Analysis

  • max time kernel
    153s
  • max time network
    86s
  • platform
    windows7_x64
  • resource
    win7-20221111-en
  • resource tags

    arch:x64arch:x86image:win7-20221111-enlocale:en-usos:windows7-x64system
  • submitted
    23-11-2022 13:39

General

  • Target

    Transfer slip.xls

  • Size

    1.0MB

  • MD5

    e02848eb9256c23985ce2d92f1eb3fed

  • SHA1

    59070bd92b372770242c0d0fe7f1bfcf86df7e80

  • SHA256

    d66bc7fd9f24dcf99ceb2c76a3996903d94c260fff462dc2152c1e1d74e8a345

  • SHA512

    ed52ff8f2b97bf05decf84a0fe276afa0943bb95f1ab3ec6c7fd25ec1039e724325cfb6030d397f7aa7fd7b4004711cc0faa9647e3bb0c5a2024b12b987fa792

  • SSDEEP

    24576:1r5XXXXXXXXXXXXUXXXXXXXSXXXXXXXXgm7r5XXXXXXXXXXXXUXXXXXXXSXXXXXF:V

Malware Config

Extracted

Family

formbook

Campaign

dcn0

Decoy

ZVx68vDtAMBCwg==

oBMBvsNORkM/O/ox

Ff9pISWkm6eG4lByIspp

c2T42c6CIIF6B8xTxm9XzpVw

bvjhxRbnAC183w==

0lTttSNG4HUDNflyIspp

hPXFlstqiHA/O/ox

WLR+MeerxZ0cNn1ja+IQAYo=

IHRn4xXOVKi477zarG+ObSy7YJA=

Xhf3e+tdAC183w==

Xk0ZAezv2rWH

kngo+vBeSRN7AszNwam3Osmguuqc0MoC

a2Qp7a+E8fSw7LDjpnqEKjsRZA==

3zjy4E7+QM48wg==

YcCmqT3OUNAigVott2pBKiy7YJA=

4+SMeX1juat/5cZ1AZihcyy7YJA=

/+m7sro0OBTl3TMpCw==

i2ctEfe4//a64yklMsgS2J90

+loZ2QKGX0UWgpvErMs=

b9BNCnJWQJS8IfsR0uR3bCy7YJA=

Signatures

  • Formbook

    Formbook is a data stealing malware which is capable of stealing data.

  • Blocklisted process makes network request 1 IoCs
  • Downloads MZ/PE file
  • Executes dropped EXE 2 IoCs
  • Checks computer location settings 2 TTPs 1 IoCs

    Looks up country code configured in the registry, likely geofence.

  • Loads dropped DLL 2 IoCs
  • Uses the VBS compiler for execution 1 TTPs
  • Suspicious use of SetThreadContext 2 IoCs
  • Enumerates system info in registry 2 TTPs 1 IoCs
  • Launches Equation Editor 1 TTPs 1 IoCs

    Equation Editor is an old Office component often targeted by exploits such as CVE-2017-11882.

  • Modifies Internet Explorer settings 1 TTPs 31 IoCs
  • Modifies registry class 64 IoCs
  • Suspicious behavior: AddClipboardFormatListener 1 IoCs
  • Suspicious behavior: EnumeratesProcesses 6 IoCs
  • Suspicious behavior: MapViewOfSection 4 IoCs
  • Suspicious use of AdjustPrivilegeToken 2 IoCs
  • Suspicious use of SetWindowsHookEx 3 IoCs
  • Suspicious use of WriteProcessMemory 18 IoCs

