87
Parent C:\Windows\system32\wbem\wmiprvse.exe is not expected to spawn this process	4512	1336	schtasks.exe	87

DCRat payload 2 IoCs

Detects payload of DCRat, commonly dropped by NSIS installers.

rat

resource	yara_rule
behavioral2/files/0x0007000000023ca6-14.dat	dcrat
behavioral2/memory/264-17-0x0000000000220000-0x00000000003D2000-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-1-5-21-3442511616-637977696-3186306149-1000\Control Panel\International\Geo\Nation	f9de98bb8b3a6918df525169f13fdb4f2a0389025b2d39c33c129c4c877cc356.exe
Key value queried	\REGISTRY\USER\S-1-5-21-3442511616-637977696-3186306149-1000\Control Panel\International\Geo\Nation	WScript.exe
Key value queried	\REGISTRY\USER\S-1-5-21-3442511616-637977696-3186306149-1000\Control Panel\International\Geo\Nation	Browserrefperf.exe

Executes dropped EXE 2 IoCs

pid	Process
264	Browserrefperf.exe
1124	csrss.exe

Drops file in Program Files directory 2 IoCs

description	ioc	Process
File created	C:\Program Files\Common Files\microsoft shared\TextConv\en-US\56085415360792	Browserrefperf.exe
File created	C:\Program Files\Common Files\microsoft shared\TextConv\en-US\wininit.exe	Browserrefperf.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 4 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	WScript.exe
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	cmd.exe
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	f9de98bb8b3a6918df525169f13fdb4f2a0389025b2d39c33c129c4c877cc356.exe
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	WScript.exe

Modifies registry class 2 IoCs

description	ioc	Process
Key created	\REGISTRY\USER\S-1-5-21-3442511616-637977696-3186306149-1000_Classes\Local Settings	f9de98bb8b3a6918df525169f13fdb4f2a0389025b2d39c33c129c4c877cc356.exe
Key created	\REGISTRY\USER\S-1-5-21-3442511616-637977696-3186306149-1000_Classes\Local Settings	Browserrefperf.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
1700	schtasks.exe
388	schtasks.exe
4512	schtasks.exe
1552	schtasks.exe
916	schtasks.exe
4180	schtasks.exe

Suspicious behavior: EnumeratesProcesses 2 IoCs

pid	Process
264	Browserrefperf.exe
1124	csrss.exe

Suspicious use of AdjustPrivilegeToken 2 IoCs

description	pid	Process
Token: SeDebugPrivilege	264	Browserrefperf.exe
Token: SeDebugPrivilege	1124	csrss.exe

Suspicious use of WriteProcessMemory 17 IoCs

description	pid	Process	procid_target
PID 4020 wrote to memory of 3936	4020	f9de98bb8b3a6918df525169f13fdb4f2a0389025b2d39c33c129c4c877cc356.exe	81
PID 4020 wrote to memory of 3936	4020	f9de98bb8b3a6918df525169f13fdb4f2a0389025b2d39c33c129c4c877cc356.exe	81
PID 4020 wrote to memory of 3936	4020	f9de98bb8b3a6918df525169f13fdb4f2a0389025b2d39c33c129c4c877cc356.exe	81
PID 4020 wrote to memory of 2132	4020	f9de98bb8b3a6918df525169f13fdb4f2a0389025b2d39c33c129c4c877cc356.exe	82
PID 4020 wrote to memory of 2132	4020	f9de98bb8b3a6918df525169f13fdb4f2a0389025b2d39c33c129c4c877cc356.exe	82
PID 4020 wrote to memory of 2132	4020	f9de98bb8b3a6918df525169f13fdb4f2a0389025b2d39c33c129c4c877cc356.exe	82
PID 3936 wrote to memory of 3940	3936	WScript.exe	84
PID 3936 wrote to memory of 3940	3936	WScript.exe	84
PID 3936 wrote to memory of 3940	3936	WScript.exe	84
PID 3940 wrote to memory of 264	3940	cmd.exe	86
PID 3940 wrote to memory of 264	3940	cmd.exe	86
PID 264 wrote to memory of 3808	264	Browserrefperf.exe	94
PID 264 wrote to memory of 3808	264	Browserrefperf.exe	94
PID 3808 wrote to memory of 1400	3808	cmd.exe	96
PID 3808 wrote to memory of 1400	3808	cmd.exe	96
PID 3808 wrote to memory of 1124	3808	cmd.exe	99
PID 3808 wrote to memory of 1124	3808	cmd.exe	99

