flawedammyy | ee573647477339784dcef81024de1be1762833a20e5cc2b89a93e47d05b86b6a

General

Target
AA_v3-3.exe
Size 798KB
Sample260511-pdtwescw4k
SHA256 ee573647477339784dcef81024de1be1762833a20e5cc2b89a93e47d05b86b6a
MD5 90aadf2247149996ae443e2c82af3730
SHA1 050b7eba825412b24e3f02d76d7da5ae97e10502
SHA512 eec32bb82b230dd309c29712e72d4469250e651449e127479d178eddbafd5a46ec8048a753bc2c1a0fdf1dc3ed72a9453ca66fb49cbf0f95a12704e5427182be
SSDEEP 24576:Uj0JJ4p/A4npt3XojeQG5EtzRtO7GvmDguXd:UjoJ4u4zojegylDN
TLSH
T1EF059D133D81807FC2750571C98A1BB6FAF7EE940E798D436388BE3C5A76D01EE16629
MD5 SHA1 SHA512 SSDEEP TLSH

Score

10^/10

bootkit discovery flawedammyy persistence trojan

Malware Config

Signatures

Family: FlawedAmmyy RAT
Remote-access trojan based on leaked code for the Ammyy remote admin software.
trojan flawedammyy

Writes to the Master Boot Record (MBR) 1 TTPs 2 IoCs

Bootkits write to the MBR to gain persistence at a level below the operating system.

bootkit persistence

Bootkit

T1542.003

description	ioc	Process
File opened for modification	\??\PhysicalDrive0	AA_v3-3.exe
File opened for modification	\??\PhysicalDrive0	AA_v3-3.exe

Drops file in System32 directory 6 IoCs

description	ioc	Process
File opened for modification	C:\Windows\SysWOW64\config\systemprofile\AppData\LocalLow\Microsoft	AA_v3-3.exe
File opened for modification	C:\Windows\SysWOW64\config\systemprofile\AppData\LocalLow\Microsoft\CryptnetUrlCache	AA_v3-3.exe
File opened for modification	C:\Windows\SysWOW64\config\systemprofile\AppData\LocalLow\Microsoft\CryptnetUrlCache\MetaData	AA_v3-3.exe
File opened for modification	C:\Windows\SysWOW64\config\systemprofile\AppData\LocalLow\Microsoft\CryptnetUrlCache\MetaData\57C8EDB95DF3F0AD4EE2DC2B8CFD4157	AA_v3-3.exe
File opened for modification	C:\Windows\SysWOW64\config\systemprofile\AppData\LocalLow\Microsoft\CryptnetUrlCache\Content	AA_v3-3.exe
File opened for modification	C:\Windows\SysWOW64\config\systemprofile\AppData\LocalLow\Microsoft\CryptnetUrlCache\Content\57C8EDB95DF3F0AD4EE2DC2B8CFD4157	AA_v3-3.exe

System Location Discovery: System Language Discovery 1 TTPs 3 IoCs

Attempt gather information about the system language of a victim in order to infer the geographical location of that host.

discovery

System Language Discovery

T1614.001

description	ioc	Process
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	AA_v3-3.exe
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	AA_v3-3.exe
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	AA_v3-3.exe

Modifies data under HKEY_USERS 11 IoCs

description	ioc	Process
Set value (int)	\REGISTRY\USER\.DEFAULT\Software\Microsoft\Windows\CurrentVersion\Internet Settings\ZoneMap\UNCAsIntranet = "1"	AA_v3-3.exe
Key created	\REGISTRY\USER\.DEFAULT\SOFTWARE	AA_v3-3.exe
Key created	\REGISTRY\USER\.DEFAULT\Software\Microsoft\Windows\CurrentVersion\Internet Settings\ZoneMap\	AA_v3-3.exe
Set value (int)	\REGISTRY\USER\.DEFAULT\Software\Microsoft\Windows\CurrentVersion\Internet Settings\ZoneMap\AutoDetect = "0"	AA_v3-3.exe
Key created	\REGISTRY\USER\.DEFAULT\Software\Microsoft\Windows\CurrentVersion\WinTrust\Trust Providers\Software Publishing	AA_v3-3.exe
Key created	\REGISTRY\USER\.DEFAULT\SOFTWARE\Ammyy\Admin	AA_v3-3.exe
Key created	\REGISTRY\USER\.DEFAULT\Software\Ammyy	AA_v3-3.exe
Key created	\REGISTRY\USER\.DEFAULT\Software\Ammyy\Admin	AA_v3-3.exe
Set value (data)	\REGISTRY\USER\.DEFAULT\Software\Ammyy\Admin\hr3 = 108972b4d73b1bd13a85467d5799820b2f55b85ee36f2b1d3b90145d92d7317528c4a853de3789232263ff22d513a695a5672a0c07d8f43b62b79ea02dccb75ca000fb6abda0f42c0072ec	AA_v3-3.exe
Set value (int)	\REGISTRY\USER\.DEFAULT\Software\Microsoft\Windows\CurrentVersion\Internet Settings\ZoneMap\ProxyBypass = "1"	AA_v3-3.exe
Set value (int)	\REGISTRY\USER\.DEFAULT\Software\Microsoft\Windows\CurrentVersion\Internet Settings\ZoneMap\IntranetName = "1"	AA_v3-3.exe

