Office (OLE) / .XLSX malware analysis — malicious · b7b52740ab7393c2

MALICIOUS

Office (OLE) / .XLSX

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

MD5: 11cb6ef005df7aade697484f15b34e3d SHA-1: 01e9a614f948a947e6de6dfd87d468827dedd6f3 SHA-256: b7b52740ab7393c2fda18f0a08e05b7f1700d208b488eedb8ed45963dd5d521b

340 Risk Score

Malware Insights

MITRE ATT&CK

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

The sample is an Excel file containing VBA macros, specifically a Workbook_Open macro that utilizes a Shell() call. This indicates the macro is designed to execute external commands upon opening. The presence of 'wscript' and 'CreateObject' heuristics further supports the execution of scripts. The extracted artifact 'macros.bas' likely contains the malicious script. The ClamAV detection 'Xls.Packed.Logan-9738662-0' confirms its malicious nature. The primary attack vector is likely the execution of a second-stage payload via the VBA macro.

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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