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\f9de98bb8b3a6918df525169f13fdb4f2a0389025b2d39c33c129c4c877cc356.exe
"C:\Users\Admin\AppData\Local\Temp\f9de98bb8b3a6918df525169f13fdb4f2a0389025b2d39c33c129c4c877cc356.exe"
1⤵
- Checks computer location settings
- System Location Discovery: System Language Discovery
- Modifies registry class
- Suspicious use of WriteProcessMemory
PID:4020
- C:\Windows\SysWOW64\WScript.exe
  "C:\Windows\System32\WScript.exe" "C:\blockPortWebfonthost\B1fFnqpKl3GGD4HF0Q9OQruQ5J.vbe"
  2⤵
  - Checks computer location settings
  - System Location Discovery: System Language Discovery
  - Suspicious use of WriteProcessMemory
  PID:3936
- - C:\Windows\SysWOW64\cmd.exe
    C:\Windows\system32\cmd.exe /c ""C:\blockPortWebfonthost\oiHeiGZ5nXV56qFTglSJrQC.bat" "
    3⤵
    - System Location Discovery: System Language Discovery
    - Suspicious use of WriteProcessMemory
    PID:3940
  - - C:\blockPortWebfonthost\Browserrefperf.exe
      "C:\blockPortWebfonthost\Browserrefperf.exe"
      4⤵
      Checks computer location settings
      Executes dropped EXE
      Drops file in Program Files directory
      Modifies registry class
      Suspicious behavior: EnumeratesProcesses
      Suspicious use of AdjustPrivilegeToken
      Suspicious use of WriteProcessMemory
      PID:264
    - - C:\Windows\System32\cmd.exe
        
        "C:\Windows\System32\cmd.exe" /C "C:\Users\Admin\AppData\Local\Temp\LMwQffnTI8.bat"
        5⤵
        Suspicious use of WriteProcessMemory
        
        PID:3808
      - C:\Windows\system32\w32tm.exe
        
        w32tm /stripchart /computer:localhost /period:5 /dataonly /samples:2
        6⤵
        
        PID:1400
      - C:\Recovery\WindowsRE\csrss.exe
        
        "C:\Recovery\WindowsRE\csrss.exe"
        6⤵
        Executes dropped EXE
        Suspicious behavior: EnumeratesProcesses
        Suspicious use of AdjustPrivilegeToken
        
        PID:1124
- C:\Windows\SysWOW64\WScript.exe
  "C:\Windows\System32\WScript.exe" "C:\blockPortWebfonthost\file.vbs"
  2⤵
  - System Location Discovery: System Language Discovery
  PID:2132

C:\Windows\system32\schtasks.exe
schtasks.exe /create /tn "csrssc" /sc MINUTE /mo 7 /tr "'C:\Recovery\WindowsRE\csrss.exe'" /f
1⤵
- Process spawned unexpected child process
- Scheduled Task/Job: Scheduled Task
PID:916

C:\Windows\system32\schtasks.exe
schtasks.exe /create /tn "csrss" /sc ONLOGON /tr "'C:\Recovery\WindowsRE\csrss.exe'" /rl HIGHEST /f
1⤵
- Process spawned unexpected child process
- Scheduled Task/Job: Scheduled Task
PID:1552

C:\Windows\system32\schtasks.exe
schtasks.exe /create /tn "csrssc" /sc MINUTE /mo 13 /tr "'C:\Recovery\WindowsRE\csrss.exe'" /rl HIGHEST /f
1⤵
- Process spawned unexpected child process
- Scheduled Task/Job: Scheduled Task
PID:4512

C:\Windows\system32\schtasks.exe
schtasks.exe /create /tn "wininitw" /sc MINUTE /mo 10 /tr "'C:\Program Files\Common Files\microsoft shared\TextConv\en-US\wininit.exe'" /f
1⤵
- Process spawned unexpected child process
- Scheduled Task/Job: Scheduled Task
PID:1700

C:\Windows\system32\schtasks.exe
schtasks.exe /create /tn "wininit" /sc ONLOGON /tr "'C:\Program Files\Common Files\microsoft shared\TextConv\en-US\wininit.exe'" /rl HIGHEST /f
1⤵
- Process spawned unexpected child process
- Scheduled Task/Job: Scheduled Task
PID:4180

C:\Windows\system32\schtasks.exe
schtasks.exe /create /tn "wininitw" /sc MINUTE /mo 6 /tr "'C:\Program Files\Common Files\microsoft shared\TextConv\en-US\wininit.exe'" /rl HIGHEST /f
1⤵
- Process spawned unexpected child process
- Scheduled Task/Job: Scheduled Task
PID:388

