MalwareBazaar Database
You are currently viewing the MalwareBazaar entry for SHA256 66cb83b03a810acbd9b08071efcfb055b272da2df721695fc22624c6bb6cadd6. 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: 16
| SHA256 hash: | 66cb83b03a810acbd9b08071efcfb055b272da2df721695fc22624c6bb6cadd6 |
|---|---|
| SHA3-384 hash: | b1f4d123f5a5f1f16b9b4643058aa27ef26f5756e7aebac4ab95c59027fb8c7c1b5e8bb23510c74948654b8f356dad89 |
| SHA1 hash: | 925aef2b8e7666f04fb06c2de30aae3445ee929f |
| MD5 hash: | b3c87476205dddb0116e65ea556c0162 |
| humanhash: | two-high-sweet-oxygen |
| File name: | rReferenceNotice_pdf.exe |
| Download: | download sample |
| Signature | Formbook |
| File size: | 255'086 bytes |
| First seen: | 2023-03-21 13:08:36 UTC |
| Last seen: | 2023-03-21 13:20:09 UTC |
| File type: |  exe |
| MIME type: | application/x-dosexec |
| imphash | 61259b55b8912888e90f516ca08dc514 (1'059 x Formbook, 741 x AgentTesla, 431 x GuLoader) |
| ssdeep | 6144:PYa6BCwFRtYQ88xkN8Q1UMbyBloNkxF5UDn+oNZdTM5:PYrrLtJ8I4xpNkxF5kn+IPA5 |
| Threatray | 2'451 similar samples on MalwareBazaar |
| TLSH | T13844123837F0E053D82353711DBADB192971E7222C6197AB37A06E1A3E62255DD0F35B |
| TrID | 47.3% (.EXE) Win32 Executable MS Visual C++ (generic) (31206/45/13) 15.9% (.EXE) Win64 Executable (generic) (10523/12/4) 9.9% (.DLL) Win32 Dynamic Link Library (generic) (6578/25/2) 7.6% (.EXE) Win16 NE executable (generic) (5038/12/1) 6.8% (.EXE) Win32 Executable (generic) (4505/5/1) |
| File icon (PE): |  |
| dhash icon | b2a89c96a2cada72 (2'283 x Formbook, 981 x Loki, 803 x AgentTesla) |
| Reporter |  FXOLabs |
| Tags: | exe FormBook |
Intelligence
File Origin
# of uploads :
2
# of downloads :
244
Origin country :
n/a
Vendor Threat Intelligence
Malware family:
formbook
ID:
1
File name:
rReferenceNotice_pdf.exe
Verdict:
Malicious activity
Analysis date:
2023-03-21 13:10:40 UTC
Tags:
formbook trojan stealer
Note:
ANY.RUN is an interactive sandbox that analyzes all user actions rather than an uploaded sample
Detection:
Formbook
Result
Verdict:
Malware
Maliciousness:
Behaviour
Searching for the window
Creating a file in the %temp% directory
Creating a window
Creating a process from a recently created file
Сreating synchronization primitives
Searching for synchronization primitives
Launching a process
DNS request
Sending an HTTP GET request
Reading critical registry keys
Launching the default Windows debugger (dwwin.exe)
Unauthorized injection to a recently created process
Unauthorized injection to a recently created process by context flags manipulation
Stealing user critical data
Unauthorized injection to a system process
Verdict:
Malicious
Threat level:
10/10
Confidence:
100%
Tags:
comodo formbook nemesis overlay packed remcos shell32.dll
Verdict:
Malicious
Labled as:
Win/malicious_confidence_100%
Result
Verdict:
MALICIOUS
Details
Windows PE Executable
Found a Windows Portable Executable (PE) binary. Depending on context, the presence of a binary is suspicious or malicious.
