dcrat | 87aabada24265836ba604a2b3e8f37a0384ae01cae3554e2bbb0688200e27d01

Analysis

max time kernel
149s
max time network
150s
platform
windows10-2004_x64
resource
win10v2004-20240508-en
resource tags

arch:x64arch:x86image:win10v2004-20240508-enlocale:en-usos:windows10-2004-x64system
submitted
24/05/2024, 08:31

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General

Target
49b61d151699e4fa7e5530b05455450e.exe
Size 828KB
Sample240524-kepwmsbc92
SHA256 87aabada24265836ba604a2b3e8f37a0384ae01cae3554e2bbb0688200e27d01
MD5 49b61d151699e4fa7e5530b05455450e
SHA1 6c292332561fdbd00163b45bdf8f3eee737fadee
SHA512 19ac471f2ff96c09030fd453008cc9744259280af43e87a01329b3378a263ad49ead6c0f4ca14a4223623f7fda116cea8f1f10fdac4cff100c037891059860bd
SSDEEP 12288:ql20oWgRNeR1k5u5cKO6bnfk2jyFdXYygXQARV/pJ:qlqR8R1l5cKvbdjyFdYytg/pJ
MD5 SHA1 SHA512 SSDEEP

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

Process spawned unexpected child process 30 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	4348	5084	schtasks.exe	82
Parent C:\Windows\system32\wbem\wmiprvse.exe is not expected to spawn this process	3512	5084	schtasks.exe	82
Parent C:\Windows\system32\wbem\wmiprvse.exe is not expected to spawn this process	4360	5084	schtasks.exe	82
Parent C:\Windows\system32\wbem\wmiprvse.exe is not expected to spawn this process	3084	5084	schtasks.exe	82
Parent C:\Windows\system32\wbem\wmiprvse.exe is not expected to spawn this process	436	5084	schtasks.exe	82
Parent C:\Windows\system32\wbem\wmiprvse.exe is not expected to spawn this process	3624	5084	schtasks.exe	82
Parent C:\Windows\system32\wbem\wmiprvse.exe is not expected to spawn this process	3204	5084	schtasks.exe	82
Parent C:\Windows\system32\wbem\wmiprvse.exe is not expected to spawn this process	1880	5084	schtasks.exe	82
Parent C:\Windows\system32\wbem\wmiprvse.exe is not expected to spawn this process	3592	5084	schtasks.exe	82
Parent C:\Windows\system32\wbem\wmiprvse.exe is not expected to spawn this process	4716	5084	schtasks.exe	82
Parent C:\Windows\system32\wbem\wmiprvse.exe is not expected to spawn this process	3964	5084	schtasks.exe	82
Parent C:\Windows\system32\wbem\wmiprvse.exe is not expected to spawn this process	4636	5084	schtasks.exe	82
Parent C:\Windows\system32\wbem\wmiprvse.exe is not expected to spawn this process	3832	5084	schtasks.exe	82
Parent C:\Windows\system32\wbem\wmiprvse.exe is not expected to spawn this process	2068	5084	schtasks.exe	82
Parent C:\Windows\system32\wbem\wmiprvse.exe is not expected to spawn this process	3188	5084	schtasks.exe	82
Parent C:\Windows\system32\wbem\wmiprvse.exe is not expected to spawn this process	4680	5084	schtasks.exe	82
Parent C:\Windows\system32\wbem\wmiprvse.exe is not expected to spawn this process	1804	5084	schtasks.exe	82
Parent C:\Windows\system32\wbem\wmiprvse.exe is not expected to spawn this process	964	5084	schtasks.exe	82
Parent C:\Windows\system32\wbem\wmiprvse.exe is not expected to spawn this process	1084	5084	schtasks.exe	82
Parent C:\Windows\system32\wbem\wmiprvse.exe is not expected to spawn this process	2792	5084	schtasks.exe	82
Parent C:\Windows\system32\wbem\wmiprvse.exe is not expected to spawn this process	2708	5084	schtasks.exe	82
Parent C:\Windows\system32\wbem\wmiprvse.exe is not expected to spawn this process	3048	5084	schtasks.exe	82
Parent C:\Windows\system32\wbem\wmiprvse.exe is not expected to spawn this process	4372	5084	schtasks.exe	82
Parent C:\Windows\system32\wbem\wmiprvse.exe is not expected to spawn this process	2876	5084	schtasks.exe	82
Parent C:\Windows\system32\wbem\wmiprvse.exe is not expected to spawn this process	5060	5084	schtasks.exe	82
Parent C:\Windows\system32\wbem\wmiprvse.exe is not expected to spawn this process	4872	5084	schtasks.exe	82
Parent C:\Windows\system32\wbem\wmiprvse.exe is not expected to spawn this process	4212	5084	schtasks.exe	82
Parent C:\Windows\system32\wbem\wmiprvse.exe is not expected to spawn this process	3756	5084	schtasks.exe	82
Parent C:\Windows\system32\wbem\wmiprvse.exe is not expected to spawn this process	2388	5084	schtasks.exe	82
Parent C:\Windows\system32\wbem\wmiprvse.exe is not expected to spawn this process	2252	5084	schtasks.exe	82

