dcrat | e52b64a5eb615cd021fcbb9de98cd8ba55bfe8fd7d7a2fc48148b598896169b9

Analysis

max time kernel
147s
max time network
124s
platform
windows10-2004_x64
resource
win10v2004-20240802-en
resource tags

arch:x64arch:x86image:win10v2004-20240802-enlocale:en-usos:windows10-2004-x64system
submitted
16/08/2024, 04:46

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General

Target
444c2b2c686a094c08a0287ce3405fd4.exe
Size 2.3MB
Sample240816-fdy1pswcla
SHA256 e52b64a5eb615cd021fcbb9de98cd8ba55bfe8fd7d7a2fc48148b598896169b9
MD5 444c2b2c686a094c08a0287ce3405fd4
SHA1 e9e42676a131c29e0aa9d08b9ba067551a517c12
SHA512 f4dfc4a7ea4c7601c0176a4e7d63a6a3ab63df1683e773108766095df73bff968c6d7d5c6bcebe71cd85922b80270c3e6a6d17737fab591c8ffc63f68edefffe
SSDEEP 49152:E+RcgUi5SZAvW7DA/01Z77+U0cTrVjpTGR799WbN9+b:9lUTqvWPA/0715/TM05U
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 6 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	1884	2792	schtasks.exe	87
Parent C:\Windows\system32\wbem\wmiprvse.exe is not expected to spawn this process	3676	2792	schtasks.exe	87
Parent C:\Windows\system32\wbem\wmiprvse.exe is not expected to spawn this process	4176	2792	schtasks.exe	87
Parent C:\Windows\system32\wbem\wmiprvse.exe is not expected to spawn this process	1832	2792	schtasks.exe	87
Parent C:\Windows\system32\wbem\wmiprvse.exe is not expected to spawn this process	2160	2792	schtasks.exe	87
Parent C:\Windows\system32\wbem\wmiprvse.exe is not expected to spawn this process	1504	2792	schtasks.exe	87

DCRat payload 2 IoCs

Detects payload of DCRat, commonly dropped by NSIS installers.

rat

resource	yara_rule
behavioral2/memory/4876-1-0x0000000000EB0000-0x0000000001102000-memory.dmp	dcrat
behavioral2/files/0x0008000000023433-25.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-1-5-21-656926755-4116854191-210765258-1000\Control Panel\International\Geo\Nation	444c2b2c686a094c08a0287ce3405fd4.exe

Executes dropped EXE 1 IoCs

pid	Process
4460	RuntimeBroker.exe

Drops file in Program Files directory 3 IoCs

description	ioc	Process
File created	C:\Program Files (x86)\Internet Explorer\SIGNUP\RuntimeBroker.exe	444c2b2c686a094c08a0287ce3405fd4.exe
File opened for modification	C:\Program Files (x86)\Internet Explorer\SIGNUP\RuntimeBroker.exe	444c2b2c686a094c08a0287ce3405fd4.exe
File created	C:\Program Files (x86)\Internet Explorer\SIGNUP\9e8d7a4ca61bd9	444c2b2c686a094c08a0287ce3405fd4.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-1-5-21-656926755-4116854191-210765258-1000_Classes\Local Settings	444c2b2c686a094c08a0287ce3405fd4.exe

Scheduled Task/Job: Scheduled Task 1 TTPs 6 IoCs

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

persistence execution

Scheduled Task

T1053.005

pid	Process
1884	schtasks.exe
3676	schtasks.exe
4176	schtasks.exe
1832	schtasks.exe
2160	schtasks.exe
1504	schtasks.exe

Suspicious behavior: EnumeratesProcesses 4 IoCs

pid	Process
4876	444c2b2c686a094c08a0287ce3405fd4.exe
4876	444c2b2c686a094c08a0287ce3405fd4.exe
4876	444c2b2c686a094c08a0287ce3405fd4.exe
4460	RuntimeBroker.exe

Suspicious use of AdjustPrivilegeToken 2 IoCs

description	pid	Process
Token: SeDebugPrivilege	4876	444c2b2c686a094c08a0287ce3405fd4.exe
Token: SeDebugPrivilege	4460	RuntimeBroker.exe

Suspicious use of WriteProcessMemory 6 IoCs

description	pid	Process	procid_target
PID 4876 wrote to memory of 3752	4876	444c2b2c686a094c08a0287ce3405fd4.exe	94
PID 4876 wrote to memory of 3752	4876	444c2b2c686a094c08a0287ce3405fd4.exe	94
PID 3752 wrote to memory of 3680	3752	cmd.exe	96
PID 3752 wrote to memory of 3680	3752	cmd.exe	96
PID 3752 wrote to memory of 4460	3752	cmd.exe	100
PID 3752 wrote to memory of 4460	3752	cmd.exe	100

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\444c2b2c686a094c08a0287ce3405fd4.exe
"C:\Users\Admin\AppData\Local\Temp\444c2b2c686a094c08a0287ce3405fd4.exe"
1⤵
- Checks computer location settings
- Drops file in Program Files directory
- Modifies registry class
- Suspicious behavior: EnumeratesProcesses
- Suspicious use of AdjustPrivilegeToken
- Suspicious use of WriteProcessMemory
PID:4876
- C:\Windows\System32\cmd.exe
  "C:\Windows\System32\cmd.exe" /C "C:\Users\Admin\AppData\Local\Temp\lIZC7TrDTr.bat"
  2⤵
  - Suspicious use of WriteProcessMemory
  PID:3752
- - C:\Windows\system32\w32tm.exe
    w32tm /stripchart /computer:localhost /period:5 /dataonly /samples:2
    3⤵
    PID:3680
- - C:\Program Files (x86)\Internet Explorer\SIGNUP\RuntimeBroker.exe
    "C:\Program Files (x86)\Internet Explorer\SIGNUP\RuntimeBroker.exe"
    3⤵
    - Executes dropped EXE
    - Suspicious behavior: EnumeratesProcesses
    - Suspicious use of AdjustPrivilegeToken
    PID:4460

