Malicious Office (OLE) — malware analysis report

Static analysis result for SHA-256 aa3985a49bf43a17…

MALICIOUS

Office (OLE)

312.5 KB Created: 2000-05-15 12:34:00 Authoring application: Microsoft Word 8.0 First seen: 2012-06-14
MD5: 3db54d26c3c2eb016c8cf365d8fb4577 SHA-1: 4a7465bda15e66977f7d1eb3992558864de7b429 SHA-256: aa3985a49bf43a17ecb1bc52f1973cf498bbf1d1ef02c3c12102c3da18f464e5
280 Risk Score

Malware Insights

MITRE ATT&CK
T1059.005 Visual Basic T1566.001 Spearphishing Attachment

The sample is a malicious Word document containing legacy WordBasic and VBA macros, indicated by multiple high-severity heuristic firings including OLE_VBA_AUTOOPEN and OLE_VBA_DOCOPEN. The presence of these auto-executing macros suggests the document is designed to run arbitrary code when opened, a common technique for delivering secondary payloads. The ClamAV detection further confirms its malicious nature.

Heuristics 6

  • ClamAV: Doc.Trojan.Ostrich-1 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Doc.Trojan.Ostrich-1
  • VBA macros detected medium 3 related findings OLE_VBA_MACROS
    Document contains VBA macro code
  • AutoOpen macro high OLE_VBA_AUTOOPEN
    AutoOpen macro
  • Document_Open macro high OLE_VBA_DOCOPEN
    Document_Open macro
  • Auto_Close macro high OLE_VBA_AUTOCLOSE
    Auto_Close macro
  • Legacy WordBasic auto-exec macro marker medium OLE_LEGACY_WORDBASIC_AUTOEXEC
    OLE Word document contains a legacy WordBasic auto-execution marker such as AutoOpen, but no modern VBA project was recovered and no stronger macro-virus family marker was present. This is analyst-facing evidence for old Word macro execution surface, not a downloader or parser-CVE attribution by itself.

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
macros.bas vba-macro oletools.olevba.extract_macros (decoded VBA source) 297635 bytes
SHA-256: 2313d888189c21aad4612a9e12fd443414e2235d10427fca5ee464c8a95cbc2b
Detection
ClamAV: Doc.Trojan.Ostrich-1
Obfuscation or payload: unlikely
Preview script
First 1,000 lines of the extracted script
Attribute VB_Name = "ThisDocument"
Attribute VB_Base = "0{00020906-0000-0000-C000-000000000046}"
Attribute VB_Creatable = False
Attribute VB_PredeclaredId = True
Attribute VB_Exposed = True
Attribute VB_TemplateDerived = False
Attribute VB_Customizable = True
Option Explicit


Attribute VB_Name = "FormDatum"
Attribute VB_Base = "0{8E72201B-2A6E-11D4-BF88-96BA40BAB626}{8E721FCC-2A6E-11D4-BF88-96BA40BAB626}"
Attribute VB_Creatable = False
Attribute VB_PredeclaredId = True
Attribute VB_Exposed = False
Attribute VB_TemplateDerived = False
Attribute VB_Customizable = False

