MalwareBazaar Database
You are currently viewing the MalwareBazaar entry for SHA256 13b52a2b81a99c5b40e1710dc68c74726cb5981676cb52585a218e696cc2846e. 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
AsyncRAT
Vendor detections: 13
Maldoc score: 23
| SHA256 hash: | 13b52a2b81a99c5b40e1710dc68c74726cb5981676cb52585a218e696cc2846e |
|---|---|
| SHA3-384 hash: | 843355a649314cfe7a275113a5893e14fc4d80d060e08b9982a971237be2ccdd6647f1a13a15de0b3a5b0879296ceb8e |
| SHA1 hash: | 15708709e2af12b8d448eb75c2a48957e9e5fe11 |
| MD5 hash: | 370a5cdc63cfc46e1e22f48b550b3ae0 |
| humanhash: | fix-monkey-timing-table |
| File name: | Payment_Calendar.xls |
| Download: | download sample |
| Signature | AsyncRAT |
| File size: | 123'392 bytes |
| First seen: | 2023-04-10 11:07:28 UTC |
| Last seen: | Never |
| File type: |  xls |
| MIME type: | application/vnd.ms-excel |
| ssdeep | 3072:aFxEtjPOtioVjDGUU1qfDlaGGx+cL2QnA9BT1cI/ojJYixhGHgHRJ4ukmOw5O7si:gxEtjPOtioVjDGUU1qfDlavx+W2QnA97 |
| TLSH | T149C3AFA37691F80AD90823358CDEC7E53766FD506E63A3473244FB2E7EB16D08D02666 |
| TrID | 46.5% (.XLS) Microsoft Excel sheet (alternate) (56500/1/4) 26.7% (.XLS) Microsoft Excel sheet (32500/1/3) 20.1% (.XLS) Microsoft Excel sheet (alternate) (24500/1/2) 6.5% (.) Generic OLE2 / Multistream Compound (8000/1) |
| Reporter |  abuse_ch |
| Tags: | AsyncRAT xls |
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 id
| Maldoc score: 23 |
OLE dump
MalwareBazaar was able to identify 17 sections in this file using oledump:
| Section ID | Section size | Section name |
|---|---|---|
| 1 | 107 bytes | CompObj |
| 2 | 244 bytes | DocumentSummaryInformation |
| 3 | 208 bytes | SummaryInformation |
| 4 | 91897 bytes | Workbook |
| 5 | 643 bytes | _VBA_PROJECT_CUR/PROJECT |
| 6 | 128 bytes | _VBA_PROJECT_CUR/PROJECTwm |
| 7 | 816 bytes | _VBA_PROJECT_CUR/VBA/Module1 |
| 8 | 977 bytes | _VBA_PROJECT_CUR/VBA/Sheet1 |
| 9 | 977 bytes | _VBA_PROJECT_CUR/VBA/Sheet2 |
| 10 | 977 bytes | _VBA_PROJECT_CUR/VBA/Sheet3 |
| 11 | 9541 bytes | _VBA_PROJECT_CUR/VBA/ThisWorkbook |
| 12 | 5950 bytes | _VBA_PROJECT_CUR/VBA/_VBA_PROJECT |
| 13 | 1896 bytes | _VBA_PROJECT_CUR/VBA/__SRP_0 |
| 14 | 789 bytes | _VBA_PROJECT_CUR/VBA/__SRP_1 |
| 15 | 476 bytes | _VBA_PROJECT_CUR/VBA/__SRP_2 |
| 16 | 544 bytes | _VBA_PROJECT_CUR/VBA/__SRP_3 |
| 17 | 614 bytes | _VBA_PROJECT_CUR/VBA/dir |
OLE vba
MalwareBazaar was able to extract and deobfuscate VBA script(s) the following information from OLE objects embedded in this file using olevba:
| Type | Keyword | Description |
|---|---|---|
| AutoExec | Workbook_Open | Runs when the Excel Workbook is opened |
| IOC | shell32.dll | Executable file name code and P-code are different, this may have been used to hide malicious code |
| Suspicious | Environ | May read system environment variables |
| Suspicious | open | May open a file |
| Suspicious | vbNormalFocus | May run an executable file or a system command |
| Suspicious | ShellExecuteA | May run an executable file or a system command |
| Suspicious | shell32 | May run an executable file or a system command |
| Suspicious | Lib | May run code from a DLL |
| Suspicious | URLDownloadToFileA | May download files from the Internet |
| Suspicious | Chr | May attempt to obfuscate specific strings (use option --deobf to deobfuscate) |
| Suspicious | StrReverse | May attempt to obfuscate specific strings (use option --deobf to deobfuscate) |
| Suspicious | Hex Strings | Hex-encoded strings were detected, may be used to obfuscate strings (option --decode to see all) |
| Suspicious | Base64 Strings | Base64-encoded strings were detected, may be used to obfuscate strings (option --decode to see all) |
Intelligence
File Origin
# of uploads :
1
# of downloads :
309
Origin country :
NLVendor Threat Intelligence
Malware family:
n/a
ID:
1
File name:
Payment_Calendar.xls
Verdict:
Malicious activity
Analysis date:
2023-04-10 11:08:55 UTC
Tags:
macros macros-on-open
Note:
ANY.RUN is an interactive sandbox that analyzes all user actions rather than an uploaded sample
Detection:
n/a
Result
Verdict:
Clean
Maliciousness:
Behaviour
Searching for the window
Sending a custom TCP request
Result
Verdict:
Malicious
File Type:
Legacy Excel File with Macro
Behaviour
BlacklistAPI detected
Document image
Image:
Verdict:
Malicious
Threat level:
10/10
Confidence:
100%
Tags:
evasive macros macros-on-open packed shell32.dll
Verdict:
Malicious
Labled as:
VBA.Heur2.SCrypted.3.4ED0013A
Label:
Malicious
Suspicious Score:
9.9/10
Score Malicious:
1%
Score Benign:
0%
Result
Verdict:
MALICIOUS
Link:
Details
Macro with Startup Hook
Detected macro logic that will automatically execute on document open. Most malware contains some execution hook.
