masslogger | a96a475be3398490fb0cb4e92cb758e7c8bba0f866f8fec08349043c7ea8313c

General

Target

Emailer ? Quarterly Tax Returns for April and March 2020.exe
Size

2.3MB
MD5

48beacc3662cc5784bb8bd925958f50b
SHA1

c17b246dbbaa86c3e252b2978ce747456cfba241
SHA256

6033acde8c4bde98b22ad4e45db8bc34123e794019b42750a3430ba97e33c804
SHA512

68757d4af66fb544321cf25ec10695fd3d6e9bbc89b3bcdde27c3fde49f7c85998976a2ee6c32cbb18a3a6cac9c08d9c7e4444796a03364bf1803256226d9042

Score

10^/10

masslogger collection persistence spyware stealer upx

Malware Config

Signatures

MassLogger
Masslogger is a .NET stealer targeting passwords from browsers, email and cryptocurrency clients.
stealer spyware masslogger

MassLogger log file 1 IoCs

Detects a log file produced by MassLogger.

yara_rule
masslogger_log_file

ACProtect 1.3x - 1.4x DLL software 1 IoCs

Detects file using ACProtect software.

resource	yara_rule
behavioral1/files/0x0007000000012685-60.dat	acprotect

UPX packed file 1 IoCs

Detects executables packed with UPX/modified UPX open source packer.

upx

resource	yara_rule
behavioral1/files/0x0007000000012685-60.dat	upx

Loads dropped DLL 1 IoCs

pid	Process
1680	InstallUtil.exe

Accesses Microsoft Outlook profiles 1 TTPs 15 IoCs

collection

Email Collection

T1114

description	ioc	Process
Key queried	\REGISTRY\USER\S-1-5-21-2277218442-1199762539-2004043321-1000\Software\Microsoft\Office\16.0\Outlook\Profiles\Outlook\9375CFF0413111d3B88A00104B2A6676	InstallUtil.exe
Key opened	\REGISTRY\USER\S-1-5-21-2277218442-1199762539-2004043321-1000\Software\Microsoft\Windows NT\CurrentVersion\Windows Messaging Subsystem\Profiles\Outlook\9375CFF0413111d3B88A00104B2A6676	InstallUtil.exe
Key created	\REGISTRY\USER\S-1-5-21-2277218442-1199762539-2004043321-1000\Software\Microsoft\Windows NT\CurrentVersion\Windows Messaging Subsystem\Profiles\Outlook	InstallUtil.exe
Key opened	\REGISTRY\USER\S-1-5-21-2277218442-1199762539-2004043321-1000\Software\Microsoft\Office\15.0\Outlook\Profiles\Outlook\9375CFF0413111d3B88A00104B2A6676	InstallUtil.exe
Key created	\REGISTRY\USER\S-1-5-21-2277218442-1199762539-2004043321-1000\Software\Microsoft\Office\15.0\Outlook\Profiles\Outlook\9375CFF0413111d3B88A00104B2A6676	InstallUtil.exe
Key queried	\REGISTRY\USER\S-1-5-21-2277218442-1199762539-2004043321-1000\Software\Microsoft\Office\15.0\Outlook\Profiles\Outlook	InstallUtil.exe
Key created	\REGISTRY\USER\S-1-5-21-2277218442-1199762539-2004043321-1000\Software\Microsoft\Office\16.0\Outlook\Profiles\Outlook	InstallUtil.exe
Key queried	\REGISTRY\USER\S-1-5-21-2277218442-1199762539-2004043321-1000\Software\Microsoft\Office\15.0\Outlook\Profiles\Outlook\9375CFF0413111d3B88A00104B2A6676	InstallUtil.exe
Key opened	\REGISTRY\USER\S-1-5-21-2277218442-1199762539-2004043321-1000\Software\Microsoft\Office\16.0\Outlook\Profiles\Outlook\9375CFF0413111d3B88A00104B2A6676	InstallUtil.exe
Key created	\REGISTRY\USER\S-1-5-21-2277218442-1199762539-2004043321-1000\Software\Microsoft\Office\16.0\Outlook\Profiles\Outlook\9375CFF0413111d3B88A00104B2A6676	InstallUtil.exe
Key created	\REGISTRY\USER\S-1-5-21-2277218442-1199762539-2004043321-1000\Software\Microsoft\Windows NT\CurrentVersion\Windows Messaging Subsystem\Profiles\Outlook\9375CFF0413111d3B88A00104B2A6676	InstallUtil.exe
Key queried	\REGISTRY\USER\S-1-5-21-2277218442-1199762539-2004043321-1000\Software\Microsoft\Windows NT\CurrentVersion\Windows Messaging Subsystem\Profiles\Outlook	InstallUtil.exe
Key queried	\REGISTRY\USER\S-1-5-21-2277218442-1199762539-2004043321-1000\Software\Microsoft\Windows NT\CurrentVersion\Windows Messaging Subsystem\Profiles\Outlook\9375CFF0413111d3B88A00104B2A6676	InstallUtil.exe
Key created	\REGISTRY\USER\S-1-5-21-2277218442-1199762539-2004043321-1000\Software\Microsoft\Office\15.0\Outlook\Profiles\Outlook	InstallUtil.exe
Key queried	\REGISTRY\USER\S-1-5-21-2277218442-1199762539-2004043321-1000\Software\Microsoft\Office\16.0\Outlook\Profiles\Outlook	InstallUtil.exe

