flawedammyy | 5fc600351bade74c2791fc526bca6bb606355cc65e5253f7f791254db58ee7fa

General

Target
AA_v3.exe
Size 778KB
Sample260915-hwqs6atalb
SHA256 5fc600351bade74c2791fc526bca6bb606355cc65e5253f7f791254db58ee7fa
MD5 121e1634bf18768802427f0a13f039a9
SHA1 8868654ba10fb4c9a7bd882d1f947f4fd51e988e
SHA512 393df326af3109fe701b579b73f42f7a9b155bb4df6ea7049ad3ae9fdd03446576b887a99eb7a0d59949a7a63367e223253448b6f1a0ebeaf358fa2873dcc200
SSDEEP 12288:hSX+EvrCA3FNIs34Zk1L1ZSNlm3Spsal6lbRtMuStGKcsCSqcl90Va1ugp:2FNN4Zk1LTclm3e1kbRtyGKcpHcl517p
TLSH
T1AF059D523AC5817EC1720231C9996BB6FAF6FE554E768D432388FE6C4E79D00DA13728
MD5 SHA1 SHA512 SSDEEP TLSH

Score

10^/10

discovery flawedammyy trojan

Malware Config

Signatures

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

Drops file in System32 directory 12 IoCs

description	ioc	Process
File opened for modification	C:\Windows\SysWOW64\config\systemprofile\AppData\LocalLow\Microsoft\CryptnetUrlCache\Content	AA_v3.exe
File opened for modification	C:\Windows\SysWOW64\config\systemprofile\AppData\LocalLow\Microsoft\CryptnetUrlCache\Content\57C8EDB95DF3F0AD4EE2DC2B8CFD4157	AA_v3.exe
File opened for modification	C:\Windows\SysWOW64\config\systemprofile\AppData\LocalLow\Microsoft\CryptnetUrlCache\MetaData\5623F5352DED358E7C51B0E1373F776C	AA_v3.exe
File opened for modification	C:\Windows\SysWOW64\config\systemprofile\AppData\LocalLow\Microsoft\CryptnetUrlCache\MetaData\103621DE9CD5414CC2538780B4B75751	AA_v3.exe
File opened for modification	C:\Windows\SysWOW64\config\systemprofile\AppData\LocalLow\Microsoft\CryptnetUrlCache\Content\103621DE9CD5414CC2538780B4B75751	AA_v3.exe
File opened for modification	C:\Windows\SysWOW64\config\systemprofile\AppData\LocalLow\Microsoft\CryptnetUrlCache\MetaData\F15827BEC5BABE89C21DCDAE77464BF1	AA_v3.exe
File opened for modification	C:\Windows\SysWOW64\config\systemprofile\AppData\LocalLow\Microsoft\CryptnetUrlCache\Content\F15827BEC5BABE89C21DCDAE77464BF1	AA_v3.exe
File opened for modification	C:\Windows\SysWOW64\config\systemprofile\AppData\LocalLow\Microsoft\CryptnetUrlCache\Content\5623F5352DED358E7C51B0E1373F776C	AA_v3.exe
File opened for modification	C:\Windows\SysWOW64\config\systemprofile\AppData\LocalLow\Microsoft	AA_v3.exe
File opened for modification	C:\Windows\SysWOW64\config\systemprofile\AppData\LocalLow\Microsoft\CryptnetUrlCache	AA_v3.exe
File opened for modification	C:\Windows\SysWOW64\config\systemprofile\AppData\LocalLow\Microsoft\CryptnetUrlCache\MetaData	AA_v3.exe
File opened for modification	C:\Windows\SysWOW64\config\systemprofile\AppData\LocalLow\Microsoft\CryptnetUrlCache\MetaData\57C8EDB95DF3F0AD4EE2DC2B8CFD4157	AA_v3.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.exe
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	AA_v3.exe
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	AA_v3.exe