DCRat payload 2 IoCs

Detects payload of DCRat, commonly dropped by NSIS installers.

rat

resource	yara_rule
behavioral2/memory/736-1-0x0000000000B90000-0x0000000000C66000-memory.dmp	dcrat
behavioral2/files/0x0007000000023427-11.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-1-5-21-3558294865-3673844354-2255444939-1000\Control Panel\International\Geo\Nation	49b61d151699e4fa7e5530b05455450e.exe

Executes dropped EXE 1 IoCs

pid	Process
2240	winlogon.exe

Drops file in Program Files directory 15 IoCs

description	ioc	Process
File created	C:\Program Files (x86)\Windows Mail\dllhost.exe	49b61d151699e4fa7e5530b05455450e.exe
File created	C:\Program Files\Java\e6c9b481da804f	49b61d151699e4fa7e5530b05455450e.exe
File created	C:\Program Files (x86)\Windows Defender\ee2ad38f3d4382	49b61d151699e4fa7e5530b05455450e.exe
File created	C:\Program Files\Windows Media Player\fr-FR\SearchApp.exe	49b61d151699e4fa7e5530b05455450e.exe
File created	C:\Program Files\Java\OfficeClickToRun.exe	49b61d151699e4fa7e5530b05455450e.exe
File created	C:\Program Files\Microsoft Office 15\ClientX64\SppExtComObj.exe	49b61d151699e4fa7e5530b05455450e.exe
File created	C:\Program Files (x86)\Windows Defender\uk-UA\winlogon.exe	49b61d151699e4fa7e5530b05455450e.exe
File opened for modification	C:\Program Files (x86)\Windows Mail\dllhost.exe	49b61d151699e4fa7e5530b05455450e.exe
File created	C:\Program Files (x86)\Windows Mail\5940a34987c991	49b61d151699e4fa7e5530b05455450e.exe
File created	C:\Program Files\Windows Media Player\fr-FR\38384e6a620884	49b61d151699e4fa7e5530b05455450e.exe
File created	C:\Program Files\Microsoft Office 15\ClientX64\e1ef82546f0b02	49b61d151699e4fa7e5530b05455450e.exe
File created	C:\Program Files (x86)\Windows Defender\uk-UA\cc11b995f2a76d	49b61d151699e4fa7e5530b05455450e.exe
File created	C:\Program Files\WindowsPowerShell\Modules\PSReadline\2.0.0\Registry.exe	49b61d151699e4fa7e5530b05455450e.exe
File created	C:\Program Files\WindowsPowerShell\Modules\PSReadline\2.0.0\ee2ad38f3d4382	49b61d151699e4fa7e5530b05455450e.exe
File created	C:\Program Files (x86)\Windows Defender\Registry.exe	49b61d151699e4fa7e5530b05455450e.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 30 IoCs

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

persistence

Scheduled Task/Job

T1053

pid	Process
4872	schtasks.exe
3084	schtasks.exe
4636	schtasks.exe
2068	schtasks.exe
3832	schtasks.exe
1804	schtasks.exe
3756	schtasks.exe
4372	schtasks.exe
2876	schtasks.exe
2388	schtasks.exe
2252	schtasks.exe
3512	schtasks.exe
3964	schtasks.exe
1084	schtasks.exe
4716	schtasks.exe
964	schtasks.exe
4360	schtasks.exe
3204	schtasks.exe
1880	schtasks.exe
3188	schtasks.exe
3048	schtasks.exe
4212	schtasks.exe
3592	schtasks.exe
2708	schtasks.exe
5060	schtasks.exe
4680	schtasks.exe
2792	schtasks.exe
4348	schtasks.exe
436	schtasks.exe
3624	schtasks.exe

