Office (OOXML) / .XLSM malware analysis — malicious · 1c2d7617d35779a2

MALICIOUS

Office (OOXML) / .XLSM

796.8 KB Created: 2017-05-18 19:40:20 UTC Authoring application: Microsoft Excel 15.0300

MD5: a5fe753dfc66fe5ec89199e7f3aea8c3 SHA-1: a8e01cfe069deac906139b3bc716915e4274d873 SHA-256: 1c2d7617d35779a21a98d53e11f643b307fd964041b50b63bfcbd1495648242e

164 Risk Score

Malware Insights

MITRE ATT&CK

T1059.005 Visual Basic T1204.002 Malicious File T1071.001 Web Protocols

The sample is an XLSM file containing a Workbook_Open macro, indicating an attempt to automatically execute malicious code upon opening. The document body presents a plausible-sounding 'Time card error' lure to trick users into enabling macros. The presence of a CreateObject call and extracted VBA macros suggests the script is designed to download and execute a second-stage payload. The embedded URL is likely part of this download mechanism.

Heuristics 7

Workbook_Open macro high OLE_VBA_WBOPEN

Workbook_Open macro
CreateObject call high OLE_VBA_CREATEOBJ

CreateObject call
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 project inside OOXML medium OOXML_VBA

Document contains vbaProject.bin — VBA macros present
External hyperlinks (1) low OOXML_EXTERNAL_HYPERLINKS

Document contains 1 external hyperlink — clickable URLs are stored as external relationships. First target: https://b0d02t02.rz.ch.zurich.com/irj/portal
Hidden worksheet (hidden) low OOXML_HIDDEN_SHEET

Excel workbook contains 4 hidden sheet(s) — hidden sheets are commonly used to conceal macro code, staging data, or intermediate payload construction
Call-to-action shape / download button low OOXML_DOWNLOAD_SHAPE

Document drawing contains a call-to-action phrase ('Click Here', 'Download Now', etc.) inside a shape or text box — a common visual lure used to trick users into enabling macros or visiting a malicious URL

Extracted artifacts 2

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`macros.bas` `be4f8ef3ec30cac3a8986e5990b3d85d4e2f76f9bfe48d515d05779ac6d08ff0`	vba-macro	oletools.olevba.extract_macros (decoded VBA source from OOXML)	18235 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved macro source contains an auto-exec entry point and execution/download terms.
`vbaProject_00.bin` `3d0305eb6593bd90b4236c5266a461c86c5558aa0db4be1642c1a9c761320e0d`	vba-project	OOXML VBA project: xl/vbaProject.bin	76288 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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