dcrat | f395305daac1c6e8fd577b85bc9132b5358c9e4c4b818b61f76d50d2477a3906

General

Target

DCRatBuild.exe
Size

1.1MB
MD5

a92e55e04cc2026f53c97bdf0e91f6ba
SHA1

a31af958d3f885e0f55465acc214bdb0d56e672f
SHA256

f395305daac1c6e8fd577b85bc9132b5358c9e4c4b818b61f76d50d2477a3906
SHA512

441ca291ccc66f16b5252d65c23fb9f0a57f242ca35f196f41175e2c4d3adc436b026111b79fb4c77db9dbe6370e837133c1d02e571730831293e0a1ffeb95a9
SSDEEP

24576:U2G/nvxW3Ww0t43eblFYt2e9esxtDyVjD7D1NauFd3YP+ow7d:UbA3042rejxtDydhcQ

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 12 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	2788	2176	schtasks.exe	34
Parent C:\Windows\system32\wbem\wmiprvse.exe is not expected to spawn this process	2952	2176	schtasks.exe	34
Parent C:\Windows\system32\wbem\wmiprvse.exe is not expected to spawn this process	2748	2176	schtasks.exe	34
Parent C:\Windows\system32\wbem\wmiprvse.exe is not expected to spawn this process	2616	2176	schtasks.exe	34
Parent C:\Windows\system32\wbem\wmiprvse.exe is not expected to spawn this process	2644	2176	schtasks.exe	34
Parent C:\Windows\system32\wbem\wmiprvse.exe is not expected to spawn this process	1732	2176	schtasks.exe	34
Parent C:\Windows\system32\wbem\wmiprvse.exe is not expected to spawn this process	2448	2176	schtasks.exe	34
Parent C:\Windows\system32\wbem\wmiprvse.exe is not expected to spawn this process	3068	2176	schtasks.exe	34
Parent C:\Windows\system32\wbem\wmiprvse.exe is not expected to spawn this process	556	2176	schtasks.exe	34
Parent C:\Windows\system32\wbem\wmiprvse.exe is not expected to spawn this process	672	2176	schtasks.exe	34
Parent C:\Windows\system32\wbem\wmiprvse.exe is not expected to spawn this process	1812	2176	schtasks.exe	34
Parent C:\Windows\system32\wbem\wmiprvse.exe is not expected to spawn this process	1572	2176	schtasks.exe	34

DCRat payload 3 IoCs

Detects payload of DCRat, commonly dropped by NSIS installers.

rat

resource	yara_rule
behavioral1/files/0x0007000000016ca5-9.dat	dcrat
behavioral1/memory/2896-13-0x0000000000C20000-0x0000000000CF6000-memory.dmp	dcrat
behavioral1/memory/2860-28-0x0000000000E70000-0x0000000000F46000-memory.dmp	dcrat

Executes dropped EXE 2 IoCs

pid	Process
2896	portperf.exe
2860	csrss.exe

Loads dropped DLL 2 IoCs

pid	Process
2260	cmd.exe
2260	cmd.exe

Looks up external IP address via web service 2 IoCs

Uses a legitimate IP lookup service to find the infected system's external IP.

flow	ioc
6	ipinfo.io
7	ipinfo.io

Drops file in Program Files directory 2 IoCs

description	ioc	Process
File created	C:\Program Files\Windows Photo Viewer\it-IT\csrss.exe	portperf.exe
File created	C:\Program Files\Windows Photo Viewer\it-IT\886983d96e3d3e	portperf.exe

Drops file in Windows directory 3 IoCs

description	ioc	Process
File created	C:\Windows\AppPatch\AppPatch64\lsass.exe	portperf.exe
File opened for modification	C:\Windows\AppPatch\AppPatch64\lsass.exe	portperf.exe
File created	C:\Windows\AppPatch\AppPatch64\6203df4a6bafc7	portperf.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	DCRatBuild.exe
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	WScript.exe
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	cmd.exe

Modifies system certificate store 2 TTPs 2 IoCs

evasion spyware trojan

Install Root Certificate

T1553.004

Modify Registry

T1112

description	ioc	Process
Key created	\REGISTRY\MACHINE\SOFTWARE\Microsoft\SystemCertificates\ROOT\Certificates\CABD2A79A1076A31F21D253635CB039D4329A5E8	csrss.exe
Set value (data)	\REGISTRY\MACHINE\SOFTWARE\Microsoft\SystemCertificates\ROOT\Certificates\CABD2A79A1076A31F21D253635CB039D4329A5E8\Blob = 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	csrss.exe

Scheduled Task/Job: Scheduled Task 1 TTPs 12 IoCs

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

persistence execution

Scheduled Task

T1053.005

pid	Process
2952	schtasks.exe
2748	schtasks.exe
2644	schtasks.exe
1732	schtasks.exe
3068	schtasks.exe
672	schtasks.exe
1572	schtasks.exe
2788	schtasks.exe
2448	schtasks.exe
556	schtasks.exe
1812	schtasks.exe
2616	schtasks.exe

