flyagent | dc83e398b20b3894b0620679f73e87bc14529f15fb71864cc2e14bc52ae88a01

Analysis

max time kernel
32s
max time network
153s
platform
windows11-ltsc_2024_x64
resource
win11ltsc2024-20260709-en
resource tags

arch:x64arch:x86image:win11ltsc2024-20260709-enlocale:en-usos:windows11-ltsc_2024-x64systemwindows
submitted
03/08/2026, 16:14

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General

Target
dc83e398b20b3894b0620679f73e87bc14529f15fb71864cc2e14bc52ae88a01.exe
Size 1.2MB
Sample260803-tp1kkaca44
SHA256 dc83e398b20b3894b0620679f73e87bc14529f15fb71864cc2e14bc52ae88a01
MD5 7eee39a7d254c757230e18964fd5834b
SHA1 f5eba3cd25e5a398f6091dd15ba20c04073106a2
SHA512 d46b0314a2cd32af995052f6d53a3f3e9c864572097f15b6a8182f11b2eece7b02824fea483a8ad83fc8f16b266d1f4c6c825fb812c4e6c616b3a05bdde5c762
SSDEEP 24576:BjtC6RxD1hMbipXcvvX8wirRtcuO2hl5GdYquD+oHlG4Xt4JgPJCj8zDVpJEI:BjtxttI2vquflG4XtggPJMjI
TLSH
T15B45AE23F18280F2C728113118FB1735FEB897565A70CA9BE7D4DE781D63251AB6B21E
MD5 SHA1 SHA512 SSDEEP TLSH

Score

10^/10

backdoor discovery execution flyagent persistence privilege_escalation

Malware Config

Signatures

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

Detects FlyAgent Backdoor 9 IoCs

resource	yara_rule
behavioral2/memory/2348-0-0x0000000000400000-0x0000000000576000-memory.dmp	flyagent
behavioral2/files/0x000c00000001c66a-22.dat	flyagent
behavioral2/memory/2348-30-0x0000000000400000-0x0000000000576000-memory.dmp	flyagent
behavioral2/memory/2348-33-0x0000000000400000-0x0000000000576000-memory.dmp	flyagent
behavioral2/memory/2348-36-0x0000000000400000-0x0000000000576000-memory.dmp	flyagent
behavioral2/memory/2348-40-0x0000000000400000-0x0000000000576000-memory.dmp	flyagent
behavioral2/memory/2348-43-0x0000000000400000-0x0000000000576000-memory.dmp	flyagent
behavioral2/memory/2348-46-0x0000000000400000-0x0000000000576000-memory.dmp	flyagent
behavioral2/memory/2348-49-0x0000000000400000-0x0000000000576000-memory.dmp	flyagent

Creates a file in the Startup directory 1 TTPs 1 IoCs

A file was written to a Windows startup folder. Files in these directories are executed automatically when a user logs on or an application initializes.

persistence privilege_escalation

Registry Run Keys / Startup Folder

T1547.001

description	ioc	Process
File created	C:\Users\Admin\AppData\Roaming\Microsoft\Windows\Start Menu\Programs\Startup\win.lnk	dc83e398b20b3894b0620679f73e87bc14529f15fb71864cc2e14bc52ae88a01.exe

Executes dropped EXE 1 IoCs

pid	Process
5600	svchcst.exe

Adds Run key to start application 2 TTPs 1 IoCs

persistence

Registry Run Keys / Startup Folder

T1547.001

Modify Registry

T1112

description	ioc	Process
Set value (str)	\REGISTRY\MACHINE\SOFTWARE\WOW6432Node\Microsoft\Windows\CurrentVersion\Run\360safo = "C:\\Users\\Admin\\AppData\\Roaming\\Microsoft\\svchcst.exe"	dc83e398b20b3894b0620679f73e87bc14529f15fb71864cc2e14bc52ae88a01.exe

Executes a VBScript file via the Windows Script Host. 1 TTPs 3 IoCs

execution

Visual Basic

T1059.005

pid	Process
4396	WScript.exe
4132	WScript.exe
4992	WScript.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 5 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	dc83e398b20b3894b0620679f73e87bc14529f15fb71864cc2e14bc52ae88a01.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	WScript.exe
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	svchcst.exe

