Analysis

  • max time kernel
    150s
  • max time network
    156s
  • platform
    windows10-2004_x64
  • resource
    win10v2004-20220414-en
  • submitted
    03-06-2022 23:46

General

  • Target

    ebe93e813896e3ca6c9962e493791444bc1f504068190cda5a97a8e987fa0ac1.exe

  • Size

    196KB

  • MD5

    267f042d308639a5273e43990d161c20

  • SHA1

    6373342a1c92e093a84e52dad2b39009cec3d4aa

  • SHA256

    ebe93e813896e3ca6c9962e493791444bc1f504068190cda5a97a8e987fa0ac1

  • SHA512

    dcf1d920a4686e90745cb3da578f4a54ed4fe5af3c2c4af6099a5af94c4283dff59e6eaa02263a02f67f38c0a2a502375ca48437ee220b20c444e63dd2d762c1

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\ebe93e813896e3ca6c9962e493791444bc1f504068190cda5a97a8e987fa0ac1.exe
    "C:\Users\Admin\AppData\Local\Temp\ebe93e813896e3ca6c9962e493791444bc1f504068190cda5a97a8e987fa0ac1.exe"
    1⤵
    • Checks computer location settings
    • Suspicious use of WriteProcessMemory
    PID:4592
    • C:\Windows\SysWOW64\cmd.exe
      "C:\Windows\System32\cmd.exe" /C mkdir C:\Windows\SysWOW64\tigmvqcn\
      2⤵
        PID:5076
      • C:\Windows\SysWOW64\cmd.exe
        "C:\Windows\System32\cmd.exe" /C move /Y "C:\Users\Admin\AppData\Local\Temp\pxdqvyrm.exe" C:\Windows\SysWOW64\tigmvqcn\
        2⤵
          PID:2128
        • C:\Windows\SysWOW64\sc.exe
          "C:\Windows\System32\sc.exe" create tigmvqcn binPath= "C:\Windows\SysWOW64\tigmvqcn\pxdqvyrm.exe /d\"C:\Users\Admin\AppData\Local\Temp\ebe93e813896e3ca6c9962e493791444bc1f504068190cda5a97a8e987fa0ac1.exe\"" type= own start= auto DisplayName= "wifi support"
          2⤵
          • Launches sc.exe
          PID:832
        • C:\Windows\SysWOW64\sc.exe
          "C:\Windows\System32\sc.exe" description tigmvqcn "wifi internet conection"
          2⤵
          • Launches sc.exe
          PID:4556
        • C:\Windows\SysWOW64\sc.exe
          "C:\Windows\System32\sc.exe" start tigmvqcn
          2⤵
          • Launches sc.exe
          PID:4428
        • 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:3776
        • C:\Windows\SysWOW64\WerFault.exe
          C:\Windows\SysWOW64\WerFault.exe -u -p 4592 -s 1040
          2⤵
          • Program crash
          PID:4336
      • C:\Windows\SysWOW64\tigmvqcn\pxdqvyrm.exe
        C:\Windows\SysWOW64\tigmvqcn\pxdqvyrm.exe /d"C:\Users\Admin\AppData\Local\Temp\ebe93e813896e3ca6c9962e493791444bc1f504068190cda5a97a8e987fa0ac1.exe"
        1⤵
        • Executes dropped EXE
        • Suspicious use of SetThreadContext
        • Suspicious use of WriteProcessMemory
        PID:3916
        • 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:4692
          • 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:3692
        • C:\Windows\SysWOW64\WerFault.exe
          C:\Windows\SysWOW64\WerFault.exe -u -p 3916 -s 528
          2⤵
          • Program crash
          PID:5056
      • C:\Windows\SysWOW64\WerFault.exe
        C:\Windows\SysWOW64\WerFault.exe -pss -s 444 -p 4592 -ip 4592
        1⤵
          PID:2804
        • C:\Windows\SysWOW64\WerFault.exe
          C:\Windows\SysWOW64\WerFault.exe -pss -s 420 -p 3916 -ip 3916
          1⤵
            PID:4876