Suspicious behavior: EnumeratesProcesses 10 IoCs

pid	Process
2896	portperf.exe
2860	csrss.exe
2860	csrss.exe
2860	csrss.exe
2860	csrss.exe
2860	csrss.exe
2860	csrss.exe
2860	csrss.exe
2860	csrss.exe
2860	csrss.exe

Suspicious behavior: GetForegroundWindowSpam 1 IoCs

pid	Process
2860	csrss.exe

Suspicious use of AdjustPrivilegeToken 2 IoCs

description	pid	Process
Token: SeDebugPrivilege	2896	portperf.exe
Token: SeDebugPrivilege	2860	csrss.exe

Suspicious use of WriteProcessMemory 15 IoCs

description	pid	Process	procid_target
PID 2972 wrote to memory of 1028	2972	DCRatBuild.exe	30
PID 2972 wrote to memory of 1028	2972	DCRatBuild.exe	30
PID 2972 wrote to memory of 1028	2972	DCRatBuild.exe	30
PID 2972 wrote to memory of 1028	2972	DCRatBuild.exe	30
PID 1028 wrote to memory of 2260	1028	WScript.exe	31
PID 1028 wrote to memory of 2260	1028	WScript.exe	31
PID 1028 wrote to memory of 2260	1028	WScript.exe	31
PID 1028 wrote to memory of 2260	1028	WScript.exe	31
PID 2260 wrote to memory of 2896	2260	cmd.exe	33
PID 2260 wrote to memory of 2896	2260	cmd.exe	33
PID 2260 wrote to memory of 2896	2260	cmd.exe	33
PID 2260 wrote to memory of 2896	2260	cmd.exe	33
PID 2896 wrote to memory of 2860	2896	portperf.exe	47
PID 2896 wrote to memory of 2860	2896	portperf.exe	47
PID 2896 wrote to memory of 2860	2896	portperf.exe	47

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\DCRatBuild.exe
"C:\Users\Admin\AppData\Local\Temp\DCRatBuild.exe"
1⤵
- System Location Discovery: System Language Discovery
- Suspicious use of WriteProcessMemory
PID:2972
- C:\Windows\SysWOW64\WScript.exe
  "C:\Windows\System32\WScript.exe" "C:\ChainBlocksurrogateagentFont\IQYI1ZQqki4.vbe"
  2⤵
  - System Location Discovery: System Language Discovery
  - Suspicious use of WriteProcessMemory
  PID:1028
- - C:\Windows\SysWOW64\cmd.exe
    cmd /c ""C:\ChainBlocksurrogateagentFont\qVwtNBtq7doCC7qZCII8cJUJd.bat" "
    3⤵
    - Loads dropped DLL
    - System Location Discovery: System Language Discovery
    - Suspicious use of WriteProcessMemory
    PID:2260
  - - C:\ChainBlocksurrogateagentFont\portperf.exe
      "C:\ChainBlocksurrogateagentFont\portperf.exe"
      4⤵
      Executes dropped EXE
      Drops file in Program Files directory
      Drops file in Windows directory
      Suspicious behavior: EnumeratesProcesses
      Suspicious use of AdjustPrivilegeToken
      Suspicious use of WriteProcessMemory
      PID:2896
    - - C:\Program Files\Windows Photo Viewer\it-IT\csrss.exe
        
        "C:\Program Files\Windows Photo Viewer\it-IT\csrss.exe"
        5⤵
        Executes dropped EXE
        Modifies system certificate store
        Suspicious behavior: EnumeratesProcesses
        Suspicious behavior: GetForegroundWindowSpam
        Suspicious use of AdjustPrivilegeToken
        
        PID:2860

C:\Windows\system32\schtasks.exe
schtasks.exe /create /tn "lsassl" /sc MINUTE /mo 14 /tr "'C:\Windows\AppPatch\AppPatch64\lsass.exe'" /f
1⤵
- Process spawned unexpected child process
- Scheduled Task/Job: Scheduled Task
PID:2788

C:\Windows\system32\schtasks.exe
schtasks.exe /create /tn "lsass" /sc ONLOGON /tr "'C:\Windows\AppPatch\AppPatch64\lsass.exe'" /rl HIGHEST /f
1⤵
- Process spawned unexpected child process
- Scheduled Task/Job: Scheduled Task
PID:2952

C:\Windows\system32\schtasks.exe
schtasks.exe /create /tn "lsassl" /sc MINUTE /mo 8 /tr "'C:\Windows\AppPatch\AppPatch64\lsass.exe'" /rl HIGHEST /f
1⤵
- Process spawned unexpected child process
- Scheduled Task/Job: Scheduled Task
PID:2748

C:\Windows\system32\schtasks.exe
schtasks.exe /create /tn "wininitw" /sc MINUTE /mo 5 /tr "'C:\Users\Default User\wininit.exe'" /f
1⤵
- Process spawned unexpected child process
- Scheduled Task/Job: Scheduled Task
PID:2616

