Analysis
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max time kernel
128s -
max time network
155s -
platform
windows10-2004_x64 -
resource
win10v2004-20220414-en -
submitted
21-05-2022 00:58
Static task
static1
Behavioral task
behavioral1
Sample
Sheet.......pdf.exe
Resource
win7-20220414-en
Behavioral task
behavioral2
Sample
Sheet.......pdf.exe
Resource
win10v2004-20220414-en
General
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Target
Sheet.......pdf.exe
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Size
437KB
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MD5
ac621011571eca9bfcc83b3457e8bc4e
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SHA1
9979d2ac17eaaeb8c65457212cd0b8f25db24dc4
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SHA256
c4ccd023eed63b7c47c69e1b08e267f4579cc54e9998f3767d7c1438127b6d1a
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SHA512
86715884fc9ce924919b37ec820ebf57f8acf7ede3eadd4aa1af71da9d606bf8e3f41f33b2e958bd11826377a7ccdd94f1328235fb457a41041592e30500b783
Malware Config
Extracted
Protocol: smtp- Host:
us2.smtp.mailhostbox.com - Port:
587 - Username:
[email protected] - Password:
nnedimma080
Extracted
agenttesla
Protocol: smtp- Host:
us2.smtp.mailhostbox.com - Port:
587 - Username:
[email protected] - Password:
nnedimma080
Signatures
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AgentTesla
Agent Tesla is a remote access tool (RAT) written in visual basic.
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AgentTesla Payload 1 IoCs
Processes:
resource yara_rule behavioral2/memory/3308-134-0x0000000000400000-0x000000000044C000-memory.dmp family_agenttesla -
Checks computer location settings 2 TTPs 1 IoCs
Looks up country code configured in the registry, likely geofence.
Processes:
Sheet.......pdf.exedescription ioc process Key value queried \REGISTRY\USER\S-1-5-21-1081944012-3634099177-1681222835-1000\Control Panel\International\Geo\Nation Sheet.......pdf.exe -
Reads data files stored by FTP clients 2 TTPs
Tries to access configuration files associated with programs like FileZilla.
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Reads user/profile data of local email clients 2 TTPs
Email clients store some user data on disk where infostealers will often target it.
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Reads user/profile data of web browsers 2 TTPs
Infostealers often target stored browser data, which can include saved credentials etc.
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Accesses Microsoft Outlook profiles 1 TTPs 3 IoCs
Processes:
Sheet.......pdf.exedescription ioc process Key opened \REGISTRY\USER\S-1-5-21-1081944012-3634099177-1681222835-1000\Software\Microsoft\Office\15.0\Outlook\Profiles\Outlook\9375CFF0413111d3B88A00104B2A6676 Sheet.......pdf.exe Key opened \REGISTRY\USER\S-1-5-21-1081944012-3634099177-1681222835-1000\Software\Microsoft\Windows NT\CurrentVersion\Windows Messaging Subsystem\Profiles\Outlook\9375CFF0413111d3B88A00104B2A6676 Sheet.......pdf.exe Key opened \REGISTRY\USER\S-1-5-21-1081944012-3634099177-1681222835-1000\Software\Microsoft\Office\16.0\Outlook\Profiles\Outlook\9375CFF0413111d3B88A00104B2A6676 Sheet.......pdf.exe -
Adds Run key to start application 2 TTPs 1 IoCs
Processes:
Sheet.......pdf.exedescription ioc process Set value (str) \REGISTRY\USER\S-1-5-21-1081944012-3634099177-1681222835-1000\SOFTWARE\Microsoft\Windows\CurrentVersion\Run\YYtJku = "C:\\Users\\Admin\\AppData\\Roaming\\YYtJku\\YYtJku.exe" Sheet.......pdf.exe -
Suspicious use of SetThreadContext 1 IoCs
Processes:
Sheet.......pdf.exedescription pid process target process PID 1392 set thread context of 3308 1392 Sheet.......pdf.exe Sheet.......pdf.exe -
Enumerates physical storage devices 1 TTPs
Attempts to interact with connected storage/optical drive(s). Likely ransomware behaviour.
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Creates scheduled task(s) 1 TTPs 1 IoCs
Schtasks is often used by malware for persistence or to perform post-infection execution.