Modifies data under HKEY_USERS 11 IoCs

description	ioc	Process
Key created	\REGISTRY\USER\.DEFAULT\SOFTWARE	AA_v3.exe
Set value (data)	\REGISTRY\USER\.DEFAULT\Software\Ammyy\Admin\hr3 = b9a53c6bcaf35477d973ba20b206a4ccdb206de6109cf1e5c563843271e84e8592b24b776b0a7d2baaae47b5a5d66050f18cbc257b71388e498293ccf440e8578789d9eeb50adcaaed77ea	AA_v3.exe
Key created	\REGISTRY\USER\.DEFAULT\Software\Microsoft\Windows\CurrentVersion\Internet Settings\ZoneMap\	AA_v3.exe
Set value (int)	\REGISTRY\USER\.DEFAULT\Software\Microsoft\Windows\CurrentVersion\Internet Settings\ZoneMap\ProxyBypass = "1"	AA_v3.exe
Set value (int)	\REGISTRY\USER\.DEFAULT\Software\Microsoft\Windows\CurrentVersion\Internet Settings\ZoneMap\AutoDetect = "0"	AA_v3.exe
Key created	\REGISTRY\USER\.DEFAULT\Software\Microsoft\Windows\CurrentVersion\WinTrust\Trust Providers\Software Publishing	AA_v3.exe
Key created	\REGISTRY\USER\.DEFAULT\SOFTWARE\Ammyy\Admin	AA_v3.exe
Key created	\REGISTRY\USER\.DEFAULT\Software\Ammyy	AA_v3.exe
Key created	\REGISTRY\USER\.DEFAULT\Software\Ammyy\Admin	AA_v3.exe
Set value (int)	\REGISTRY\USER\.DEFAULT\Software\Microsoft\Windows\CurrentVersion\Internet Settings\ZoneMap\IntranetName = "1"	AA_v3.exe
Set value (int)	\REGISTRY\USER\.DEFAULT\Software\Microsoft\Windows\CurrentVersion\Internet Settings\ZoneMap\UNCAsIntranet = "1"	AA_v3.exe

Suspicious use of FindShellTrayWindow 1 IoCs

pid	Process
1292	AA_v3.exe

Suspicious use of SendNotifyMessage 1 IoCs

pid	Process
1292	AA_v3.exe

Suspicious use of WriteProcessMemory 1 IoCs

description	pid	Process	procid_target
PID 4956 wrote to memory of 1292	4956	AA_v3.exe	87

C:\Users\Admin\AppData\Local\Temp\AA_v3.exe
"C:\Users\Admin\AppData\Local\Temp\AA_v3.exe"
1⤵
- System Location Discovery: System Language Discovery
PID:1784

C:\Users\Admin\AppData\Local\Temp\AA_v3.exe
"C:\Users\Admin\AppData\Local\Temp\AA_v3.exe" -service -lunch
1⤵
- System Location Discovery: System Language Discovery
- Suspicious use of WriteProcessMemory
PID:4956
- C:\Users\Admin\AppData\Local\Temp\AA_v3.exe
  "C:\Users\Admin\AppData\Local\Temp\AA_v3.exe"
  2⤵
  - Drops file in System32 directory
  - System Location Discovery: System Language Discovery
  - Modifies data under HKEY_USERS
  - Suspicious use of FindShellTrayWindow
  - Suspicious use of SendNotifyMessage
  PID:1292

Network

MITRE ATT&CK Enterprise v16

Reconnaissance

Resource Development

Initial Access

Execution

Persistence

Privilege Escalation

Defense Evasion

Credential Access

Discovery

System Location Discovery

1

T1614

System Language Discovery

1

T1614.001

Lateral Movement

Collection

Command and Control

Exfiltration

Impact

Replay Monitor

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Downloads

settings3.bin

Path C:\ProgramData\AMMYY\settings3.bin
Size 282B
SHA256 b6b033b71d3f7f92986e32a61b3244b9856e82a9c3d233696a0dfa29a517106f
MD5 ac7221c691ef0a93dbbb5bee6efcb7ec
SHA1 54f197fef16badefb4bf0d7339f6bd1099e505da
SHA512 226299ab1b7b388473163f4fecc41d536755586b4c275475128c5e5946554cd9ca69df223469130d85516f2ac2330a2cb35dec2879355ea0186b63d8429dcd6b
TLSH
T10ED0EB30C090CBD3AE0BC138FA2081818166C8A1B6FBE0415E2FC300418D2045192CCC
MD5 SHA1 SHA512 TLSH

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