Analysis
- max time kernel
149s - max time network
146s - platform
windows10-2004_x64 - resource
win10v2004-20241007-en - resource tags
arch:x64arch:x86image:win10v2004-20241007-enlocale:en-usos:windows10-2004-x64system - submitted
08/11/2024, 22:25
Behavioral task
behavioral1
Sample
4b82207e3ff0a4db17b709c15230254cbb3fe0508bcb437187bc7f7c7709658b.exe
Resource
win7-20240729-en
windows7-x64
19 signatures
150 seconds
General
- Target 4b82207e3ff0a4db17b709c15230254cbb3fe0508bcb437187bc7f7c7709658b.exe
- Size 229KB
- Sample241108-2bysta1enp
- SHA256 4b82207e3ff0a4db17b709c15230254cbb3fe0508bcb437187bc7f7c7709658b
- MD5 aa8c7027403544ed33874be0ddadb997
- SHA1 9fdc216e37f87cda7d0e77020031d4f470fed1ad
- SHA512 cd19de27a5d05f4f975cf88daac522160ce6f30e64d20476273a8993ece4b4465508f5707b72fd9e65a1b0f3d8078c7a6533d800d41840004c5ba80b44aabbb5
- SSDEEP 6144:22IXn2Kid45GqVl4JUiNf1G2fofZ6N96UYc+D:hJo5GYy+Kf1GMWZ62UYc+
- MD5 SHA1 SHA512 SSDEEP
Malware Config
Signatures
- Blocklisted process makes network request 7 IoCs
flow pid Process 15 464 rundll32.exe 21 464 rundll32.exe 23 464 rundll32.exe 24 464 rundll32.exe 41 464 rundll32.exe 48 464 rundll32.exe 49 464 rundll32.exe -
resource yara_rule behavioral2/files/0x000c000000023b9d-4.dat aspack_v212_v242 - Deletes itself 1 IoCs
pid Process 3012 drcacsl.exe - Executes dropped EXE 1 IoCs
pid Process 3012 drcacsl.exe - Loads dropped DLL 1 IoCs
pid Process 464 rundll32.exe - Reads user/profile data of web browsers 3 TTPs
Infostealers often target stored browser data, which can include saved credentials etc.
- Adds Run key to start application 2 TTPs 1 IoCs
description ioc Process Set value (str) \REGISTRY\USER\S-1-5-21-3756129449-3121373848-4276368241-1000\SOFTWARE\Microsoft\Windows\CurrentVersion\Run\Axpol = "c:\\windows\\SysWOW64\\rundll32.exe \"c:\\Program Files\\mgsts\\njagg.dll\",ZipCompress" rundll32.exe - Enumerates connected drives 3 TTPs 23 IoCs
Attempts to read the root path of hard drives other than the default C: drive.
description ioc Process File opened (read-only) \??\b: rundll32.exe File opened (read-only) \??\i: rundll32.exe File opened (read-only) \??\m: rundll32.exe File opened (read-only) \??\o: rundll32.exe File opened (read-only) \??\r: rundll32.exe File opened (read-only) \??\t: rundll32.exe File opened (read-only) \??\z: rundll32.exe File opened (read-only) \??\e: rundll32.exe File opened (read-only) \??\n: rundll32.exe File opened (read-only) \??\u: rundll32.exe File opened (read-only) \??\v: rundll32.exe File opened (read-only) \??\w: rundll32.exe File opened (read-only) \??\x: rundll32.exe File opened (read-only) \??\g: rundll32.exe File opened (read-only) \??\h: rundll32.exe File opened (read-only) \??\k: rundll32.exe File opened (read-only) \??\p: rundll32.exe File opened (read-only) \??\a: rundll32.exe File opened (read-only) \??\j: rundll32.exe File opened (read-only) \??\l: rundll32.exe File opened (read-only) \??\q: rundll32.exe File opened (read-only) \??\s: rundll32.exe File opened (read-only) \??\y: rundll32.exe - Writes to the Master Boot Record (MBR) 1 TTPs 1 IoCs
Bootkits write to the MBR to gain persistence at a level below the operating system.
description ioc Process File opened for modification \??\PHYSICALDRIVE0 rundll32.exe - Suspicious use of NtSetInformationThreadHideFromDebugger 1 IoCs
pid Process 464 rundll32.exe - Drops file in Program Files directory 2 IoCs
description ioc Process File opened for modification \??\c:\Program Files\mgsts drcacsl.exe File created \??\c:\Program Files\mgsts\njagg.dll drcacsl.exe - System Location Discovery: System Language Discovery 1 TTPs 5 IoCs
Attempt gather information about the system language of a victim in order to infer the geographical location of that host.
