Office (OLE) / .XLS malware analysis — malicious · e6bf59215f08c9ef

MALICIOUS

Office (OLE) / .XLS

1.33 MB Created: 2016-04-08 13:33:00 Authoring application: Microsoft Excel

MD5: 4cd4c28554ae17565db084be98ebd645 SHA-1: 5f461680f64cfb5993941631b9ac7b6806378a96 SHA-256: e6bf59215f08c9efddf4838042f75670b19446336c8b35bcc4d3015f17c15f89

420 Risk Score

Malware Insights

MITRE ATT&CK

T1059.005 Visual Basic T1059.003 Windows Command Shell T1204.002 Malicious File

The file is an Excel spreadsheet containing VBA macros, specifically a Workbook_Open macro that utilizes Shell() and CreateObject() calls, indicative of malicious intent. The presence of the SE_PASSWORD_ARCHIVE_LURE heuristic suggests the document's purpose is to deceive users into providing a password for an archive, likely to evade security measures. The macros likely download and execute a second-stage payload, though the exact mechanism is obscured.

Heuristics 10

Shell() call in VBA critical OLE_VBA_SHELL

Shell() call in VBA
WScript.Shell usage critical OLE_VBA_WSCRIPT

WScript.Shell usage
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
GetObject call high OLE_VBA_GETOBJ

GetObject 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.

URL http://www.frez.co.uk
Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE

Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
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.

URL http://www.frez.co.uk
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` `d7fa021f8b26fb1d34e52218d97bfa643390ede2f24feed496ab8663e9cded7c`	vba-macro	oletools.olevba.extract_macros (decoded VBA source)	1499882 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 4 shell/COM execution token(s). Carved artifact contains 2 eval/decoder/string-building token(s). Carved artifact contains 62 Chr/ChrW string-construction calls. Carved macro source contains an auto-exec entry point and execution/download terms.

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