Suspicious behavior: EnumeratesProcesses 10 IoCs

pid	Process
736	49b61d151699e4fa7e5530b05455450e.exe
2240	winlogon.exe
2240	winlogon.exe
2240	winlogon.exe
2240	winlogon.exe
2240	winlogon.exe
2240	winlogon.exe
2240	winlogon.exe
2240	winlogon.exe
2240	winlogon.exe

Suspicious behavior: GetForegroundWindowSpam 1 IoCs

pid	Process
2240	winlogon.exe

Suspicious use of AdjustPrivilegeToken 2 IoCs

description	pid	Process
Token: SeDebugPrivilege	736	49b61d151699e4fa7e5530b05455450e.exe
Token: SeDebugPrivilege	2240	winlogon.exe

Suspicious use of WriteProcessMemory 2 IoCs

description	pid	Process	procid_target
PID 736 wrote to memory of 2240	736	49b61d151699e4fa7e5530b05455450e.exe	113
PID 736 wrote to memory of 2240	736	49b61d151699e4fa7e5530b05455450e.exe	113

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\49b61d151699e4fa7e5530b05455450e.exe
"C:\Users\Admin\AppData\Local\Temp\49b61d151699e4fa7e5530b05455450e.exe"
1⤵
- Checks computer location settings
- Drops file in Program Files directory
- Suspicious behavior: EnumeratesProcesses
- Suspicious use of AdjustPrivilegeToken
- Suspicious use of WriteProcessMemory
PID:736
- C:\Program Files (x86)\Windows Defender\uk-UA\winlogon.exe
  "C:\Program Files (x86)\Windows Defender\uk-UA\winlogon.exe"
  2⤵
  - Executes dropped EXE
  - Suspicious behavior: EnumeratesProcesses
  - Suspicious behavior: GetForegroundWindowSpam
  - Suspicious use of AdjustPrivilegeToken
  PID:2240

C:\Windows\system32\schtasks.exe
schtasks.exe /create /tn "dllhostd" /sc MINUTE /mo 8 /tr "'C:\Program Files (x86)\Windows Mail\dllhost.exe'" /f
1⤵
- Process spawned unexpected child process
- Creates scheduled task(s)
PID:4348

C:\Windows\system32\schtasks.exe
schtasks.exe /create /tn "dllhost" /sc ONLOGON /tr "'C:\Program Files (x86)\Windows Mail\dllhost.exe'" /rl HIGHEST /f
1⤵
- Process spawned unexpected child process
- Creates scheduled task(s)
PID:3512

C:\Windows\system32\schtasks.exe
schtasks.exe /create /tn "dllhostd" /sc MINUTE /mo 5 /tr "'C:\Program Files (x86)\Windows Mail\dllhost.exe'" /rl HIGHEST /f
1⤵
- Process spawned unexpected child process
- Creates scheduled task(s)
PID:4360

C:\Windows\system32\schtasks.exe
schtasks.exe /create /tn "csrssc" /sc MINUTE /mo 8 /tr "'C:\Users\Default User\csrss.exe'" /f
1⤵
- Process spawned unexpected child process
- Creates scheduled task(s)
PID:3084

C:\Windows\system32\schtasks.exe
schtasks.exe /create /tn "csrss" /sc ONLOGON /tr "'C:\Users\Default User\csrss.exe'" /rl HIGHEST /f
1⤵
- Process spawned unexpected child process
- Creates scheduled task(s)
PID:436

C:\Windows\system32\schtasks.exe
schtasks.exe /create /tn "csrssc" /sc MINUTE /mo 9 /tr "'C:\Users\Default User\csrss.exe'" /rl HIGHEST /f
1⤵
- Process spawned unexpected child process
- Creates scheduled task(s)
PID:3624

C:\Windows\system32\schtasks.exe
schtasks.exe /create /tn "TextInputHostT" /sc MINUTE /mo 11 /tr "'C:\Recovery\WindowsRE\TextInputHost.exe'" /f
1⤵
- Process spawned unexpected child process
- Creates scheduled task(s)
PID:3204

C:\Windows\system32\schtasks.exe
schtasks.exe /create /tn "TextInputHost" /sc ONLOGON /tr "'C:\Recovery\WindowsRE\TextInputHost.exe'" /rl HIGHEST /f
1⤵
- Process spawned unexpected child process
- Creates scheduled task(s)
PID:1880

