dcrat | bc3f7e752971227983d7c0eec18816ae2dbdd4444ddc26dec020159f11ff640f

General

Target

bc3f7e752971227983d7c0eec18816ae2dbdd4444ddc26dec020159f11ff640f.exe
Size

828KB
MD5

2f9ff2f250a639e72310b4ebc02054d7
SHA1

ddaa6f6ce1729f7cb390e89a91c200dc11aec4d0
SHA256

bc3f7e752971227983d7c0eec18816ae2dbdd4444ddc26dec020159f11ff640f
SHA512

7920a80dead2c84e7348813eb344bba991634a71c9f4d1089e555d4f02173bb96529bac8365319da821ed473ca5fb5733a19be756951077e7af5c782f4b41256
SSDEEP

12288:TviNmUgaxKEQo+Hg5GHYv63A26CLjNh6lSS3zRNJm8nZfN:Tv+DrsEQxgIHYv6wfah6lJjRuan

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

Process spawned unexpected child process 24 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	3928	2076	schtasks.exe	83
Parent C:\Windows\system32\wbem\wmiprvse.exe is not expected to spawn this process	4512	2076	schtasks.exe	83
Parent C:\Windows\system32\wbem\wmiprvse.exe is not expected to spawn this process	4764	2076	schtasks.exe	83
Parent C:\Windows\system32\wbem\wmiprvse.exe is not expected to spawn this process	4868	2076	schtasks.exe	83
Parent C:\Windows\system32\wbem\wmiprvse.exe is not expected to spawn this process	412	2076	schtasks.exe	83
Parent C:\Windows\system32\wbem\wmiprvse.exe is not expected to spawn this process	2724	2076	schtasks.exe	83
Parent C:\Windows\system32\wbem\wmiprvse.exe is not expected to spawn this process	544	2076	schtasks.exe	83
Parent C:\Windows\system32\wbem\wmiprvse.exe is not expected to spawn this process	2156	2076	schtasks.exe	83
Parent C:\Windows\system32\wbem\wmiprvse.exe is not expected to spawn this process	2264	2076	schtasks.exe	83
Parent C:\Windows\system32\wbem\wmiprvse.exe is not expected to spawn this process	3812	2076	schtasks.exe	83
Parent C:\Windows\system32\wbem\wmiprvse.exe is not expected to spawn this process	4312	2076	schtasks.exe	83
Parent C:\Windows\system32\wbem\wmiprvse.exe is not expected to spawn this process	4588	2076	schtasks.exe	83
Parent C:\Windows\system32\wbem\wmiprvse.exe is not expected to spawn this process	2328	2076	schtasks.exe	83
Parent C:\Windows\system32\wbem\wmiprvse.exe is not expected to spawn this process	3900	2076	schtasks.exe	83
Parent C:\Windows\system32\wbem\wmiprvse.exe is not expected to spawn this process	3840	2076	schtasks.exe	83
Parent C:\Windows\system32\wbem\wmiprvse.exe is not expected to spawn this process	1328	2076	schtasks.exe	83
Parent C:\Windows\system32\wbem\wmiprvse.exe is not expected to spawn this process	3548	2076	schtasks.exe	83
Parent C:\Windows\system32\wbem\wmiprvse.exe is not expected to spawn this process	680	2076	schtasks.exe	83
Parent C:\Windows\system32\wbem\wmiprvse.exe is not expected to spawn this process	4788	2076	schtasks.exe	83
Parent C:\Windows\system32\wbem\wmiprvse.exe is not expected to spawn this process	4832	2076	schtasks.exe	83
Parent C:\Windows\system32\wbem\wmiprvse.exe is not expected to spawn this process	3304	2076	schtasks.exe	83
Parent C:\Windows\system32\wbem\wmiprvse.exe is not expected to spawn this process	5068	2076	schtasks.exe	83
Parent C:\Windows\system32\wbem\wmiprvse.exe is not expected to spawn this process	4636	2076	schtasks.exe	83
Parent C:\Windows\system32\wbem\wmiprvse.exe is not expected to spawn this process	3996	2076	schtasks.exe	83

DCRat payload 2 IoCs

Detects payload of DCRat, commonly dropped by NSIS installers.

