dcrat | 0f6215b559b8436f2bd82dacca1a3ea76c1cee35c3f7f526388c0282ecb699db

Resubmissions

30/05/2024, 03:05

240530-dk6b9acb7110

30/05/2024, 03:04

240530-dkymeacb7x10

30/05/2024, 02:59

240530-dgr1fsda3910

Analysis

max time kernel
1791s
max time network
1799s
platform
windows11-21h2_x64
resource
win11-20240508-en
resource tags

arch:x64arch:x86image:win11-20240508-enlocale:en-usos:windows11-21h2-x64system
submitted
30/05/2024, 03:05

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General

Target
c4c83b1a077e713337ea9f76248e9115cebfa105b3338747e3284cd610254581.exe
Size 1000KB
Sample240530-dk6b9acb71
SHA256 c4c83b1a077e713337ea9f76248e9115cebfa105b3338747e3284cd610254581
MD5 b817873fadd6af466832355a47d1e9ae
SHA1 e06db2031ed495fd73c7c0d60cb581702f668ec4
SHA512 1ed7a3060d0f7298f969152968b18db5211ca087480ef650415b297747576e033151bfb5b6494e0e1b79ddc609b25412a3707c475a8cd12f3fca95894a6e4a77
SSDEEP 24576:jzZgodRLKBXQEyRt7d/bZJfKp491BaDwoA:jz9W29vlp9Ok
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	2228	460	schtasks.exe	80
Parent C:\Windows\system32\wbem\wmiprvse.exe is not expected to spawn this process	864	460	schtasks.exe	80
Parent C:\Windows\system32\wbem\wmiprvse.exe is not expected to spawn this process	3648	460	schtasks.exe	80
Parent C:\Windows\system32\wbem\wmiprvse.exe is not expected to spawn this process	1872	460	schtasks.exe	80
Parent C:\Windows\system32\wbem\wmiprvse.exe is not expected to spawn this process	3340	460	schtasks.exe	80
Parent C:\Windows\system32\wbem\wmiprvse.exe is not expected to spawn this process	4756	460	schtasks.exe	80
Parent C:\Windows\system32\wbem\wmiprvse.exe is not expected to spawn this process	1504	460	schtasks.exe	80
Parent C:\Windows\system32\wbem\wmiprvse.exe is not expected to spawn this process	1932	460	schtasks.exe	80
Parent C:\Windows\system32\wbem\wmiprvse.exe is not expected to spawn this process	1364	460	schtasks.exe	80
Parent C:\Windows\system32\wbem\wmiprvse.exe is not expected to spawn this process	1008	460	schtasks.exe	80
Parent C:\Windows\system32\wbem\wmiprvse.exe is not expected to spawn this process	1460	460	schtasks.exe	80
Parent C:\Windows\system32\wbem\wmiprvse.exe is not expected to spawn this process	1488	460	schtasks.exe	80
Parent C:\Windows\system32\wbem\wmiprvse.exe is not expected to spawn this process	1420	460	schtasks.exe	80
Parent C:\Windows\system32\wbem\wmiprvse.exe is not expected to spawn this process	2328	460	schtasks.exe	80
Parent C:\Windows\system32\wbem\wmiprvse.exe is not expected to spawn this process	1268	460	schtasks.exe	80

DCRat payload 2 IoCs

Detects payload of DCRat, commonly dropped by NSIS installers.

rat

resource	yara_rule
behavioral1/memory/1016-1-0x00000000004C0000-0x00000000005C2000-memory.dmp	dcrat
behavioral1/files/0x000100000002a9ed-13.dat	dcrat

Executes dropped EXE 12 IoCs

pid	Process
3884	Registry.exe
3408	smss.exe
4436	RuntimeBroker.exe
1764	Registry.exe
1608	backgroundTaskHost.exe
2448	SearchHost.exe
2892	smss.exe
5036	smss.exe
2388	RuntimeBroker.exe
2848	Registry.exe
936	backgroundTaskHost.exe
1428	SearchHost.exe