Malware family:
Formbook
Verdict:
Malicious
Result
Threat name:
FormBook
Detection:
malicious
Classification:
troj.spyw.evad
Score:
100 / 100
Signature
Antivirus detection for URL or domain
Detected unpacking (changes PE section rights)
Initial sample is a PE file and has a suspicious name
Machine Learning detection for sample
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 dropped file
Multi AV Scanner detection for submitted file
Queues an APC in another process (thread injection)
Sample uses process hollowing technique
Snort IDS alert for network traffic
System process connects to network (likely due to code injection or exploit)
Tries to harvest and steal browser information (history, passwords, etc)
Tries to steal Mail credentials (via file / registry access)
Yara detected FormBook
Behaviour
Behavior Graph:
Threat name:
Win32.Trojan.Leonem
Status:
Malicious
First seen:
2023-03-21 00:43:06 UTC
File Type:
PE (Exe)
Extracted files:
3
AV detection:
21 of 24 (87.50%)
Threat level:
5/5
Detection(s):
Malicious file
Verdict:
malicious
Label(s):
formbook
Similar samples:
+ 2'441 additional samples on MalwareBazaar
Result
Malware family:
n/a
Score:
7/10
Tags:
n/a
Behaviour
Modifies Internet Explorer settings
Modifies registry class
Suspicious behavior: EnumeratesProcesses
Suspicious behavior: GetForegroundWindowSpam
Suspicious behavior: MapViewOfSection
Suspicious use of AdjustPrivilegeToken
Suspicious use of FindShellTrayWindow
Suspicious use of SendNotifyMessage
Suspicious use of WriteProcessMemory
Enumerates physical storage devices
Program crash
Suspicious use of SetThreadContext
Checks computer location settings
Executes dropped EXE
Loads dropped DLL
Unpacked files
SH256 hash:
70087257272db93cc3ee229694c3edb9ff192b0f66884801519b6e64f8b9ba7a
MD5 hash:
39a60cff62832e8d0c8647e25e57052b
SHA1 hash:
93bac0e563e4844fdc7d4b596b50056eb2a05d1d
Detections:
win_formbook_w0
win_formbook_auto
win_formbook_g0
Parent samples :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 hash:
ddaeba256d72a04cb802b76fc847815a819e204edc6591e40a7fd0e772716b35
MD5 hash:
a3a676918150b352c2103c2d7dc503fa
SHA1 hash:
fde1c6735e65420f602dd8053c915a37424a5cf2
SH256 hash:
35971233cff0596e4e6ea657d261997489ae8618fbcf26ef0e8cd9ddd136f8f5
MD5 hash:
06dd25cc9b757db9772d566b1143628d
SHA1 hash:
1b5931912fe626e89d1b55fa10ef9ef6d66b6539
SH256 hash:
66cb83b03a810acbd9b08071efcfb055b272da2df721695fc22624c6bb6cadd6
MD5 hash:
b3c87476205dddb0116e65ea556c0162
SHA1 hash:
925aef2b8e7666f04fb06c2de30aae3445ee929f
Malware family:
XLoader
Verdict:
Malicious
Please note that we are no longer able to provide a coverage score for Virus Total.
Threat name:
Malicious File
Score:
1.00
YARA Signatures
MalwareBazaar uses YARA rules from several public and non-public repositories, such as YARAhub and Malpedia. Those are being matched against malware samples uploaded to MalwareBazaar as well as against any suspicious process dumps they may create. Please note that only results from TLP:CLEAR rules are being displayed.
| Rule name: | meth_get_eip |
|---|---|
| Author: | Willi Ballenthin |
| Rule name: | meth_stackstrings |
|---|---|
| Author: | Willi Ballenthin |
| Rule name: | shellcode |
|---|---|
| Author: | nex |
| Description: | Matched shellcode byte patterns |
| Rule name: | Windows_Trojan_Formbook |
|---|---|
| Author: | @malgamy12 |
| Rule name: | Windows_Trojan_Formbook_1112e116 |
|---|---|
| Author: | Elastic Security |
| Rule name: | win_formbook_auto |
|---|---|
| Author: | Felix Bilstein - yara-signator at cocacoding dot com |
| Description: | Detects win.formbook. |
| Rule name: | win_formbook_w0 |
|---|---|
| Author: | @malgamy12 |
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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