rat

resource	yara_rule
behavioral2/memory/220-1-0x0000000000050000-0x0000000000126000-memory.dmp	dcrat
behavioral2/files/0x000a000000023b93-11.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-1-5-21-493223053-2004649691-1575712786-1000\Control Panel\International\Geo\Nation	bc3f7e752971227983d7c0eec18816ae2dbdd4444ddc26dec020159f11ff640f.exe

Executes dropped EXE 1 IoCs

pid	Process
4648	dllhost.exe

Drops file in Program Files directory 9 IoCs

description	ioc	Process
File opened for modification	C:\Program Files (x86)\Windows Portable Devices\winlogon.exe	bc3f7e752971227983d7c0eec18816ae2dbdd4444ddc26dec020159f11ff640f.exe
File created	C:\Program Files\MSBuild\Microsoft\Windows Workflow Foundation\v3.0\upfc.exe	bc3f7e752971227983d7c0eec18816ae2dbdd4444ddc26dec020159f11ff640f.exe
File created	C:\Program Files\MSBuild\Microsoft\Windows Workflow Foundation\v3.0\ea1d8f6d871115	bc3f7e752971227983d7c0eec18816ae2dbdd4444ddc26dec020159f11ff640f.exe
File created	C:\Program Files\Windows Media Player\ja-JP\Idle.exe	bc3f7e752971227983d7c0eec18816ae2dbdd4444ddc26dec020159f11ff640f.exe
File created	C:\Program Files\Windows Media Player\ja-JP\6ccacd8608530f	bc3f7e752971227983d7c0eec18816ae2dbdd4444ddc26dec020159f11ff640f.exe
File created	C:\Program Files (x86)\Windows Portable Devices\winlogon.exe	bc3f7e752971227983d7c0eec18816ae2dbdd4444ddc26dec020159f11ff640f.exe
File created	C:\Program Files\Windows Media Player\Network Sharing\smss.exe	bc3f7e752971227983d7c0eec18816ae2dbdd4444ddc26dec020159f11ff640f.exe
File created	C:\Program Files\Windows Media Player\Network Sharing\69ddcba757bf72	bc3f7e752971227983d7c0eec18816ae2dbdd4444ddc26dec020159f11ff640f.exe
File created	C:\Program Files (x86)\Windows Portable Devices\cc11b995f2a76d	bc3f7e752971227983d7c0eec18816ae2dbdd4444ddc26dec020159f11ff640f.exe

Drops file in Windows directory 4 IoCs

description	ioc	Process
File created	C:\Windows\RemotePackages\RemoteDesktops\OfficeClickToRun.exe	bc3f7e752971227983d7c0eec18816ae2dbdd4444ddc26dec020159f11ff640f.exe
File created	C:\Windows\RemotePackages\RemoteDesktops\e6c9b481da804f	bc3f7e752971227983d7c0eec18816ae2dbdd4444ddc26dec020159f11ff640f.exe
File created	C:\Windows\PolicyDefinitions\SearchApp.exe	bc3f7e752971227983d7c0eec18816ae2dbdd4444ddc26dec020159f11ff640f.exe
File created	C:\Windows\PolicyDefinitions\38384e6a620884	bc3f7e752971227983d7c0eec18816ae2dbdd4444ddc26dec020159f11ff640f.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-1-5-21-493223053-2004649691-1575712786-1000_Classes\Local Settings	bc3f7e752971227983d7c0eec18816ae2dbdd4444ddc26dec020159f11ff640f.exe

Scheduled Task/Job: Scheduled Task 1 TTPs 24 IoCs

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

persistence execution

Scheduled Task

T1053.005

pid	Process
4312	schtasks.exe
3548	schtasks.exe
680	schtasks.exe
3996	schtasks.exe
3928	schtasks.exe
2156	schtasks.exe
2264	schtasks.exe
3812	schtasks.exe
4588	schtasks.exe
4788	schtasks.exe
4832	schtasks.exe
4512	schtasks.exe
4764	schtasks.exe
4868	schtasks.exe
544	schtasks.exe
1328	schtasks.exe
5068	schtasks.exe
4636	schtasks.exe
3840	schtasks.exe
3304	schtasks.exe
412	schtasks.exe
2724	schtasks.exe
2328	schtasks.exe
3900	schtasks.exe