Drops file in Program Files directory 6 IoCs

description	ioc	Process
File created	C:\Program Files (x86)\MSBuild\Microsoft\SearchHost.exe	c4c83b1a077e713337ea9f76248e9115cebfa105b3338747e3284cd610254581.exe
File created	C:\Program Files (x86)\MSBuild\Microsoft\cfa885d449487c	c4c83b1a077e713337ea9f76248e9115cebfa105b3338747e3284cd610254581.exe
File created	C:\Program Files (x86)\Internet Explorer\SIGNUP\Registry.exe	c4c83b1a077e713337ea9f76248e9115cebfa105b3338747e3284cd610254581.exe
File created	C:\Program Files (x86)\Internet Explorer\SIGNUP\ee2ad38f3d4382	c4c83b1a077e713337ea9f76248e9115cebfa105b3338747e3284cd610254581.exe
File created	C:\Program Files\Google\Chrome\Application\backgroundTaskHost.exe	c4c83b1a077e713337ea9f76248e9115cebfa105b3338747e3284cd610254581.exe
File created	C:\Program Files\Google\Chrome\Application\eddb19405b7ce1	c4c83b1a077e713337ea9f76248e9115cebfa105b3338747e3284cd610254581.exe

Drops file in Windows directory 3 IoCs

description	ioc	Process
File opened for modification	C:\Windows\Prefetch\ReadyBoot\smss.exe	c4c83b1a077e713337ea9f76248e9115cebfa105b3338747e3284cd610254581.exe
File created	C:\Windows\Prefetch\ReadyBoot\69ddcba757bf72	c4c83b1a077e713337ea9f76248e9115cebfa105b3338747e3284cd610254581.exe
File created	C:\Windows\Prefetch\ReadyBoot\smss.exe	c4c83b1a077e713337ea9f76248e9115cebfa105b3338747e3284cd610254581.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 15 IoCs

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

persistence

Scheduled Task/Job

T1053

pid	Process
2228	schtasks.exe
1504	schtasks.exe
1420	schtasks.exe
1268	schtasks.exe
1872	schtasks.exe
1364	schtasks.exe
1008	schtasks.exe
1460	schtasks.exe
1488	schtasks.exe
864	schtasks.exe
4756	schtasks.exe
1932	schtasks.exe
2328	schtasks.exe
3648	schtasks.exe
3340	schtasks.exe

Suspicious behavior: EnumeratesProcesses 10 IoCs

pid	Process
1016	c4c83b1a077e713337ea9f76248e9115cebfa105b3338747e3284cd610254581.exe
3884	Registry.exe
3884	Registry.exe
3884	Registry.exe
3884	Registry.exe
3884	Registry.exe
3884	Registry.exe
3884	Registry.exe
3884	Registry.exe
3884	Registry.exe

Suspicious behavior: GetForegroundWindowSpam 1 IoCs

pid	Process
3884	Registry.exe

Suspicious use of AdjustPrivilegeToken 13 IoCs

description	pid	Process
Token: SeDebugPrivilege	1016	c4c83b1a077e713337ea9f76248e9115cebfa105b3338747e3284cd610254581.exe
Token: SeDebugPrivilege	3884	Registry.exe
Token: SeDebugPrivilege	3408	smss.exe
Token: SeDebugPrivilege	4436	RuntimeBroker.exe
Token: SeDebugPrivilege	1764	Registry.exe
Token: SeDebugPrivilege	1608	backgroundTaskHost.exe
Token: SeDebugPrivilege	2448	SearchHost.exe
Token: SeDebugPrivilege	2892	smss.exe
Token: SeDebugPrivilege	5036	smss.exe
Token: SeDebugPrivilege	2388	RuntimeBroker.exe
Token: SeDebugPrivilege	2848	Registry.exe
Token: SeDebugPrivilege	936	backgroundTaskHost.exe
Token: SeDebugPrivilege	1428	SearchHost.exe

