dcrat | b46875a8a1001af973be5f2b9f8ea9eccc3c87fa8cc85d8a2b4e7b93bdb79dd4

Analysis

max time kernel
125s
max time network
149s
platform
windows10-2004_x64
resource
win10v2004-20240611-en
resource tags

arch:x64arch:x86image:win10v2004-20240611-enlocale:en-usos:windows10-2004-x64system
submitted
15/06/2024, 10:46

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General

Target
incognito.exe
Size 1.4MB
Sample240615-mt4pfsxera
SHA256 b46875a8a1001af973be5f2b9f8ea9eccc3c87fa8cc85d8a2b4e7b93bdb79dd4
MD5 b0e8a9d9dfa09406a6d2a60f52938c70
SHA1 75b046eb99a92ccaa61adb3e3a5367ce32553750
SHA512 0887b62285f5939ce639f1168573e457408252d99124c372573bbd41a861039c13fdf5ae4942d463b4c91341f68c2461667a43cf0ba119d4a5db7c6f42cf41ed
SSDEEP 24576:U2G/nvxW3Ww0tZpGpmEq8NW+MjYTJm4FR9StJ4g7N/M2D3C1X1X:UbA30ZpGpmEkINHMJ4Ielt
MD5 SHA1 SHA512 SSDEEP

Score

10^/10

dcrat evasion infostealer rat trojan

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 9 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	2316	3188	schtasks.exe	92
Parent C:\Windows\system32\wbem\wmiprvse.exe is not expected to spawn this process	1064	3188	schtasks.exe	92
Parent C:\Windows\system32\wbem\wmiprvse.exe is not expected to spawn this process	3980	3188	schtasks.exe	92
Parent C:\Windows\system32\wbem\wmiprvse.exe is not expected to spawn this process	1240	3188	schtasks.exe	92
Parent C:\Windows\system32\wbem\wmiprvse.exe is not expected to spawn this process	4328	3188	schtasks.exe	92
Parent C:\Windows\system32\wbem\wmiprvse.exe is not expected to spawn this process	1548	3188	schtasks.exe	92
Parent C:\Windows\system32\wbem\wmiprvse.exe is not expected to spawn this process	3640	3188	schtasks.exe	92
Parent C:\Windows\system32\wbem\wmiprvse.exe is not expected to spawn this process	3416	3188	schtasks.exe	92
Parent C:\Windows\system32\wbem\wmiprvse.exe is not expected to spawn this process	4788	3188	schtasks.exe	92

UAC bypass 3 TTPs 6 IoCs

evasion trojan

Bypass User Account Control

T1548.002

Disable or Modify Tools

T1562.001

Modify Registry

T1112

description	ioc	Process
Set value (int)	\REGISTRY\MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Policies\System\PromptOnSecureDesktop = "0"	dllhost.exe
Set value (int)	\REGISTRY\MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Policies\System\EnableLUA = "0"	HyperBrokercommon.exe
Set value (int)	\REGISTRY\MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Policies\System\ConsentPromptBehaviorAdmin = "0"	HyperBrokercommon.exe
Set value (int)	\REGISTRY\MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Policies\System\PromptOnSecureDesktop = "0"	HyperBrokercommon.exe
Set value (int)	\REGISTRY\MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Policies\System\EnableLUA = "0"	dllhost.exe
Set value (int)	\REGISTRY\MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Policies\System\ConsentPromptBehaviorAdmin = "0"	dllhost.exe

DCRat payload 2 IoCs

Detects payload of DCRat, commonly dropped by NSIS installers.

rat

resource	yara_rule
behavioral2/files/0x000700000002343d-10.dat	dcrat
behavioral2/memory/1396-13-0x0000000000320000-0x0000000000444000-memory.dmp	dcrat

Checks computer location settings 2 TTPs 3 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-1-5-21-2447855248-390457009-3660902674-1000\Control Panel\International\Geo\Nation	HyperBrokercommon.exe
Key value queried	\REGISTRY\USER\S-1-5-21-2447855248-390457009-3660902674-1000\Control Panel\International\Geo\Nation	incognito.exe
Key value queried	\REGISTRY\USER\S-1-5-21-2447855248-390457009-3660902674-1000\Control Panel\International\Geo\Nation	WScript.exe

