Office (OLE) / .XLS malware analysis — malicious · 852b0e00fffa2673

MALICIOUS

Office (OLE) / .XLS

14.5 KB

MD5: c1fc97663742fb51f8be7fa95251b2c4 SHA-1: abc180cbe2cf3ec3c3c35897fd005db8263b94c4 SHA-256: 852b0e00fffa2673394117b6deea5f2d6cd7e4ef64fbc50e2e13b0aef9ba39a2

260 Risk Score

Malware Insights

MITRE ATT&CK

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

The file contains VBA macros, specifically a Workbook_Open macro, which is designed to execute arbitrary commands. The critical heuristic 'OLE_VBA_ASC_CHR_SHIFT_SHELL' indicates that a Shell() command is being obfuscated using character-shifting techniques, a common method for downloading and executing further malicious content. The presence of a Workbook_Open macro and the use of Shell() strongly suggest a downloader or initial execution stage for a more complex attack.

Heuristics 6

Shell() call in VBA critical OLE_VBA_SHELL

Shell() call in VBA
VBA character-shift decoded Shell command critical OLE_VBA_ASC_CHR_SHIFT_SHELL

VBA auto-exec macro stores an encoded command string, decodes it with a Mid/Asc/Chr character-shift loop, and passes the recovered text to Shell. This is a high-confidence command stager.
Workbook_Open macro high OLE_VBA_WBOPEN

Workbook_Open macro
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` `b86f199b0d8b15050e6981aa04fad61597b521455ad46e0017d03915090c4d1b`	vba-macro	oletools.olevba.extract_macros (decoded VBA source)	2090 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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