Modifies registry class 1 IoCs

description	ioc	Process
Key created	\REGISTRY\USER\S-1-5-21-1014449518-1831897916-4205727055-1000_Classes\Local Settings	dc83e398b20b3894b0620679f73e87bc14529f15fb71864cc2e14bc52ae88a01.exe

Suspicious behavior: EnumeratesProcesses 8 IoCs

pid	Process
2348	dc83e398b20b3894b0620679f73e87bc14529f15fb71864cc2e14bc52ae88a01.exe
2348	dc83e398b20b3894b0620679f73e87bc14529f15fb71864cc2e14bc52ae88a01.exe
2348	dc83e398b20b3894b0620679f73e87bc14529f15fb71864cc2e14bc52ae88a01.exe
2348	dc83e398b20b3894b0620679f73e87bc14529f15fb71864cc2e14bc52ae88a01.exe
2348	dc83e398b20b3894b0620679f73e87bc14529f15fb71864cc2e14bc52ae88a01.exe
2348	dc83e398b20b3894b0620679f73e87bc14529f15fb71864cc2e14bc52ae88a01.exe
2348	dc83e398b20b3894b0620679f73e87bc14529f15fb71864cc2e14bc52ae88a01.exe
2348	dc83e398b20b3894b0620679f73e87bc14529f15fb71864cc2e14bc52ae88a01.exe

Suspicious behavior: RenamesItself 1 IoCs

pid	Process
2348	dc83e398b20b3894b0620679f73e87bc14529f15fb71864cc2e14bc52ae88a01.exe

Suspicious use of SetWindowsHookEx 4 IoCs

pid	Process
2348	dc83e398b20b3894b0620679f73e87bc14529f15fb71864cc2e14bc52ae88a01.exe
2348	dc83e398b20b3894b0620679f73e87bc14529f15fb71864cc2e14bc52ae88a01.exe
5600	svchcst.exe
5600	svchcst.exe

Suspicious use of WriteProcessMemory 3 IoCs

description	pid	Process	procid_target
PID 2348 wrote to memory of 4396	2348	dc83e398b20b3894b0620679f73e87bc14529f15fb71864cc2e14bc52ae88a01.exe	90
PID 2348 wrote to memory of 4132	2348	dc83e398b20b3894b0620679f73e87bc14529f15fb71864cc2e14bc52ae88a01.exe	91
PID 2348 wrote to memory of 4992	2348	dc83e398b20b3894b0620679f73e87bc14529f15fb71864cc2e14bc52ae88a01.exe	92

C:\Users\Admin\AppData\Local\Temp\dc83e398b20b3894b0620679f73e87bc14529f15fb71864cc2e14bc52ae88a01.exe
"C:\Users\Admin\AppData\Local\Temp\dc83e398b20b3894b0620679f73e87bc14529f15fb71864cc2e14bc52ae88a01.exe"
1⤵
- Creates a file in the Startup directory
- Adds Run key to start application
- System Location Discovery: System Language Discovery
- Modifies registry class
- Suspicious behavior: EnumeratesProcesses
- Suspicious behavior: RenamesItself
- Suspicious use of SetWindowsHookEx
- Suspicious use of WriteProcessMemory
PID:2348
- C:\Windows\SysWOW64\WScript.exe
  "C:\Windows\System32\WScript.exe" "C:\Users\Admin\AppData\Roaming\Microsoft\VBS3.vbs"
  2⤵
  - Executes a VBScript file via the Windows Script Host.
  - System Location Discovery: System Language Discovery
  PID:4396
- C:\Windows\SysWOW64\WScript.exe
  "C:\Windows\System32\WScript.exe" "C:\Users\Admin\AppData\Roaming\Microsoft\VBS3.vbs"
  2⤵
  - Executes a VBScript file via the Windows Script Host.
  - System Location Discovery: System Language Discovery
  PID:4132
- C:\Windows\SysWOW64\WScript.exe
  "C:\Windows\System32\WScript.exe" "C:\Users\Admin\AppData\Roaming\Microsoft\VBS3.vbs"
  2⤵
  - Executes a VBScript file via the Windows Script Host.
  - System Location Discovery: System Language Discovery
  PID:4992

