dcrat | 8025373f9f407ec8687908aa22b9f50925c1049b7c0c7449b5507f73a0536b3b

Analysis

max time kernel
143s
max time network
158s
platform
windows10-2004_x64
resource
win10v2004-20240226-en
resource tags

arch:x64arch:x86image:win10v2004-20240226-enlocale:en-usos:windows10-2004-x64system
submitted
04/06/2024, 01:54

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General

Target
6b244947ef595c13d24c2121da10beebb1ab3b10c52a04e6b1a104d3c237798b.exe
Size 1.3MB
Sample240604-cbhzxsaa68
SHA256 6b244947ef595c13d24c2121da10beebb1ab3b10c52a04e6b1a104d3c237798b
MD5 1deb00cff6555ece35fe0efab318157f
SHA1 612c66abb6befaefa48af8fe5f5aac9a48fa9846
SHA512 0639c0646d7dc6925dfc4fd3f3886321b8b9612727d50b0b619d850419d96dadf58ab17f918001b8094d8450934b1b83c9102fe135823151334358545d1a655d
SSDEEP 24576:9xp2Oo8yg+sy9X+Q64TNVdsxGdrFN7EUBHOt2f:hDKYQR5DEUB
MD5 SHA1 SHA512 SSDEEP

Score

10^/10

dcrat infostealer rat spyware stealer

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 18 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	4960	3060	schtasks.exe	91
Parent C:\Windows\system32\wbem\wmiprvse.exe is not expected to spawn this process	1768	3060	schtasks.exe	91
Parent C:\Windows\system32\wbem\wmiprvse.exe is not expected to spawn this process	3656	3060	schtasks.exe	91
Parent C:\Windows\system32\wbem\wmiprvse.exe is not expected to spawn this process	4076	3060	schtasks.exe	91
Parent C:\Windows\system32\wbem\wmiprvse.exe is not expected to spawn this process	2460	3060	schtasks.exe	91
Parent C:\Windows\system32\wbem\wmiprvse.exe is not expected to spawn this process	2484	3060	schtasks.exe	91
Parent C:\Windows\system32\wbem\wmiprvse.exe is not expected to spawn this process	4892	3060	schtasks.exe	91
Parent C:\Windows\system32\wbem\wmiprvse.exe is not expected to spawn this process	2960	3060	schtasks.exe	91
Parent C:\Windows\system32\wbem\wmiprvse.exe is not expected to spawn this process	1548	3060	schtasks.exe	91
Parent C:\Windows\system32\wbem\wmiprvse.exe is not expected to spawn this process	228	3060	schtasks.exe	91
Parent C:\Windows\system32\wbem\wmiprvse.exe is not expected to spawn this process	4624	3060	schtasks.exe	91
Parent C:\Windows\system32\wbem\wmiprvse.exe is not expected to spawn this process	1772	3060	schtasks.exe	91
Parent C:\Windows\system32\wbem\wmiprvse.exe is not expected to spawn this process	2928	3060	schtasks.exe	91
Parent C:\Windows\system32\wbem\wmiprvse.exe is not expected to spawn this process	2776	3060	schtasks.exe	91
Parent C:\Windows\system32\wbem\wmiprvse.exe is not expected to spawn this process	4468	3060	schtasks.exe	91
Parent C:\Windows\system32\wbem\wmiprvse.exe is not expected to spawn this process	2320	3060	schtasks.exe	91
Parent C:\Windows\system32\wbem\wmiprvse.exe is not expected to spawn this process	3924	3060	schtasks.exe	91
Parent C:\Windows\system32\wbem\wmiprvse.exe is not expected to spawn this process	1696	3060	schtasks.exe	91

DCRat payload 2 IoCs

Detects payload of DCRat, commonly dropped by NSIS installers.

rat

resource	yara_rule
behavioral2/memory/2136-1-0x0000000000DF0000-0x0000000000F40000-memory.dmp	dcrat
behavioral2/files/0x0007000000023272-17.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-1-5-21-3808065738-1666277613-1125846146-1000\Control Panel\International\Geo\Nation	6b244947ef595c13d24c2121da10beebb1ab3b10c52a04e6b1a104d3c237798b.exe

Executes dropped EXE 1 IoCs

pid	Process
540	RuntimeBroker.exe

Reads user/profile data of web browsers 2 TTPs
Infostealers often target stored browser data, which can include saved credentials etc.
spyware stealer

