Office (OLE) / .XLSX malware analysis — malicious · a3c020bf50d39a58

MALICIOUS

Office (OLE) / .XLSX

1.36 MB Created: 2020-02-07 11:26:50 Authoring application: Microsoft Excel

MD5: f23dd9acbf28f324b290b970fbc40b30 SHA-1: fa2d17a1675ae8ea0c44a8a06376fe0c6267b7a5 SHA-256: a3c020bf50d39a58f5345b671c43d790cba0e2a3f631c5182437976adf970633

388 Risk Score

Malware Insights

MITRE ATT&CK

T1059.005 Visual Basic T1059.001 PowerShell T1105 Ingress Tool Transfer

The critical OLE_VBA_SHELL and OLE_VBA_PCODE_AUTOEXEC_EXEC heuristics indicate that the Workbook_Open macro is designed to execute arbitrary code. This code likely leverages CreateObject and LoadLibrary/GetProcAddress to run the embedded PE executable, which is a common technique for delivering second-stage payloads. The presence of an embedded executable strongly suggests a downloader or dropper functionality.

Heuristics 10

Shell() call in VBA critical OLE_VBA_SHELL

Shell() call in VBA
Embedded PE executable critical OLE_EMBEDDED_EXE

MZ/PE header found inside document — possible embedded executable
Reference to LoadLibrary API high SC_STR_LOADLIBRARY

Reference to LoadLibrary API
Reference to GetProcAddress API high SC_STR_GETPROCADDRESS

Reference to GetProcAddress API
Workbook_Open macro high OLE_VBA_WBOPEN

Workbook_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.
Suspicious extracted artifact high 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.
VBA macros detected medium OLE_VBA_MACROS

Document contains VBA macro code
Environ() call (env variable access) low OLE_VBA_ENVIRON

Environ() call (env variable access)

Extracted artifacts 3

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`macros.bas` `fd33eb39e6cdaba21e08b3cb7ad42f38c7e0fe913ced164adb5f34a8d1465bb7`	vba-macro	oletools.olevba.extract_macros (decoded VBA source)	2911 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved macro source contains an auto-exec entry point and execution/download terms.
`embedded_office_00000a6a.exe` `fe69674c2e4aa34a89a9f0744a60f0a904fd5bd886a15e3793055cdd0c9bde6b`	embedded-pe	Office MZ+PE at offset 0xA6A	1422742 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved macro source contains an auto-exec entry point and execution/download terms.
`ole10native_00.bin` `3acca7370546fbb1dc084c2a4af4eaed4516596b28e91185883b5e51cb362edc`	ole-package	OLE Ole10Native stream: MBD010F1B0C/Ole10Native	71968 bytes

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