dcrat | 122f5fbdf16a82a90c358ec2e39933e8a5ef43d76cb4fd63ae68863023ecfa01

General

Target

27e28c0509f0685673ae9435e44f163f.exe
Size

929KB
MD5

27e28c0509f0685673ae9435e44f163f
SHA1

384c365e6ceff71f94038c19d6dd72451b128576
SHA256

122f5fbdf16a82a90c358ec2e39933e8a5ef43d76cb4fd63ae68863023ecfa01
SHA512

1cbd42612aee9f5cffb6a55155f397cb657d807955d26fec742041649c359b9c48acf128f0c7e4a866497854153f333e75d3bf613a6f52d7f0836ddbb295cb20
SSDEEP

12288:jpLIRXM1We9wDdtSF4j7nvLaMfUyciwQUXUtqRrjK2QSaDcy11wZPiAQqn4:CtUkqRrQH3wZW+4

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

Process spawned unexpected child process 8 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	1424	2168	schtasks.exe	87
Parent C:\Windows\system32\wbem\wmiprvse.exe is not expected to spawn this process	4392	2168	schtasks.exe	87
Parent C:\Windows\system32\wbem\wmiprvse.exe is not expected to spawn this process	3092	2168	schtasks.exe	87
Parent C:\Windows\system32\wbem\wmiprvse.exe is not expected to spawn this process	1808	2168	schtasks.exe	87
Parent C:\Windows\system32\wbem\wmiprvse.exe is not expected to spawn this process	3276	2168	schtasks.exe	87
Parent C:\Windows\system32\wbem\wmiprvse.exe is not expected to spawn this process	2032	2168	schtasks.exe	87
Parent C:\Windows\system32\wbem\wmiprvse.exe is not expected to spawn this process	1932	2168	schtasks.exe	87
Parent C:\Windows\system32\wbem\wmiprvse.exe is not expected to spawn this process	4872	2168	schtasks.exe	87

DCRat payload 4 IoCs

Detects payload of DCRat, commonly dropped by NSIS installers.

rat

resource	yara_rule
behavioral2/memory/2980-133-0x0000000000C30000-0x0000000000D20000-memory.dmp	dcrat
behavioral2/files/0x00060000000231df-144.dat	dcrat
behavioral2/files/0x00060000000231df-160.dat	dcrat
behavioral2/files/0x00060000000231df-161.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-1-5-21-618519468-4027732583-1827558364-1000\Control Panel\International\Geo\Nation	27e28c0509f0685673ae9435e44f163f.exe

Executes dropped EXE 1 IoCs

pid	Process
4340	OfficeClickToRun.exe

Adds Run key to start application 2 TTPs 8 IoCs

persistence

Registry Run Keys / Startup Folder

T1060

Modify Registry

T1112

description	ioc	Process
Set value (str)	\REGISTRY\MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Run\27e28c0509f0685673ae9435e44f163f = "\"C:\\Program Files\\Internet Explorer\\es-ES\\27e28c0509f0685673ae9435e44f163f.exe\""	27e28c0509f0685673ae9435e44f163f.exe
Set value (str)	\REGISTRY\MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Run\backgroundTaskHost = "\"C:\\Windows\\System32\\makecab\\backgroundTaskHost.exe\""	27e28c0509f0685673ae9435e44f163f.exe
Set value (str)	\REGISTRY\MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Run\27e28c0509f0685673ae9435e44f163f = "\"C:\\Users\\Admin\\AppData\\Local\\Temp\\aria-debug-1012\\27e28c0509f0685673ae9435e44f163f.exe\""	27e28c0509f0685673ae9435e44f163f.exe
Set value (str)	\REGISTRY\MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Run\OfficeClickToRun = "\"C:\\ProgramData\\SoftwareDistribution\\OfficeClickToRun.exe\""	27e28c0509f0685673ae9435e44f163f.exe
Set value (str)	\REGISTRY\MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Run\fontdrvhost = "\"C:\\odt\\fontdrvhost.exe\""	27e28c0509f0685673ae9435e44f163f.exe
Set value (str)	\REGISTRY\MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Run\SearchApp = "\"C:\\PerfLogs\\SearchApp.exe\""	27e28c0509f0685673ae9435e44f163f.exe
Set value (str)	\REGISTRY\MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Run\fontdrvhost = "\"C:\\Recovery\\WindowsRE\\fontdrvhost.exe\""	27e28c0509f0685673ae9435e44f163f.exe
Set value (str)	\REGISTRY\MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Run\backgroundTaskHost = "\"C:\\Windows\\System32\\DataStoreCacheDumpTool\\backgroundTaskHost.exe\""	27e28c0509f0685673ae9435e44f163f.exe

