flyagent | 1a779acde1b26fa9a6e63a2977b5696d99180579c0c4d62300f47dae74f231cf

Analysis

max time kernel
59s
max time network
94s
platform
windows11-21h2_x64
resource
win11-20260130-en
resource tags

arch:x64arch:x86image:win11-20260130-enlocale:en-usos:windows11-21h2-x64systemwindows
submitted
23/04/2026, 11:15

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General

Target
1a779acde1b26fa9a6e63a2977b5696d99180579c0c4d62300f47dae74f231cf.exe
Size 1.3MB
Sample260423-nczvlsa151
SHA256 1a779acde1b26fa9a6e63a2977b5696d99180579c0c4d62300f47dae74f231cf
MD5 5ca87c104ea1c67f4ef8475546aed20a
SHA1 b1d0e5c9afdfead5adc2593d2e3a47e2bbd7f19f
SHA512 1569f409eef7b413740e3d8808e3f7ec987d5ca1a81fd526e592b856cfec8768313bd2bd0d8805509d2e371609ba8823020dcfee03b92e068d370eec9e24b083
SSDEEP 24576:WBS9qQEK6QywlBqH82QoXFkrzkmmlSgRDko0lG4Z8r7Qfd7iu5B:WZaClSFlG4ZM7QlVz
TLSH
T1C1557C13F692C0F1E61C227124FB6339BE7497450A71CACBE794DD791C32691ABA720E
MD5 SHA1 SHA512 SSDEEP TLSH

Score

10^/10

backdoor discovery flyagent

Malware Config

Signatures

Family: FlyAgent
FlyAgent is a backdoor written in C++.
backdoor flyagent

Detects FlyAgent Backdoor 3 IoCs

resource	yara_rule
behavioral2/memory/4128-10-0x0000000000400000-0x0000000000551000-memory.dmp	flyagent
behavioral2/memory/4128-12-0x0000000000400000-0x0000000000551000-memory.dmp	flyagent
behavioral2/files/0x001d00000002b1fd-13.dat	flyagent

Deletes itself 1 IoCs

pid	Process
1264	svchcst.exe

Executes dropped EXE 1 IoCs

pid	Process
1264	svchcst.exe

Enumerates physical storage devices 1 TTPs
Attempts to interact with connected storage/optical drive(s).

System Information Discovery
T1082

System Location Discovery: System Language Discovery 1 TTPs 6 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	WScript.exe
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	svchcst.exe
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	WScript.exe
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	WScript.exe
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	1a779acde1b26fa9a6e63a2977b5696d99180579c0c4d62300f47dae74f231cf.exe
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	WScript.exe

Modifies registry class 3 IoCs

description	ioc	Process
Key created	\REGISTRY\USER\S-1-5-21-2122505878-652277452-2375749442-1000_Classes\Local Settings	1a779acde1b26fa9a6e63a2977b5696d99180579c0c4d62300f47dae74f231cf.exe
Key created	\REGISTRY\MACHINE\SOFTWARE\Classes\WOW6432Node\CLSID\{1f3427c8-5c10-4210-aa03-2ee45287d668}\Instance\	WScript.exe
Key created	\REGISTRY\USER\S-1-5-21-2122505878-652277452-2375749442-1000_Classes\Local Settings	svchcst.exe