Suspicious use of WriteProcessMemory 2 IoCs

description	pid	Process	procid_target
PID 1016 wrote to memory of 3884	1016	c4c83b1a077e713337ea9f76248e9115cebfa105b3338747e3284cd610254581.exe	96
PID 1016 wrote to memory of 3884	1016	c4c83b1a077e713337ea9f76248e9115cebfa105b3338747e3284cd610254581.exe	96

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\c4c83b1a077e713337ea9f76248e9115cebfa105b3338747e3284cd610254581.exe
"C:\Users\Admin\AppData\Local\Temp\c4c83b1a077e713337ea9f76248e9115cebfa105b3338747e3284cd610254581.exe"
1⤵
- Drops file in Program Files directory
- Drops file in Windows directory
- Suspicious behavior: EnumeratesProcesses
- Suspicious use of AdjustPrivilegeToken
- Suspicious use of WriteProcessMemory
PID:1016
- C:\Program Files (x86)\Internet Explorer\SIGNUP\Registry.exe
  "C:\Program Files (x86)\Internet Explorer\SIGNUP\Registry.exe"
  2⤵
  - Executes dropped EXE
  - Suspicious behavior: EnumeratesProcesses
  - Suspicious behavior: GetForegroundWindowSpam
  - Suspicious use of AdjustPrivilegeToken
  PID:3884

C:\Windows\system32\schtasks.exe
schtasks.exe /create /tn "smsss" /sc MINUTE /mo 11 /tr "'C:\Windows\Prefetch\ReadyBoot\smss.exe'" /f
1⤵
- Process spawned unexpected child process
- Creates scheduled task(s)
PID:2228

C:\Windows\system32\schtasks.exe
schtasks.exe /create /tn "smss" /sc ONLOGON /tr "'C:\Windows\Prefetch\ReadyBoot\smss.exe'" /rl HIGHEST /f
1⤵
- Process spawned unexpected child process
- Creates scheduled task(s)
PID:864

C:\Windows\system32\schtasks.exe
schtasks.exe /create /tn "smsss" /sc MINUTE /mo 8 /tr "'C:\Windows\Prefetch\ReadyBoot\smss.exe'" /rl HIGHEST /f
1⤵
- Process spawned unexpected child process
- Creates scheduled task(s)
PID:3648

C:\Windows\system32\schtasks.exe
schtasks.exe /create /tn "RuntimeBrokerR" /sc MINUTE /mo 11 /tr "'C:\Users\All Users\Start Menu\RuntimeBroker.exe'" /f
1⤵
- Process spawned unexpected child process
- Creates scheduled task(s)
PID:1872

C:\Windows\system32\schtasks.exe
schtasks.exe /create /tn "RuntimeBroker" /sc ONLOGON /tr "'C:\Users\All Users\Start Menu\RuntimeBroker.exe'" /rl HIGHEST /f
1⤵
- Process spawned unexpected child process
- Creates scheduled task(s)
PID:3340

C:\Windows\system32\schtasks.exe
schtasks.exe /create /tn "RuntimeBrokerR" /sc MINUTE /mo 12 /tr "'C:\Users\All Users\Start Menu\RuntimeBroker.exe'" /rl HIGHEST /f
1⤵
- Process spawned unexpected child process
- Creates scheduled task(s)
PID:4756

C:\Windows\system32\schtasks.exe
schtasks.exe /create /tn "SearchHostS" /sc MINUTE /mo 14 /tr "'C:\Program Files (x86)\MSBuild\Microsoft\SearchHost.exe'" /f
1⤵
- Process spawned unexpected child process
- Creates scheduled task(s)
PID:1504