C:\Windows\system32\schtasks.exe
schtasks.exe /create /tn "TextInputHostT" /sc MINUTE /mo 6 /tr "'C:\Recovery\WindowsRE\TextInputHost.exe'" /rl HIGHEST /f
1⤵
- Process spawned unexpected child process
- Creates scheduled task(s)
PID:3592

C:\Windows\system32\schtasks.exe
schtasks.exe /create /tn "RegistryR" /sc MINUTE /mo 14 /tr "'C:\Program Files\WindowsPowerShell\Modules\PSReadline\2.0.0\Registry.exe'" /f
1⤵
- Process spawned unexpected child process
- Creates scheduled task(s)
PID:4716

C:\Windows\system32\schtasks.exe
schtasks.exe /create /tn "Registry" /sc ONLOGON /tr "'C:\Program Files\WindowsPowerShell\Modules\PSReadline\2.0.0\Registry.exe'" /rl HIGHEST /f
1⤵
- Process spawned unexpected child process
- Creates scheduled task(s)
PID:3964

C:\Windows\system32\schtasks.exe
schtasks.exe /create /tn "RegistryR" /sc MINUTE /mo 5 /tr "'C:\Program Files\WindowsPowerShell\Modules\PSReadline\2.0.0\Registry.exe'" /rl HIGHEST /f
1⤵
- Process spawned unexpected child process
- Creates scheduled task(s)
PID:4636

C:\Windows\system32\schtasks.exe
schtasks.exe /create /tn "OfficeClickToRunO" /sc MINUTE /mo 5 /tr "'C:\Program Files\Java\OfficeClickToRun.exe'" /f
1⤵
- Process spawned unexpected child process
- Creates scheduled task(s)
PID:3832

C:\Windows\system32\schtasks.exe
schtasks.exe /create /tn "OfficeClickToRun" /sc ONLOGON /tr "'C:\Program Files\Java\OfficeClickToRun.exe'" /rl HIGHEST /f
1⤵
- Process spawned unexpected child process
- Creates scheduled task(s)
PID:2068

C:\Windows\system32\schtasks.exe
schtasks.exe /create /tn "OfficeClickToRunO" /sc MINUTE /mo 12 /tr "'C:\Program Files\Java\OfficeClickToRun.exe'" /rl HIGHEST /f
1⤵
- Process spawned unexpected child process
- Creates scheduled task(s)
PID:3188

C:\Windows\system32\schtasks.exe
schtasks.exe /create /tn "RegistryR" /sc MINUTE /mo 8 /tr "'C:\Program Files (x86)\Windows Defender\Registry.exe'" /f
1⤵
- Process spawned unexpected child process
- Creates scheduled task(s)
PID:4680

C:\Windows\system32\schtasks.exe
schtasks.exe /create /tn "Registry" /sc ONLOGON /tr "'C:\Program Files (x86)\Windows Defender\Registry.exe'" /rl HIGHEST /f
1⤵
- Process spawned unexpected child process
- Creates scheduled task(s)
PID:1804

C:\Windows\system32\schtasks.exe
schtasks.exe /create /tn "RegistryR" /sc MINUTE /mo 13 /tr "'C:\Program Files (x86)\Windows Defender\Registry.exe'" /rl HIGHEST /f
1⤵
- Process spawned unexpected child process
- Creates scheduled task(s)
PID:964

C:\Windows\system32\schtasks.exe
schtasks.exe /create /tn "SearchAppS" /sc MINUTE /mo 11 /tr "'C:\Program Files\Windows Media Player\fr-FR\SearchApp.exe'" /f
1⤵
- Process spawned unexpected child process
- Creates scheduled task(s)
PID:1084

C:\Windows\system32\schtasks.exe
schtasks.exe /create /tn "SearchApp" /sc ONLOGON /tr "'C:\Program Files\Windows Media Player\fr-FR\SearchApp.exe'" /rl HIGHEST /f
1⤵
- Process spawned unexpected child process
- Creates scheduled task(s)
PID:2792

C:\Windows\system32\schtasks.exe
schtasks.exe /create /tn "SearchAppS" /sc MINUTE /mo 9 /tr "'C:\Program Files\Windows Media Player\fr-FR\SearchApp.exe'" /rl HIGHEST /f
1⤵
- Process spawned unexpected child process
- Creates scheduled task(s)
PID:2708