description ioc Process Key opened \REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language 4b82207e3ff0a4db17b709c15230254cbb3fe0508bcb437187bc7f7c7709658b.exe Key opened \REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language cmd.exe Key opened \REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language PING.EXE Key opened \REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language drcacsl.exe Key opened \REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language rundll32.exe - System Network Configuration Discovery: Internet Connection Discovery 1 TTPs 2 IoCs
Adversaries may check for Internet connectivity on compromised systems.
pid Process 4328 cmd.exe 2132 PING.EXE - Checks processor information in registry 2 TTPs 2 IoCs
Processor information is often read in order to detect sandboxing environments.
description ioc Process Key opened \REGISTRY\MACHINE\HARDWARE\DESCRIPTION\System\CentralProcessor\0 rundll32.exe Key value queried \REGISTRY\MACHINE\HARDWARE\DESCRIPTION\System\CentralProcessor\0\ProcessorNameString rundll32.exe - Runs ping.exe 1 TTPs 1 IoCs
pid Process 2132 PING.EXE - Suspicious behavior: EnumeratesProcesses 64 IoCs
pid Process 464 rundll32.exe 464 rundll32.exe 464 rundll32.exe 464 rundll32.exe 464 rundll32.exe 464 rundll32.exe 464 rundll32.exe 464 rundll32.exe 464 rundll32.exe 464 rundll32.exe 464 rundll32.exe 464 rundll32.exe 464 rundll32.exe 464 rundll32.exe 464 rundll32.exe 464 rundll32.exe 464 rundll32.exe 464 rundll32.exe 464 rundll32.exe 464 rundll32.exe 464 rundll32.exe 464 rundll32.exe 464 rundll32.exe 464 rundll32.exe 464 rundll32.exe 464 rundll32.exe 464 rundll32.exe 464 rundll32.exe 464 rundll32.exe 464 rundll32.exe 464 rundll32.exe 464 rundll32.exe 464 rundll32.exe 464 rundll32.exe 464 rundll32.exe 464 rundll32.exe 464 rundll32.exe 464 rundll32.exe 464 rundll32.exe 464 rundll32.exe 464 rundll32.exe 464 rundll32.exe 464 rundll32.exe 464 rundll32.exe 464 rundll32.exe 464 rundll32.exe 464 rundll32.exe 464 rundll32.exe 464 rundll32.exe 464 rundll32.exe 464 rundll32.exe 464 rundll32.exe 464 rundll32.exe 464 rundll32.exe 464 rundll32.exe 464 rundll32.exe 464 rundll32.exe 464 rundll32.exe 464 rundll32.exe 464 rundll32.exe 464 rundll32.exe 464 rundll32.exe 464 rundll32.exe 464 rundll32.exe - Suspicious use of AdjustPrivilegeToken 1 IoCs
description pid Process Token: SeDebugPrivilege 464 rundll32.exe - Suspicious use of SetWindowsHookEx 2 IoCs
pid Process 852 4b82207e3ff0a4db17b709c15230254cbb3fe0508bcb437187bc7f7c7709658b.exe 3012 drcacsl.exe - Suspicious use of WriteProcessMemory 12 IoCs
description pid Process procid_target PID 852 wrote to memory of 4328 852 4b82207e3ff0a4db17b709c15230254cbb3fe0508bcb437187bc7f7c7709658b.exe 86 PID 852 wrote to memory of 4328 852 4b82207e3ff0a4db17b709c15230254cbb3fe0508bcb437187bc7f7c7709658b.exe 86 PID 852 wrote to memory of 4328 852 4b82207e3ff0a4db17b709c15230254cbb3fe0508bcb437187bc7f7c7709658b.exe 86 PID 4328 wrote to memory of 2132 4328 cmd.exe 88 PID 4328 wrote to memory of 2132 4328 cmd.exe 88 PID 4328 wrote to memory of 2132 4328 cmd.exe 88 PID 4328 wrote to memory of 3012 4328 cmd.exe 89 PID 4328 wrote to memory of 3012 4328 cmd.exe 89 PID 4328 wrote to memory of 3012 4328 cmd.exe 89 PID 3012 wrote to memory of 464 3012 drcacsl.exe 91 PID 3012 wrote to memory of 464 3012 drcacsl.exe 91 PID 3012 wrote to memory of 464 3012 drcacsl.exe 91
Processes
