dcrat | 14d3c791fbdb14120500093e49fa25a23bd7e9fec3e8f7065e8df3a326359d22

Analysis

max time kernel
132s
max time network
162s
platform
windows10-2004_x64
resource
win10v2004-20240704-en
resource tags

arch:x64arch:x86image:win10v2004-20240704-enlocale:en-usos:windows10-2004-x64system
submitted
08/07/2024, 08:51

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General

Target
1182d9fec1b86ebb19739747de83243e.exe
Size 1.3MB
Sample240708-kr54dsteke
SHA256 14d3c791fbdb14120500093e49fa25a23bd7e9fec3e8f7065e8df3a326359d22
MD5 1182d9fec1b86ebb19739747de83243e
SHA1 c187acb1a82c1e986b87cac0c34045fc4515a8f3
SHA512 fb9de8471b786844228f2c1c4d206f253767539347c999d2b7a37a9128eb2abd207e2f08a27afc853bdceee7bee4d92f7dec6d8db64c65d0d48fd3c014e4bb0b
SSDEEP 24576:kT3VQMmrjL/KL7168n0y2jKPkO/SLAYKR3ToqmE/kD4thm2:c6/yLv2OPkO/RYGeEuohm
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 15 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	3756	1136	schtasks.exe	85
Parent C:\Windows\system32\wbem\wmiprvse.exe is not expected to spawn this process	1264	1136	schtasks.exe	85
Parent C:\Windows\system32\wbem\wmiprvse.exe is not expected to spawn this process	4176	1136	schtasks.exe	85
Parent C:\Windows\system32\wbem\wmiprvse.exe is not expected to spawn this process	324	1136	schtasks.exe	85
Parent C:\Windows\system32\wbem\wmiprvse.exe is not expected to spawn this process	3468	1136	schtasks.exe	85
Parent C:\Windows\system32\wbem\wmiprvse.exe is not expected to spawn this process	1996	1136	schtasks.exe	85
Parent C:\Windows\system32\wbem\wmiprvse.exe is not expected to spawn this process	3548	1136	schtasks.exe	85
Parent C:\Windows\system32\wbem\wmiprvse.exe is not expected to spawn this process	212	1136	schtasks.exe	85
Parent C:\Windows\system32\wbem\wmiprvse.exe is not expected to spawn this process	2436	1136	schtasks.exe	85
Parent C:\Windows\system32\wbem\wmiprvse.exe is not expected to spawn this process	1564	1136	schtasks.exe	85
Parent C:\Windows\system32\wbem\wmiprvse.exe is not expected to spawn this process	808	1136	schtasks.exe	85
Parent C:\Windows\system32\wbem\wmiprvse.exe is not expected to spawn this process	2176	1136	schtasks.exe	85
Parent C:\Windows\system32\wbem\wmiprvse.exe is not expected to spawn this process	1796	1136	schtasks.exe	85
Parent C:\Windows\system32\wbem\wmiprvse.exe is not expected to spawn this process	4568	1136	schtasks.exe	85
Parent C:\Windows\system32\wbem\wmiprvse.exe is not expected to spawn this process	3104	1136	schtasks.exe	85

DCRat payload 2 IoCs

Detects payload of DCRat, commonly dropped by NSIS installers.

rat

resource	yara_rule
behavioral2/memory/2668-1-0x0000000000A70000-0x0000000000BC0000-memory.dmp	dcrat
behavioral2/files/0x0007000000023461-17.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-1-5-21-587429654-1855694383-2268796072-1000\Control Panel\International\Geo\Nation	1182d9fec1b86ebb19739747de83243e.exe

Executes dropped EXE 1 IoCs

pid	Process
912	csrss.exe

Legitimate hosting services abused for malware hosting/C2 1 TTPs 2 IoCs

Web Service

T1102

flow	ioc
12	pastebin.com
11	pastebin.com

Drops file in Program Files directory 2 IoCs

description	ioc	Process
File created	C:\Program Files (x86)\Windows Multimedia Platform\fontdrvhost.exe	1182d9fec1b86ebb19739747de83243e.exe
File created	C:\Program Files (x86)\Windows Multimedia Platform\5b884080fd4f94	1182d9fec1b86ebb19739747de83243e.exe

Drops file in Windows directory 4 IoCs

description	ioc	Process
File created	C:\Windows\PLA\csrss.exe	1182d9fec1b86ebb19739747de83243e.exe
File created	C:\Windows\PLA\886983d96e3d3e	1182d9fec1b86ebb19739747de83243e.exe
File created	C:\Windows\SystemResources\Windows.UI.ShellCommonInetCore\WindowsInternal.Xaml.Controls.Tabs\OfficeClickToRun.exe	1182d9fec1b86ebb19739747de83243e.exe
File created	C:\Windows\SystemResources\Windows.UI.ShellCommonInetCore\WindowsInternal.Xaml.Controls.Tabs\e6c9b481da804f	1182d9fec1b86ebb19739747de83243e.exe