C:\Windows\system32\schtasks.exe
schtasks.exe /create /tn "SearchHost" /sc ONLOGON /tr "'C:\Program Files (x86)\MSBuild\Microsoft\SearchHost.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 "SearchHostS" /sc MINUTE /mo 14 /tr "'C:\Program Files (x86)\MSBuild\Microsoft\SearchHost.exe'" /rl HIGHEST /f
1⤵
- Process spawned unexpected child process
- Creates scheduled task(s)
PID:1364

C:\Windows\system32\schtasks.exe
schtasks.exe /create /tn "RegistryR" /sc MINUTE /mo 5 /tr "'C:\Program Files (x86)\Internet Explorer\SIGNUP\Registry.exe'" /f
1⤵
- Process spawned unexpected child process
- Creates scheduled task(s)
PID:1008

C:\Windows\system32\schtasks.exe
schtasks.exe /create /tn "Registry" /sc ONLOGON /tr "'C:\Program Files (x86)\Internet Explorer\SIGNUP\Registry.exe'" /rl HIGHEST /f
1⤵
- Process spawned unexpected child process
- Creates scheduled task(s)
PID:1460

C:\Windows\system32\schtasks.exe
schtasks.exe /create /tn "RegistryR" /sc MINUTE /mo 13 /tr "'C:\Program Files (x86)\Internet Explorer\SIGNUP\Registry.exe'" /rl HIGHEST /f
1⤵
- Process spawned unexpected child process
- Creates scheduled task(s)
PID:1488

C:\Windows\system32\schtasks.exe
schtasks.exe /create /tn "backgroundTaskHostb" /sc MINUTE /mo 11 /tr "'C:\Program Files\Google\Chrome\Application\backgroundTaskHost.exe'" /f
1⤵
- Process spawned unexpected child process
- Creates scheduled task(s)
PID:1420

C:\Windows\system32\schtasks.exe
schtasks.exe /create /tn "backgroundTaskHost" /sc ONLOGON /tr "'C:\Program Files\Google\Chrome\Application\backgroundTaskHost.exe'" /rl HIGHEST /f
1⤵
- Process spawned unexpected child process
- Creates scheduled task(s)
PID:2328

C:\Windows\system32\schtasks.exe
schtasks.exe /create /tn "backgroundTaskHostb" /sc MINUTE /mo 14 /tr "'C:\Program Files\Google\Chrome\Application\backgroundTaskHost.exe'" /rl HIGHEST /f
1⤵
- Process spawned unexpected child process
- Creates scheduled task(s)
PID:1268

C:\Windows\Prefetch\ReadyBoot\smss.exe
C:\Windows\Prefetch\ReadyBoot\smss.exe
1⤵
- Executes dropped EXE
- Suspicious use of AdjustPrivilegeToken
PID:3408

C:\Users\All Users\Start Menu\RuntimeBroker.exe
"C:\Users\All Users\Start Menu\RuntimeBroker.exe"
1⤵
- Executes dropped EXE
- Suspicious use of AdjustPrivilegeToken
PID:4436

C:\Program Files (x86)\Internet Explorer\SIGNUP\Registry.exe
"C:\Program Files (x86)\Internet Explorer\SIGNUP\Registry.exe"
1⤵
- Executes dropped EXE
- Suspicious use of AdjustPrivilegeToken
PID:1764

C:\Program Files\Google\Chrome\Application\backgroundTaskHost.exe
"C:\Program Files\Google\Chrome\Application\backgroundTaskHost.exe"
1⤵
- Executes dropped EXE
- Suspicious use of AdjustPrivilegeToken
PID:1608

C:\Program Files (x86)\MSBuild\Microsoft\SearchHost.exe
"C:\Program Files (x86)\MSBuild\Microsoft\SearchHost.exe"
1⤵
- Executes dropped EXE
- Suspicious use of AdjustPrivilegeToken
PID:2448

C:\Windows\Prefetch\ReadyBoot\smss.exe
C:\Windows\Prefetch\ReadyBoot\smss.exe
1⤵
- Executes dropped EXE
- Suspicious use of AdjustPrivilegeToken
PID:2892