          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\pxdqvyrm.exe
            Filesize

            14.8MB

            MD5

            6fe15038a8ff8b56c307707ac7012924

            SHA1

            22e8eb378053b6c23bb5500a889d6ba97af9937c

            SHA256

            6c23646c439ae615e79f79198a2272b7898d33d1b921cbaaaf2385110d9fbb38

            SHA512

            86cab78f2bb6a84240b528c572ad06950ec42ed12790057915a59aeb56017268a0f8ac770f2d089ff80d972302c38dcacf25aa3af5efafb3675a4168f726f78c

          • C:\Windows\SysWOW64\tigmvqcn\pxdqvyrm.exe
            Filesize

            14.8MB

            MD5

            6fe15038a8ff8b56c307707ac7012924

            SHA1

            22e8eb378053b6c23bb5500a889d6ba97af9937c

            SHA256

            6c23646c439ae615e79f79198a2272b7898d33d1b921cbaaaf2385110d9fbb38

            SHA512

            86cab78f2bb6a84240b528c572ad06950ec42ed12790057915a59aeb56017268a0f8ac770f2d089ff80d972302c38dcacf25aa3af5efafb3675a4168f726f78c

          • memory/832-136-0x0000000000000000-mapping.dmp
          • memory/2128-134-0x0000000000000000-mapping.dmp
          • memory/3692-175-0x0000000000600000-0x00000000006F1000-memory.dmp
            Filesize

            964KB

          • memory/3692-170-0x0000000000600000-0x00000000006F1000-memory.dmp
            Filesize

            964KB

          • memory/3692-169-0x0000000000000000-mapping.dmp
          • memory/3776-140-0x0000000000000000-mapping.dmp
          • memory/3916-148-0x0000000000400000-0x00000000008FB000-memory.dmp
            Filesize

            5.0MB

          • memory/3916-147-0x0000000000B06000-0x0000000000B13000-memory.dmp
            Filesize

            52KB

          • memory/4428-138-0x0000000000000000-mapping.dmp
          • memory/4556-137-0x0000000000000000-mapping.dmp
          • memory/4592-141-0x0000000000CA8000-0x0000000000CB6000-memory.dmp
            Filesize

            56KB

          • memory/4592-142-0x0000000000400000-0x00000000008FB000-memory.dmp
            Filesize

            5.0MB

          • memory/4592-130-0x0000000000CA8000-0x0000000000CB6000-memory.dmp
            Filesize

            56KB

          • memory/4592-132-0x0000000000400000-0x00000000008FB000-memory.dmp
            Filesize

            5.0MB

          • memory/4592-131-0x0000000000A50000-0x0000000000A63000-memory.dmp
            Filesize

            76KB

          • memory/4692-144-0x0000000000A40000-0x0000000000A55000-memory.dmp
            Filesize

            84KB

          • memory/4692-150-0x0000000000A40000-0x0000000000A55000-memory.dmp
            Filesize

            84KB

          • memory/4692-151-0x0000000002600000-0x000000000280F000-memory.dmp
            Filesize

            2.1MB

          • memory/4692-157-0x0000000001DD0000-0x0000000001DE0000-memory.dmp
            Filesize

            64KB

          • memory/4692-154-0x0000000001DC0000-0x0000000001DC6000-memory.dmp
            Filesize

            24KB

          • memory/4692-160-0x0000000001DE0000-0x0000000001DE5000-memory.dmp
            Filesize

            20KB

          • memory/4692-163-0x0000000007600000-0x0000000007A0B000-memory.dmp
            Filesize

            4.0MB

          • memory/4692-166-0x0000000001DF0000-0x0000000001DF7000-memory.dmp
            Filesize

            28KB

          • memory/4692-149-0x0000000000A40000-0x0000000000A55000-memory.dmp
            Filesize

            84KB

          • memory/4692-143-0x0000000000000000-mapping.dmp
          • memory/5076-133-0x0000000000000000-mapping.dmp