RogueRobin Office (OOXML) / .XLSX malware analysis — malicious · 4e40f80114e5bd44

MALICIOUS

Office (OOXML) / .XLSX

37.7 KB Created: 2006-09-16 00:00:00 UTC Authoring application: Microsoft Excel 15.0300

MD5: 89e50d52e498c34f1e976cf9a1017a39 SHA-1: 1b8fe1d2194e685c0cce2f00c33e7f069f3a4d54 SHA-256: 4e40f80114e5bd44a762f6066a3e56ccdc0d01ab2a18397ea12e0bc5508215b8

440 Risk Score

Malware Insights

RogueRobin · confidence 95%

MITRE ATT&CK

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

The file is an Excel document containing VBA macros, specifically a Workbook_Open macro. This macro utilizes WScript.Shell and CreateObject to execute a PowerShell command. ClamAV signatures identify this as Doc.Dropper.RogueRobin-6826034-0, indicating a dropper functionality. The primary function appears to be downloading and executing a secondary payload.

Heuristics 9

Shell() call in VBA critical OLE_VBA_SHELL

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

WScript.Shell usage
PowerShell reference in VBA critical OLE_VBA_PS

PowerShell reference in VBA
ClamAV: Doc.Dropper.RogueRobin-6826034-0 critical CLAMAV_DETECTION

ClamAV detected this file as malware: Doc.Dropper.RogueRobin-6826034-0
ClamAV detection on extracted artifact critical EXTRACTED_FILE_CLAMAV

ClamAV flagged at least one file extracted from inside this sample. Even when the wrapping document carries no AV detection of its own, a hit on the carved artifact is a strong indicator the sample is a delivery vehicle.
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

Extracted artifacts 2

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`macros.bas` `ee6e8e8eef404cd933140057b54377351ffefb92fc18f5367262f005f741cd01`	vba-macro	oletools.olevba.extract_macros (decoded VBA source from OOXML)	24313 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 11 shell/COM execution token(s). Carved macro source contains an auto-exec entry point and execution/download terms.
`vbaProject_00.bin` `0743510b8a2d6840ab4a46324ed8a42b29db5729e93b0c6d343a8199e6419ba0`	vba-project	OOXML VBA project: xl/vbaProject.bin	62464 bytes
Detection ClamAV: Doc.Dropper.RogueRobin-6826034-0 Obfuscation or payload: likely Carved artifact contains 7 shell/COM execution token(s). Carved macro source contains an auto-exec entry point and execution/download terms.

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