Analysis
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max time kernel
145s -
max time network
164s -
platform
windows7_x64 -
resource
win7-20220414-en -
submitted
21-05-2022 03:28
Static task
static1
Behavioral task
behavioral1
Sample
RK__PO_2.exe
Resource
win7-20220414-en
Behavioral task
behavioral2
Sample
RK__PO_2.exe
Resource
win10v2004-20220414-en
Behavioral task
behavioral3
Sample
RK__PO_N.exe
Resource
win7-20220414-en
Behavioral task
behavioral4
Sample
RK__PO_N.exe
Resource
win10v2004-20220414-en
General
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Target
RK__PO_2.exe
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Size
982KB
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MD5
a5796bf649f72fdcae32b0a0241de4fb
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SHA1
f302b9c34ed15e69f1fbe938fc7b0c817a2c963f
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SHA256
5e2a294936d4b10a484ef84819a6279566e1f3028fd684b653998054f7f42181
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SHA512
96f30fc24421f53160080936ef73741df0b5b604d1a158e3bcbb2bb747b1bb827a46fa6b71276b1645c2b9b6bcc28f9e0f250d4d698a04321c70257f9b9ac92b
Malware Config
Extracted
C:\Users\Admin\AppData\Local\Temp\AEF946DCB4\Log.txt
masslogger
Signatures
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MassLogger
Masslogger is a .NET stealer targeting passwords from browsers, email and cryptocurrency clients.
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MassLogger Main Payload 33 IoCs
Processes:
resource yara_rule behavioral1/memory/1120-63-0x0000000000400000-0x00000000004B2000-memory.dmp family_masslogger behavioral1/memory/1120-64-0x0000000000400000-0x00000000004B2000-memory.dmp family_masslogger behavioral1/memory/1120-66-0x00000000004ACD7E-mapping.dmp family_masslogger behavioral1/memory/1120-65-0x0000000000400000-0x00000000004B2000-memory.dmp family_masslogger behavioral1/memory/1120-68-0x0000000000400000-0x00000000004B2000-memory.dmp family_masslogger behavioral1/memory/1120-70-0x0000000000400000-0x00000000004B2000-memory.dmp family_masslogger behavioral1/memory/1120-72-0x0000000000400000-0x00000000004B2000-memory.dmp family_masslogger behavioral1/memory/1120-74-0x0000000000400000-0x00000000004B2000-memory.dmp family_masslogger behavioral1/memory/1120-76-0x0000000000400000-0x00000000004B2000-memory.dmp family_masslogger behavioral1/memory/1120-78-0x0000000000400000-0x00000000004B2000-memory.dmp family_masslogger behavioral1/memory/1120-80-0x0000000000400000-0x00000000004B2000-memory.dmp family_masslogger behavioral1/memory/1120-82-0x0000000000400000-0x00000000004B2000-memory.dmp family_masslogger behavioral1/memory/1120-84-0x0000000000400000-0x00000000004B2000-memory.dmp family_masslogger behavioral1/memory/1120-86-0x0000000000400000-0x00000000004B2000-memory.dmp family_masslogger behavioral1/memory/1120-90-0x0000000000400000-0x00000000004B2000-memory.dmp family_masslogger behavioral1/memory/1120-88-0x0000000000400000-0x00000000004B2000-memory.dmp family_masslogger behavioral1/memory/1120-92-0x0000000000400000-0x00000000004B2000-memory.dmp family_masslogger behavioral1/memory/1120-94-0x0000000000400000-0x00000000004B2000-memory.dmp family_masslogger behavioral1/memory/1120-96-0x0000000000400000-0x00000000004B2000-memory.dmp family_masslogger behavioral1/memory/1120-98-0x0000000000400000-0x00000000004B2000-memory.dmp family_masslogger behavioral1/memory/1120-100-0x0000000000400000-0x00000000004B2000-memory.dmp family_masslogger behavioral1/memory/1120-102-0x0000000000400000-0x00000000004B2000-memory.dmp family_masslogger behavioral1/memory/1120-104-0x0000000000400000-0x00000000004B2000-memory.dmp family_masslogger behavioral1/memory/1120-110-0x0000000000400000-0x00000000004B2000-memory.dmp family_masslogger behavioral1/memory/1120-108-0x0000000000400000-0x00000000004B2000-memory.dmp family_masslogger behavioral1/memory/1120-112-0x0000000000400000-0x00000000004B2000-memory.dmp family_masslogger behavioral1/memory/1120-106-0x0000000000400000-0x00000000004B2000-memory.dmp family_masslogger behavioral1/memory/1120-114-0x0000000000400000-0x00000000004B2000-memory.dmp family_masslogger behavioral1/memory/1120-116-0x0000000000400000-0x00000000004B2000-memory.dmp family_masslogger behavioral1/memory/1120-118-0x0000000000400000-0x00000000004B2000-memory.dmp family_masslogger behavioral1/memory/1120-120-0x0000000000400000-0x00000000004B2000-memory.dmp family_masslogger behavioral1/memory/1120-122-0x0000000000400000-0x00000000004B2000-memory.dmp family_masslogger behavioral1/memory/1120-124-0x0000000000400000-0x00000000004B2000-memory.dmp family_masslogger -
MassLogger log file 1 IoCs
Detects a log file produced by MassLogger.
