Office (OLE) / .XLSX malware analysis — malicious · 891777e74d9c8f3e

MALICIOUS

Office (OLE) / .XLSX

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

MD5: 50f650ca60befa72ec35569483e16773 SHA-1: 2b024d6638e5709f8d586c77027ee18385fed5af SHA-256: 891777e74d9c8f3e27e82ea7618395e1c30bcaa87a28a15ceb263131ef71d539

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, which is designed to execute code upon opening. The critical OLE_VBA_SHELL heuristic indicates the use of the Shell() function, commonly employed to launch external processes or download additional payloads. The presence of 'wscript' and 'CreateObject' calls further supports the execution of scripts or external tools. While no specific URLs were extracted, the 'macros.bas' and 'ole10native_00.bin' artifacts are suspicious and likely contain the malicious code.

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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