Office (OLE) / .XLSX malware analysis — malicious · d6bff2765500205e

MALICIOUS

Office (OLE) / .XLSX

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

MD5: 2647464eaee1202a0255a0cad239acfe SHA-1: d3dd12dc9c7a22fa95300658349cd9be5c79bd56 SHA-256: d6bff2765500205e1f3127c7d7e8038ccfb9f24c816fe581ff4a09382a83243e

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 auto-execution routine, which is designed to call the Shell() function. This indicates the macro is intended to execute an external command or program. The presence of 'wscript' and 'CreateObject' calls further supports the execution of scripts. While no specific URLs were extracted, the embedded artifacts 'macros.bas' and 'ole10native_00.bin' are likely components of the malicious payload.

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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