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

System Information Discovery
T1082

Scheduled Task/Job: Scheduled Task 1 TTPs 15 IoCs

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

persistence execution

Scheduled Task

T1053.005

pid	Process
324	schtasks.exe
3468	schtasks.exe
3548	schtasks.exe
2436	schtasks.exe
1564	schtasks.exe
808	schtasks.exe
3756	schtasks.exe
4176	schtasks.exe
3104	schtasks.exe
2176	schtasks.exe
1796	schtasks.exe
1264	schtasks.exe
1996	schtasks.exe
212	schtasks.exe
4568	schtasks.exe

Suspicious behavior: EnumeratesProcesses 12 IoCs

pid	Process
2668	1182d9fec1b86ebb19739747de83243e.exe
2668	1182d9fec1b86ebb19739747de83243e.exe
2668	1182d9fec1b86ebb19739747de83243e.exe
912	csrss.exe
912	csrss.exe
912	csrss.exe
912	csrss.exe
912	csrss.exe
912	csrss.exe
912	csrss.exe
912	csrss.exe
912	csrss.exe

Suspicious behavior: GetForegroundWindowSpam 1 IoCs

pid	Process
912	csrss.exe

Suspicious use of AdjustPrivilegeToken 2 IoCs

description	pid	Process
Token: SeDebugPrivilege	2668	1182d9fec1b86ebb19739747de83243e.exe
Token: SeDebugPrivilege	912	csrss.exe

Suspicious use of WriteProcessMemory 2 IoCs

description	pid	Process	procid_target
PID 2668 wrote to memory of 912	2668	1182d9fec1b86ebb19739747de83243e.exe	101
PID 2668 wrote to memory of 912	2668	1182d9fec1b86ebb19739747de83243e.exe	101

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\1182d9fec1b86ebb19739747de83243e.exe
"C:\Users\Admin\AppData\Local\Temp\1182d9fec1b86ebb19739747de83243e.exe"
1⤵
- Checks computer location settings
- Drops file in Program Files directory
- Drops file in Windows directory
- Suspicious behavior: EnumeratesProcesses
- Suspicious use of AdjustPrivilegeToken
- Suspicious use of WriteProcessMemory
PID:2668
- C:\Windows\PLA\csrss.exe
  "C:\Windows\PLA\csrss.exe"
  2⤵
  - Executes dropped EXE
  - Suspicious behavior: EnumeratesProcesses
  - Suspicious behavior: GetForegroundWindowSpam
  - Suspicious use of AdjustPrivilegeToken
  PID:912

C:\Windows\system32\schtasks.exe
schtasks.exe /create /tn "backgroundTaskHostb" /sc MINUTE /mo 5 /tr "'C:\Users\Default User\backgroundTaskHost.exe'" /f
1⤵
- Process spawned unexpected child process
- Scheduled Task/Job: Scheduled Task
PID:3756

C:\Windows\system32\schtasks.exe
schtasks.exe /create /tn "backgroundTaskHost" /sc ONLOGON /tr "'C:\Users\Default User\backgroundTaskHost.exe'" /rl HIGHEST /f
1⤵
- Process spawned unexpected child process
- Scheduled Task/Job: Scheduled Task
PID:1264

C:\Windows\system32\schtasks.exe
schtasks.exe /create /tn "backgroundTaskHostb" /sc MINUTE /mo 12 /tr "'C:\Users\Default User\backgroundTaskHost.exe'" /rl HIGHEST /f
1⤵
- Process spawned unexpected child process
- Scheduled Task/Job: Scheduled Task
PID:4176

C:\Windows\system32\schtasks.exe
schtasks.exe /create /tn "csrssc" /sc MINUTE /mo 6 /tr "'C:\Windows\PLA\csrss.exe'" /f
1⤵
- Process spawned unexpected child process
- Scheduled Task/Job: Scheduled Task
PID:3468

C:\Windows\system32\schtasks.exe
schtasks.exe /create /tn "csrss" /sc ONLOGON /tr "'C:\Windows\PLA\csrss.exe'" /rl HIGHEST /f
1⤵
- Process spawned unexpected child process
- Scheduled Task/Job: Scheduled Task
PID:324

C:\Windows\system32\schtasks.exe
schtasks.exe /create /tn "csrssc" /sc MINUTE /mo 10 /tr "'C:\Windows\PLA\csrss.exe'" /rl HIGHEST /f
1⤵
- Process spawned unexpected child process
- Scheduled Task/Job: Scheduled Task
PID:1996

C:\Windows\system32\schtasks.exe
schtasks.exe /create /tn "fontdrvhostf" /sc MINUTE /mo 13 /tr "'C:\Users\Default\fontdrvhost.exe'" /f
1⤵
- Process spawned unexpected child process
- Scheduled Task/Job: Scheduled Task
PID:3548

C:\Windows\system32\schtasks.exe
schtasks.exe /create /tn "fontdrvhost" /sc ONLOGON /tr "'C:\Users\Default\fontdrvhost.exe'" /rl HIGHEST /f
1⤵
- Process spawned unexpected child process
- Scheduled Task/Job: Scheduled Task
PID:212

C:\Windows\system32\schtasks.exe
schtasks.exe /create /tn "fontdrvhostf" /sc MINUTE /mo 13 /tr "'C:\Users\Default\fontdrvhost.exe'" /rl HIGHEST /f
1⤵
- Process spawned unexpected child process
- Scheduled Task/Job: Scheduled Task
PID:2436