Data from Local System
T1005

Credentials In Files
T1552.001

Drops file in Program Files directory 6 IoCs

description	ioc	Process
File opened for modification	C:\Program Files (x86)\Windows Mail\spoolsv.exe	6b244947ef595c13d24c2121da10beebb1ab3b10c52a04e6b1a104d3c237798b.exe
File created	C:\Program Files (x86)\Windows Mail\f3b6ecef712a24	6b244947ef595c13d24c2121da10beebb1ab3b10c52a04e6b1a104d3c237798b.exe
File created	C:\Program Files (x86)\Windows NT\TableTextService\en-US\unsecapp.exe	6b244947ef595c13d24c2121da10beebb1ab3b10c52a04e6b1a104d3c237798b.exe
File created	C:\Program Files (x86)\Windows NT\TableTextService\en-US\29c1c3cc0f7685	6b244947ef595c13d24c2121da10beebb1ab3b10c52a04e6b1a104d3c237798b.exe
File created	C:\Program Files\WindowsApps\DeletedAllUserPackages\lsass.exe	6b244947ef595c13d24c2121da10beebb1ab3b10c52a04e6b1a104d3c237798b.exe
File created	C:\Program Files (x86)\Windows Mail\spoolsv.exe	6b244947ef595c13d24c2121da10beebb1ab3b10c52a04e6b1a104d3c237798b.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 18 IoCs

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

persistence

Scheduled Task/Job

T1053

pid	Process
2320	schtasks.exe
2484	schtasks.exe
1772	schtasks.exe
228	schtasks.exe
3924	schtasks.exe
1696	schtasks.exe
4892	schtasks.exe
1548	schtasks.exe
2460	schtasks.exe
2960	schtasks.exe
2928	schtasks.exe
3656	schtasks.exe
4076	schtasks.exe
4624	schtasks.exe
2776	schtasks.exe
4468	schtasks.exe
4960	schtasks.exe
1768	schtasks.exe

Suspicious behavior: EnumeratesProcesses 15 IoCs

pid	Process
2136	6b244947ef595c13d24c2121da10beebb1ab3b10c52a04e6b1a104d3c237798b.exe
540	RuntimeBroker.exe
540	RuntimeBroker.exe
540	RuntimeBroker.exe
540	RuntimeBroker.exe
540	RuntimeBroker.exe
540	RuntimeBroker.exe
540	RuntimeBroker.exe
540	RuntimeBroker.exe
540	RuntimeBroker.exe
540	RuntimeBroker.exe
540	RuntimeBroker.exe
540	RuntimeBroker.exe
540	RuntimeBroker.exe
540	RuntimeBroker.exe

Suspicious behavior: GetForegroundWindowSpam 1 IoCs

pid	Process
540	RuntimeBroker.exe

Suspicious use of AdjustPrivilegeToken 2 IoCs

description	pid	Process
Token: SeDebugPrivilege	2136	6b244947ef595c13d24c2121da10beebb1ab3b10c52a04e6b1a104d3c237798b.exe
Token: SeDebugPrivilege	540	RuntimeBroker.exe

Suspicious use of WriteProcessMemory 2 IoCs

description	pid	Process	procid_target
PID 2136 wrote to memory of 540	2136	6b244947ef595c13d24c2121da10beebb1ab3b10c52a04e6b1a104d3c237798b.exe	111
PID 2136 wrote to memory of 540	2136	6b244947ef595c13d24c2121da10beebb1ab3b10c52a04e6b1a104d3c237798b.exe	111

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\6b244947ef595c13d24c2121da10beebb1ab3b10c52a04e6b1a104d3c237798b.exe
"C:\Users\Admin\AppData\Local\Temp\6b244947ef595c13d24c2121da10beebb1ab3b10c52a04e6b1a104d3c237798b.exe"
1⤵
- Checks computer location settings
- Drops file in Program Files directory
- Suspicious behavior: EnumeratesProcesses
- Suspicious use of AdjustPrivilegeToken
- Suspicious use of WriteProcessMemory
PID:2136
- C:\Users\Public\Desktop\RuntimeBroker.exe
  "C:\Users\Public\Desktop\RuntimeBroker.exe"
  2⤵
  - Executes dropped EXE
  - Suspicious behavior: EnumeratesProcesses
  - Suspicious behavior: GetForegroundWindowSpam
  - Suspicious use of AdjustPrivilegeToken
  PID:540