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Suspicious behavior: EnumeratesProcesses 2 IoCs
Processes:
Sheet.......pdf.exepid process 3308 Sheet.......pdf.exe 3308 Sheet.......pdf.exe -
Suspicious behavior: RenamesItself 1 IoCs
Processes:
Sheet.......pdf.exepid process 3308 Sheet.......pdf.exe -
Suspicious use of AdjustPrivilegeToken 1 IoCs
Processes:
Sheet.......pdf.exedescription pid process Token: SeDebugPrivilege 3308 Sheet.......pdf.exe -
Suspicious use of WriteProcessMemory 11 IoCs
Processes:
Sheet.......pdf.exedescription pid process target process PID 1392 wrote to memory of 2600 1392 Sheet.......pdf.exe schtasks.exe PID 1392 wrote to memory of 2600 1392 Sheet.......pdf.exe schtasks.exe PID 1392 wrote to memory of 2600 1392 Sheet.......pdf.exe schtasks.exe PID 1392 wrote to memory of 3308 1392 Sheet.......pdf.exe Sheet.......pdf.exe PID 1392 wrote to memory of 3308 1392 Sheet.......pdf.exe Sheet.......pdf.exe PID 1392 wrote to memory of 3308 1392 Sheet.......pdf.exe Sheet.......pdf.exe PID 1392 wrote to memory of 3308 1392 Sheet.......pdf.exe Sheet.......pdf.exe PID 1392 wrote to memory of 3308 1392 Sheet.......pdf.exe Sheet.......pdf.exe PID 1392 wrote to memory of 3308 1392 Sheet.......pdf.exe Sheet.......pdf.exe PID 1392 wrote to memory of 3308 1392 Sheet.......pdf.exe Sheet.......pdf.exe PID 1392 wrote to memory of 3308 1392 Sheet.......pdf.exe Sheet.......pdf.exe -
outlook_office_path 1 IoCs
Processes:
Sheet.......pdf.exedescription ioc process Key opened \REGISTRY\USER\S-1-5-21-1081944012-3634099177-1681222835-1000\Software\Microsoft\Office\16.0\Outlook\Profiles\Outlook\9375CFF0413111d3B88A00104B2A6676 Sheet.......pdf.exe -
outlook_win_path 1 IoCs
Processes:
Sheet.......pdf.exedescription ioc process Key opened \REGISTRY\USER\S-1-5-21-1081944012-3634099177-1681222835-1000\Software\Microsoft\Windows NT\CurrentVersion\Windows Messaging Subsystem\Profiles\Outlook\9375CFF0413111d3B88A00104B2A6676 Sheet.......pdf.exe
Processes
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C:\Users\Admin\AppData\Local\Temp\Sheet.......pdf.exe"C:\Users\Admin\AppData\Local\Temp\Sheet.......pdf.exe"1⤵
- Checks computer location settings
- Suspicious use of SetThreadContext
- Suspicious use of WriteProcessMemory
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C:\Windows\SysWOW64\schtasks.exe"C:\Windows\System32\schtasks.exe" /Create /TN "Updates\hrZoEWJfRidjT" /XML "C:\Users\Admin\AppData\Local\Temp\tmp9E72.tmp"2⤵
- Creates scheduled task(s)
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C:\Users\Admin\AppData\Local\Temp\Sheet.......pdf.exe"{path}"2⤵
- Accesses Microsoft Outlook profiles
- Adds Run key to start application
- Suspicious behavior: EnumeratesProcesses
- Suspicious behavior: RenamesItself
- Suspicious use of AdjustPrivilegeToken
- outlook_office_path
- outlook_win_path
Network
MITRE ATT&CK Matrix ATT&CK v6
Replay Monitor
Loading Replay Monitor...
Downloads
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C:\Users\Admin\AppData\Local\Microsoft\CLR_v2.0_32\UsageLogs\Sheet.......pdf.exe.logFilesize
496B
MD5cb76b18ebed3a9f05a14aed43d35fba6
SHA1836a4b4e351846fca08b84149cb734cb59b8c0d6
SHA2568d0edecf54cbbdf7981c8e41a3ed8621503188a87415f9af0fb8d890b138c349
SHA5127631141e4a6dda29452ada666326837372cd3d045f773006f63d9eff15d9432ed00029d9108a72c1a3b858377600a2aab2c9ec03764285c8801b6019babcf21c
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C:\Users\Admin\AppData\Local\Temp\tmp9E72.tmpFilesize
1KB
MD505106614aadec497e560d468ca204083
SHA11a5bb798bd70796087f36e79941bfc17e8c47da9
SHA256d5e10ec0a80b97548817aa6b469896f13b356ec4c4684fbfc8c1fc5f4fc45e70
SHA512ed59678854ab5fe3c088cac234690ab8c9e14ddc23beac2703cee23de065d015edd8ad4acb83c5d99a9dd8ec14e4e101061088169ffe8bf2b3690be5d4cb00ad
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memory/1392-130-0x0000000075570000-0x0000000075B21000-memory.dmpFilesize
5.7MB
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memory/2600-131-0x0000000000000000-mapping.dmp
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memory/3308-133-0x0000000000000000-mapping.dmp
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memory/3308-134-0x0000000000400000-0x000000000044C000-memory.dmpFilesize
304KB
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memory/3308-136-0x0000000075570000-0x0000000075B21000-memory.dmpFilesize
5.7MB