Suspicious behavior: EnumeratesProcesses 2 IoCs

pid	Process
220	bc3f7e752971227983d7c0eec18816ae2dbdd4444ddc26dec020159f11ff640f.exe
4648	dllhost.exe

Suspicious use of AdjustPrivilegeToken 2 IoCs

description	pid	Process
Token: SeDebugPrivilege	220	bc3f7e752971227983d7c0eec18816ae2dbdd4444ddc26dec020159f11ff640f.exe
Token: SeDebugPrivilege	4648	dllhost.exe

Suspicious use of WriteProcessMemory 6 IoCs

description	pid	Process	procid_target
PID 220 wrote to memory of 800	220	bc3f7e752971227983d7c0eec18816ae2dbdd4444ddc26dec020159f11ff640f.exe	108
PID 220 wrote to memory of 800	220	bc3f7e752971227983d7c0eec18816ae2dbdd4444ddc26dec020159f11ff640f.exe	108
PID 800 wrote to memory of 1560	800	cmd.exe	110
PID 800 wrote to memory of 1560	800	cmd.exe	110
PID 800 wrote to memory of 4648	800	cmd.exe	112
PID 800 wrote to memory of 4648	800	cmd.exe	112

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\bc3f7e752971227983d7c0eec18816ae2dbdd4444ddc26dec020159f11ff640f.exe
"C:\Users\Admin\AppData\Local\Temp\bc3f7e752971227983d7c0eec18816ae2dbdd4444ddc26dec020159f11ff640f.exe"
1⤵
- Checks computer location settings
- 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:220
- C:\Windows\System32\cmd.exe
  "C:\Windows\System32\cmd.exe" /C "C:\Users\Admin\AppData\Local\Temp\jg9U23qGKp.bat"
  2⤵
  - Suspicious use of WriteProcessMemory
  PID:800
- - C:\Windows\system32\w32tm.exe
    w32tm /stripchart /computer:localhost /period:5 /dataonly /samples:2
    3⤵
    PID:1560
- - C:\Users\Default User\dllhost.exe
    "C:\Users\Default User\dllhost.exe"
    3⤵
    - Executes dropped EXE
    - Suspicious behavior: EnumeratesProcesses
    - Suspicious use of AdjustPrivilegeToken
    PID:4648

C:\Windows\system32\schtasks.exe
schtasks.exe /create /tn "winlogonw" /sc MINUTE /mo 13 /tr "'C:\Program Files (x86)\Windows Portable Devices\winlogon.exe'" /f
1⤵
- Process spawned unexpected child process
- Scheduled Task/Job: Scheduled Task
PID:3928

C:\Windows\system32\schtasks.exe
schtasks.exe /create /tn "winlogon" /sc ONLOGON /tr "'C:\Program Files (x86)\Windows Portable Devices\winlogon.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 "winlogonw" /sc MINUTE /mo 7 /tr "'C:\Program Files (x86)\Windows Portable Devices\winlogon.exe'" /rl HIGHEST /f
1⤵
- Process spawned unexpected child process
- Scheduled Task/Job: Scheduled Task
PID:4764

C:\Windows\system32\schtasks.exe
schtasks.exe /create /tn "bc3f7e752971227983d7c0eec18816ae2dbdd4444ddc26dec020159f11ff640fb" /sc MINUTE /mo 13 /tr "'C:\Recovery\WindowsRE\bc3f7e752971227983d7c0eec18816ae2dbdd4444ddc26dec020159f11ff640f.exe'" /f
1⤵
- Process spawned unexpected child process
- Scheduled Task/Job: Scheduled Task
PID:4868

C:\Windows\system32\schtasks.exe
schtasks.exe /create /tn "bc3f7e752971227983d7c0eec18816ae2dbdd4444ddc26dec020159f11ff640f" /sc ONLOGON /tr "'C:\Recovery\WindowsRE\bc3f7e752971227983d7c0eec18816ae2dbdd4444ddc26dec020159f11ff640f.exe'" /rl HIGHEST /f
1⤵
- Process spawned unexpected child process
- Scheduled Task/Job: Scheduled Task
PID:412