Suspicious use of AdjustPrivilegeToken 8 IoCs

description	pid	Process
Token: SeBackupPrivilege	5020	AA_v3-3.exe
Token: SeRestorePrivilege	5020	AA_v3-3.exe
Token: SeBackupPrivilege	5020	AA_v3-3.exe
Token: SeRestorePrivilege	5020	AA_v3-3.exe
Token: SeBackupPrivilege	5020	AA_v3-3.exe
Token: SeRestorePrivilege	5020	AA_v3-3.exe
Token: SeBackupPrivilege	5020	AA_v3-3.exe
Token: SeRestorePrivilege	5020	AA_v3-3.exe

Suspicious use of FindShellTrayWindow 1 IoCs

pid	Process
5020	AA_v3-3.exe

Suspicious use of SendNotifyMessage 1 IoCs

pid	Process
5020	AA_v3-3.exe

Suspicious use of WriteProcessMemory 1 IoCs

description	pid	Process	procid_target
PID 3368 wrote to memory of 5020	3368	AA_v3-3.exe	81

C:\Users\Admin\AppData\Local\Temp\AA_v3-3.exe
"C:\Users\Admin\AppData\Local\Temp\AA_v3-3.exe"
1⤵
- Writes to the Master Boot Record (MBR)
- System Location Discovery: System Language Discovery
PID:5100

C:\Users\Admin\AppData\Local\Temp\AA_v3-3.exe
"C:\Users\Admin\AppData\Local\Temp\AA_v3-3.exe" -service -lunch
1⤵
- System Location Discovery: System Language Discovery
- Suspicious use of WriteProcessMemory
PID:3368
- C:\Users\Admin\AppData\Local\Temp\AA_v3-3.exe
  "C:\Users\Admin\AppData\Local\Temp\AA_v3-3.exe"
  2⤵
  - Writes to the Master Boot Record (MBR)
  - Drops file in System32 directory
  - System Location Discovery: System Language Discovery
  - Modifies data under HKEY_USERS
  - Suspicious use of AdjustPrivilegeToken
  - Suspicious use of FindShellTrayWindow
  - Suspicious use of SendNotifyMessage
  PID:5020

Network

MITRE ATT&CK Enterprise v16

Reconnaissance

Resource Development

Initial Access

Execution

Persistence

Pre-OS Boot

1

T1542

Bootkit

1

T1542.003

Privilege Escalation

Defense Evasion

Pre-OS Boot

1

T1542

Bootkit

1

T1542.003

Credential Access

Discovery

System Location Discovery

1

T1614

System Language Discovery

1

T1614.001

Lateral Movement

Collection

Command and Control

Exfiltration

Impact

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Downloads

settings3.bin

Path C:\ProgramData\AMMYY\settings3.bin
Size 334B
SHA256 b801bc5dedfb3c0c8cecdf1a857182a498410d90c10b8a5b754eda60a052bfae
MD5 918545ea2e7927cbe94ad64644ac73dc
SHA1 dfc47327011e5634cb02485221d99295440a327a
SHA512 76c52ffb4e4a36e6910ad3a0fe7e28f8ef3a71baaee660fdae97be0935a919c6f46f81365f5b77167706bd1a9e55e353e86f58e3cae6b5c74e22bf20b2187eb7
TLSH
T1CFE02D30BBB0943606CCD03F0991C810FF0CC29BB3BE1AE11F0E0049C0A1A2F6740188
MD5 SHA1 SHA512 TLSH

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Analysis

Sharing

General

Malware Config

Signatures

Processes

Network

MITRE ATT&CK Enterprise v16

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Downloads