C:\Windows\Prefetch\ReadyBoot\smss.exe
C:\Windows\Prefetch\ReadyBoot\smss.exe
1⤵
- Executes dropped EXE
- Suspicious use of AdjustPrivilegeToken
PID:5036

C:\Users\All Users\Start Menu\RuntimeBroker.exe
"C:\Users\All Users\Start Menu\RuntimeBroker.exe"
1⤵
- Executes dropped EXE
- Suspicious use of AdjustPrivilegeToken
PID:2388

C:\Program Files (x86)\Internet Explorer\SIGNUP\Registry.exe
"C:\Program Files (x86)\Internet Explorer\SIGNUP\Registry.exe"
1⤵
- Executes dropped EXE
- Suspicious use of AdjustPrivilegeToken
PID:2848

C:\Program Files\Google\Chrome\Application\backgroundTaskHost.exe
"C:\Program Files\Google\Chrome\Application\backgroundTaskHost.exe"
1⤵
- Executes dropped EXE
- Suspicious use of AdjustPrivilegeToken
PID:936

C:\Program Files (x86)\MSBuild\Microsoft\SearchHost.exe
"C:\Program Files (x86)\MSBuild\Microsoft\SearchHost.exe"
1⤵
- Executes dropped EXE
- Suspicious use of AdjustPrivilegeToken
PID:1428

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

backgroundTaskHost.exe

Path C:\Program Files\Google\Chrome\Application\backgroundTaskHost.exe
Size 1000KB
SHA256 c4c83b1a077e713337ea9f76248e9115cebfa105b3338747e3284cd610254581
MD5 b817873fadd6af466832355a47d1e9ae
SHA1 e06db2031ed495fd73c7c0d60cb581702f668ec4
SHA512 1ed7a3060d0f7298f969152968b18db5211ca087480ef650415b297747576e033151bfb5b6494e0e1b79ddc609b25412a3707c475a8cd12f3fca95894a6e4a77
SSDEEP 24576:jzZgodRLKBXQEyRt7d/bZJfKp491BaDwoA:jz9W29vlp9Ok
MD5 SHA1 SHA512 SSDEEP

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SearchHost.exe.log

Path C:\Users\Admin\AppData\Local\Microsoft\CLR_v4.0\UsageLogs\SearchHost.exe.log
Size 1KB
SHA256 5d8af3c7519874ed42a0d74ee559ae30d9cc6930aef213079347e2b47092c210
MD5 b4e91d2e5f40d5e2586a86cf3bb4df24
SHA1 31920b3a41aa4400d4a0230a7622848789b38672
SHA512 968751b79a98961f145de48d425ea820fd1875bae79a725adf35fc8f4706c103ee0c7babd4838166d8a0dda9fbce3728c0265a04c4b37f335ec4eaa110a2b319
MD5 SHA1 SHA512

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memory/1016-26-0x00007FF9B0370000-0x00007FF9B0E32000-memory.dmp

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memory/1016-3-0x000000001B140000-0x000000001B15C000-memory.dmp

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memory/1016-4-0x000000001B920000-0x000000001B970000-memory.dmp

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memory/1016-2-0x00007FF9B0370000-0x00007FF9B0E32000-memory.dmp

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memory/1016-0-0x00007FF9B0373000-0x00007FF9B0375000-memory.dmp

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memory/1016-1-0x00000000004C0000-0x00000000005C2000-memory.dmp

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memory/3884-27-0x000000001B6A0000-0x000000001B6E6000-memory.dmp

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memory/3884-28-0x0000000002B50000-0x0000000002B59000-memory.dmp

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memory/3884-30-0x000000001B710000-0x000000001B72E000-memory.dmp

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memory/3884-31-0x000000001C590000-0x000000001C59B000-memory.dmp

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memory/3884-29-0x000000001B700000-0x000000001B70D000-memory.dmp

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