MalwareBazaar Database

You are currently viewing the MalwareBazaar entry for SHA256 6440c517ffee4597f50836eb8d40258ccca1055cffc6498a2e071ec0e23fcc94. 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: 8


Maldoc score: 11


Intelligence 8 IOCs YARA 6 File information Comments
Download sample Add tag Delete this sample Report a False Positive

SHA256 hash: 6440c517ffee4597f50836eb8d40258ccca1055cffc6498a2e071ec0e23fcc94
SHA3-384 hash: 17d9150f54a1ebd7945d3c28a3bc7eaefb5783fd9710c66f7c75ed7219db449806ac830e3d43c9341b3311404ca6ff15
SHA1 hash: 8e55ac18331fe1caa099fe372dc8f2a9b4190050
MD5 hash: f75921fb937644a4f11f912508c1c96d
humanhash: double-fillet-solar-king
File name:MACHINE SPECIFICATION.xlsb
Download: download sample
Signature AsyncRAT
Create hunting rule
File size:46'459 bytes
First seen:2021-07-08 07:44:16 UTC
Last seen:2021-07-08 08:39:21 UTC
File type:Excel file xlsx
MIME type:application/vnd.openxmlformats-officedocument.spreadsheetml.sheet
ssdeep 768:yokOiCymS6RFh6gbt3Oxlqoju8Yvcinc9pRn3Ttyyyyyyyyyyyyyyyyyyyyy/W+v:yEiCtS67fbt3YBjpXic9n3Ttyyyyyyyh
TLSH T10023AD42F1886E74ED6CFA3C2C1F0D1418721368A684B785489F8F1D397B7C7AB4609E
Reporter lowmal3
Tags:AsyncRAT 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 id
Maldoc score: 11
OLE dump

MalwareBazaar was able to identify 12 sections in this file using oledump:

Section IDSection sizeSection name
A1465 bytesPROJECT
A289 bytesPROJECTwm
A3991 bytesVBA/Sheet1
A41358 bytesVBA/ThisWorkbook
A52824 bytesVBA/_VBA_PROJECT
A61639 bytesVBA/__SRP_0
A7183 bytesVBA/__SRP_1
A8266 bytesVBA/__SRP_2
A9284 bytesVBA/__SRP_3
A10572 bytesVBA/dir
A118180 bytesVBA/llwlcibi
OLE vba

MalwareBazaar was able to extract and deobfuscate VBA script(s) the following information from OLE objects embedded in this file using olevba:

TypeKeywordDescription
AutoExecWorkbook_OpenRuns when the Excel Workbook is opened
SuspiciousRunMay run an executable file or a system command
SuspiciousCreateObjectMay create an OLE object
SuspiciousChrMay attempt to obfuscate specific strings (use option --deobf to deobfuscate)
SuspiciousHex StringsHex-encoded strings were detected, may be used to obfuscate strings (option --decode to see all)
SuspiciousBase64 StringsBase64-encoded strings were detected, may be used to obfuscate strings (option --decode to see all)

Intelligence

File Origin
# of uploads :
2
# of downloads :
102
Origin country :
n/a
Vendor Threat Intelligence
Malware family:
n/a
ID:
1
File name:
MACHINE SPECIFICATION.xlsb
Verdict:
No threats detected
Analysis date:
2021-07-08 07:46:17 UTC
Tags:
macros macros-on-open
Link:
https://app.any.run/tasks/38e8bd7b-1583-469d-bde5-d4645f9f7938

Note:
ANY.RUN is an interactive sandbox that analyzes all user actions rather than an uploaded sample
Verdict:
Legit
File type:
application/vnd.openxmlformats-officedocument.spreadsheetml.sheet
Has a screenshot:
False
Contains macros:
True
Detection:
n/a
Link:
https://www.capesandbox.com/analysis/170368/
Detection(s):
MiscreantPunch.EvilMacro.PSHELLFromB64w.6.UNOFFICIAL
Create hunting rule

TwinWave.EvilDoc.WSHCROVARCHRMATHLONGGONE.20200524.UNOFFICIAL
Create hunting rule