C:\Windows\system32\schtasks.exe
schtasks.exe /create /tn "bc3f7e752971227983d7c0eec18816ae2dbdd4444ddc26dec020159f11ff640fb" /sc MINUTE /mo 14 /tr "'C:\Recovery\WindowsRE\bc3f7e752971227983d7c0eec18816ae2dbdd4444ddc26dec020159f11ff640f.exe'" /rl HIGHEST /f
1⤵
- Process spawned unexpected child process
- Scheduled Task/Job: Scheduled Task
PID:2724

C:\Windows\system32\schtasks.exe
schtasks.exe /create /tn "OfficeClickToRunO" /sc MINUTE /mo 12 /tr "'C:\Windows\RemotePackages\RemoteDesktops\OfficeClickToRun.exe'" /f
1⤵
- Process spawned unexpected child process
- Scheduled Task/Job: Scheduled Task
PID:544

C:\Windows\system32\schtasks.exe
schtasks.exe /create /tn "OfficeClickToRun" /sc ONLOGON /tr "'C:\Windows\RemotePackages\RemoteDesktops\OfficeClickToRun.exe'" /rl HIGHEST /f
1⤵
- Process spawned unexpected child process
- Scheduled Task/Job: Scheduled Task
PID:2156

C:\Windows\system32\schtasks.exe
schtasks.exe /create /tn "OfficeClickToRunO" /sc MINUTE /mo 6 /tr "'C:\Windows\RemotePackages\RemoteDesktops\OfficeClickToRun.exe'" /rl HIGHEST /f
1⤵
- Process spawned unexpected child process
- Scheduled Task/Job: Scheduled Task
PID:2264

C:\Windows\system32\schtasks.exe
schtasks.exe /create /tn "dllhostd" /sc MINUTE /mo 8 /tr "'C:\Users\Default User\dllhost.exe'" /f
1⤵
- Process spawned unexpected child process
- Scheduled Task/Job: Scheduled Task
PID:3812

C:\Windows\system32\schtasks.exe
schtasks.exe /create /tn "dllhost" /sc ONLOGON /tr "'C:\Users\Default User\dllhost.exe'" /rl HIGHEST /f
1⤵
- Process spawned unexpected child process
- Scheduled Task/Job: Scheduled Task
PID:4312

C:\Windows\system32\schtasks.exe
schtasks.exe /create /tn "dllhostd" /sc MINUTE /mo 9 /tr "'C:\Users\Default User\dllhost.exe'" /rl HIGHEST /f
1⤵
- Process spawned unexpected child process
- Scheduled Task/Job: Scheduled Task
PID:4588

C:\Windows\system32\schtasks.exe
schtasks.exe /create /tn "upfcu" /sc MINUTE /mo 8 /tr "'C:\Program Files\MSBuild\Microsoft\Windows Workflow Foundation\v3.0\upfc.exe'" /f
1⤵
- Process spawned unexpected child process
- Scheduled Task/Job: Scheduled Task
PID:3900

C:\Windows\system32\schtasks.exe
schtasks.exe /create /tn "upfc" /sc ONLOGON /tr "'C:\Program Files\MSBuild\Microsoft\Windows Workflow Foundation\v3.0\upfc.exe'" /rl HIGHEST /f
1⤵
- Process spawned unexpected child process
- Scheduled Task/Job: Scheduled Task
PID:2328

C:\Windows\system32\schtasks.exe
schtasks.exe /create /tn "upfcu" /sc MINUTE /mo 10 /tr "'C:\Program Files\MSBuild\Microsoft\Windows Workflow Foundation\v3.0\upfc.exe'" /rl HIGHEST /f
1⤵
- Process spawned unexpected child process
- Scheduled Task/Job: Scheduled Task
PID:3840

C:\Windows\system32\schtasks.exe
schtasks.exe /create /tn "IdleI" /sc MINUTE /mo 7 /tr "'C:\Program Files\Windows Media Player\ja-JP\Idle.exe'" /f
1⤵
- Process spawned unexpected child process
- Scheduled Task/Job: Scheduled Task
PID:1328

C:\Windows\system32\schtasks.exe
schtasks.exe /create /tn "Idle" /sc ONLOGON /tr "'C:\Program Files\Windows Media Player\ja-JP\Idle.exe'" /rl HIGHEST /f
1⤵
- Process spawned unexpected child process
- Scheduled Task/Job: Scheduled Task
PID:3548