Drops file in System32 directory 5 IoCs

description	ioc	Process
File opened for modification	C:\Windows\System32\DataStoreCacheDumpTool\backgroundTaskHost.exe	27e28c0509f0685673ae9435e44f163f.exe
File created	C:\Windows\System32\DataStoreCacheDumpTool\eddb19405b7ce1152b3e19997f2b467f0b72b3d3	27e28c0509f0685673ae9435e44f163f.exe
File created	C:\Windows\System32\makecab\backgroundTaskHost.exe	27e28c0509f0685673ae9435e44f163f.exe
File created	C:\Windows\System32\makecab\eddb19405b7ce1152b3e19997f2b467f0b72b3d3	27e28c0509f0685673ae9435e44f163f.exe
File created	C:\Windows\System32\DataStoreCacheDumpTool\backgroundTaskHost.exe	27e28c0509f0685673ae9435e44f163f.exe

Drops file in Program Files directory 2 IoCs

description	ioc	Process
File created	C:\Program Files\Internet Explorer\es-ES\27e28c0509f0685673ae9435e44f163f.exe	27e28c0509f0685673ae9435e44f163f.exe
File created	C:\Program Files\Internet Explorer\es-ES\0c255cb2679e66d5d576203a6bc85371d484496e	27e28c0509f0685673ae9435e44f163f.exe

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

System Information Discovery
T1082

Creates scheduled task(s) 1 TTPs 8 IoCs

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

persistence

Scheduled Task

T1053

pid	Process
1932	schtasks.exe
4872	schtasks.exe
1424	schtasks.exe
4392	schtasks.exe
3092	schtasks.exe
1808	schtasks.exe
3276	schtasks.exe
2032	schtasks.exe

Modifies registry class 1 IoCs

description	ioc	Process
Key created	\REGISTRY\USER\S-1-5-21-618519468-4027732583-1827558364-1000_Classes\Local Settings	27e28c0509f0685673ae9435e44f163f.exe

Suspicious behavior: EnumeratesProcesses 5 IoCs

pid	Process
2980	27e28c0509f0685673ae9435e44f163f.exe
2980	27e28c0509f0685673ae9435e44f163f.exe
2980	27e28c0509f0685673ae9435e44f163f.exe
2980	27e28c0509f0685673ae9435e44f163f.exe
2980	27e28c0509f0685673ae9435e44f163f.exe

Suspicious use of AdjustPrivilegeToken 2 IoCs

description	pid	Process
Token: SeDebugPrivilege	2980	27e28c0509f0685673ae9435e44f163f.exe
Token: SeDebugPrivilege	4340	OfficeClickToRun.exe

Suspicious use of WriteProcessMemory 6 IoCs

description	pid	Process	procid_target
PID 2980 wrote to memory of 968	2980	27e28c0509f0685673ae9435e44f163f.exe	97
PID 2980 wrote to memory of 968	2980	27e28c0509f0685673ae9435e44f163f.exe	97
PID 968 wrote to memory of 4428	968	cmd.exe	99
PID 968 wrote to memory of 4428	968	cmd.exe	99
PID 968 wrote to memory of 4340	968	cmd.exe	105
PID 968 wrote to memory of 4340	968	cmd.exe	105