C:\Windows\system32\schtasks.exe
schtasks.exe /create /tn "RuntimeBrokerR" /sc MINUTE /mo 6 /tr "'C:\Program Files (x86)\Internet Explorer\SIGNUP\RuntimeBroker.exe'" /f
1⤵
- Process spawned unexpected child process
- Scheduled Task/Job: Scheduled Task
PID:1884

C:\Windows\system32\schtasks.exe
schtasks.exe /create /tn "RuntimeBroker" /sc ONLOGON /tr "'C:\Program Files (x86)\Internet Explorer\SIGNUP\RuntimeBroker.exe'" /rl HIGHEST /f
1⤵
- Process spawned unexpected child process
- Scheduled Task/Job: Scheduled Task
PID:3676

C:\Windows\system32\schtasks.exe
schtasks.exe /create /tn "RuntimeBrokerR" /sc MINUTE /mo 6 /tr "'C:\Program Files (x86)\Internet Explorer\SIGNUP\RuntimeBroker.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 "SppExtComObjS" /sc MINUTE /mo 6 /tr "'C:\Users\Admin\Saved Games\SppExtComObj.exe'" /f
1⤵
- Process spawned unexpected child process
- Scheduled Task/Job: Scheduled Task
PID:1504

C:\Windows\system32\schtasks.exe
schtasks.exe /create /tn "SppExtComObj" /sc ONLOGON /tr "'C:\Users\Admin\Saved Games\SppExtComObj.exe'" /rl HIGHEST /f
1⤵
- Process spawned unexpected child process
- Scheduled Task/Job: Scheduled Task
PID:2160

C:\Windows\system32\schtasks.exe
schtasks.exe /create /tn "SppExtComObjS" /sc MINUTE /mo 12 /tr "'C:\Users\Admin\Saved Games\SppExtComObj.exe'" /rl HIGHEST /f
1⤵
- Process spawned unexpected child process
- Scheduled Task/Job: Scheduled Task
PID:1832

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

Exfiltration

Impact

Replay Monitor

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Downloads

RuntimeBroker.exe

Path C:\Program Files (x86)\Internet Explorer\SIGNUP\RuntimeBroker.exe
Size 2.3MB
SHA256 e52b64a5eb615cd021fcbb9de98cd8ba55bfe8fd7d7a2fc48148b598896169b9
MD5 444c2b2c686a094c08a0287ce3405fd4
SHA1 e9e42676a131c29e0aa9d08b9ba067551a517c12
SHA512 f4dfc4a7ea4c7601c0176a4e7d63a6a3ab63df1683e773108766095df73bff968c6d7d5c6bcebe71cd85922b80270c3e6a6d17737fab591c8ffc63f68edefffe
SSDEEP 49152:E+RcgUi5SZAvW7DA/01Z77+U0cTrVjpTGR799WbN9+b:9lUTqvWPA/0715/TM05U
MD5 SHA1 SHA512 SSDEEP

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lIZC7TrDTr.bat

Path C:\Users\Admin\AppData\Local\Temp\lIZC7TrDTr.bat
Size 230B
SHA256 89a0687700f36c6d88a4bb79c71b272f53a7edac3d1c69ceb78b3e0ef901ad68
MD5 ea6a4c969b6bb2ee2618cc8808580bf5
SHA1 6d8b0e379f28f03f90dd180607ede32963316cb3
SHA512 ca7e38fb0cd83356b9d8de6c23fad4a4698e9df21f2dc7067bc1d5525e0d95aea53e6ad9f54d9a67fa3a7b0e6bc500a562d41076051302f7310489ff7a4b5616
MD5 SHA1 SHA512

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memory/4460-26-0x000000001B7F0000-0x000000001B802000-memory.dmp

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memory/4876-6-0x000000001C2F0000-0x000000001C346000-memory.dmp

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memory/4876-0-0x00007FFFD6953000-0x00007FFFD6955000-memory.dmp

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memory/4876-4-0x000000001C2A0000-0x000000001C2F0000-memory.dmp

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memory/4876-3-0x000000001C230000-0x000000001C24C000-memory.dmp

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memory/4876-7-0x0000000003320000-0x0000000003332000-memory.dmp

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memory/4876-8-0x000000001CB40000-0x000000001D068000-memory.dmp

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memory/4876-9-0x000000001C290000-0x000000001C29E000-memory.dmp

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memory/4876-11-0x000000001C350000-0x000000001C358000-memory.dmp

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memory/4876-10-0x000000001C340000-0x000000001C348000-memory.dmp

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memory/4876-5-0x000000001C250000-0x000000001C266000-memory.dmp

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memory/4876-22-0x00007FFFD6950000-0x00007FFFD7411000-memory.dmp

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memory/4876-2-0x00007FFFD6950000-0x00007FFFD7411000-memory.dmp

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memory/4876-1-0x0000000000EB0000-0x0000000001102000-memory.dmp

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