C:\Windows\system32\schtasks.exe
schtasks.exe /create /tn "IdleI" /sc MINUTE /mo 11 /tr "'C:\Program Files\Windows Media Player\ja-JP\Idle.exe'" /rl HIGHEST /f
1⤵
- Process spawned unexpected child process
- Scheduled Task/Job: Scheduled Task
PID:680

C:\Windows\system32\schtasks.exe
schtasks.exe /create /tn "smsss" /sc MINUTE /mo 13 /tr "'C:\Program Files\Windows Media Player\Network Sharing\smss.exe'" /f
1⤵
- Process spawned unexpected child process
- Scheduled Task/Job: Scheduled Task
PID:4788

C:\Windows\system32\schtasks.exe
schtasks.exe /create /tn "smss" /sc ONLOGON /tr "'C:\Program Files\Windows Media Player\Network Sharing\smss.exe'" /rl HIGHEST /f
1⤵
- Process spawned unexpected child process
- Scheduled Task/Job: Scheduled Task
PID:4832

C:\Windows\system32\schtasks.exe
schtasks.exe /create /tn "smsss" /sc MINUTE /mo 6 /tr "'C:\Program Files\Windows Media Player\Network Sharing\smss.exe'" /rl HIGHEST /f
1⤵
- Process spawned unexpected child process
- Scheduled Task/Job: Scheduled Task
PID:3304

C:\Windows\system32\schtasks.exe
schtasks.exe /create /tn "SearchAppS" /sc MINUTE /mo 14 /tr "'C:\Windows\PolicyDefinitions\SearchApp.exe'" /f
1⤵
- Process spawned unexpected child process
- Scheduled Task/Job: Scheduled Task
PID:5068

C:\Windows\system32\schtasks.exe
schtasks.exe /create /tn "SearchApp" /sc ONLOGON /tr "'C:\Windows\PolicyDefinitions\SearchApp.exe'" /rl HIGHEST /f
1⤵
- Process spawned unexpected child process
- Scheduled Task/Job: Scheduled Task
PID:4636

C:\Windows\system32\schtasks.exe
schtasks.exe /create /tn "SearchAppS" /sc MINUTE /mo 7 /tr "'C:\Windows\PolicyDefinitions\SearchApp.exe'" /rl HIGHEST /f
1⤵
- Process spawned unexpected child process
- Scheduled Task/Job: Scheduled Task
PID:3996

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:\Program Files\MSBuild\Microsoft\Windows Workflow Foundation\v3.0\upfc.exe

Filesize
828KB

MD5
2f9ff2f250a639e72310b4ebc02054d7

SHA1
ddaa6f6ce1729f7cb390e89a91c200dc11aec4d0

SHA256
bc3f7e752971227983d7c0eec18816ae2dbdd4444ddc26dec020159f11ff640f

SHA512
7920a80dead2c84e7348813eb344bba991634a71c9f4d1089e555d4f02173bb96529bac8365319da821ed473ca5fb5733a19be756951077e7af5c782f4b41256

Download Submit
C:\Users\Admin\AppData\Local\Temp\jg9U23qGKp.bat

Filesize
198B

MD5
4cd7e18f50581b9c34bea495ccf14408

SHA1
40a3ad9e444cdaae857986151341fb5ba9856ace

SHA256
5c6a2caab02bf4952ce5fb92c9ad5bfb774bccdb0f6740c10aadec81ea270a3a

SHA512
5137b571e20dcd18647377200a0e062542736aa3c1d5721efc9a69d092af228c9a2703c70938c9d6e5a5bfd96dfad41922ec4a6d3e4b76eafb204e3b43b1e57a

Download Submit
memory/220-0-0x00007FFDC4013000-0x00007FFDC4015000-memory.dmp

Filesize
8KB

Download
memory/220-1-0x0000000000050000-0x0000000000126000-memory.dmp

Filesize
856KB

Download
memory/220-4-0x00007FFDC4010000-0x00007FFDC4AD1000-memory.dmp

Filesize
10.8MB

Download
memory/220-24-0x00007FFDC4010000-0x00007FFDC4AD1000-memory.dmp

Filesize
10.8MB

Download

Analysis

Sharing

General

Malware Config

Signatures

Processes

Network

MITRE ATT&CK Enterprise v15

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Downloads