TwinWave.EvilDoc.DOCXRSTRGOOD._IEX.210408B64.4.UNOFFICIAL
Create hunting rule

Result
Verdict:
Malicious
File Type:
Excel File with Macro
Link:
https://app.docguard.net/6440c517ffee4597f50836eb8d40258ccca1055cffc6498a2e071ec0e23fcc94/results/dashboard
Document image
Image:
Download PNG
Document image
Result
Verdict:
MALICIOUS
Link:
https://labs.inquest.net/dfi/sha256/6440c517ffee4597f50836eb8d40258ccca1055cffc6498a2e071ec0e23fcc94
Details
Base64 Encoded Powershell Directives
Detected one or more base64 encoded Powershell directives.
Macro with Startup Hook
Detected macro logic that will automatically execute on document open. Most malware contains some execution hook.
Macro Execution Coercion
Detected a document that appears to social engineer the user into activating embedded logic.
Result
Threat name:
AsyncRAT
Create hunting rule
Detection:
malicious
Classification:
troj.expl.evad
Score:
100 / 100
Link:
https://www.joesandbox.com/analysis/813317
Signature
Allocates memory in foreign processes
C2 URLs / IPs found in malware configuration
Document contains an embedded VBA macro which may execute processes
Document exploit detected (process start blacklist hit)
Encrypted powershell cmdline option found
Found malware configuration
Injects a PE file into a foreign processes
Machine Learning detection for sample
Multi AV Scanner detection for submitted file
Obfuscated command line found
PowerShell case anomaly found
Sample uses process hollowing technique
Sigma detected: Microsoft Office Product Spawning Windows Shell
Sigma detected: Suspicious Process Start Without DLL
Snort IDS alert for network traffic (e.g. based on Emerging Threat rules)
Tries to detect sandboxes and other dynamic analysis tools (process name or module or function)
Very long command line found
Writes to foreign memory regions
Yara detected AsyncRAT
Yara detected Costura Assembly Loader
Behaviour
Behavior Graph:
Download SVG
behaviorgraph top1 signatures2 2 Behavior Graph ID: 445728 Sample: MACHINE SPECIFICATION.xlsb Startdate: 08/07/2021 Architecture: WINDOWS Score: 100 35 Snort IDS alert for network traffic (e.g. based on Emerging Threat rules) 2->35 37 Found malware configuration 2->37 39 Multi AV Scanner detection for submitted file 2->39 41 11 other signatures 2->41 9 EXCEL.EXE 53 14 2->9         started        13 go.exe 2->13         started        process3 file4 29 C:\Users\...\~$MACHINE SPECIFICATION.xlsb, data 9->29 dropped 51 Obfuscated command line found 9->51 53 Very long command line found 9->53 15 cmd.exe 9->15         started        55 Writes to foreign memory regions 13->55 57 Allocates memory in foreign processes 13->57 59 Sample uses process hollowing technique 13->59 61 Injects a PE file into a foreign processes 13->61 18 RegSvcs.exe 13->18         started        signatures5 process6 signatures7 63 Very long command line found 15->63 65 Encrypted powershell cmdline option found 15->65 67 PowerShell case anomaly found 15->67 20 powershell.exe 6 15->20         started        process8 dnsIp9 31 transfer.sh 144.76.136.153, 49167, 80 HETZNER-ASDE Germany 20->31 23 go.exe 20->23         started        process10 signatures11 43 Writes to foreign memory regions 23->43 45 Allocates memory in foreign processes 23->45 47 Sample uses process hollowing technique 23->47 49 Injects a PE file into a foreign processes 23->49 26 RegSvcs.exe 23->26         started        process12 dnsIp13 33 37.0.8.17, 46422, 49168, 49170 WKD-ASIE Netherlands 26->33
Detection:
n/a
Link:
https://mwdb.cert.pl/sample/6440c517ffee4597f50836eb8d40258ccca1055cffc6498a2e071ec0e23fcc94/
Threat name:
Document-Word.Trojan.Valyria
Create hunting rule
Status:
Malicious
First seen:
2021-07-08 07:45:07 UTC
AV detection:
17 of 46 (36.96%)
Threat level:
  5/5
Detection(s):
Suspicious file
Link:
https://check.spamhaus.org/check/?searchterm=mramkf775zczp5iig3vy2qbfrtgkcbk477detcroa4pmbyr7zska._file
Result
Malware family:
asyncrat
Create hunting rule
Score:
  10/10
Tags:
family:asyncrat macro persistence rat
Link:
https://tria.ge/reports/210708-3vw43awp1x/
Behaviour
Checks processor information in registry
Enumerates system info in registry
Modifies Internet Explorer settings
Suspicious behavior: AddClipboardFormatListener
Suspicious behavior: EnumeratesProcesses
Suspicious use of AdjustPrivilegeToken
Suspicious use of SetWindowsHookEx
Suspicious use of WriteProcessMemory
Office loads VBA resources, possible macro or embedded object present
Suspicious use of SetThreadContext
Adds Run key to start application
Loads dropped DLL
Blocklisted process makes network request
Downloads MZ/PE file
Executes dropped EXE
Async RAT payload
AsyncRat
Process spawned unexpected child process
Malware Config
C2 Extraction:
chonglee575.duckdns.org:6578
chonglee575.duckdns.org:46422
37.0.8.17:6578
37.0.8.17:46422
Please note that we are no longer able to provide a coverage score for Virus Total.
Threat name:
Malicious File
Score:
1.00
Link:
https://yomi.yoroi.company/submissions/6440c517ffee4597f50836eb8d40258ccca1055cffc6498a2e071ec0e23fcc94

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:Email_stealer_bin_mem
Create hunting rule
Author:James_inthe_box
Description:Email in files like avemaria
Rule name:INDICATOR_SUSPICIOUS_Stomped_PECompilation_Timestamp_InTheFuture
Create hunting rule
Author:ditekSHen
Description:Detect executables with stomped PE compilation timestamp that is greater than local current time
Rule name:IPPort_combo_mem
Create hunting rule
Author:James_inthe_box
Description:IP and port combo
Rule name:Select_from_enumeration
Create hunting rule
Author:James_inthe_box
Description:IP and port combo
Rule name:SharedStrings
Create hunting rule
Author:Katie Kleemola
Description:Internal names found in LURK0/CCTV0 samples
Rule name:UAC_bypass_bin_mem
Create hunting rule
Author:James_inthe_box
Description:UAC bypass in files like avemaria

File information

The table below shows additional information about this malware sample such as delivery method and external references.

Malspam

AsyncRAT

Excel file xlsx 6440c517ffee4597f50836eb8d40258ccca1055cffc6498a2e071ec0e23fcc94

(this sample)

  
Delivery method
Distributed via e-mail attachment
Cape
Cape
https://www.capesandbox.com/analysis/170368/

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