Option Explicit
Dim Abbruch As Boolean
Private Sub CommandButton2_Click()
 Abbruch = False
 Unload Me
End Sub
Private Sub CommandButton3_Click()
 Unload Me
End Sub
Private Sub OptionButton1_Change()
 Dat_Datum.Tag = 1
End Sub
Private Sub OptionButton2_Change()
 Dat_Datum.Tag = 2
End Sub
Private Sub OptionButton3_Change()
 Dat_Datum.Tag = 3
End Sub
Private Sub OptionButton4_Change()
 Dat_Datum.Tag = 4
End Sub
Private Sub OptionButton5_Change()
 Dat_Datum.Tag = 5
End Sub
Private Sub OptionButton6_Change()
 Dat_Datum.Tag = 6
End Sub
Private Sub OptionButton7_Change()
 Dat_Datum.Tag = 7
End Sub
Private Sub OptionButton8_Change()
 Dat_Datum.Tag = 8
End Sub
Private Sub OptionButton9_Change()
 Dat_Datum.Tag = 9
End Sub
Private Sub OptionButton10_Change()
 Dat_Datum.Tag = 10
End Sub
Private Sub OptionButton11_Change()
 Dat_Datum.Tag = 11
End Sub
Private Sub OptionButton12_Change()
 Dat_Datum.Tag = 12
End Sub
Private Sub OptionButton13_Change()
 Dat_Datum.Tag = 13
End Sub
Private Sub OptionButton14_Change()
 Dat_Datum.Tag = 14
End Sub
Private Sub OptionButton15_Change()
 Dat_Datum.Tag = 15
End Sub
Private Sub OptionButton16_Change()
 Dat_Datum.Tag = 16
End Sub
Private Sub OptionButton17_Change()
 Dat_Datum.Tag = 17
End Sub
Private Sub OptionButton18_Change()
 Dat_Datum.Tag = 18
End Sub
Private Sub OptionButton19_Change()
 Dat_Datum.Tag = 19
End Sub
Private Sub OptionButton20_Change()
 Dat_Datum.Tag = 20
End Sub
Private Sub OptionButton21_Change()
 Dat_Datum.Tag = 21
End Sub
Private Sub OptionButton22_Change()
 Dat_Datum.Tag = 22
End Sub
Private Sub OptionButton23_Change()
 Dat_Datum.Tag = 23
End Sub
Private Sub OptionButton24_Change()
 Dat_Datum.Tag = 24
End Sub
Private Sub OptionButton25_Change()
 Dat_Datum.Tag = 25
End Sub
Private Sub OptionButton26_Change()
 Dat_Datum.Tag = 26
End Sub
Private Sub OptionButton27_Change()
 Dat_Datum.Tag = 27
End Sub
Private Sub OptionButton28_Change()
 Dat_Datum.Tag = 28
End Sub
Private Sub OptionButton30_Change()
 Dat_Datum.Tag = 30
End Sub
Private Sub OptionButton31_Change()
 Dat_Datum.Tag = 31
End Sub
Private Sub OptionButton32_Change()
 If OptionButton32 Then OptionButton48.Enabled = False Else: OptionButton48.Enabled = True
 Dat_Datum.JedenTag = OptionButton32.Value
End Sub
Private Sub OptionButton36_Click()
 Dat_Datum.Monat = 1: SetMaxTage
End Sub
Private Sub OptionButton37_Click()
 Dat_Datum.Monat = 2: SetMaxTage
End Sub
Private Sub OptionButton38_Click()
 Dat_Datum.Monat = 3: SetMaxTage
End Sub
Private Sub OptionButton39_Click()
 Dat_Datum.Monat = 4: SetMaxTage
End Sub
Private Sub OptionButton40_Click()
 Dat_Datum.Monat = 5: SetMaxTage
End Sub
Private Sub OptionButton41_Click()
 Dat_Datum.Monat = 6: SetMaxTage
End Sub
Private Sub OptionButton42_Click()
 Dat_Datum.Monat = 7: SetMaxTage
End Sub
Private Sub OptionButton43_Click()
 Dat_Datum.Monat = 8: SetMaxTage
End Sub
Private Sub OptionButton44_Click()
 Dat_Datum.Monat = 9: SetMaxTage
End Sub
Private Sub OptionButton45_Click()
 Dat_Datum.Monat = 10: SetMaxTage
End Sub
Private Sub OptionButton46_Click()
 Dat_Datum.Monat = 11: SetMaxTage
End Sub
Private Sub OptionButton47_Click()
 Dat_Datum.Monat = 12: SetMaxTage
End Sub
Private Sub OptionButton48_Change()
 If OptionButton48 Then OptionButton32.Enabled = False Else: OptionButton32.Enabled = True
 Dat_Datum.JedenMonat = OptionButton48.Value
End Sub
Private Sub SetMonat(
... (truncated)

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