MalwareBazaar Database

You are currently viewing the MalwareBazaar entry for SHA256 707adf85c61f5029e14aa27791010f2959e70c0fee182fe968d2eb7f2991797b. 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


OskiStealer


Vendor detections: 12


Intelligence 12 IOCs 7 YARA 5 File information Comments
Download sample Add tag Delete this sample Report a False Positive

SHA256 hash: 707adf85c61f5029e14aa27791010f2959e70c0fee182fe968d2eb7f2991797b
SHA3-384 hash: 0315aad176b80b74d5367aa45f1140c2fe729d12b284fc0b36affc1053cabc22699bc7d7ea1f5a8b48f97560dc44795e
SHA1 hash: 219aead020c82c2c91c35cdf441afe12403e8cde
MD5 hash: e16d2840d1f41c9688f45e322a9a086b
humanhash: virginia-six-mississippi-mountain
File name:triage_dropped_file
Download: download sample
Signature OskiStealer
Create hunting rule
File size:950'784 bytes
First seen:2022-04-28 18:20:30 UTC
Last seen:Never
File type:Executable exe
MIME type:application/x-dosexec
imphash f34d5f2d4577ed6d9ceec516c1f5a744 (48'741 x AgentTesla, 19'606 x Formbook, 12'242 x SnakeKeylogger)
ssdeep 12288:O4/CLWJekNyYbvT0JaqVKODgA0rPkJ6DOS7MlEEax7S3rVvmY8CKKGfoaBH91A2r:NOQS75g5rPs6voVvLa5rLzf
Threatray 1'723 similar samples on MalwareBazaar
TLSH T1C015F15AB948CAB5D5384A33FED3940C17523CF4EA02C15BBAD3B2460E323B64D956B7
TrID 72.5% (.EXE) Generic CIL Executable (.NET, Mono, etc.) (73123/4/13)
10.4% (.EXE) Win64 Executable (generic) (10523/12/4)
6.5% (.DLL) Win32 Dynamic Link Library (generic) (6578/25/2)
4.4% (.EXE) Win32 Executable (generic) (4505/5/1)
2.0% (.EXE) OS/2 Executable (generic) (2029/13)
File icon (PE):PE icon
dhash icon f3fbfbfbdbdbdbdb (6 x AgentTesla, 3 x Formbook, 2 x NanoCore)
Reporter malwarelabnet
Tags:exe oski OskiStealer

Indicators Of Compromise (IOCs)

Below is a list of indicators of compromise (IOCs) associated with this malware samples.

IOCThreatFox Reference
http://alazlfa.cf/3.jpg https://threatfox.abuse.ch/ioc/537375/
http://alazlfa.cf/1.jpg https://threatfox.abuse.ch/ioc/537376/
http://alazlfa.cf/4.jpg https://threatfox.abuse.ch/ioc/537377/
http://alazlfa.cf/6.jpg https://threatfox.abuse.ch/ioc/537378/
http://alazlfa.cf/7.jpg https://threatfox.abuse.ch/ioc/537379/
http://alazlfa.cf/5.jpg https://threatfox.abuse.ch/ioc/537380/
http://alazlfa.cf/2.jpg https://threatfox.abuse.ch/ioc/537381/

Intelligence

File Origin
# of uploads :
1
# of downloads :
428
Origin country :
n/a
Vendor Threat Intelligence
Malware family:
n/a
ID:
1
File name:
GBEYBE.doc
Verdict:
Malicious activity
Analysis date:
2022-04-28 18:02:29 UTC
Tags:
ole-embedded generated-doc
Link:
https://app.any.run/tasks/8d47a0ff-a6db-4167-9d92-be124e910be4

Note:
ANY.RUN is an interactive sandbox that analyzes all user actions rather than an uploaded sample
Detection:
n/a
Link:
https://www.capesandbox.com/analysis/267595/
Detection(s):
SecuriteInfo.com.Trojan.PackedNET.1321.12009.4727.UNOFFICIAL
Create hunting rule

Result
Verdict:
Malware
Maliciousness:

