Resubmissions

22-02-2023 08:39

230222-kkja2sae46 10

21-02-2023 11:18

230221-neacqsee96 10

Analysis

  • max time kernel
    41s
  • max time network
    106s
  • platform
    windows7_x64
  • resource
    win7-20230220-en
  • resource tags

    arch:x64arch:x86image:win7-20230220-enlocale:en-usos:windows7-x64system
  • submitted
    21-02-2023 11:18

General

  • Target

    file.exe

  • Size

    3.2MB

  • MD5

    16274daca70d541c57399c2156360124

  • SHA1

    4e5790cb7dbb3714d26140bd319410a90352c340

  • SHA256

    c0bfc01fc145322a9194eb2ca9d75285312805b577bcf8e6ca510d59389f4ab3

  • SHA512

    ecb87230f114d88c0adf791b32d682a97841991274e7654cd498420dc8da61e90738a04e757c3c08cf99df777e5486e4576f94157956f8ce0aba67c8e703cc53

  • SSDEEP

    98304:6CDrrzdb8PIJOvYWrn/LjdPUmTgebZ9X2IXd0v:zDvzdwgJhWrdxtbZl

Malware Config

Extracted

Family

vidar

Version

2.6

Botnet

813

Attributes
  • profile_id

    813

Signatures

  • Vidar

    Vidar is an infostealer based on Arkei stealer.

  • Deletes itself 1 IoCs
  • Loads dropped DLL 2 IoCs
  • Reads user/profile data of web browsers 2 TTPs

    Infostealers often target stored browser data, which can include saved credentials etc.

  • Accesses 2FA software files, possible credential harvesting 2 TTPs
  • Checks installed software on the system 1 TTPs

    Looks up Uninstall key entries in the registry to enumerate software on the system.

  • Enumerates physical storage devices 1 TTPs

    Attempts to interact with connected storage/optical drive(s). Likely ransomware behaviour.

  • Checks processor information in registry 2 TTPs 2 IoCs

    Processor information is often read in order to detect sandboxing environments.

  • Delays execution with timeout.exe 1 IoCs
  • Modifies system certificate store 2 TTPs 3 IoCs
  • Suspicious behavior: EnumeratesProcesses 1 IoCs
  • Suspicious use of WriteProcessMemory 8 IoCs

Processes

  • C:\Users\Admin\AppData\Local\Temp\file.exe
    "C:\Users\Admin\AppData\Local\Temp\file.exe"
    1⤵
    • Loads dropped DLL
    • Checks processor information in registry
    • Modifies system certificate store
    • Suspicious behavior: EnumeratesProcesses
    • Suspicious use of WriteProcessMemory
    PID:1728
    • C:\Windows\SysWOW64\cmd.exe
      "C:\Windows\System32\cmd.exe" /c timeout /t 6 & del /f /q "C:\Users\Admin\AppData\Local\Temp\file.exe" & exit
      2⤵
      • Deletes itself
      • Suspicious use of WriteProcessMemory
      PID:1760
      • C:\Windows\SysWOW64\timeout.exe
        timeout /t 6
        3⤵
        • Delays execution with timeout.exe
        PID:816

Network

MITRE ATT&CK Matrix ATT&CK v6

Defense Evasion

Install Root Certificate

1
T1130

Modify Registry

1
T1112

Credential Access

Credentials in Files

2
T1081

Discovery

Query Registry

2
T1012

System Information Discovery

2
T1082

Collection

Data from Local System

2
T1005

Replay Monitor

Loading Replay Monitor...

Downloads

  • C:\Users\Admin\AppData\Local\Temp\Cab2D79.tmp
    Filesize

    61KB

    MD5

    fc4666cbca561e864e7fdf883a9e6661

    SHA1

    2f8d6094c7a34bf12ea0bbf0d51ee9c5bb7939a5

    SHA256

    10f3deb6c452d749a7451b5d065f4c0449737e5ee8a44f4d15844b503141e65b

    SHA512

    c71f54b571e01f247f072be4bbebdf5d8410b67eb79a61e7e0d9853fe857ab9bd12f53e6af3394b935560178107291fc4be351b27deb388eba90ba949633d57d

  • C:\Users\Admin\AppData\Local\Temp\Tar2DEA.tmp
    Filesize

    161KB

    MD5

    73b4b714b42fc9a6aaefd0ae59adb009

    SHA1

    efdaffd5b0ad21913d22001d91bf6c19ecb4ac41

    SHA256

    c0cf8cc04c34b5b80a2d86ad0eafb2dd71436f070c86b0321fba0201879625fd

    SHA512

    73af3c51b15f89237552b1718bef21fd80788fa416bab2cb2e7fb3a60d56249a716eda0d2dd68ab643752272640e7eaaaf57ce64bcb38373ddc3d035fb8d57cd

  • \ProgramData\mozglue.dll
    Filesize

    593KB

    MD5

    c8fd9be83bc728cc04beffafc2907fe9

    SHA1

    95ab9f701e0024cedfbd312bcfe4e726744c4f2e

    SHA256

    ba06a6ee0b15f5be5c4e67782eec8b521e36c107a329093ec400fe0404eb196a

    SHA512

    fbb446f4a27ef510e616caad52945d6c9cc1fd063812c41947e579ec2b54df57c6dc46237ded80fca5847f38cbe1747a6c66a13e2c8c19c664a72be35eb8b040

  • \ProgramData\nss3.dll
    Filesize

    2.0MB

    MD5

    1cc453cdf74f31e4d913ff9c10acdde2

    SHA1

    6e85eae544d6e965f15fa5c39700fa7202f3aafe

    SHA256

    ac5c92fe6c51cfa742e475215b83b3e11a4379820043263bf50d4068686c6fa5

    SHA512

    dd9ff4e06b00dc831439bab11c10e9b2ae864ea6e780d3835ea7468818f35439f352ef137da111efcdf2bb6465f6ca486719451bf6cf32c6a4420a56b1d64571

  • memory/1728-54-0x0000000000400000-0x00000000009AC000-memory.dmp
    Filesize

    5.7MB

  • memory/1728-56-0x0000000000400000-0x00000000009AC000-memory.dmp
    Filesize

    5.7MB

  • memory/1728-60-0x0000000000400000-0x00000000009AC000-memory.dmp
    Filesize

    5.7MB

  • memory/1728-108-0x0000000000400000-0x00000000009AC000-memory.dmp
    Filesize

    5.7MB

  • memory/1728-109-0x0000000061E00000-0x0000000061EF3000-memory.dmp
    Filesize

    972KB

  • memory/1728-147-0x0000000000400000-0x00000000009AC000-memory.dmp
    Filesize

    5.7MB