Adds Run key to start application 2 TTPs 1 IoCs

persistence

Registry Run Keys / Startup Folder

T1060

Modify Registry

T1112

description	ioc	Process
Set value (str)	\REGISTRY\USER\S-1-5-21-2277218442-1199762539-2004043321-1000\Software\Microsoft\Windows\CurrentVersion\Run\wFkna = "C:\\AUVQQRRF\\wFknaA\\wFknaAqbs.vbs"	Emailer _ Quarterly Tax Returns for April and March 2020.exe

Looks up external IP address via web service 1 IoCs

Uses a legitimate IP lookup service to find the infected system's external IP.

flow	ioc
3	api.ipify.org

Maps connected drives based on registry 3 TTPs 2 IoCs

Disk information is often read in order to detect sandboxing environments.

Query Registry

T1012

Peripheral Device Discovery

T1120

System Information Discovery

T1082

description	ioc	Process
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Services\Disk\Enum	Emailer _ Quarterly Tax Returns for April and March 2020.exe
Key value queried	\REGISTRY\MACHINE\SYSTEM\ControlSet001\services\Disk\Enum\0	Emailer _ Quarterly Tax Returns for April and March 2020.exe

Suspicious use of SetThreadContext 1 IoCs

description	pid	Process	procid_target
PID 1192 set thread context of 1680	1192	Emailer _ Quarterly Tax Returns for April and March 2020.exe	28

Suspicious behavior: AddClipboardFormatListener 1 IoCs

pid	Process
1680	InstallUtil.exe

Suspicious behavior: EnumeratesProcesses 1 IoCs

pid	Process
1680	InstallUtil.exe

Suspicious behavior: MapViewOfSection 1 IoCs

pid	Process
1192	Emailer _ Quarterly Tax Returns for April and March 2020.exe

Suspicious use of AdjustPrivilegeToken 1 IoCs

description	pid	Process
Token: SeDebugPrivilege	1680	InstallUtil.exe

Suspicious use of SetWindowsHookEx 1 IoCs

pid	Process
1680	InstallUtil.exe

Suspicious use of WriteProcessMemory 8 IoCs

description	pid	Process	procid_target
PID 1192 wrote to memory of 1680	1192	Emailer _ Quarterly Tax Returns for April and March 2020.exe	28
PID 1192 wrote to memory of 1680	1192	Emailer _ Quarterly Tax Returns for April and March 2020.exe	28
PID 1192 wrote to memory of 1680	1192	Emailer _ Quarterly Tax Returns for April and March 2020.exe	28
PID 1192 wrote to memory of 1680	1192	Emailer _ Quarterly Tax Returns for April and March 2020.exe	28
PID 1192 wrote to memory of 1680	1192	Emailer _ Quarterly Tax Returns for April and March 2020.exe	28
PID 1192 wrote to memory of 1680	1192	Emailer _ Quarterly Tax Returns for April and March 2020.exe	28
PID 1192 wrote to memory of 1680	1192	Emailer _ Quarterly Tax Returns for April and March 2020.exe	28
PID 1192 wrote to memory of 1680	1192	Emailer _ Quarterly Tax Returns for April and March 2020.exe	28

