Office (OLE) / .XLSX malware analysis — malicious · ec873c6e1471c6bc

MALICIOUS

Office (OLE) / .XLSX

679.0 KB Created: 2020-06-22 10:41:03 Authoring application: Microsoft Excel

MD5: c3e0735357d100be8a05de77a8816a6c SHA-1: 2e05ab5d50496c3a5ff8a679a33efa20bd1b4475 SHA-256: ec873c6e1471c6bcd75925b97f996ca6dda3fb22c58a8d4fe8cec4cee8425073

340 Risk Score

Malware Insights

MITRE ATT&CK

T1059.005 Visual Basic T1059.001 PowerShell T1204.002 Malicious File

The file contains VBA macros, specifically a Workbook_Open macro that utilizes Shell() and CreateObject() calls. This indicates an attempt to execute arbitrary code upon opening the document. The presence of 'wscript' references and the ClamAV detection as 'Xls.Packed.Logan-9738662-0' strongly suggest malicious intent. The extracted artifacts 'macros.bas' and 'ole10native_00.bin' are likely components of the malicious payload delivery mechanism.

Heuristics 8

Shell() call in VBA critical OLE_VBA_SHELL

Shell() call in VBA
ClamAV: Xls.Packed.Logan-9738662-0 critical CLAMAV_DETECTION

ClamAV detected this file as malware: Xls.Packed.Logan-9738662-0
Reference to Windows Script Host high SC_STR_WSCRIPT

Reference to Windows Script Host
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

Extracted artifacts 2

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`macros.bas` `c002a21b25eb16c7cf03a813431739fc85b8749f5f8d813ff87921f514f0b8e4`	vba-macro	oletools.olevba.extract_macros (decoded VBA source)	22654 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` `50bbdd9fbbbbfb058d8ce90c36c6dd737df05c51155ec25e62815722e58296e1`	ole-package	OLE Ole10Native stream: MBD00356439/Ole10Native	439791 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact entropy is 7.98, consistent with packed or encrypted content.

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