Executes dropped EXE 2 IoCs

pid	Process
1396	HyperBrokercommon.exe
3300	dllhost.exe

Checks whether UAC is enabled 1 TTPs 4 IoCs

evasion trojan

System Information Discovery

T1082

description	ioc	Process
Set value (int)	\REGISTRY\MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Policies\System\EnableLUA = "0"	HyperBrokercommon.exe
Key value queried	\REGISTRY\MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Policies\System\EnableLUA	dllhost.exe
Set value (int)	\REGISTRY\MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Policies\System\EnableLUA = "0"	dllhost.exe
Key value queried	\REGISTRY\MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Policies\System\EnableLUA	HyperBrokercommon.exe

Drops file in Program Files directory 2 IoCs

description	ioc	Process
File created	C:\Program Files\Windows NT\Accessories\en-US\lsass.exe	HyperBrokercommon.exe
File created	C:\Program Files\Windows NT\Accessories\en-US\6203df4a6bafc7	HyperBrokercommon.exe

Drops file in Windows directory 1 IoCs

description	ioc	Process
File created	C:\Windows\diagnostics\index\RuntimeBroker.exe	HyperBrokercommon.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 9 IoCs

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

persistence

Scheduled Task/Job

T1053

pid	Process
2316	schtasks.exe
3980	schtasks.exe
1240	schtasks.exe
1548	schtasks.exe
3416	schtasks.exe
4788	schtasks.exe
1064	schtasks.exe
4328	schtasks.exe
3640	schtasks.exe

Modifies registry class 1 IoCs

description	ioc	Process
Key created	\REGISTRY\USER\S-1-5-21-2447855248-390457009-3660902674-1000_Classes\Local Settings	incognito.exe

Suspicious behavior: EnumeratesProcesses 16 IoCs

pid	Process
1396	HyperBrokercommon.exe
1396	HyperBrokercommon.exe
1396	HyperBrokercommon.exe
1396	HyperBrokercommon.exe
1396	HyperBrokercommon.exe
1396	HyperBrokercommon.exe
1396	HyperBrokercommon.exe
3300	dllhost.exe
3300	dllhost.exe
3300	dllhost.exe
3300	dllhost.exe
3300	dllhost.exe
3300	dllhost.exe
3300	dllhost.exe
3300	dllhost.exe
3300	dllhost.exe

Suspicious behavior: GetForegroundWindowSpam 1 IoCs

pid	Process
3300	dllhost.exe

Suspicious use of AdjustPrivilegeToken 2 IoCs

description	pid	Process
Token: SeDebugPrivilege	1396	HyperBrokercommon.exe
Token: SeDebugPrivilege	3300	dllhost.exe

Suspicious use of WriteProcessMemory 10 IoCs

description	pid	Process	procid_target
PID 2520 wrote to memory of 4716	2520	incognito.exe	83
PID 2520 wrote to memory of 4716	2520	incognito.exe	83
PID 2520 wrote to memory of 4716	2520	incognito.exe	83
PID 4716 wrote to memory of 2992	4716	WScript.exe	89
PID 4716 wrote to memory of 2992	4716	WScript.exe	89
PID 4716 wrote to memory of 2992	4716	WScript.exe	89
PID 2992 wrote to memory of 1396	2992	cmd.exe	91
PID 2992 wrote to memory of 1396	2992	cmd.exe	91
PID 1396 wrote to memory of 3300	1396	HyperBrokercommon.exe	102
PID 1396 wrote to memory of 3300	1396	HyperBrokercommon.exe	102

System policy modification 1 TTPs 6 IoCs

evasion

Modify Registry

T1112

description	ioc	Process
Set value (int)	\REGISTRY\MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Policies\System\EnableLUA = "0"	HyperBrokercommon.exe
Set value (int)	\REGISTRY\MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Policies\System\ConsentPromptBehaviorAdmin = "0"	HyperBrokercommon.exe
Set value (int)	\REGISTRY\MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Policies\System\PromptOnSecureDesktop = "0"	HyperBrokercommon.exe
Set value (int)	\REGISTRY\MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Policies\System\EnableLUA = "0"	dllhost.exe
Set value (int)	\REGISTRY\MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Policies\System\ConsentPromptBehaviorAdmin = "0"	dllhost.exe
Set value (int)	\REGISTRY\MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Policies\System\PromptOnSecureDesktop = "0"	dllhost.exe