Suspicious behavior: EnumeratesProcesses 64 IoCs

pid	Process
4128	1a779acde1b26fa9a6e63a2977b5696d99180579c0c4d62300f47dae74f231cf.exe
4128	1a779acde1b26fa9a6e63a2977b5696d99180579c0c4d62300f47dae74f231cf.exe
4128	1a779acde1b26fa9a6e63a2977b5696d99180579c0c4d62300f47dae74f231cf.exe
4128	1a779acde1b26fa9a6e63a2977b5696d99180579c0c4d62300f47dae74f231cf.exe
1264	svchcst.exe
1264	svchcst.exe
1264	svchcst.exe
1264	svchcst.exe
1264	svchcst.exe
1264	svchcst.exe
1264	svchcst.exe
1264	svchcst.exe
1264	svchcst.exe
1264	svchcst.exe
1264	svchcst.exe
1264	svchcst.exe
1264	svchcst.exe
1264	svchcst.exe
1264	svchcst.exe
1264	svchcst.exe
1264	svchcst.exe
1264	svchcst.exe
1264	svchcst.exe
1264	svchcst.exe
1264	svchcst.exe
1264	svchcst.exe
1264	svchcst.exe
1264	svchcst.exe
1264	svchcst.exe
1264	svchcst.exe
1264	svchcst.exe
1264	svchcst.exe
1264	svchcst.exe
1264	svchcst.exe
1264	svchcst.exe
1264	svchcst.exe
1264	svchcst.exe
1264	svchcst.exe
1264	svchcst.exe
1264	svchcst.exe
1264	svchcst.exe
1264	svchcst.exe
1264	svchcst.exe
1264	svchcst.exe
1264	svchcst.exe
1264	svchcst.exe
1264	svchcst.exe
1264	svchcst.exe
1264	svchcst.exe
1264	svchcst.exe
1264	svchcst.exe
1264	svchcst.exe
1264	svchcst.exe
1264	svchcst.exe
1264	svchcst.exe
1264	svchcst.exe
1264	svchcst.exe
1264	svchcst.exe
1264	svchcst.exe
1264	svchcst.exe
1264	svchcst.exe
1264	svchcst.exe
1264	svchcst.exe
1264	svchcst.exe

Suspicious behavior: RenamesItself 1 IoCs

pid	Process
4128	1a779acde1b26fa9a6e63a2977b5696d99180579c0c4d62300f47dae74f231cf.exe

Suspicious use of SetWindowsHookEx 4 IoCs

pid	Process
4128	1a779acde1b26fa9a6e63a2977b5696d99180579c0c4d62300f47dae74f231cf.exe
4128	1a779acde1b26fa9a6e63a2977b5696d99180579c0c4d62300f47dae74f231cf.exe
1264	svchcst.exe
1264	svchcst.exe

Suspicious use of WriteProcessMemory 5 IoCs

description	pid	Process	procid_target
PID 4128 wrote to memory of 1160	4128	1a779acde1b26fa9a6e63a2977b5696d99180579c0c4d62300f47dae74f231cf.exe	80
PID 4128 wrote to memory of 1428	4128	1a779acde1b26fa9a6e63a2977b5696d99180579c0c4d62300f47dae74f231cf.exe	81
PID 1428 wrote to memory of 1264	1428	WScript.exe	83
PID 1264 wrote to memory of 3084	1264	svchcst.exe	84
PID 1264 wrote to memory of 484	1264	svchcst.exe	85

C:\Users\Admin\AppData\Local\Temp\1a779acde1b26fa9a6e63a2977b5696d99180579c0c4d62300f47dae74f231cf.exe
"C:\Users\Admin\AppData\Local\Temp\1a779acde1b26fa9a6e63a2977b5696d99180579c0c4d62300f47dae74f231cf.exe"
1⤵
- System Location Discovery: System Language Discovery
- Modifies registry class
- Suspicious behavior: EnumeratesProcesses
- Suspicious behavior: RenamesItself
- Suspicious use of SetWindowsHookEx
- Suspicious use of WriteProcessMemory
PID:4128
- C:\Windows\SysWOW64\WScript.exe
  "C:\Windows\System32\WScript.exe" "C:\Users\Admin\AppData\Roaming\Microsoft\VBS3.vbs"
  2⤵
  - System Location Discovery: System Language Discovery
  PID:1160
- C:\Windows\SysWOW64\WScript.exe
  "C:\Windows\System32\WScript.exe" "C:\Users\Admin\AppData\Roaming\Microsoft\VBS3.vbs"
  2⤵
  - System Location Discovery: System Language Discovery
  - Modifies registry class
  - Suspicious use of WriteProcessMemory
  PID:1428
- - C:\Users\Admin\AppData\Roaming\Microsoft\svchcst.exe
    "C:\Users\Admin\AppData\Roaming\Microsoft\svchcst.exe"
    3⤵
    - Deletes itself
    - Executes dropped EXE
    - System Location Discovery: System Language Discovery
    - Modifies registry class
    - Suspicious behavior: EnumeratesProcesses
    - Suspicious use of SetWindowsHookEx
    - Suspicious use of WriteProcessMemory
    PID:1264
  - - C:\Windows\SysWOW64\WScript.exe
      "C:\Windows\System32\WScript.exe" "C:\Users\Admin\AppData\Roaming\Microsoft\VBS3.vbs"
      4⤵
      System Location Discovery: System Language Discovery
      PID:3084
  - - C:\Windows\SysWOW64\WScript.exe
      "C:\Windows\System32\WScript.exe" "C:\Users\Admin\AppData\Roaming\Microsoft\VBS3.vbs"
      4⤵
      System Location Discovery: System Language Discovery
      PID:484