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\27e28c0509f0685673ae9435e44f163f.exe
"C:\Users\Admin\AppData\Local\Temp\27e28c0509f0685673ae9435e44f163f.exe"
1⤵
- Checks computer location settings
- Adds Run key to start application
- Drops file in System32 directory
- Drops file in Program Files directory
- Modifies registry class
- Suspicious behavior: EnumeratesProcesses
- Suspicious use of AdjustPrivilegeToken
- Suspicious use of WriteProcessMemory
PID:2980
- C:\Windows\System32\cmd.exe
  "C:\Windows\System32\cmd.exe" /C "C:\Users\Admin\AppData\Local\Temp\5znRFlY8cB.bat"
  2⤵
  - Suspicious use of WriteProcessMemory
  PID:968
- - C:\Windows\system32\w32tm.exe
    w32tm /stripchart /computer:localhost /period:5 /dataonly /samples:2
    3⤵
    PID:4428
- - C:\ProgramData\SoftwareDistribution\OfficeClickToRun.exe
    "C:\ProgramData\SoftwareDistribution\OfficeClickToRun.exe"
    3⤵
    - Executes dropped EXE
    - Suspicious use of AdjustPrivilegeToken
    PID:4340

C:\Windows\system32\schtasks.exe
schtasks.exe /create /tn "backgroundTaskHost" /sc ONLOGON /tr "'C:\Windows\System32\DataStoreCacheDumpTool\backgroundTaskHost.exe'" /rl HIGHEST /f
1⤵
- Process spawned unexpected child process
- Creates scheduled task(s)
PID:1424

C:\Windows\system32\schtasks.exe
schtasks.exe /create /tn "27e28c0509f0685673ae9435e44f163f" /sc ONLOGON /tr "'C:\Program Files\Internet Explorer\es-ES\27e28c0509f0685673ae9435e44f163f.exe'" /rl HIGHEST /f
1⤵
- Process spawned unexpected child process
- Creates scheduled task(s)
PID:4392

C:\Windows\system32\schtasks.exe
schtasks.exe /create /tn "backgroundTaskHost" /sc ONLOGON /tr "'C:\Windows\System32\makecab\backgroundTaskHost.exe'" /rl HIGHEST /f
1⤵
- Process spawned unexpected child process
- Creates scheduled task(s)
PID:3092

C:\Windows\system32\schtasks.exe
schtasks.exe /create /tn "27e28c0509f0685673ae9435e44f163f" /sc ONLOGON /tr "'C:\Users\Admin\AppData\Local\Temp\aria-debug-1012\27e28c0509f0685673ae9435e44f163f.exe'" /rl HIGHEST /f
1⤵
- Process spawned unexpected child process
- Creates scheduled task(s)
PID:1808

C:\Windows\system32\schtasks.exe
schtasks.exe /create /tn "OfficeClickToRun" /sc ONLOGON /tr "'C:\ProgramData\SoftwareDistribution\OfficeClickToRun.exe'" /rl HIGHEST /f
1⤵
- Process spawned unexpected child process
- Creates scheduled task(s)
PID:3276

C:\Windows\system32\schtasks.exe
schtasks.exe /create /tn "fontdrvhost" /sc ONLOGON /tr "'C:\odt\fontdrvhost.exe'" /rl HIGHEST /f
1⤵
- Process spawned unexpected child process
- Creates scheduled task(s)
PID:2032

C:\Windows\system32\schtasks.exe
schtasks.exe /create /tn "SearchApp" /sc ONLOGON /tr "'C:\PerfLogs\SearchApp.exe'" /rl HIGHEST /f
1⤵
- Process spawned unexpected child process
- Creates scheduled task(s)
PID:1932

C:\Windows\system32\schtasks.exe
schtasks.exe /create /tn "fontdrvhost" /sc ONLOGON /tr "'C:\Recovery\WindowsRE\fontdrvhost.exe'" /rl HIGHEST /f
1⤵
- Process spawned unexpected child process
- Creates scheduled task(s)
PID:4872