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C:\Users\Admin\AppData\Local\Temp\4b82207e3ff0a4db17b709c15230254cbb3fe0508bcb437187bc7f7c7709658b.exe"C:\Users\Admin\AppData\Local\Temp\4b82207e3ff0a4db17b709c15230254cbb3fe0508bcb437187bc7f7c7709658b.exe"1⤵
- System Location Discovery: System Language Discovery
- Suspicious use of SetWindowsHookEx
- Suspicious use of WriteProcessMemory
PID:852 -
C:\Windows\SysWOW64\cmd.execmd.exe /c ping 127.0.0.1 -n 2&C:\Users\Admin\AppData\Local\Temp\\drcacsl.exe "C:\Users\Admin\AppData\Local\Temp\4b82207e3ff0a4db17b709c15230254cbb3fe0508bcb437187bc7f7c7709658b.exe"2⤵
- System Location Discovery: System Language Discovery
- System Network Configuration Discovery: Internet Connection Discovery
- Suspicious use of WriteProcessMemory
PID:4328 -
C:\Windows\SysWOW64\PING.EXEping 127.0.0.1 -n 23⤵
- System Location Discovery: System Language Discovery
- System Network Configuration Discovery: Internet Connection Discovery
- Runs ping.exe
PID:2132
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C:\Users\Admin\AppData\Local\Temp\drcacsl.exeC:\Users\Admin\AppData\Local\Temp\\drcacsl.exe "C:\Users\Admin\AppData\Local\Temp\4b82207e3ff0a4db17b709c15230254cbb3fe0508bcb437187bc7f7c7709658b.exe"3⤵
- Deletes itself
- Executes dropped EXE
- Drops file in Program Files directory
- System Location Discovery: System Language Discovery
- Suspicious use of SetWindowsHookEx
- Suspicious use of WriteProcessMemory
PID:3012 -
\??\c:\windows\SysWOW64\rundll32.exec:\windows\system32\rundll32.exe "c:\Program Files\mgsts\njagg.dll",ZipCompress C:\Users\Admin\AppData\Local\Temp\drcacsl.exe4⤵
- Blocklisted process makes network request
- Loads dropped DLL
- Adds Run key to start application
- Enumerates connected drives
- Writes to the Master Boot Record (MBR)
- Suspicious use of NtSetInformationThreadHideFromDebugger
- System Location Discovery: System Language Discovery
- Checks processor information in registry
- Suspicious behavior: EnumeratesProcesses
- Suspicious use of AdjustPrivilegeToken
PID:464
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Network
MITRE ATT&CK Enterprise v15
Persistence
Boot or Logon Autostart Execution
1Registry Run Keys / Startup Folder
1Pre-OS Boot
1Bootkit
1Privilege Escalation
Boot or Logon Autostart Execution
1Registry Run Keys / Startup Folder
1Credential Access
Credentials from Password Stores
1Credentials from Web Browsers
1Unsecured Credentials
1Credentials In Files
1Replay Monitor
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Downloads
- Path C:\Users\Admin\AppData\Local\Temp\drcacsl.exe
- Size 229KB
- SHA256 ba43b595ed3df7bbd5b87105098be302b3d80f49295213813a3acea72f693811
- MD5 b7624e2f8ea73d5f160cc6e5326ace71
- SHA1 d4d4fe98b950ec995e87a0c8cb92f88d5edba1bd
- SHA512 14f8a73719d3082a5560d87c5f14bb42aeb3901055944b94256484d28e442f02ddb766ccc54d27f0ab6dffeac9d268dcee2964fcf208fc5f340af4ed8c4cb474
- SSDEEP 6144:22IXn2Kid45GqVl4JUiNf1G2fofZ6N96UYc+Dz:hJo5GYy+Kf1GMWZ62UYc+3
- MD5 SHA1 SHA512 SSDEEP
- Path \??\c:\Program Files\mgsts\njagg.dll
- Size 180KB
- SHA256 2b779657e02ffd020fa98751b179094b2cfba111e1e6bdd91debe45a338c7bb4
- MD5 3a559630ebeadb1e183ccd6d60f57047
- SHA1 64ca936391b18cb3039826f41055373ba0d7d649
- SHA512 c38fc6f45455a3f9a209af11c8245a5508b4215b994de71dd4be9f9c58733b7e2f1ea4d4a3e8ebd212024e5ae0ade57853218bd1a22c0ab72423e86993ca01e7
- SSDEEP 3072:R/q9D8TGRg+2P0XSE0+7GHms91/Eg+lJKkarUTKeaVa/+UJCmwEgC5Vi8tvuG7:I8CgNPISQXsj/MlmYHOa/BJlwEgC5Vis
- MD5 SHA1 SHA512 SSDEEP