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\incognito.exe
"C:\Users\Admin\AppData\Local\Temp\incognito.exe"
1⤵
- Checks computer location settings
- Modifies registry class
- Suspicious use of WriteProcessMemory
PID:2520
- C:\Windows\SysWOW64\WScript.exe
  "C:\Windows\System32\WScript.exe" "C:\browserreviewSavesruntimecommon\sALjCX2DJ1FjfO.vbe"
  2⤵
  - Checks computer location settings
  - Suspicious use of WriteProcessMemory
  PID:4716
- - C:\Windows\SysWOW64\cmd.exe
    C:\Windows\system32\cmd.exe /c ""C:\browserreviewSavesruntimecommon\jt4LBgBNIUJsIGJZrjCIK93Fg0t.bat" "
    3⤵
    - Suspicious use of WriteProcessMemory
    PID:2992
  - - C:\browserreviewSavesruntimecommon\HyperBrokercommon.exe
      "C:\browserreviewSavesruntimecommon\HyperBrokercommon.exe"
      4⤵
      UAC bypass
      Checks computer location settings
      Executes dropped EXE
      Checks whether UAC is enabled
      Drops file in Program Files directory
      Drops file in Windows directory
      Suspicious behavior: EnumeratesProcesses
      Suspicious use of AdjustPrivilegeToken
      Suspicious use of WriteProcessMemory
      System policy modification
      PID:1396
    - - C:\Recovery\WindowsRE\dllhost.exe
        
        "C:\Recovery\WindowsRE\dllhost.exe"
        5⤵
        UAC bypass
        Executes dropped EXE
        Checks whether UAC is enabled
        Suspicious behavior: EnumeratesProcesses
        Suspicious behavior: GetForegroundWindowSpam
        Suspicious use of AdjustPrivilegeToken
        System policy modification
        
        PID:3300

C:\Windows\system32\schtasks.exe
schtasks.exe /create /tn "StartMenuExperienceHostS" /sc MINUTE /mo 13 /tr "'C:\Users\Public\StartMenuExperienceHost.exe'" /f
1⤵
- Process spawned unexpected child process
- Creates scheduled task(s)
PID:2316

C:\Windows\system32\schtasks.exe
schtasks.exe /create /tn "StartMenuExperienceHost" /sc ONLOGON /tr "'C:\Users\Public\StartMenuExperienceHost.exe'" /rl HIGHEST /f
1⤵
- Process spawned unexpected child process
- Creates scheduled task(s)
PID:1064

C:\Windows\system32\schtasks.exe
schtasks.exe /create /tn "StartMenuExperienceHostS" /sc MINUTE /mo 12 /tr "'C:\Users\Public\StartMenuExperienceHost.exe'" /rl HIGHEST /f
1⤵
- Process spawned unexpected child process
- Creates scheduled task(s)
PID:3980

C:\Windows\system32\schtasks.exe
schtasks.exe /create /tn "lsassl" /sc MINUTE /mo 12 /tr "'C:\Program Files\Windows NT\Accessories\en-US\lsass.exe'" /f
1⤵
- Process spawned unexpected child process
- Creates scheduled task(s)
PID:1240

C:\Windows\system32\schtasks.exe
schtasks.exe /create /tn "lsass" /sc ONLOGON /tr "'C:\Program Files\Windows NT\Accessories\en-US\lsass.exe'" /rl HIGHEST /f
1⤵
- Process spawned unexpected child process
- Creates scheduled task(s)
PID:4328

C:\Windows\system32\schtasks.exe
schtasks.exe /create /tn "lsassl" /sc MINUTE /mo 8 /tr "'C:\Program Files\Windows NT\Accessories\en-US\lsass.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 "dllhostd" /sc MINUTE /mo 14 /tr "'C:\Recovery\WindowsRE\dllhost.exe'" /f
1⤵
- Process spawned unexpected child process
- Creates scheduled task(s)
PID:3640