C:\Users\Admin\AppData\Roaming\Microsoft\svchcst.exe
C:\Users\Admin\AppData\Roaming\Microsoft\svchcst.exe
1⤵
- Executes dropped EXE
- System Location Discovery: System Language Discovery
- Suspicious use of SetWindowsHookEx
PID:5600

Network

MITRE ATT&CK Enterprise v16

Reconnaissance

Resource Development

Initial Access

Execution

Command and Scripting Interpreter

T1059

Visual Basic

T1059.005

Persistence

Boot or Logon Autostart Execution

T1547

Registry Run Keys / Startup Folder

T1547.001

Privilege Escalation

Boot or Logon Autostart Execution

T1547

Registry Run Keys / Startup Folder

T1547.001

Defense Evasion

Modify Registry

T1112

Credential Access

Discovery

System Information Discovery

T1082

System Location Discovery

T1614

System Language Discovery

T1614.001

Lateral Movement

Collection

Command and Control

Exfiltration

Impact

Replay Monitor

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Downloads

Config.ini

Path C:\Users\Admin\AppData\Roaming\Microsoft\Config.ini
Size 92B
SHA256 7bfcc2f0d3c25f895eac6676d4ce9f16713149206980fb97f4aa4272e82ed2b8
MD5 616ffedca89dfde66c19c781ec4933c5
SHA1 05d28ae3243fbaed0b925f218c1c7c71a5dbbca1
SHA512 8a6fa82b124203512e1ed3d4ad037df7a3c2ec3d8f1db6b5d4e591ccb08c1c44b2a8589d769697c0f1ea35e711b38eb8fbab3fa3a24be99d099782b9c6c25a8f
MD5 SHA1 SHA512

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VBS3.vbs

Path C:\Users\Admin\AppData\Roaming\Microsoft\VBS3.vbs
Size 753B
SHA256 c325609081daefe7d0885e4f0537711f73d0759e5e4fc913361763f6a8feebbb
MD5 1dc8c943c65bf1c2ec352c9a5002001f
SHA1 a81ee42a064c7bc1f259b9eda0495a395e639c4c
SHA512 996c2921497ed82b4ca0a2284058577d4201d737bae385c22709889ce40abe10b0ab59bc0f2a3b1d64091dea63e9af7a7edcf729c9a6f3779304a62b141dae1f
TLSH
T1BB01CB10ED5CC25C603557B52432E80EF7EF1453A303ACD87899E1A52FB066C8CB5A33
MD5 SHA1 SHA512 TLSH

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svchcst.exe

Path C:\Users\Admin\AppData\Roaming\Microsoft\svchcst.exe
Size 1.2MB
SHA256 22120eed523e48c2b0f802cf05636680d28bdc869c534e838df5a5a7a33653ff
MD5 8c1ed310e2be41c24c3b295a20247e9a
SHA1 d390ac01dc0f6c3876181a16f3d2e680a689f142
SHA512 6a1ebe867a9a191eba7f9c36c1840a452fea5a3e447f4a6bbd3aa341e05ee6ba2304fad5f141870aa2dcb35b85b247cb8f0e911ac524de590b986069a1d31ea6
SSDEEP 24576:BjtC6RxD1hMbipXcvvX8wirRtcuO2hl5GdYquD+oHlG4Xt4JgPJCj8zDVpJES:BjtxttI2vquflG4XtggPJMjS
TLSH
T1C245AE23F18280F2C728113118FB1735FEB897565A70CA9BE7D4DE781D63251AB6B21E
MD5 SHA1 SHA512 SSDEEP TLSH

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memory/2348-0-0x0000000000400000-0x0000000000576000-memory.dmp

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memory/2348-30-0x0000000000400000-0x0000000000576000-memory.dmp

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memory/2348-33-0x0000000000400000-0x0000000000576000-memory.dmp

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memory/2348-36-0x0000000000400000-0x0000000000576000-memory.dmp

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memory/2348-40-0x0000000000400000-0x0000000000576000-memory.dmp

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memory/2348-43-0x0000000000400000-0x0000000000576000-memory.dmp

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memory/2348-46-0x0000000000400000-0x0000000000576000-memory.dmp

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memory/2348-49-0x0000000000400000-0x0000000000576000-memory.dmp

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