Processes

  • C:\Windows\Explorer.EXE
    C:\Windows\Explorer.EXE
    1⤵
    • Suspicious use of WriteProcessMemory
    PID:1284
    • C:\Program Files (x86)\Microsoft Office\Office14\EXCEL.EXE
      "C:\Program Files (x86)\Microsoft Office\Office14\EXCEL.EXE" /dde "C:\Users\Admin\AppData\Local\Temp\Transfer slip.xls"
      2⤵
      • Enumerates system info in registry
      • Modifies Internet Explorer settings
      • Modifies registry class
      • Suspicious behavior: AddClipboardFormatListener
      • Suspicious use of SetWindowsHookEx
      PID:1276
    • C:\Windows\SysWOW64\msiexec.exe
      "C:\Windows\SysWOW64\msiexec.exe"
      2⤵
      • Suspicious behavior: EnumeratesProcesses
      • Suspicious behavior: MapViewOfSection
      • Suspicious use of AdjustPrivilegeToken
      PID:1744
  • C:\Program Files (x86)\Common Files\Microsoft Shared\EQUATION\EQNEDT32.EXE
    "C:\Program Files (x86)\Common Files\Microsoft Shared\EQUATION\EQNEDT32.EXE" -Embedding
    1⤵
    • Blocklisted process makes network request
    • Loads dropped DLL
    • Launches Equation Editor
    • Suspicious use of WriteProcessMemory
    PID:520
    • C:\Users\Public\vbc.exe
      "C:\Users\Public\vbc.exe"
      2⤵
      • Executes dropped EXE
      • Suspicious use of SetThreadContext
      • Suspicious use of WriteProcessMemory
      PID:1056
      • C:\Users\Public\vbc.exe
        "C:\Users\Public\vbc.exe"
        3⤵
        • Executes dropped EXE
        • Checks computer location settings
        • Suspicious use of SetThreadContext
        • Suspicious behavior: EnumeratesProcesses
        • Suspicious behavior: MapViewOfSection
        • Suspicious use of AdjustPrivilegeToken
        PID:1344

Network

MITRE ATT&CK Enterprise v6

Replay Monitor

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Downloads

  • C:\Users\Public\vbc.exe

    Filesize

    1.1MB

    MD5

    6a48cce91cb89eb4405f9ba2c2124cd6

    SHA1

    5de7e1fd1eac0078123e4c9b63f11ce6d0527152

    SHA256

    46c11187b0eeba2ad55a36d97fc897cd2612a4cdf491405826346092af6e261e

    SHA512

    bc95a9a76dd49db6669bf9ccb2acbf23db77fd4f774eca37483768ef87b6319c8525b6acdd67ceb82fad17fcfa52f6c445367aa525775a422095a5fa20d65d34

  • C:\Users\Public\vbc.exe

    Filesize

    1.1MB

    MD5

    6a48cce91cb89eb4405f9ba2c2124cd6

    SHA1

    5de7e1fd1eac0078123e4c9b63f11ce6d0527152

    SHA256

    46c11187b0eeba2ad55a36d97fc897cd2612a4cdf491405826346092af6e261e

    SHA512

    bc95a9a76dd49db6669bf9ccb2acbf23db77fd4f774eca37483768ef87b6319c8525b6acdd67ceb82fad17fcfa52f6c445367aa525775a422095a5fa20d65d34

  • C:\Users\Public\vbc.exe

    Filesize

    1.1MB

    MD5

    6a48cce91cb89eb4405f9ba2c2124cd6

    SHA1

    5de7e1fd1eac0078123e4c9b63f11ce6d0527152

    SHA256

    46c11187b0eeba2ad55a36d97fc897cd2612a4cdf491405826346092af6e261e

    SHA512

    bc95a9a76dd49db6669bf9ccb2acbf23db77fd4f774eca37483768ef87b6319c8525b6acdd67ceb82fad17fcfa52f6c445367aa525775a422095a5fa20d65d34

  • \Users\Public\vbc.exe

    Filesize

    1.1MB

    MD5

    6a48cce91cb89eb4405f9ba2c2124cd6

    SHA1

    5de7e1fd1eac0078123e4c9b63f11ce6d0527152

    SHA256

    46c11187b0eeba2ad55a36d97fc897cd2612a4cdf491405826346092af6e261e

    SHA512

    bc95a9a76dd49db6669bf9ccb2acbf23db77fd4f774eca37483768ef87b6319c8525b6acdd67ceb82fad17fcfa52f6c445367aa525775a422095a5fa20d65d34

