Analysis

  • max time kernel
    147s
  • max time network
    152s
  • platform
    windows10-2004_x64
  • resource
    win10v2004-20231023-en
  • resource tags

    arch:x64arch:x86image:win10v2004-20231023-enlocale:en-usos:windows10-2004-x64system
  • submitted
    06/11/2023, 10:05

General

  • Target

    abb89870a6ffac63572b4f2026957ee5c75eaeb17db0eec61629333da244ba44.exe

  • Size

    256KB

  • MD5

    fef3091059af5ae452cd4554a7fb2f31

  • SHA1

    6716795202f0eb637e61b5c2e12561e4587b322d

  • SHA256

    abb89870a6ffac63572b4f2026957ee5c75eaeb17db0eec61629333da244ba44

  • SHA512

    f895a12bf19419bdc0392b215d135acf2acd0479ca632b807529a68c52cfb60603bb9a462c380d2c15031819e87db6ce13cc987ac385891dabc31760401e6a6b

  • SSDEEP

    3072:yr992I1yxYhjZjXLR1EalWmPEDUvz64IeF+GA52A26Q3GLeJig/oGOUZ:TI1yK1LRuaQmP2+B9FXRGKJ1o

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.

  • 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.

  • Deletes itself 1 IoCs
  • Executes dropped EXE 1 IoCs
  • Drops file in System32 directory 2 IoCs
  • Suspicious use of SetThreadContext 1 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
  • GoLang User-Agent 1 IoCs

    Uses default user-agent string defined by GoLang HTTP packages.

  • Modifies data under HKEY_USERS 7 IoCs
  • Suspicious use of WriteProcessMemory 23 IoCs

Processes

  • C:\Users\Admin\AppData\Local\Temp\abb89870a6ffac63572b4f2026957ee5c75eaeb17db0eec61629333da244ba44.exe
    "C:\Users\Admin\AppData\Local\Temp\abb89870a6ffac63572b4f2026957ee5c75eaeb17db0eec61629333da244ba44.exe"
    1⤵
    • Checks computer location settings
    • Suspicious use of WriteProcessMemory
    PID:2480
    • C:\Windows\SysWOW64\cmd.exe
      "C:\Windows\System32\cmd.exe" /C mkdir C:\Windows\SysWOW64\qavradnf\
      2⤵
        PID:440
      • C:\Windows\SysWOW64\cmd.exe
        "C:\Windows\System32\cmd.exe" /C move /Y "C:\Users\Admin\AppData\Local\Temp\amcpdcuy.exe" C:\Windows\SysWOW64\qavradnf\
        2⤵
          PID:1964
        • C:\Windows\SysWOW64\sc.exe
          "C:\Windows\System32\sc.exe" create qavradnf binPath= "C:\Windows\SysWOW64\qavradnf\amcpdcuy.exe /d\"C:\Users\Admin\AppData\Local\Temp\abb89870a6ffac63572b4f2026957ee5c75eaeb17db0eec61629333da244ba44.exe\"" type= own start= auto DisplayName= "wifi support"
          2⤵
          • Launches sc.exe
          PID:4332
        • C:\Windows\SysWOW64\sc.exe
          "C:\Windows\System32\sc.exe" description qavradnf "wifi internet conection"
          2⤵
          • Launches sc.exe
          PID:1452
        • C:\Windows\SysWOW64\sc.exe
          "C:\Windows\System32\sc.exe" start qavradnf
          2⤵
          • Launches sc.exe
          PID:2244
        • 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:2808
        • C:\Windows\SysWOW64\WerFault.exe
          C:\Windows\SysWOW64\WerFault.exe -u -p 2480 -s 1316
          2⤵
          • Program crash
          PID:3972
      • C:\Windows\SysWOW64\qavradnf\amcpdcuy.exe
        C:\Windows\SysWOW64\qavradnf\amcpdcuy.exe /d"C:\Users\Admin\AppData\Local\Temp\abb89870a6ffac63572b4f2026957ee5c75eaeb17db0eec61629333da244ba44.exe"
        1⤵
        • Executes dropped EXE
        • Suspicious use of SetThreadContext
        • Suspicious use of WriteProcessMemory
        PID:2392
        • C:\Windows\SysWOW64\svchost.exe
          svchost.exe
          2⤵
          • Sets service image path in registry
          • Deletes itself
          • Drops file in System32 directory
          • Modifies data under HKEY_USERS
          PID:2232
        • C:\Windows\SysWOW64\WerFault.exe
          C:\Windows\SysWOW64\WerFault.exe -u -p 2392 -s 516
          2⤵
          • Program crash
          PID:3112
      • C:\Windows\SysWOW64\WerFault.exe
        C:\Windows\SysWOW64\WerFault.exe -pss -s 444 -p 2480 -ip 2480
        1⤵
          PID:2552
        • C:\Windows\SysWOW64\WerFault.exe
          C:\Windows\SysWOW64\WerFault.exe -pss -s 560 -p 2392 -ip 2392
          1⤵
            PID:4316

          Network

                MITRE ATT&CK Enterprise v15

                Replay Monitor

                Loading Replay Monitor...

