guloader | af9cf5d0a4ce78114c88f09acd16e46a23d25367e71bb07e7d0d99c7c65203b5

Analysis

max time kernel
159s
max time network
160s
platform
windows10-2004_x64
resource
win10v2004-20230915-en
resource tags

arch:x64arch:x86image:win10v2004-20230915-enlocale:en-usos:windows10-2004-x64system
submitted
20/10/2023, 11:19

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General

Target
NEAS.b70f447d9b0a5543e6d81b3cd84512d0_JC.exe
Size 7.8MB
Sample231020-ne9gtsbf72
SHA256 af9cf5d0a4ce78114c88f09acd16e46a23d25367e71bb07e7d0d99c7c65203b5
MD5 b70f447d9b0a5543e6d81b3cd84512d0
SHA1 118bc275cbdba4078d6b22de45a408a69e856e90
SHA512 1fb0ba3ea8a9088bbeeb977d5e4f5f7b761d1f0810f1d92a5dd51d0d6456c4d4f4837f9d27078326ed1f36c8937fb5eba7ab00a853bfacddcd6c24ec2eb019eb
SSDEEP 196608:tRUSo7yWrHALwiVYBXRUaN+EARleCIyvy1/1m4O3UEhCCsf:tKSo7LALwiCBXRU07ARlJNv81m4TEhLg
MD5 SHA1 SHA512 SSDEEP

Score

10^/10

guloader downloader persistence

Malware Config

Extracted

Family

guloader

http://dzs2dejt1uilrv.xyz/gn.bin
http://8x7e48eixo3wrdd.pw/gn.bin
http://3st68j6afjjo6.website/gn.bin
http://y29cfu2aewql.host/gn.bin

xor.base64

Signatures

Guloader,Cloudeye
A shellcode based downloader first seen in 2020.
downloader guloader

Checks computer location settings 2 TTPs 1 IoCs

Looks up country code configured in the registry, likely geofence.

Query Registry

T1012

System Information Discovery

T1082

description	ioc	Process
Key value queried	\REGISTRY\USER\S-1-5-21-2890696111-2332180956-3312704074-1000\Control Panel\International\Geo\Nation	NEAS.b70f447d9b0a5543e6d81b3cd84512d0_JC.exe

Executes dropped EXE 1 IoCs

pid	Process
1388	flkp1o.exe

Loads dropped DLL 1 IoCs

pid	Process
840	flkp1o.exe

Adds Run key to start application 2 TTPs 2 IoCs

persistence

Registry Run Keys / Startup Folder

T1547.001

Modify Registry

T1112

description	ioc	Process
Set value (str)	\REGISTRY\USER\S-1-5-21-2890696111-2332180956-3312704074-1000\SOFTWARE\Microsoft\Windows\CurrentVersion\RunOnce\KFjh1n = "C:\\Users\\Admin\\Flkkpqs\\flkp1o.vbs"	NEAS.b70f447d9b0a5543e6d81b3cd84512d0_JC.exe
Set value (str)	\REGISTRY\USER\S-1-5-21-2890696111-2332180956-3312704074-1000\SOFTWARE\Microsoft\Windows\CurrentVersion\RunOnce\KFjh1n = "C:\\Users\\Admin\\Flkkpqs\\flkp1o.vbs"	flkp1o.exe

Suspicious use of NtSetInformationThreadHideFromDebugger 4 IoCs

pid	Process
4460	NEAS.b70f447d9b0a5543e6d81b3cd84512d0_JC.exe
1288	NEAS.b70f447d9b0a5543e6d81b3cd84512d0_JC.exe
1388	flkp1o.exe
840	flkp1o.exe

Suspicious use of SetThreadContext 2 IoCs

description	pid	Process	procid_target
PID 4460 set thread context of 1288	4460	NEAS.b70f447d9b0a5543e6d81b3cd84512d0_JC.exe	83
PID 1388 set thread context of 840	1388	flkp1o.exe	89

