Office (OLE) malware analysis — malicious · c45800ddb385827a

MALICIOUS

Office (OLE)

480.0 KB Created: 1999-03-20 22:11:47 Authoring application: Microsoft Excel First seen: 2012-06-14

MD5: 46a53de5a1acab7016b7ad8b484a745a SHA-1: e7e1f4123d62ccd6a91e3de2acc4e11b9caa59be SHA-256: c45800ddb385827a23ee01bb07a1856a77c894806e600688dd301edcad94f18b

320 Risk Score

Malware Insights

MITRE ATT&CK

T1059.005 Visual Basic T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The file is an Excel spreadsheet containing VBA macros, including Auto_Open and Auto_Close functions. Critical heuristics indicate the use of the Shell() function within these macros, which is a strong indicator of malicious intent to execute arbitrary code. The ClamAV detection of 'Xls.Trojan.Hongo-1' further confirms its malicious nature. The macro's likely purpose is to download and execute a second-stage payload, consistent with common malware delivery techniques.

Heuristics 6

ClamAV: Xls.Trojan.Hongo-1 critical CLAMAV_DETECTION

ClamAV detected this file as malware: Xls.Trojan.Hongo-1
VBA macros detected medium 4 related findings OLE_VBA_MACROS

Document contains VBA macro code
Shell() call in VBA critical OLE_VBA_SHELL

Shell() call in VBA
Auto_Open macro high OLE_VBA_AUTO

Auto_Open macro
Auto_Close macro high OLE_VBA_AUTOCLOSE

Auto_Close 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.

Extracted artifacts 1

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`macros.bas`	vba-macro	oletools.olevba.extract_macros (decoded VBA source)	36059 bytes
SHA-256: `931201ef5071c033f504f7e7c6ff324d01600f013f1d005c1d9b6281bd661028`
Detection ClamAV: Xls.Trojan.Hongo-1 Obfuscation or payload: unlikely
Preview script First 1,000 lines of the extracted script Attribute VB_Name = "EsteLibro" Attribute VB_Base = "0{00020819-0000-0000-C000-000000000046}" Attribute VB_Creatable = False Attribute VB_PredeclaredId = True Attribute VB_Exposed = True Attribute VB_TemplateDerived = False Attribute VB_Customizable = True Attribute VB_Name = "Hoja1" Attribute VB_Base = "0{00020820-0000-0000-C000-000000000046}" Attribute VB_Creatable = False Attribute VB_PredeclaredId = True Attribute VB_Exposed = True Attribute VB_TemplateDerived = False Attribute VB_Customizable = True Attribute VB_Name = "Hoja2" Attribute VB_Base = "0{00020820-0000-0000-C000-000000000046}" Attribute VB_Creatable = False Attribute VB_PredeclaredId = True Attribute VB_Exposed = True Attribute VB_TemplateDerived = False Attribute VB_Customizable = True Attribute VB_Name = "Hoja3" Attribute VB_Base = "0{00020820-0000-0000-C000-000000000046}" Attribute VB_Creatable = False Attribute VB_PredeclaredId = True Attribute VB_Exposed = True Attribute VB_TemplateDerived = False Attribute VB_Customizable = True Attribute VB_Name = "Hoja4" Attribute VB_Base = "0{00020820-0000-0000-C000-000000000046}" Attribute VB_Creatable = False Attribute VB_PredeclaredId = True Attribute VB_Exposed = True Attribute VB_TemplateDerived = False Attribute VB_Customizable = True Attribute VB_Name = "Hoja5" Attribute VB_Base = "0{00020820-0000-0000-C000-000000000046}" Attribute VB_Creatable = False Attribute VB_PredeclaredId = True Attribute VB_Exposed = True Attribute VB_TemplateDerived = False Attribute VB_Customizable = True Attribute VB_Name = "Hoja6" Attribute VB_Base = "0{00020820-0000-0000-C000-000000000046}" Attribute VB_Creatable = False Attribute VB_PredeclaredId = True Attribute VB_Exposed = True Attribute VB_TemplateDerived = False Attribute VB_Customizable = True Attribute VB_Name = "Hoja7" Attribute VB_Base = "0{00020820-0000-0000-C000-000000000046}" Attribute VB_Creatable = False Attribute VB_PredeclaredId = True Attribute VB_Exposed = True Attribute VB_TemplateDerived = False Attribute VB_Customizable = True Attribute VB_Name = "Hoja8" Attribute VB_Base = "0{00020820-0000-0000-C000-000000000046}" Attribute VB_Creatable = False Attribute VB_PredeclaredId = True Attribute VB_Exposed = True Attribute VB_TemplateDerived = False Attribute VB_Customizable = True Attribute VB_Name = "Hoja9" Attribute VB_Base = "0{00020820-0000-0000-C000-000000000046}" Attribute VB_Creatable = False Attribute VB_PredeclaredId = True Attribute VB_Exposed = True Attribute VB_TemplateDerived = False Attribute VB_Customizable = True Attribute VB_Name = "Hoja10" Attribute VB_Base = "0{00020820-0000-0000-C000-000000000046}" Attribute VB_Creatable = False Attribute VB_PredeclaredId = True Attribute VB_Exposed = True Attribute VB_TemplateDerived = False Attribute VB_Customizable = True Attribute VB_Name = "Hoja11" Attribute VB_Base = "0{00020820-0000-0000-C000-000000000046}" Attribute VB_Creatable = False Attribute VB_PredeclaredId = True Attribute VB_Exposed = True Attribute VB_TemplateDerived = False Attribute VB_Customizable = True Attribute VB_Name = "Hoja12" Attribute VB_Base = "0{00020820-0000-0000-C000-000000000046}" Attribute VB_Creatable = False Attribute VB_PredeclaredId = True Attribute VB_Exposed = True Attribute VB_TemplateDerived = False Attribute VB_Customizable = True Attribute VB_Name = "Hoja13" Attribute VB_Base = "0{00020820-0000-0000-C000-000000000046}" Attribute VB_Creatable = False Attribute VB_PredeclaredId = True Attribute VB_Exposed = True Attribute VB_TemplateDerived = False Attribute VB_Customizable = True Attribute VB_Name = "Hoja14" Attribute VB_Base = "0{00020820-0000-0000-C000-000000000046}" Attribute VB_Creatable = False Attribute VB_PredeclaredId = True Attribute VB_Exposed = True Attribute VB_TemplateDerived = False Attribute VB_Customizable = True Attribute VB_Name = "Hoja15" Attribute VB_Base = "0{00020820-0000-0000-C000-000000000046}" Attribute VB_Creatable = False Attribute VB_PredeclaredId = True Attribute VB ... (truncated)

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