outlook_office_path 1 IoCs

description	ioc	Process
Key queried	\REGISTRY\USER\S-1-5-21-2277218442-1199762539-2004043321-1000\Software\Microsoft\Office\16.0\Outlook\Profiles\Outlook\9375CFF0413111d3B88A00104B2A6676	InstallUtil.exe

outlook_win_path 1 IoCs

description	ioc	Process
Key queried	\REGISTRY\USER\S-1-5-21-2277218442-1199762539-2004043321-1000\Software\Microsoft\Windows NT\CurrentVersion\Windows Messaging Subsystem\Profiles\Outlook\9375CFF0413111d3B88A00104B2A6676	InstallUtil.exe

C:\Users\Admin\AppData\Local\Temp\Emailer _ Quarterly Tax Returns for April and March 2020.exe
"C:\Users\Admin\AppData\Local\Temp\Emailer _ Quarterly Tax Returns for April and March 2020.exe"
1⤵
- Adds Run key to start application
- Maps connected drives based on registry
- Suspicious use of SetThreadContext
- Suspicious behavior: MapViewOfSection
- Suspicious use of WriteProcessMemory
PID:1192
- C:\Windows\Microsoft.NET\Framework\v4.0.30319\InstallUtil.exe
  "C:\Windows\\\\Microsoft.NET\\\\Framework\\\\v4.0.30319\\\\InstallUtil.exe"
  2⤵
  - Loads dropped DLL
  - Accesses Microsoft Outlook profiles
  - Suspicious behavior: AddClipboardFormatListener
  - Suspicious behavior: EnumeratesProcesses
  - Suspicious use of AdjustPrivilegeToken
  - Suspicious use of SetWindowsHookEx
  - outlook_office_path
  - outlook_win_path
  PID:1680

Network

MITRE ATT&CK Enterprise v6

Initial Access

Execution

Persistence

Registry Run Keys / Startup Folder

1

T1060

Privilege Escalation

Defense Evasion

Modify Registry

1

T1112

Credential Access

Discovery

Peripheral Device Discovery

Query Registry

System Information Discovery

1

T1082

Lateral Movement

Collection

Email Collection

1

T1114

Command and Control

Exfiltration

Impact

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Downloads

\Users\Admin\AppData\Local\Temp\Costura\8E3603ED8A0381E02887C1DBBE921340\32\sqlite.interop.dll

Filesize
594KB

MD5
e81aeac387c5db32b7f9b07d15e788e0

SHA1
829be6eaf1cb0d82b2ddfc98272e1087f4a7a7c3

SHA256
44f31f99f048bfc5195937353b5207332e455bcd5a722bcfd32cacfd93f60f06

SHA512
cc6a96325a01c50c059706a1f4156f109e502ef9c0b0f5de209d1f52e7cc973cebc027f57ed988e9d1b8fca62746b60ee7430d608de95cdd0e5ac3cb61fbe32e

Download Submit
memory/1192-54-0x0000000000E50000-0x0000000001098000-memory.dmp

Filesize
2.3MB

Download
memory/1192-55-0x0000000004DF0000-0x0000000005040000-memory.dmp

Filesize
2.3MB

Download
memory/1192-56-0x0000000005200000-0x00000000053BE000-memory.dmp

Filesize
1.7MB

Download
memory/1192-58-0x0000000000860000-0x0000000000863000-memory.dmp

Filesize
12KB

Download
memory/1680-59-0x0000000000400000-0x000000000055E000-memory.dmp

Filesize
1.4MB

Download
memory/1680-61-0x00000000765C1000-0x00000000765C3000-memory.dmp

Filesize
8KB

Download
memory/1680-62-0x00000000007D0000-0x0000000000814000-memory.dmp

Filesize
272KB

Download
memory/1680-63-0x0000000000740000-0x00000000007D0000-memory.dmp

Filesize
576KB

Download
memory/1680-64-0x0000000005DB0000-0x0000000005E10000-memory.dmp

Filesize
384KB

Download

Analysis

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