Processes:
yara_rule masslogger_log_file -
ReZer0 packer 1 IoCs
Detects ReZer0, a packer with multiple versions used in various campaigns.
Processes:
resource yara_rule behavioral1/memory/2040-57-0x0000000005F10000-0x0000000005FC8000-memory.dmp rezer0 -
Checks computer location settings 2 TTPs 1 IoCs
Looks up country code configured in the registry, likely geofence.
Processes:
RK__PO_2.exedescription ioc process Key value queried \REGISTRY\USER\S-1-5-21-1083475884-596052423-1669053738-1000\Control Panel\International\Geo\Nation RK__PO_2.exe -
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 15 IoCs
Processes:
RK__PO_2.exedescription ioc process Key opened \REGISTRY\USER\S-1-5-21-1083475884-596052423-1669053738-1000\Software\Microsoft\Office\15.0\Outlook\Profiles\Outlook\9375CFF0413111d3B88A00104B2A6676 RK__PO_2.exe Key queried \REGISTRY\USER\S-1-5-21-1083475884-596052423-1669053738-1000\Software\Microsoft\Office\15.0\Outlook\Profiles\Outlook RK__PO_2.exe Key opened \REGISTRY\USER\S-1-5-21-1083475884-596052423-1669053738-1000\Software\Microsoft\Office\16.0\Outlook\Profiles\Outlook\9375CFF0413111d3B88A00104B2A6676 RK__PO_2.exe Key created \REGISTRY\USER\S-1-5-21-1083475884-596052423-1669053738-1000\Software\Microsoft\Office\16.0\Outlook\Profiles\Outlook RK__PO_2.exe Key created \REGISTRY\USER\S-1-5-21-1083475884-596052423-1669053738-1000\Software\Microsoft\Windows NT\CurrentVersion\Windows Messaging Subsystem\Profiles\Outlook\9375CFF0413111d3B88A00104B2A6676 RK__PO_2.exe Key created \REGISTRY\USER\S-1-5-21-1083475884-596052423-1669053738-1000\Software\Microsoft\Office\15.0\Outlook\Profiles\Outlook RK__PO_2.exe Key queried \REGISTRY\USER\S-1-5-21-1083475884-596052423-1669053738-1000\Software\Microsoft\Office\15.0\Outlook\Profiles\Outlook\9375CFF0413111d3B88A00104B2A6676 RK__PO_2.exe Key opened \REGISTRY\USER\S-1-5-21-1083475884-596052423-1669053738-1000\Software\Microsoft\Windows NT\CurrentVersion\Windows Messaging Subsystem\Profiles\Outlook\9375CFF0413111d3B88A00104B2A6676 RK__PO_2.exe Key created \REGISTRY\USER\S-1-5-21-1083475884-596052423-1669053738-1000\Software\Microsoft\Windows NT\CurrentVersion\Windows Messaging Subsystem\Profiles\Outlook RK__PO_2.exe Key created \REGISTRY\USER\S-1-5-21-1083475884-596052423-1669053738-1000\Software\Microsoft\Office\15.0\Outlook\Profiles\Outlook\9375CFF0413111d3B88A00104B2A6676 RK__PO_2.exe Key created \REGISTRY\USER\S-1-5-21-1083475884-596052423-1669053738-1000\Software\Microsoft\Office\16.0\Outlook\Profiles\Outlook\9375CFF0413111d3B88A00104B2A6676 RK__PO_2.exe Key queried \REGISTRY\USER\S-1-5-21-1083475884-596052423-1669053738-1000\Software\Microsoft\Windows NT\CurrentVersion\Windows Messaging Subsystem\Profiles\Outlook RK__PO_2.exe Key queried \REGISTRY\USER\S-1-5-21-1083475884-596052423-1669053738-1000\Software\Microsoft\Office\16.0\Outlook\Profiles\Outlook RK__PO_2.exe Key queried \REGISTRY\USER\S-1-5-21-1083475884-596052423-1669053738-1000\Software\Microsoft\Office\16.0\Outlook\Profiles\Outlook\9375CFF0413111d3B88A00104B2A6676 RK__PO_2.exe Key queried \REGISTRY\USER\S-1-5-21-1083475884-596052423-1669053738-1000\Software\Microsoft\Windows NT\CurrentVersion\Windows Messaging Subsystem\Profiles\Outlook\9375CFF0413111d3B88A00104B2A6676 RK__PO_2.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.