Network

MITRE ATT&CK Enterprise v6

Initial Access

Execution

Scheduled Task

1

T1053

Persistence

Registry Run Keys / Startup Folder

Scheduled Task

Privilege Escalation

Scheduled Task

1

T1053

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

Replay Monitor

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Downloads

C:\ProgramData\SoftwareDistribution\OfficeClickToRun.exe

Filesize
929KB

MD5
27e28c0509f0685673ae9435e44f163f

SHA1
384c365e6ceff71f94038c19d6dd72451b128576

SHA256
122f5fbdf16a82a90c358ec2e39933e8a5ef43d76cb4fd63ae68863023ecfa01

SHA512
1cbd42612aee9f5cffb6a55155f397cb657d807955d26fec742041649c359b9c48acf128f0c7e4a866497854153f333e75d3bf613a6f52d7f0836ddbb295cb20

Download Submit
C:\ProgramData\SoftwareDistribution\OfficeClickToRun.exe

Filesize
929KB

MD5
27e28c0509f0685673ae9435e44f163f

SHA1
384c365e6ceff71f94038c19d6dd72451b128576

SHA256
122f5fbdf16a82a90c358ec2e39933e8a5ef43d76cb4fd63ae68863023ecfa01

SHA512
1cbd42612aee9f5cffb6a55155f397cb657d807955d26fec742041649c359b9c48acf128f0c7e4a866497854153f333e75d3bf613a6f52d7f0836ddbb295cb20

Download Submit
C:\ProgramData\SoftwareDistribution\OfficeClickToRun.exe

Filesize
929KB

MD5
27e28c0509f0685673ae9435e44f163f

SHA1
384c365e6ceff71f94038c19d6dd72451b128576

SHA256
122f5fbdf16a82a90c358ec2e39933e8a5ef43d76cb4fd63ae68863023ecfa01

SHA512
1cbd42612aee9f5cffb6a55155f397cb657d807955d26fec742041649c359b9c48acf128f0c7e4a866497854153f333e75d3bf613a6f52d7f0836ddbb295cb20

Download Submit
C:\Users\Admin\AppData\Local\Temp\5znRFlY8cB.bat

Filesize
220B

MD5
f3e3ceb683caf82ed2923340956158ad

SHA1
8207261b679b0bb1af84d9eb9f677aa84a43c326

SHA256
bbbe5fd7b4f80cf78a921c5c38630a1381ad094267fbbe564aee4d850d8a8262

SHA512
34f868013649707fd33ead766f5426d17d3bdc56100a0c526bb92774e5c66e584ed076ffde4ba21f1cf5b243670b1894ef7a554a20424e87fd9424d76a1f8b8c

Download Submit
memory/2980-135-0x00000000014B0000-0x00000000014C0000-memory.dmp

Filesize
64KB

Download
memory/2980-134-0x00007FF8F6A20000-0x00007FF8F74E1000-memory.dmp

Filesize
10.8MB

Download
memory/2980-158-0x00007FF8F6A20000-0x00007FF8F74E1000-memory.dmp

Filesize
10.8MB

Download
memory/2980-133-0x0000000000C30000-0x0000000000D20000-memory.dmp

Filesize
960KB

Download
memory/4340-162-0x00007FF8F5C80000-0x00007FF8F6741000-memory.dmp

Filesize
10.8MB

Download
memory/4340-163-0x0000000002C00000-0x0000000002C10000-memory.dmp

Filesize
64KB

Download
memory/4340-164-0x00007FF8F5C80000-0x00007FF8F6741000-memory.dmp

Filesize
10.8MB

Download
memory/4340-165-0x0000000002C00000-0x0000000002C10000-memory.dmp

Filesize
64KB

Download
memory/4340-167-0x00007FF8F5C80000-0x00007FF8F6741000-memory.dmp

Filesize
10.8MB

Download

Analysis

Sharing

General

Malware Config

Signatures

Processes

Network

MITRE ATT&CK Enterprise v6

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Downloads