MalwareBazaar Database
You are currently viewing the MalwareBazaar entry for SHA256 91cf449506a9c3ade639027f6a38e99ee22d9cc7c2a1c4bc42fc8047185b8918. While MalwareBazaar tries to identify whether the sample provided is malicious or not, there is no guarantee that a sample in MalwareBazaar is malicious.
Database Entry
Formbook
Vendor detections: 12
| SHA256 hash: | 91cf449506a9c3ade639027f6a38e99ee22d9cc7c2a1c4bc42fc8047185b8918 |
|---|---|
| SHA3-384 hash: | f63ffa7e5516c5e05ee33d1ab8ca098c4235abdaaa2f16b1faa466cbc5b10779398d87c3c44b3ad7caa1f99c6901ab5e |
| SHA1 hash: | 29dcf07f9964a0c2a36defa2935441f559fe7cd2 |
| MD5 hash: | 41521b74c54998dcd1460d444b07c5f1 |
| humanhash: | foxtrot-may-mobile-papa |
| File name: | TW0091.xlsx |
| Download: | download sample |
| Signature | Formbook |
| File size: | 191'816 bytes |
| First seen: | 2022-02-11 18:02:02 UTC |
| Last seen: | Never |
| File type: |  xlsx |
| MIME type: | application/encrypted |
| ssdeep | 3072:xs2oZIfgVLTXx+gAPpQqYMednigw7WBP7ZhMCQk7AjoW9Pz1ciX:G2oegVLTAjpQqTediB7ibMCX7+p15 |
| TLSH | T13914127B7F9451F0D82722F42E66BBAC5C34FF5F68120D6D90AE3887143A196729C2A1 |
| Reporter |  abuse_ch |
| Tags: | CVE-2017-11882 FormBook VelvetSweatshop xlsx |
Office OLE Information
This malware samples appears to be an Office document. The following table provides more information about this document using oletools and oledump.
OLE dump
| Detection: VelvetSweatshop |
MalwareBazaar was able to identify 6 sections in this file using oledump:
| Section ID | Section size | Section name |
|---|---|---|
| 1 | 64 bytes | DataSpaces/DataSpaceInfo/StrongEncryptionDataSpace |
| 2 | 112 bytes | DataSpaces/DataSpaceMap |
| 3 | 208 bytes | DataSpaces/TransformInfo/StrongEncryptionTransform/Primary |
| 4 | 76 bytes | DataSpaces/Version |
| 5 | 185160 bytes | EncryptedPackage |
| 6 | 224 bytes | EncryptionInfo |
Intelligence
File Origin
# of uploads :
1
# of downloads :
337
Origin country :
n/a
Vendor Threat Intelligence
Detection:
n/a
Detection(s):
Result
Verdict:
Malware
Maliciousness:
Behaviour
Searching for the window
DNS request
Creating a window
Searching for synchronization primitives
Launching a process
Creating a file
Сreating synchronization primitives
Creating a file in the %temp% directory
Creating a file in the %AppData% subdirectories
Enabling autorun with the standard Software\Microsoft\Windows\CurrentVersion\Run registry branch
Unauthorized injection to a recently created process by context flags manipulation
Sending an HTTP GET request to an infection source by exploiting the app vulnerability
Creating a process from a recently created file
Unauthorized injection to a system process
Result
Verdict:
Malicious
File Type:
OOXML Excel File with Embedding Objects in Encrypted Excel File
Document image
Image:
Verdict:
Malicious
Threat level:
10/10
Confidence:
100%
Tags:
control.exe embedequation exploit shell32.dll shellcode VelvetSweatshop
Label:
Malicious
Suspicious Score:
9.8/10
Score Malicious:
99%
Score Benign:
1%
Result
Verdict:
MALICIOUS
Link:
Details
Macro Execution Coercion
Detected a document that appears to social engineer the user into activating embedded logic.
Document With No Content
Document contains little or no semantic information.
Result
Threat name:
FormBook
Detection:
malicious
Classification:
troj.expl.evad
Score:
100 / 100
Signature
Antivirus detection for URL or domain
C2 URLs / IPs found in malware configuration
Drops PE files to the user root directory
Found evasive API chain (may stop execution after reading information in the PEB, e.g. number of processors)
Found malware configuration
Injects a PE file into a foreign processes
Machine Learning detection for dropped file
Malicious sample detected (through community Yara rule)
Maps a DLL or memory area into another process
Modifies the context of a thread in another process (thread injection)
Multi AV Scanner detection for submitted file
Office document tries to convince victim to disable security protection (e.g. to enable ActiveX or Macros)
Office equation editor drops PE file
Office equation editor starts processes (likely CVE 2017-11882 or CVE-2018-0802)
Queues an APC in another process (thread injection)
Sample uses process hollowing technique
Sigma detected: Droppers Exploiting CVE-2017-11882
Sigma detected: EQNEDT32.EXE connecting to internet
Sigma detected: Execution from Suspicious Folder
Sigma detected: File Dropped By EQNEDT32EXE
Snort IDS alert for network traffic (e.g. based on Emerging Threat rules)
System process connects to network (likely due to code injection or exploit)
Tries to detect virtualization through RDTSC time measurements
Yara detected FormBook
Behaviour
Behavior Graph:
Detection:
formbook
Threat name:
Document-OLE.Exploit.CVE-2017-11882
Status:
Malicious
First seen:
2022-02-11 16:14:16 UTC
File Type:
Document
Extracted files:
51
AV detection:
17 of 43 (39.53%)
Threat level:
5/5
Detection(s):
Suspicious file
Result
Malware family:
xloader
Score:
10/10
Tags:
family:formbook family:xloader campaign:b80i loader persistence rat spyware stealer suricata trojan
Behaviour
Checks processor information in registry
Enumerates system info in registry
Launches Equation Editor
Modifies Internet Explorer settings
Modifies registry class
Suspicious behavior: AddClipboardFormatListener
Suspicious behavior: EnumeratesProcesses
Suspicious behavior: GetForegroundWindowSpam
Suspicious behavior: MapViewOfSection
Suspicious use of AdjustPrivilegeToken
Suspicious use of FindShellTrayWindow
Suspicious use of SendNotifyMessage
Suspicious use of SetWindowsHookEx
Suspicious use of WriteProcessMemory
NSIS installer
Enumerates physical storage devices
Drops file in Windows directory
Suspicious use of SetThreadContext
Adds Run key to start application
Loads dropped DLL
Uses the VBS compiler for execution
Blocklisted process makes network request
Downloads MZ/PE file
Executes dropped EXE
Xloader Payload
Formbook
Xloader
suricata: ET MALWARE FormBook CnC Checkin (GET)
Malware family:
XLoader
Verdict:
Malicious
Please note that we are no longer able to provide a coverage score for Virus Total.
File information
The table below shows additional information about this malware sample such as delivery method and external references.
Malspam
Delivery method
Distributed via e-mail attachment
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