Macro Contains Suspicious String
Detected a macro with a suspicious string. Suspicious strings include privileged function calls, obfuscations, odd registry keys, etc...
Macro with DLL Reference
Detected macro logic that will load additional functionality from Dynamically Linked Libraries (DLLs). While not explicitly malicious, this is a common tactic for accessing APIs that are not otherwised exposed via Visual Basic for Applications (VBA).
Document With Minimal Content
Document contains less than 1 kilobyte of semantic information.
Result
Threat name:
AsyncRAT
Detection:
malicious
Classification:
troj.expl.evad
Score:
100 / 100
Signature
Antivirus detection for dropped file
Antivirus detection for URL or domain
C2 URLs / IPs found in malware configuration
Document contains an embedded VBA macro which may execute processes
Document contains an embedded VBA macro with suspicious strings
Document contains an embedded VBA with hexadecimal encoded strings
Document contains VBA stomped code (only p-code) potentially bypassing AV detection
Document exploit detected (creates forbidden files)
Document exploit detected (drops PE files)
Document exploit detected (process start blacklist hit)
Document exploit detected (UrlDownloadToFile)
Machine Learning detection for dropped file
Machine Learning detection for sample
Malicious sample detected (through community Yara rule)
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 process drops PE file
Tries to detect sandboxes and other dynamic analysis tools (process name or module or function)
Yara detected AsyncRAT
Yara detected Generic Downloader
Behaviour
Behavior Graph:
Threat name:
Document-Word.Trojan.Leonem
Status:
Malicious
First seen:
2023-04-09 11:08:47 UTC
File Type:
Document
Extracted files:
26
AV detection:
16 of 24 (66.67%)
Threat level:
5/5
Detection(s):
Suspicious file
Result
Malware family:
asyncrat
Score:
10/10
Tags:
family:asyncrat botnet:dnock macro macro_on_action rat
Behaviour
Checks processor information in registry
Creates scheduled task(s)
Delays execution with timeout.exe
Enumerates system info in registry
Modifies Internet Explorer settings
Modifies registry class
Suspicious behavior: AddClipboardFormatListener
Suspicious behavior: EnumeratesProcesses
Suspicious use of AdjustPrivilegeToken
Suspicious use of FindShellTrayWindow
Suspicious use of SetWindowsHookEx
Suspicious use of WriteProcessMemory
Office loads VBA resources, possible macro or embedded object present
Enumerates physical storage devices
Suspicious use of SetThreadContext
Checks computer location settings
Executes dropped EXE
Downloads MZ/PE file
Async RAT payload
AsyncRat
Malware Config
C2 Extraction:
dnuocc.com:3306
dnuocc.com:1452
dnuocc.com:1452
Malware family:
AsyncRAT
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: | BitcoinAddress |
|---|---|
| Author: | Didier Stevens (@DidierStevens) |
| Description: | Contains a valid Bitcoin address |
| Rule name: | informational_win_ole_protected |
|---|---|
| Author: | Jeff White (karttoon@gmail.com) @noottrak |
| Description: | Identify OLE Project protection within documents. |
| Rule name: | malware_shellcode_hash |
|---|---|
| Author: | JPCERT/CC Incident Response Group |
| Description: | detect shellcode api hash value |
| Rule name: | meth_get_eip |
|---|---|
| Author: | Willi Ballenthin |
| Rule name: | pdb_YARAify |
|---|---|
| Author: | @wowabiy314 |
| Description: | PDB |
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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