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

Replay Monitor

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Downloads

C:\Users\Admin\AppData\Local\Temp\LMwQffnTI8.bat

Filesize
196B

MD5
e744beb8dca5b2f67d084d6239a41116

SHA1
c0bffe5ef46192d325378117a89ea5d3607b9242

SHA256
39b2b28013cfccd50c840f75c46c63e684ec0128629c4ed9d44cec78503e8836

SHA512
614d2f41d0decc4b98c51b3384eb54dbf7bc24ffbbddd2e63cd0626e7c12e2de0948989a5065d4d366df045ab69c2611f917af1c33861693d910c254b61bc25c

Download Submit
C:\blockPortWebfonthost\B1fFnqpKl3GGD4HF0Q9OQruQ5J.vbe

Filesize
220B

MD5
80fc773bb48724fd1484a43ed8d8037c

SHA1
2bf290594881426e0393bdcb0e6826d03ffe2aeb

SHA256
859ceb32c6435a9becc80ded132d3d607c1cec68313b523d5ca36f58936695a6

SHA512
cf468ae1c0c2fd4ddc5c2b5be5428a71895769760b821d77807ca84532468bb1339f57653e7befe1dc1827199b1f4f55d4c78f44ad045bfe5e77ceed1bf997fb

Download Submit
C:\blockPortWebfonthost\Browserrefperf.exe

Filesize
1.7MB

MD5
53bf12b91d006d8e3acaf03f5c6973fe

SHA1
1b15f03372dc2d5d75759c563bf8ed6dc3403251

SHA256
7aed94357ac1cbf630ba47c7b21f8dd1c8f140ae735c8d406cc4b8748a65bc41

SHA512
1cdb00bfbf9b114f69f0aa0d9f1cebc7462f7d616741108d889f09e677d1d4f588a6fc34f75f0026fe0e4de5f80611b42628f9b0f0202cdbf1b3330f8b740bd5

Download Submit
C:\blockPortWebfonthost\file.vbs

Filesize
34B

MD5
677cc4360477c72cb0ce00406a949c61

SHA1
b679e8c3427f6c5fc47c8ac46cd0e56c9424de05

SHA256
f1cccb5ae4aa51d293bd3c7d2a1a04cb7847d22c5db8e05ac64e9a6d7455aa0b

SHA512
7cfe2cc92f9e659f0a15a295624d611b3363bd01eb5bcf9bc7681ea9b70b0564d192d570d294657c8dc2c93497fa3b4526c975a9bf35d69617c31d9936573c6a

Download Submit
C:\blockPortWebfonthost\oiHeiGZ5nXV56qFTglSJrQC.bat

Filesize
44B

MD5
f9d1d98df33c887cf53515e6c3f72252

SHA1
4a13d543fbe8e3fe50ed0468a76186dc2733fcab

SHA256
3dd1df076acd52aa43d18b8c9e93ba9f476d4d837cdbf7bebac2bd3d730aca83

SHA512
91b9537ea1c95156badec09a1688bda4a2ff5770b8f675678906f0834f2754e4ce39fe6f478ab72872359964d1f396fee8473cfcab556d00833be346459fb906

Download Submit
memory/264-19-0x000000001AF00000-0x000000001AF56000-memory.dmp

Filesize
344KB

Download
memory/264-18-0x00000000024B0000-0x00000000024C6000-memory.dmp

Filesize
88KB

Download
memory/264-20-0x00000000024D0000-0x00000000024E2000-memory.dmp

Filesize
72KB

Download
memory/264-21-0x000000001BBE0000-0x000000001C108000-memory.dmp

Filesize
5.2MB

Download
memory/264-25-0x000000001B7C0000-0x000000001B7CC000-memory.dmp

Filesize
48KB

Download
memory/264-24-0x000000001B6B0000-0x000000001B6B8000-memory.dmp

Filesize
32KB

Download
memory/264-23-0x000000001B070000-0x000000001B078000-memory.dmp

Filesize
32KB

Download
memory/264-22-0x000000001AF50000-0x000000001AF5E000-memory.dmp

Filesize
56KB

Download
memory/264-17-0x0000000000220000-0x00000000003D2000-memory.dmp

Filesize
1.7MB

Download
memory/1124-39-0x00000000013F0000-0x0000000001402000-memory.dmp

Filesize
72KB

Download

Analysis

Sharing

General

Malware Config

Signatures

Processes

Network

MITRE ATT&CK Enterprise v15

Replay Monitor

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Downloads