C:\Windows\system32\schtasks.exe
schtasks.exe /create /tn "spoolsvs" /sc MINUTE /mo 14 /tr "'C:\Program Files (x86)\Windows Mail\spoolsv.exe'" /f
1⤵
- Process spawned unexpected child process
- Creates scheduled task(s)
PID:4960

C:\Windows\system32\schtasks.exe
schtasks.exe /create /tn "spoolsv" /sc ONLOGON /tr "'C:\Program Files (x86)\Windows Mail\spoolsv.exe'" /rl HIGHEST /f
1⤵
- Process spawned unexpected child process
- Creates scheduled task(s)
PID:1768

C:\Windows\system32\schtasks.exe
schtasks.exe /create /tn "spoolsvs" /sc MINUTE /mo 12 /tr "'C:\Program Files (x86)\Windows Mail\spoolsv.exe'" /rl HIGHEST /f
1⤵
- Process spawned unexpected child process
- Creates scheduled task(s)
PID:3656

C:\Windows\system32\schtasks.exe
schtasks.exe /create /tn "SppExtComObjS" /sc MINUTE /mo 13 /tr "'C:\Users\Admin\SppExtComObj.exe'" /f
1⤵
- Process spawned unexpected child process
- Creates scheduled task(s)
PID:4076

C:\Windows\system32\schtasks.exe
schtasks.exe /create /tn "SppExtComObj" /sc ONLOGON /tr "'C:\Users\Admin\SppExtComObj.exe'" /rl HIGHEST /f
1⤵
- Process spawned unexpected child process
- Creates scheduled task(s)
PID:2460

C:\Windows\system32\schtasks.exe
schtasks.exe /create /tn "SppExtComObjS" /sc MINUTE /mo 11 /tr "'C:\Users\Admin\SppExtComObj.exe'" /rl HIGHEST /f
1⤵
- Process spawned unexpected child process
- Creates scheduled task(s)
PID:2484

C:\Windows\system32\schtasks.exe
schtasks.exe /create /tn "SystemS" /sc MINUTE /mo 11 /tr "'C:\Recovery\WindowsRE\System.exe'" /f
1⤵
- Process spawned unexpected child process
- Creates scheduled task(s)
PID:4892

C:\Windows\system32\schtasks.exe
schtasks.exe /create /tn "System" /sc ONLOGON /tr "'C:\Recovery\WindowsRE\System.exe'" /rl HIGHEST /f
1⤵
- Process spawned unexpected child process
- Creates scheduled task(s)
PID:2960

C:\Windows\system32\schtasks.exe
schtasks.exe /create /tn "SystemS" /sc MINUTE /mo 7 /tr "'C:\Recovery\WindowsRE\System.exe'" /rl HIGHEST /f
1⤵
- Process spawned unexpected child process
- Creates scheduled task(s)
PID:1548

C:\Windows\system32\schtasks.exe
schtasks.exe /create /tn "unsecappu" /sc MINUTE /mo 9 /tr "'C:\Program Files (x86)\Windows NT\TableTextService\en-US\unsecapp.exe'" /f
1⤵
- Process spawned unexpected child process
- Creates scheduled task(s)
PID:228

C:\Windows\system32\schtasks.exe
schtasks.exe /create /tn "unsecapp" /sc ONLOGON /tr "'C:\Program Files (x86)\Windows NT\TableTextService\en-US\unsecapp.exe'" /rl HIGHEST /f
1⤵
- Process spawned unexpected child process
- Creates scheduled task(s)
PID:4624

C:\Windows\system32\schtasks.exe
schtasks.exe /create /tn "unsecappu" /sc MINUTE /mo 6 /tr "'C:\Program Files (x86)\Windows NT\TableTextService\en-US\unsecapp.exe'" /rl HIGHEST /f
1⤵
- Process spawned unexpected child process
- Creates scheduled task(s)
PID:1772

C:\Windows\system32\schtasks.exe
schtasks.exe /create /tn "RuntimeBrokerR" /sc MINUTE /mo 10 /tr "'C:\Users\Public\Desktop\RuntimeBroker.exe'" /f
1⤵
- Process spawned unexpected child process
- Creates scheduled task(s)
PID:2928