C:\Windows\system32\schtasks.exe
schtasks.exe /create /tn "fontdrvhostf" /sc MINUTE /mo 10 /tr "'C:\Program Files (x86)\Windows Multimedia Platform\fontdrvhost.exe'" /f
1⤵
- Process spawned unexpected child process
- Scheduled Task/Job: Scheduled Task
PID:1564

C:\Windows\system32\schtasks.exe
schtasks.exe /create /tn "fontdrvhost" /sc ONLOGON /tr "'C:\Program Files (x86)\Windows Multimedia Platform\fontdrvhost.exe'" /rl HIGHEST /f
1⤵
- Process spawned unexpected child process
- Scheduled Task/Job: Scheduled Task
PID:808

C:\Windows\system32\schtasks.exe
schtasks.exe /create /tn "fontdrvhostf" /sc MINUTE /mo 9 /tr "'C:\Program Files (x86)\Windows Multimedia Platform\fontdrvhost.exe'" /rl HIGHEST /f
1⤵
- Process spawned unexpected child process
- Scheduled Task/Job: Scheduled Task
PID:2176

C:\Windows\system32\schtasks.exe
schtasks.exe /create /tn "OfficeClickToRunO" /sc MINUTE /mo 10 /tr "'C:\Windows\SystemResources\Windows.UI.ShellCommonInetCore\WindowsInternal.Xaml.Controls.Tabs\OfficeClickToRun.exe'" /f
1⤵
- Process spawned unexpected child process
- Scheduled Task/Job: Scheduled Task
PID:1796

C:\Windows\system32\schtasks.exe
schtasks.exe /create /tn "OfficeClickToRun" /sc ONLOGON /tr "'C:\Windows\SystemResources\Windows.UI.ShellCommonInetCore\WindowsInternal.Xaml.Controls.Tabs\OfficeClickToRun.exe'" /rl HIGHEST /f
1⤵
- Process spawned unexpected child process
- Scheduled Task/Job: Scheduled Task
PID:4568

C:\Windows\system32\schtasks.exe
schtasks.exe /create /tn "OfficeClickToRunO" /sc MINUTE /mo 6 /tr "'C:\Windows\SystemResources\Windows.UI.ShellCommonInetCore\WindowsInternal.Xaml.Controls.Tabs\OfficeClickToRun.exe'" /rl HIGHEST /f
1⤵
- Process spawned unexpected child process
- Scheduled Task/Job: Scheduled Task
PID:3104

Network

MITRE ATT&CK Enterprise v15

Reconnaissance

Resource Development

Initial Access

Execution

Scheduled Task/Job

T1053

Scheduled Task

T1053.005

Persistence

Scheduled Task/Job

T1053

Scheduled Task

T1053.005

Privilege Escalation

Scheduled Task/Job

T1053

Scheduled Task

T1053.005

Defense Evasion

Credential Access

Discovery

Query Registry

T1012

System Information Discovery

T1082

Lateral Movement

Collection

Command and Control

Web Service

T1102

Exfiltration

Impact

Replay Monitor

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Downloads

OfficeClickToRun.exe

Path C:\Windows\SystemResources\Windows.UI.ShellCommonInetCore\WindowsInternal.Xaml.Controls.Tabs\OfficeClickToRun.exe
Size 1.3MB
SHA256 14d3c791fbdb14120500093e49fa25a23bd7e9fec3e8f7065e8df3a326359d22
MD5 1182d9fec1b86ebb19739747de83243e
SHA1 c187acb1a82c1e986b87cac0c34045fc4515a8f3
SHA512 fb9de8471b786844228f2c1c4d206f253767539347c999d2b7a37a9128eb2abd207e2f08a27afc853bdceee7bee4d92f7dec6d8db64c65d0d48fd3c014e4bb0b
SSDEEP 24576:kT3VQMmrjL/KL7168n0y2jKPkO/SLAYKR3ToqmE/kD4thm2:c6/yLv2OPkO/RYGeEuohm
MD5 SHA1 SHA512 SSDEEP

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memory/2668-0-0x00007FFCFCCB3000-0x00007FFCFCCB5000-memory.dmp

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memory/2668-1-0x0000000000A70000-0x0000000000BC0000-memory.dmp

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memory/2668-2-0x0000000002C30000-0x0000000002C4C000-memory.dmp

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memory/2668-4-0x0000000002D00000-0x0000000002D16000-memory.dmp

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memory/2668-5-0x0000000002D20000-0x0000000002D32000-memory.dmp

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memory/2668-3-0x000000001B840000-0x000000001B890000-memory.dmp

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memory/2668-6-0x00007FFCFCCB0000-0x00007FFCFD771000-memory.dmp

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memory/2668-7-0x000000001C510000-0x000000001CA38000-memory.dmp

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memory/2668-8-0x0000000002CC0000-0x0000000002CCE000-memory.dmp

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memory/2668-30-0x00007FFCFCCB0000-0x00007FFCFD771000-memory.dmp

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