Behaviour
Searching for the window
Creating a window
Launching a process
Creating a process with a hidden window
Creating a file
Verdict:
Malicious
Threat level:
  10/10
Confidence:
100%
Tags:
control.exe obfuscated packed
Link:
https://www.filescan.io/uploads/626adb3462b1ae4451b9f37c/reports/6a3a7876-f9db-4ab9-ac23-9826fb433424/overview
Result
Verdict:
UNKNOWN
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
Create hunting rule
Verdict:
Malicious
Link:
https://analyze.intezer.com/analyses/022e14ad-bdfd-4eb9-82b9-89b86163bf29
Result
Threat name:
Oski Stealer Vidar
Create hunting rule
Detection:
malicious
Classification:
troj.spyw.evad
Score:
100 / 100
Link:
https://www.joesandbox.com/analysis/985048
Signature
.NET source code contains potential unpacker
Adds a directory exclusion to Windows Defender
C2 URLs / IPs found in malware configuration
Found malware configuration
Found many strings related to Crypto-Wallets (likely being stolen)
Machine Learning detection for dropped file
Machine Learning detection for sample
Malicious sample detected (through community Yara rule)
Multi AV Scanner detection for dropped file
Multi AV Scanner detection for submitted file
Posts data to a JPG file (protocol mismatch)
Sigma detected: Suspicious Add Scheduled Task From User AppData Temp
Snort IDS alert for network traffic
Tries to detect sandboxes and other dynamic analysis tools (process name or module or function)
Tries to harvest and steal browser information (history, passwords, etc)
Uses schtasks.exe or at.exe to add and modify task schedules
Yara detected AntiVM3
Yara detected Oski Stealer
Yara detected Vidar stealer
Behaviour
Behavior Graph:
Download SVG
behaviorgraph top1 signatures2 2 Behavior Graph ID: 617544 Sample: triage_dropped_file Startdate: 28/04/2022 Architecture: WINDOWS Score: 100 37 Snort IDS alert for network traffic 2->37 39 Found malware configuration 2->39 41 Malicious sample detected (through community Yara rule) 2->41 43 13 other signatures 2->43 7 triage_dropped_file.exe 7 2->7         started        process3 file4 27 C:\Users\user\AppData\...\cYcPaAiPYUC.exe, PE32 7->27 dropped 29 C:\Users\...\cYcPaAiPYUC.exe:Zone.Identifier, ASCII 7->29 dropped 31 C:\Users\user\AppData\Local\...\tmpD406.tmp, XML 7->31 dropped 33 C:\Users\user\...\triage_dropped_file.exe.log, ASCII 7->33 dropped 45 Uses schtasks.exe or at.exe to add and modify task schedules 7->45 47 Adds a directory exclusion to Windows Defender 7->47 11 triage_dropped_file.exe 28 7->11         started        15 powershell.exe 24 7->15         started        17 schtasks.exe 1 7->17         started        19 triage_dropped_file.exe 7->19         started        signatures5 process6 dnsIp7 35 alazlfa.cf 91.235.116.232, 49762, 49763, 49764 THCPROJECTSRO Romania 11->35 49 Tries to harvest and steal browser information (history, passwords, etc) 11->49 21 WerFault.exe 23 9 11->21         started        23 conhost.exe 15->23         started        25 conhost.exe 17->25         started        signatures8 process9
Detection:
n/a
Link:
https://mwdb.cert.pl/sample/707adf85c61f5029e14aa27791010f2959e70c0fee182fe968d2eb7f2991797b/
Threat name:
ByteCode-MSIL.Trojan.AgentTesla
Create hunting rule
Status:
Malicious
First seen:
2022-04-28 11:25:05 UTC
File Type:
PE (.Net Exe)
Extracted files:
25
AV detection:
16 of 26 (61.54%)
Threat level:
  5/5
Detection(s):
Suspicious file
Link:
https://check.spamhaus.org/check/?searchterm=ob5n7bogd5ictykkuj3zcaipffm6odap5ymc72li2lvx6kmrpf5q._file
Verdict:
malicious
Similar samples:
14a2149ffb9dc7a2bfa96e92ee4d7052222d5550431ffebc471b31859b397024
OskiStealer
2deef9054fe29f8e5521c0b41ba1ecd79f010b6c57b04596c6f84cfaacf52bc9
OskiStealer
