Malicious Office (OOXML) / .XLSX — malware analysis report

Static analysis result for SHA-256 16e69310cd95c68f…

MALICIOUS

Office (OOXML) / .XLSX

47.4 KB Created: 2020-02-01 18:28:07 UTC Authoring application: Microsoft Excel 12.0000
MD5: c05cec48c105ea5d9a590f77291d3d51 SHA-1: 04d858e825d4900b3950c3dd7e28bbb30bfb8a6a SHA-256: 16e69310cd95c68faee48e4278b04cb5edeb243fdb7040042d89cf032968acbf
444 Risk Score

Malware Insights

MITRE ATT&CK
T1059.005 Visual Basic T1105 Ingress Tool Transfer T1204.002 Malicious File

The XLSX file contains a VBA macro with an Auto_Open subroutine that utilizes WScript.Shell to execute a command. This command, decoded from a Base64 string, downloads an executable from 'http://198.12.66.107/CanTimeoutxpJfkAK.exe' and executes it, indicating a downloader or droppper functionality.

Heuristics 12

  • Equation Editor OLE object high CVE related OLE_EQUATION_EDITOR
    Embedded OLE object xl/embeddings/oleObject3.bin contains the Equation Editor CLSID, the legacy component exploited by CVE-2017-11882, CVE-2018-0802, and CVE-2018-0798.
  • Shell() call in VBA critical OLE_VBA_SHELL
    Shell() call in VBA
  • WScript.Shell usage critical OLE_VBA_WSCRIPT
    WScript.Shell usage
  • VBA Base64-decoded Shell command stager critical OLE_VBA_BASE64_SHELL_COMMAND_STAGER
    VBA auto-exec macro decodes Base64 string literals into command or script-launch text and executes the result with Shell. This catches cmd/cscript/PowerShell/VBS launchers hidden from plain keyword matching.
  • Embedded Office object carries macros critical OFFICE_EMBEDDED_MACRO_OBJECT
    This document embeds a second Office file that itself contains a VBA macro project or an Excel 4.0 (XLM) macro sheet. Hiding a macro-bearing workbook or document inside another document — frequently under an obfuscated, non-standard part name — is a macro-smuggling technique that defeats scanners which only inspect the outer document's macro storage. No benign authoring workflow stages a hidden macro project this way.
  • Auto_Open macro high OLE_VBA_AUTO
    Auto_Open macro
  • CreateObject call high OLE_VBA_CREATEOBJ
    CreateObject call
  • VBA p-code auto-exec with execution tokens high OLE_VBA_PCODE_AUTOEXEC_EXEC
    Compiled VBA/cache stream contains an auto-execution token together with shell/download/object-execution tokens. This catches p-code-only or source-extraction-failure macro documents where visible source is unavailable.
  • VBA project inside OOXML medium OOXML_VBA
    Document contains a VBA project — VBA macros present
  • Embedded OLE object medium OOXML_OLE_OBJECT
    Document contains an embedded OLE object
  • Suspicious extracted artifact info EXTRACTED_FILE_STATIC_TRIAGE
    One or more files extracted from inside this sample matched static suspicious-content checks such as script obfuscation, encoded payload blobs, packed data, or execution/download terms.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL http://198.12.66.107/CanTimeoutxpJfkAK.exe

Extracted artifacts 9

Files carved from inside the sample during analysis.

FilenameKindSourceSize
macros.bas
2b3b7eb55a5050a234f3d6ff821b668c489d2ce56ce54647a9aaa3ac72333dfe		 vba-macro oletools.olevba.extract_macros (decoded VBA source from OOXML) 44931 bytes
Detection
ClamAV: No threats found
Obfuscation or payload: likely
Carved artifact contains 1 long base64-like blob(s).
ooxml_oleobject_00.bin
ed53cfba4460275d62d43305be97f319b562bda73b2177bdf53c4429219b5393		 ooxml-ole-object OOXML embedded OLE part: xl/embeddings/oleObject3.bin 5936 bytes
ooxml_oleobject_01.bin
ad42f9bcec245333b066b8e87c61bb3de70ad9ab48c06903fa4454956115c514		 ooxml-ole-object OOXML embedded OLE part: xl/embeddings/oleObject1.bin 3584 bytes
ooxml_oleobject_01_ole10native_00.bin
b3873bb2e38f71b3e635388edfb18d16a315d650487fd6a1fa0f478fa060bac0		 ole-package OOXML xl/embeddings/oleObject1.bin Ole10Native stream: Ole10Native 1002 bytes
ooxml_oleobject_02.bin
13f997ac62989c2186b3602cad62accdd85f619a38995b5162ce41925ec94888		 ooxml-ole-object OOXML embedded OLE part: xl/embeddings/oleObject2.bin 9216 bytes
ooxml_oleobject_02_ole10native_00.bin
225680595bcb37aecc3ff2d2c31f21188bd70bb47928ecb5efc8b6900f9c31c2		 ole-package OOXML xl/embeddings/oleObject2.bin Ole10Native stream: Ole10Native 6415 bytes
ooxml_oleobject_03.bin
8b99818ecb710e66aa93f0e01b07a44269e9d3ffc3e0e28df513ba49bedcc83e		 ooxml-ole-object OOXML embedded OLE part: xl/vbaProject.bin 72704 bytes
emf_00.emf
979dde2aed02f077c16ae53546c6df9eed40e8386d6db6fc36aee9f966d2cb82		 ooxml-emf OOXML EMF part: xl/media/image1.emf 4968 bytes
emf_01.emf
4d4d1e7b04c99dcb8e885915068ad6f74cc2333e91580cdae5ccaa00c427247f		 ooxml-emf OOXML EMF part: xl/media/image2.emf 1536 bytes

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