C:\Windows\system32\schtasks.exe
schtasks.exe /create /tn "wininit" /sc ONLOGON /tr "'C:\Users\Default User\wininit.exe'" /rl HIGHEST /f
1⤵
- Process spawned unexpected child process
- Scheduled Task/Job: Scheduled Task
PID:2644

C:\Windows\system32\schtasks.exe
schtasks.exe /create /tn "wininitw" /sc MINUTE /mo 7 /tr "'C:\Users\Default User\wininit.exe'" /rl HIGHEST /f
1⤵
- Process spawned unexpected child process
- Scheduled Task/Job: Scheduled Task
PID:1732

C:\Windows\system32\schtasks.exe
schtasks.exe /create /tn "csrssc" /sc MINUTE /mo 6 /tr "'C:\Program Files\Windows Photo Viewer\it-IT\csrss.exe'" /f
1⤵
- Process spawned unexpected child process
- Scheduled Task/Job: Scheduled Task
PID:2448

C:\Windows\system32\schtasks.exe
schtasks.exe /create /tn "csrss" /sc ONLOGON /tr "'C:\Program Files\Windows Photo Viewer\it-IT\csrss.exe'" /rl HIGHEST /f
1⤵
- Process spawned unexpected child process
- Scheduled Task/Job: Scheduled Task
PID:3068

C:\Windows\system32\schtasks.exe
schtasks.exe /create /tn "csrssc" /sc MINUTE /mo 7 /tr "'C:\Program Files\Windows Photo Viewer\it-IT\csrss.exe'" /rl HIGHEST /f
1⤵
- Process spawned unexpected child process
- Scheduled Task/Job: Scheduled Task
PID:556

C:\Windows\system32\schtasks.exe
schtasks.exe /create /tn "csrssc" /sc MINUTE /mo 10 /tr "'C:\ChainBlocksurrogateagentFont\csrss.exe'" /f
1⤵
- Process spawned unexpected child process
- Scheduled Task/Job: Scheduled Task
PID:672

C:\Windows\system32\schtasks.exe
schtasks.exe /create /tn "csrss" /sc ONLOGON /tr "'C:\ChainBlocksurrogateagentFont\csrss.exe'" /rl HIGHEST /f
1⤵
- Process spawned unexpected child process
- Scheduled Task/Job: Scheduled Task
PID:1812

C:\Windows\system32\schtasks.exe
schtasks.exe /create /tn "csrssc" /sc MINUTE /mo 13 /tr "'C:\ChainBlocksurrogateagentFont\csrss.exe'" /rl HIGHEST /f
1⤵
- Process spawned unexpected child process
- Scheduled Task/Job: Scheduled Task
PID:1572

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

Modify Registry

1

T1112

Subvert Trust Controls

1

T1553

Install Root Certificate

1

T1553.004

Credential Access

Discovery

Query Registry

1

T1012

System Information Discovery

1

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:\ChainBlocksurrogateagentFont\IQYI1ZQqki4.vbe

Filesize
230B

MD5
b3e0630669e9f81b3e57048e6af1e015

SHA1
650473dc5a9144a544fb53af84ef4fc8e0a72320

SHA256
01543751a00db2bbbaaf366aa712303363c484c1f9970ae04857f6703473a5e2

SHA512
ac7e7fdf1fb92273a08e030d9f4b407faa4b759c85932a7a2463df92f83f5bb7b596b9d8b2e0acea1a20305903f4e425e7a82edf4f12c9ca60c56f67bca1236f

Download Submit
C:\ChainBlocksurrogateagentFont\qVwtNBtq7doCC7qZCII8cJUJd.bat

Filesize
46B

MD5
00afe3a3fcc7952dfadc97502a3aecac

SHA1
6b7e7835cd437e437c91ad91255efe5c8f24c0f4

SHA256
5f60a9046ff7978e0518ad160509409a8818dbea53faa79c5d93364dd8d70f95

SHA512
9af6ecb3ff68382c633e640d29e86d17597faa2ab712f75697bdf98596c6b17146991ec88fd94df8c65a8fa6ae60e763a66747cf0be4ae37d60beb1e8ff87cc3

Download Submit
\ChainBlocksurrogateagentFont\portperf.exe

Filesize
829KB

MD5
a054982f7e12c1f491eccd25d9c1b5d7

SHA1
b3c78b1c7c8a95486db06e39f56910d0f3e90996

SHA256
4b6302643800dafe4629960e243ba26663f8510c42f4eaf656b1cc510406e408

SHA512
d57be5af22f21e7c20d330f5714ddcf1936152e3d9bd2254c1a2c83f420bfe183ae204c871b1ce2d8f5361a1661afbe39a9b5bec12fb00195a8c0b967977a925

Download Submit
memory/2860-28-0x0000000000E70000-0x0000000000F46000-memory.dmp

Filesize
856KB

Download
memory/2896-13-0x0000000000C20000-0x0000000000CF6000-memory.dmp

Filesize
856KB

Download

Analysis

Sharing

General

Malware Config

Signatures

Processes

Network

MITRE ATT&CK Enterprise v15

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Downloads