31db1eaded87c877869d4c247c2da6fa3be4de4f8bcaebf61f499c50275345d6
OskiStealer
48d338ba06ada3da080eeeddb8a267b1b677dc9c3670f13e333ec8c73ff1b02c
OskiStealer
5e6d2bd21400ace31fbbe40c90d5bc5bab25868d252964b1034fc2584525709b
OskiStealer
8ee287ccb2bc4914729b74f55d465ce67fb5fce8f5af46e6bcf3e55b77b95e38
OskiStealer
+ 1'713 additional samples on MalwareBazaar
Result
Malware family:
oski
Create hunting rule
Score:
  10/10
Tags:
family:oski discovery infostealer spyware stealer suricata
Link:
https://tria.ge/reports/220428-wzg73sfbg5/
Behaviour
Checks processor information in registry
Creates scheduled task(s)
Kills process with taskkill
Suspicious behavior: EnumeratesProcesses
Suspicious use of AdjustPrivilegeToken
Suspicious use of WriteProcessMemory
Enumerates physical storage devices
Suspicious use of SetThreadContext
Accesses cryptocurrency files/wallets, possible credential harvesting
Checks installed software on the system
Checks computer location settings
Deletes itself
Loads dropped DLL
Reads user/profile data of web browsers
Downloads MZ/PE file
Oski
suricata: ET MALWARE Suspicious Zipped Filename in Outbound POST Request (Passwords.txt)
suricata: ET MALWARE Suspicious Zipped Filename in Outbound POST Request (Passwords.txt) M2
suricata: ET MALWARE Vidar/Arkei/Megumin/Oski Stealer Data Exfil
suricata: ET MALWARE Vidar/Arkei/Megumin/Oski Stealer HTTP POST Pattern
Malware Config
C2 Extraction:
alazlfa.cf
Unpacked files
SH256 hash:
101d608d893ed193835cd04b4d06a79960032fb703c5268e910dd4880c53a992
MD5 hash:
94ea010aa2b385b5ad3d8d71f7704a2e
SHA1 hash:
912c31ced158c7200deb830fc16f2d6aa7687e32
Detections:
win_oski_g0
Create hunting rule
win_oski_auto
Create hunting rule
Link:
https://www.unpac.me/results/bb3f3e7f-8488-480c-bd6c-6a8fd82946bb/
Parent samples :
707adf85c61f5029e14aa27791010f2959e70c0fee182fe968d2eb7f2991797b
bed8bccee5865cfa5e6bb504ba19f983b954e9c9fe072f7186d4362d7fda0701
SH256 hash:
6f0ea0158e65935722107e5c0f9c246805dcae977514b2d5b43b90f94688985e
MD5 hash:
422d1c3e1c904ffc6ac485343b70d07c
SHA1 hash:
1d04333fe349518e42654ba44edc713a6566aa7b
Link:
https://www.unpac.me/results/bb3f3e7f-8488-480c-bd6c-6a8fd82946bb/
SH256 hash:
349adafb79c38401f04f2552cf3147716f8a2726a71920cbaa6b538c4a354d16
MD5 hash:
7d941a243209e2eb91c154266435b7fd
SHA1 hash:
0d38f952ea2fa3f274d8df8343a10951ed2f78c1
Link:
https://www.unpac.me/results/bb3f3e7f-8488-480c-bd6c-6a8fd82946bb/
SH256 hash:
92fc621e886ad486195efe1b074a5186c27599e3dd4d71c72cae3078b8660ae2
MD5 hash:
e80503550a2aa077f62f09c7dc6be7e4
SHA1 hash:
f93e86c149eac50b611a1f9a7b59f5d81026262c
Link:
https://www.unpac.me/results/bb3f3e7f-8488-480c-bd6c-6a8fd82946bb/
SH256 hash:
707adf85c61f5029e14aa27791010f2959e70c0fee182fe968d2eb7f2991797b
MD5 hash:
e16d2840d1f41c9688f45e322a9a086b
SHA1 hash:
219aead020c82c2c91c35cdf441afe12403e8cde
Link:
https://www.unpac.me/results/bb3f3e7f-8488-480c-bd6c-6a8fd82946bb/
Verdict:
Malicious
Link:
https://www.vmray.com/analyses/_mb/707adf85c61f/report/overview.html
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/707adf85c61f5029e14aa27791010f2959e70c0fee182fe968d2eb7f2991797b

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:MALWARE_Win_Vidar
Create hunting rule
Author:ditekSHen
Description:Detects Vidar / ArkeiStealer
Rule name:pe_imphash
Create hunting rule
Rule name:Skystars_Malware_Imphash
Create hunting rule
Author:Skystars LightDefender
Description:imphash
Rule name:Vidar
Create hunting rule
Author:kevoreilly
Description:Vidar Payload
Rule name:win_oski_auto
Create hunting rule
Author:Felix Bilstein - yara-signator at cocacoding dot com
Description:Detects win.oski.

File information

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

Cape
Cape
https://www.capesandbox.com/analysis/267595/

Comments