  • \Users\Public\vbc.exe

    Filesize

    1.1MB

    MD5

    6a48cce91cb89eb4405f9ba2c2124cd6

    SHA1

    5de7e1fd1eac0078123e4c9b63f11ce6d0527152

    SHA256

    46c11187b0eeba2ad55a36d97fc897cd2612a4cdf491405826346092af6e261e

    SHA512

    bc95a9a76dd49db6669bf9ccb2acbf23db77fd4f774eca37483768ef87b6319c8525b6acdd67ceb82fad17fcfa52f6c445367aa525775a422095a5fa20d65d34

  • memory/1056-72-0x0000000004F60000-0x0000000004FD2000-memory.dmp

    Filesize

    456KB

  • memory/1056-65-0x0000000000EB0000-0x0000000000FCA000-memory.dmp

    Filesize

    1.1MB

  • memory/1056-67-0x00000000003E0000-0x00000000003F8000-memory.dmp

    Filesize

    96KB

  • memory/1056-70-0x0000000000400000-0x000000000040C000-memory.dmp

    Filesize

    48KB

  • memory/1056-71-0x00000000058B0000-0x000000000595C000-memory.dmp

    Filesize

    688KB

  • memory/1056-62-0x0000000000000000-mapping.dmp

  • memory/1276-55-0x0000000070FD1000-0x0000000070FD3000-memory.dmp

    Filesize

    8KB

  • memory/1276-58-0x0000000074DE1000-0x0000000074DE3000-memory.dmp

    Filesize

    8KB

  • memory/1276-57-0x0000000071FBD000-0x0000000071FC8000-memory.dmp

    Filesize

    44KB

  • memory/1276-56-0x000000005FFF0000-0x0000000060000000-memory.dmp

    Filesize

    64KB

  • memory/1276-68-0x000000005FFF0000-0x0000000060000000-memory.dmp

    Filesize

    64KB

  • memory/1276-69-0x0000000071FBD000-0x0000000071FC8000-memory.dmp

    Filesize

    44KB

  • memory/1276-54-0x000000002F711000-0x000000002F714000-memory.dmp

    Filesize

    12KB

  • memory/1284-86-0x0000000006C70000-0x0000000006D87000-memory.dmp

    Filesize

    1.1MB

  • memory/1344-85-0x0000000000070000-0x0000000000080000-memory.dmp

    Filesize

    64KB

  • memory/1344-73-0x0000000000400000-0x000000000042E000-memory.dmp

    Filesize

    184KB

  • memory/1344-74-0x0000000000400000-0x000000000042E000-memory.dmp

    Filesize

    184KB

  • memory/1344-80-0x0000000000400000-0x000000000042E000-memory.dmp

    Filesize

    184KB

  • memory/1344-81-0x0000000000401000-0x000000000042E000-memory.dmp

    Filesize

    180KB

  • memory/1344-83-0x0000000000920000-0x0000000000C23000-memory.dmp

    Filesize

    3.0MB

  • memory/1344-77-0x00000000004012B0-mapping.dmp

  • memory/1344-84-0x0000000000422000-0x0000000000424000-memory.dmp

    Filesize

    8KB

  • memory/1344-76-0x0000000000400000-0x000000000042E000-memory.dmp

    Filesize

    184KB

  • memory/1344-89-0x0000000000400000-0x000000000042E000-memory.dmp

    Filesize

    184KB

  • memory/1344-88-0x0000000000401000-0x000000000042E000-memory.dmp

    Filesize

    180KB

  • memory/1744-87-0x0000000000000000-mapping.dmp

  • memory/1744-91-0x00000000009E0000-0x00000000009F4000-memory.dmp

    Filesize

    80KB

  • memory/1744-92-0x0000000000090000-0x00000000000BD000-memory.dmp

    Filesize

    180KB

  • memory/1744-93-0x0000000002130000-0x0000000002433000-memory.dmp

    Filesize

    3.0MB