                Downloads

                • C:\Users\Admin\AppData\Local\Temp\amcpdcuy.exe

                  Filesize

                  13.8MB

                  MD5

                  7ae82b1bc5bb2f41def3fabebb9b44b3

                  SHA1

                  10322c68927ac37f0ac8a2cbe1724848af48a536

                  SHA256

                  3bec0012166a040731f6afb3774b14a5c8804917708fadcc4c0d127bb2105017

                  SHA512

                  eebb2f68a520871e4a47803fcd2d0a5d74d9841ffda4942dbb35b00f112290d98c5d9dcea2868110b4ee952a89333f6b41ec0a87abfa68d222627d5a4ae4e69f

                • C:\Windows\SysWOW64\qavradnf\amcpdcuy.exe

                  Filesize

                  13.8MB

                  MD5

                  7ae82b1bc5bb2f41def3fabebb9b44b3

                  SHA1

                  10322c68927ac37f0ac8a2cbe1724848af48a536

                  SHA256

                  3bec0012166a040731f6afb3774b14a5c8804917708fadcc4c0d127bb2105017

                  SHA512

                  eebb2f68a520871e4a47803fcd2d0a5d74d9841ffda4942dbb35b00f112290d98c5d9dcea2868110b4ee952a89333f6b41ec0a87abfa68d222627d5a4ae4e69f

                • memory/2232-33-0x0000000001B90000-0x0000000001BA0000-memory.dmp

                  Filesize

                  64KB

                • memory/2232-34-0x0000000001B90000-0x0000000001BA0000-memory.dmp

                  Filesize

                  64KB

                • memory/2232-55-0x0000000007300000-0x000000000770B000-memory.dmp

                  Filesize

                  4.0MB

                • memory/2232-56-0x0000000001BF0000-0x0000000001BF7000-memory.dmp

                  Filesize

                  28KB

                • memory/2232-52-0x0000000007300000-0x000000000770B000-memory.dmp

                  Filesize

                  4.0MB

                • memory/2232-51-0x0000000001BE0000-0x0000000001BE5000-memory.dmp

                  Filesize

                  20KB

                • memory/2232-48-0x0000000001BE0000-0x0000000001BE5000-memory.dmp

                  Filesize

                  20KB

                • memory/2232-12-0x00000000006D0000-0x00000000006E5000-memory.dmp

                  Filesize

                  84KB

                • memory/2232-16-0x00000000006D0000-0x00000000006E5000-memory.dmp

                  Filesize

                  84KB

                • memory/2232-35-0x0000000001B90000-0x0000000001BA0000-memory.dmp

                  Filesize

                  64KB

                • memory/2232-18-0x00000000006D0000-0x00000000006E5000-memory.dmp

                  Filesize

                  84KB

                • memory/2232-20-0x00000000006D0000-0x00000000006E5000-memory.dmp

                  Filesize

                  84KB

                • memory/2232-21-0x0000000002400000-0x000000000260F000-memory.dmp

                  Filesize

                  2.1MB

                • memory/2232-24-0x0000000002400000-0x000000000260F000-memory.dmp

                  Filesize

                  2.1MB

                • memory/2232-25-0x0000000001B80000-0x0000000001B86000-memory.dmp

                  Filesize

                  24KB

                • memory/2232-28-0x0000000001B90000-0x0000000001BA0000-memory.dmp

                  Filesize

                  64KB

                • memory/2232-31-0x0000000001B90000-0x0000000001BA0000-memory.dmp

                  Filesize

                  64KB

                • memory/2232-32-0x0000000001B90000-0x0000000001BA0000-memory.dmp

                  Filesize

                  64KB

                • memory/2232-46-0x0000000001B90000-0x0000000001BA0000-memory.dmp

                  Filesize

                  64KB

                • memory/2232-47-0x0000000001B90000-0x0000000001BA0000-memory.dmp

                  Filesize

                  64KB

                • memory/2232-44-0x0000000001B90000-0x0000000001BA0000-memory.dmp

                  Filesize

                  64KB

                • memory/2232-36-0x0000000001B90000-0x0000000001BA0000-memory.dmp

                  Filesize

                  64KB

                • memory/2232-37-0x0000000001B90000-0x0000000001BA0000-memory.dmp

                  Filesize

                  64KB

                • memory/2232-39-0x0000000001B90000-0x0000000001BA0000-memory.dmp

                  Filesize

                  64KB

                • memory/2232-38-0x0000000001B90000-0x0000000001BA0000-memory.dmp

                  Filesize

                  64KB

                • memory/2232-40-0x0000000001B90000-0x0000000001BA0000-memory.dmp

                  Filesize

                  64KB

                • memory/2232-41-0x0000000001B90000-0x0000000001BA0000-memory.dmp

                  Filesize

                  64KB

                • memory/2232-42-0x0000000001B90000-0x0000000001BA0000-memory.dmp

                  Filesize

                  64KB

                • memory/2232-43-0x0000000001B90000-0x0000000001BA0000-memory.dmp

                  Filesize

                  64KB

                • memory/2232-45-0x0000000001B90000-0x0000000001BA0000-memory.dmp

                  Filesize

                  64KB

                • memory/2392-17-0x0000000000400000-0x00000000007CA000-memory.dmp

                  Filesize

                  3.8MB

                • memory/2392-11-0x0000000000400000-0x00000000007CA000-memory.dmp

                  Filesize

                  3.8MB

                • memory/2392-10-0x0000000000940000-0x0000000000A40000-memory.dmp

                  Filesize

                  1024KB

                • memory/2480-1-0x0000000000B40000-0x0000000000C40000-memory.dmp

                  Filesize

                  1024KB

                • memory/2480-4-0x0000000000400000-0x00000000007CA000-memory.dmp

                  Filesize

                  3.8MB

                • memory/2480-8-0x0000000002510000-0x0000000002523000-memory.dmp

                  Filesize

                  76KB

                • memory/2480-7-0x0000000000400000-0x00000000007CA000-memory.dmp

                  Filesize

                  3.8MB

                • memory/2480-2-0x0000000002510000-0x0000000002523000-memory.dmp

                  Filesize

                  76KB