C:\Windows\system32\schtasks.exe
schtasks.exe /create /tn "RuntimeBroker" /sc ONLOGON /tr "'C:\Users\Public\Desktop\RuntimeBroker.exe'" /rl HIGHEST /f
1⤵
- Process spawned unexpected child process
- Creates scheduled task(s)
PID:2776

C:\Windows\system32\schtasks.exe
schtasks.exe /create /tn "RuntimeBrokerR" /sc MINUTE /mo 5 /tr "'C:\Users\Public\Desktop\RuntimeBroker.exe'" /rl HIGHEST /f
1⤵
- Process spawned unexpected child process
- Creates scheduled task(s)
PID:4468

C:\Windows\system32\schtasks.exe
schtasks.exe /create /tn "RuntimeBrokerR" /sc MINUTE /mo 6 /tr "'C:\odt\RuntimeBroker.exe'" /f
1⤵
- Process spawned unexpected child process
- Creates scheduled task(s)
PID:2320

C:\Windows\system32\schtasks.exe
schtasks.exe /create /tn "RuntimeBroker" /sc ONLOGON /tr "'C:\odt\RuntimeBroker.exe'" /rl HIGHEST /f
1⤵
- Process spawned unexpected child process
- Creates scheduled task(s)
PID:3924

C:\Windows\system32\schtasks.exe
schtasks.exe /create /tn "RuntimeBrokerR" /sc MINUTE /mo 14 /tr "'C:\odt\RuntimeBroker.exe'" /rl HIGHEST /f
1⤵
- Process spawned unexpected child process
- Creates scheduled task(s)
PID:1696

C:\Program Files (x86)\Microsoft\Edge\Application\msedge.exe
"C:\Program Files (x86)\Microsoft\Edge\Application\msedge.exe" --type=utility --utility-sub-type=asset_store.mojom.AssetStoreService --lang=en-US --service-sandbox-type=asset_store_service --no-appcompat-clear --mojo-platform-channel-handle=4112 --field-trial-handle=2292,i,2103142837140538807,15881446839139365070,262144 --variations-seed-version /prefetch:8
1⤵
PID:440

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

Unsecured Credentials

T1552

Credentials In Files

T1552.001

Discovery

Query Registry

T1012

System Information Discovery

T1082

Lateral Movement

Collection

Data from Local System

T1005

Command and Control

Exfiltration

Impact

Replay Monitor

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Downloads

RuntimeBroker.exe

Path C:\Users\Public\Desktop\RuntimeBroker.exe
Size 1.3MB
SHA256 6b244947ef595c13d24c2121da10beebb1ab3b10c52a04e6b1a104d3c237798b
MD5 1deb00cff6555ece35fe0efab318157f
SHA1 612c66abb6befaefa48af8fe5f5aac9a48fa9846
SHA512 0639c0646d7dc6925dfc4fd3f3886321b8b9612727d50b0b619d850419d96dadf58ab17f918001b8094d8450934b1b83c9102fe135823151334358545d1a655d
SSDEEP 24576:9xp2Oo8yg+sy9X+Q64TNVdsxGdrFN7EUBHOt2f:hDKYQR5DEUB
MD5 SHA1 SHA512 SSDEEP

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memory/540-33-0x000000001B5F0000-0x000000001B602000-memory.dmp

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memory/2136-0-0x00007FFE94223000-0x00007FFE94225000-memory.dmp

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memory/2136-1-0x0000000000DF0000-0x0000000000F40000-memory.dmp

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memory/2136-2-0x00007FFE94220000-0x00007FFE94CE1000-memory.dmp

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memory/2136-3-0x000000001BA40000-0x000000001BA5C000-memory.dmp

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memory/2136-4-0x000000001BB00000-0x000000001BB50000-memory.dmp

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memory/2136-5-0x000000001BA60000-0x000000001BA76000-memory.dmp

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memory/2136-6-0x0000000003110000-0x0000000003122000-memory.dmp

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memory/2136-7-0x000000001C9C0000-0x000000001CEE8000-memory.dmp

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memory/2136-8-0x000000001BA00000-0x000000001BA0E000-memory.dmp

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memory/2136-32-0x00007FFE94220000-0x00007FFE94CE1000-memory.dmp

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