Processes:
flow ioc 4 api.ipify.org -
Suspicious use of SetThreadContext 1 IoCs
Processes:
RK__PO_2.exedescription pid process target process PID 2040 set thread context of 1120 2040 RK__PO_2.exe RK__PO_2.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 3 IoCs
Processes:
RK__PO_2.exeRK__PO_2.exepid process 2040 RK__PO_2.exe 2040 RK__PO_2.exe 1120 RK__PO_2.exe -
Suspicious use of AdjustPrivilegeToken 2 IoCs
Processes:
RK__PO_2.exeRK__PO_2.exedescription pid process Token: SeDebugPrivilege 2040 RK__PO_2.exe Token: SeDebugPrivilege 1120 RK__PO_2.exe -
Suspicious use of WriteProcessMemory 13 IoCs
Processes:
RK__PO_2.exedescription pid process target process PID 2040 wrote to memory of 1784 2040 RK__PO_2.exe schtasks.exe PID 2040 wrote to memory of 1784 2040 RK__PO_2.exe schtasks.exe PID 2040 wrote to memory of 1784 2040 RK__PO_2.exe schtasks.exe PID 2040 wrote to memory of 1784 2040 RK__PO_2.exe schtasks.exe PID 2040 wrote to memory of 1120 2040 RK__PO_2.exe RK__PO_2.exe PID 2040 wrote to memory of 1120 2040 RK__PO_2.exe RK__PO_2.exe PID 2040 wrote to memory of 1120 2040 RK__PO_2.exe RK__PO_2.exe PID 2040 wrote to memory of 1120 2040 RK__PO_2.exe RK__PO_2.exe PID 2040 wrote to memory of 1120 2040 RK__PO_2.exe RK__PO_2.exe PID 2040 wrote to memory of 1120 2040 RK__PO_2.exe RK__PO_2.exe PID 2040 wrote to memory of 1120 2040 RK__PO_2.exe RK__PO_2.exe PID 2040 wrote to memory of 1120 2040 RK__PO_2.exe RK__PO_2.exe PID 2040 wrote to memory of 1120 2040 RK__PO_2.exe RK__PO_2.exe -
outlook_office_path 1 IoCs
Processes:
RK__PO_2.exedescription ioc process Key queried \REGISTRY\USER\S-1-5-21-1083475884-596052423-1669053738-1000\Software\Microsoft\Office\16.0\Outlook\Profiles\Outlook\9375CFF0413111d3B88A00104B2A6676 RK__PO_2.exe -
outlook_win_path 1 IoCs
Processes:
RK__PO_2.exedescription ioc process Key queried \REGISTRY\USER\S-1-5-21-1083475884-596052423-1669053738-1000\Software\Microsoft\Windows NT\CurrentVersion\Windows Messaging Subsystem\Profiles\Outlook\9375CFF0413111d3B88A00104B2A6676 RK__PO_2.exe
Processes
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C:\Users\Admin\AppData\Local\Temp\RK__PO_2.exe"C:\Users\Admin\AppData\Local\Temp\RK__PO_2.exe"1⤵
- Suspicious use of SetThreadContext
- Suspicious behavior: EnumeratesProcesses
- Suspicious use of AdjustPrivilegeToken
- Suspicious use of WriteProcessMemory
PID:2040 -
C:\Windows\SysWOW64\schtasks.exe"C:\Windows\System32\schtasks.exe" /Create /TN "Updates\zZyngPFdO" /XML "C:\Users\Admin\AppData\Local\Temp\tmp8518.tmp"2⤵
- Creates scheduled task(s)
PID:1784 -
C:\Users\Admin\AppData\Local\Temp\RK__PO_2.exe"{path}"2⤵
- Checks computer location settings
- Accesses Microsoft Outlook profiles
- Suspicious behavior: EnumeratesProcesses
- Suspicious use of AdjustPrivilegeToken
- outlook_office_path
- outlook_win_path
PID:1120
Network
MITRE ATT&CK Enterprise v6
Replay Monitor
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Downloads
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Filesize
1KB
MD5632983e1c563da4f8529159afcf45fd0
SHA1cf4d787bfe93edf2f1f0f770104e7f3e2721c110
SHA256bd6b913378dd8232e8f8c3c5a3b949bf63410993039f5c0e51e80331b4a427cd
SHA51280c0bf2593e4a3acff9715d117bd8e050e8a9bc6dfcaaa0f07b7a79c6d960a593babd99197d260cf37687ac546d37538944dfad2ec66c72f661f00f6bf2768e3