C:\Windows\system32\schtasks.exe
schtasks.exe /create /tn "dllhost" /sc ONLOGON /tr "'C:\Recovery\WindowsRE\dllhost.exe'" /rl HIGHEST /f
1⤵
- Process spawned unexpected child process
- Creates scheduled task(s)
PID:3416

C:\Windows\system32\schtasks.exe
schtasks.exe /create /tn "dllhostd" /sc MINUTE /mo 5 /tr "'C:\Recovery\WindowsRE\dllhost.exe'" /rl HIGHEST /f
1⤵
- Process spawned unexpected child process
- Creates scheduled task(s)
PID:4788

Network

MITRE ATT&CK Enterprise v15

Reconnaissance

Resource Development

Initial Access

Execution

Scheduled Task/Job

T1053

Persistence

Scheduled Task/Job

T1053

Privilege Escalation

Abuse Elevation Control Mechanism

T1548

Bypass User Account Control

T1548.002

Scheduled Task/Job

T1053

Defense Evasion

Abuse Elevation Control Mechanism

T1548

Bypass User Account Control

T1548.002

Impair Defenses

T1562

Disable or Modify Tools

T1562.001

Modify Registry

T1112

Credential Access

Discovery

Query Registry

T1012

System Information Discovery

T1082

Lateral Movement

Collection

Command and Control

Exfiltration

Impact

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Downloads

HyperBrokercommon.exe

Path C:\browserreviewSavesruntimecommon\HyperBrokercommon.exe
Size 1.1MB
SHA256 1e502065aa16df514c741ddc34e5857d16baaf7d352c088dbfb239a955430517
MD5 02006b9d56f2799d5fd9ad8a3e9c698d
SHA1 89ba4cba2ede6543a8c3a943e51d05af666ba3b4
SHA512 47efbd1b4b4bc5f6cf2ac17650d1a5bb4af256989ce05ea3e38bdb5eb3f7009784cf34a1a539fbc1ec9c39cf5f0cd10cba746dc117a3c71cab102f2e20dfc2c9
SSDEEP 24576:lpGpmEq8NW+MjYTJm4FR9StJ4g7N/M2D3C1X1:lpGpmEkINHMJ4Iel
MD5 SHA1 SHA512 SSDEEP

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jt4LBgBNIUJsIGJZrjCIK93Fg0t.bat

Path C:\browserreviewSavesruntimecommon\jt4LBgBNIUJsIGJZrjCIK93Fg0t.bat
Size 58B
SHA256 4e815d481c421f6285580f0d77190113a5f21292ac2c69e3a0d62a0797e4fb65
MD5 4c037bd86379e42fb1367ad486900857
SHA1 1c12566e86fc161508cdc1fe77e1fa57682d8782
SHA512 04188af986d5bb7ecbc53f1ef83d7673c8f31b3b187d2e3f0281aa3affec3cda56dfe50b19959dd8ef57aad3af6ddf00f9cf1fd5c48d057f0808769f841ceaf1
MD5 SHA1 SHA512

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sALjCX2DJ1FjfO.vbe

Path C:\browserreviewSavesruntimecommon\sALjCX2DJ1FjfO.vbe
Size 235B
SHA256 87ced7720839bd67e4843c2bb8eaac2de03c608f1a2ee66068f551a3c74ef40f
MD5 5b4c9d21a4263bd3310afbeb618f42e8
SHA1 eae0a7615464b86cb86ba6110dd96d78583d5f3c
SHA512 c2d275195169c7ed9746d2ad0741da073b84903c1c0831adf954f1221faa465a5d31a3885b33303858f66fa82fdb69e4efb058f8e7c36b06eefef900900fefb0
MD5 SHA1 SHA512

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memory/1396-12-0x00007FFDAA9F3000-0x00007FFDAA9F5000-memory.dmp

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memory/1396-13-0x0000000000320000-0x0000000000444000-memory.dmp

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memory/1396-14-0x0000000002680000-0x000000000269C000-memory.dmp

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memory/1396-15-0x000000001AFF0000-0x000000001B040000-memory.dmp

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memory/1396-16-0x0000000000D80000-0x0000000000D8A000-memory.dmp

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memory/1396-17-0x00000000026A0000-0x00000000026AC000-memory.dmp

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memory/1396-18-0x00000000026B0000-0x00000000026BC000-memory.dmp

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