Network

MITRE ATT&CK Enterprise v16

Reconnaissance

Resource Development

Initial Access

Execution

Persistence

Privilege Escalation

Defense Evasion

Credential Access

Discovery

System Information Discovery

T1082

System Location Discovery

T1614

System Language Discovery

T1614.001

Lateral Movement

Collection

Command and Control

Exfiltration

Impact

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Downloads

Config.ini

Path C:\Users\Admin\AppData\Roaming\Microsoft\Config.ini
Size 92B
SHA256 44063c266686263f14cd2a83fee124fb3e61a9171a6aab69709464f49511011d
MD5 67b9b3e2ded7086f393ebbc36c5e7bca
SHA1 e6299d0450b9a92a18cc23b5704a2b475652c790
SHA512 826fbc9481f46b1ae3db828a665c55c349023caf563e6e8c17321f5f3af3e4c3914955db6f0eebfc6defe561315435d47310b4d0499ab9c2c85bb61264dedc09
MD5 SHA1 SHA512

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VBS3.vbs

Path C:\Users\Admin\AppData\Roaming\Microsoft\VBS3.vbs
Size 696B
SHA256 fc93c94af2daa9c8b70b9f6104f613a1cf0ac39bf1856542a3dbb6f828d2bee6
MD5 30eafc82ac9962314c98d54ef2588957
SHA1 3bf1e1f24264448ba2688366b10b083c808e1e7a
SHA512 5cd90109e61e06fda91874fd3cd28d83b42b6e586446ce99cf69a611f0015f56010937fadca4accef57ab47b5bca54b4171479a9a989ab5b1a015d491f985fb5
TLSH
T13A019900DD5C8258503553B62432A44FF7EA1553A303ACE8B899D0B52F7076C9CB4A32
MD5 SHA1 SHA512 TLSH

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VBS3.vbs

Path C:\Users\Admin\AppData\Roaming\Microsoft\VBS3.vbs
Size 753B
SHA256 e8f63e5193b3800ba028b903f8dededaf06c4c2bbf5a6c10effa78ee988fa1f3
MD5 4833cec2be8809c37c4b40dc4ab3c693
SHA1 fc5be8aff3d45e5f109c95b38423cc73f66b6bcc
SHA512 1ae0fa21fd1afa06d92c1426c9822abac7911db1e52794ca2b166f43080732f5fa67eb6c2ff59a47637fbc46c35ebe0674e73fdf59b1a6131473c3299675f4d0
TLSH
T19101C010DD5C825C9035577A2432F44EF7DE1553A303ACD8789AC1652F70768ADB5A33
MD5 SHA1 SHA512 TLSH

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svchcst.exe

Path C:\Users\Admin\AppData\Roaming\Microsoft\svchcst.exe
Size 1.3MB
SHA256 4890220a873bceb105ea5a8a70c1a7d0af980bc319b7afcc32cb06be6a3de440
MD5 fddaae75f8e7afd0b590078af863421b
SHA1 406886897ab9b90a46066d77249f5b1528d20012
SHA512 d1e4a2449ea8df2373298990dd9438c12dc23eead4eb11a0c37de1e1cf46f8426de2ac31df495df4238ba1b7575f06fbc065f6b9d5675712b599b827b8699906
SSDEEP 24576:WBS9qQEK6QywlBqH82QoXFkrzkmmlSgRDko0lG4Z8r7Qfd7iu5F:WZaClSFlG4ZM7QlVH
TLSH
T1BD557C13F692C0F1E61C227124FB6339BE7497450A71CACBE794DD791C32691ABA720E
MD5 SHA1 SHA512 SSDEEP TLSH

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memory/4128-10-0x0000000000400000-0x0000000000551000-memory.dmp

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memory/4128-12-0x0000000000400000-0x0000000000551000-memory.dmp

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