C:\Windows\system32\schtasks.exe
schtasks.exe /create /tn "SppExtComObjS" /sc MINUTE /mo 10 /tr "'C:\Program Files\Microsoft Office 15\ClientX64\SppExtComObj.exe'" /f
1⤵
- Process spawned unexpected child process
- Creates scheduled task(s)
PID:3048

C:\Windows\system32\schtasks.exe
schtasks.exe /create /tn "SppExtComObj" /sc ONLOGON /tr "'C:\Program Files\Microsoft Office 15\ClientX64\SppExtComObj.exe'" /rl HIGHEST /f
1⤵
- Process spawned unexpected child process
- Creates scheduled task(s)
PID:4372

C:\Windows\system32\schtasks.exe
schtasks.exe /create /tn "SppExtComObjS" /sc MINUTE /mo 8 /tr "'C:\Program Files\Microsoft Office 15\ClientX64\SppExtComObj.exe'" /rl HIGHEST /f
1⤵
- Process spawned unexpected child process
- Creates scheduled task(s)
PID:2876

C:\Windows\system32\schtasks.exe
schtasks.exe /create /tn "csrssc" /sc MINUTE /mo 6 /tr "'C:\Recovery\WindowsRE\csrss.exe'" /f
1⤵
- Process spawned unexpected child process
- Creates scheduled task(s)
PID:5060

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
- Creates scheduled task(s)
PID:4872

C:\Windows\system32\schtasks.exe
schtasks.exe /create /tn "csrssc" /sc MINUTE /mo 11 /tr "'C:\Recovery\WindowsRE\csrss.exe'" /rl HIGHEST /f
1⤵
- Process spawned unexpected child process
- Creates scheduled task(s)
PID:4212

C:\Windows\system32\schtasks.exe
schtasks.exe /create /tn "winlogonw" /sc MINUTE /mo 13 /tr "'C:\Program Files (x86)\Windows Defender\uk-UA\winlogon.exe'" /f
1⤵
- Process spawned unexpected child process
- Creates scheduled task(s)
PID:3756

C:\Windows\system32\schtasks.exe
schtasks.exe /create /tn "winlogon" /sc ONLOGON /tr "'C:\Program Files (x86)\Windows Defender\uk-UA\winlogon.exe'" /rl HIGHEST /f
1⤵
- Process spawned unexpected child process
- Creates scheduled task(s)
PID:2388

C:\Windows\system32\schtasks.exe
schtasks.exe /create /tn "winlogonw" /sc MINUTE /mo 14 /tr "'C:\Program Files (x86)\Windows Defender\uk-UA\winlogon.exe'" /rl HIGHEST /f
1⤵
- Process spawned unexpected child process
- Creates scheduled task(s)
PID:2252

Network

MITRE ATT&CK Enterprise v15

Reconnaissance

Resource Development

Initial Access

Execution

Scheduled Task/Job

T1053

Persistence

Scheduled Task/Job

T1053

Privilege Escalation

Scheduled Task/Job

T1053

Defense Evasion

Credential Access

Discovery

Query Registry

T1012

System Information Discovery

T1082

Lateral Movement

Collection

Command and Control

Exfiltration

Impact

Replay Monitor

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Downloads

OfficeClickToRun.exe

Path C:\Program Files\Java\OfficeClickToRun.exe
Size 828KB
SHA256 87aabada24265836ba604a2b3e8f37a0384ae01cae3554e2bbb0688200e27d01
MD5 49b61d151699e4fa7e5530b05455450e
SHA1 6c292332561fdbd00163b45bdf8f3eee737fadee
SHA512 19ac471f2ff96c09030fd453008cc9744259280af43e87a01329b3378a263ad49ead6c0f4ca14a4223623f7fda116cea8f1f10fdac4cff100c037891059860bd
SSDEEP 12288:ql20oWgRNeR1k5u5cKO6bnfk2jyFdXYygXQARV/pJ:qlqR8R1l5cKvbdjyFdYytg/pJ
MD5 SHA1 SHA512 SSDEEP

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memory/736-0-0x00007FFCFA423000-0x00007FFCFA425000-memory.dmp

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memory/736-1-0x0000000000B90000-0x0000000000C66000-memory.dmp

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memory/736-4-0x00007FFCFA420000-0x00007FFCFAEE1000-memory.dmp

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memory/736-34-0x00007FFCFA420000-0x00007FFCFAEE1000-memory.dmp

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