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

System Information Discovery
T1082

Suspicious behavior: MapViewOfSection 2 IoCs

pid	Process
4460	NEAS.b70f447d9b0a5543e6d81b3cd84512d0_JC.exe
1388	flkp1o.exe

Suspicious use of SetWindowsHookEx 2 IoCs

pid	Process
4460	NEAS.b70f447d9b0a5543e6d81b3cd84512d0_JC.exe
1388	flkp1o.exe

Suspicious use of WriteProcessMemory 11 IoCs

description	pid	Process	procid_target
PID 4460 wrote to memory of 1288	4460	NEAS.b70f447d9b0a5543e6d81b3cd84512d0_JC.exe	83
PID 4460 wrote to memory of 1288	4460	NEAS.b70f447d9b0a5543e6d81b3cd84512d0_JC.exe	83
PID 4460 wrote to memory of 1288	4460	NEAS.b70f447d9b0a5543e6d81b3cd84512d0_JC.exe	83
PID 4460 wrote to memory of 1288	4460	NEAS.b70f447d9b0a5543e6d81b3cd84512d0_JC.exe	83
PID 1288 wrote to memory of 1388	1288	NEAS.b70f447d9b0a5543e6d81b3cd84512d0_JC.exe	84
PID 1288 wrote to memory of 1388	1288	NEAS.b70f447d9b0a5543e6d81b3cd84512d0_JC.exe	84
PID 1288 wrote to memory of 1388	1288	NEAS.b70f447d9b0a5543e6d81b3cd84512d0_JC.exe	84
PID 1388 wrote to memory of 840	1388	flkp1o.exe	89
PID 1388 wrote to memory of 840	1388	flkp1o.exe	89
PID 1388 wrote to memory of 840	1388	flkp1o.exe	89
PID 1388 wrote to memory of 840	1388	flkp1o.exe	89

C:\Users\Admin\AppData\Local\Temp\NEAS.b70f447d9b0a5543e6d81b3cd84512d0_JC.exe
"C:\Users\Admin\AppData\Local\Temp\NEAS.b70f447d9b0a5543e6d81b3cd84512d0_JC.exe"
1⤵
- Adds Run key to start application
- Suspicious use of NtSetInformationThreadHideFromDebugger
- Suspicious use of SetThreadContext
- Suspicious behavior: MapViewOfSection
- Suspicious use of SetWindowsHookEx
- Suspicious use of WriteProcessMemory
PID:4460
- C:\Users\Admin\AppData\Local\Temp\NEAS.b70f447d9b0a5543e6d81b3cd84512d0_JC.exe
  "C:\Users\Admin\AppData\Local\Temp\NEAS.b70f447d9b0a5543e6d81b3cd84512d0_JC.exe"
  2⤵
  - Checks computer location settings
  - Suspicious use of NtSetInformationThreadHideFromDebugger
  - Suspicious use of WriteProcessMemory
  PID:1288
- - C:\Users\Admin\Flkkpqs\flkp1o.exe
    "C:\Users\Admin\Flkkpqs\flkp1o.exe"
    3⤵
    - Executes dropped EXE
    - Adds Run key to start application
    - Suspicious use of NtSetInformationThreadHideFromDebugger
    - Suspicious use of SetThreadContext
    - Suspicious behavior: MapViewOfSection
    - Suspicious use of SetWindowsHookEx
    - Suspicious use of WriteProcessMemory
    PID:1388
  - - C:\Users\Admin\Flkkpqs\flkp1o.exe
      "C:\Users\Admin\Flkkpqs\flkp1o.exe"
      4⤵
      Loads dropped DLL
      Suspicious use of NtSetInformationThreadHideFromDebugger
      PID:840

Network

MITRE ATT&CK Enterprise v15

Reconnaissance

Resource Development

Initial Access

Execution

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

Query Registry

T1012

System Information Discovery

T1082

Lateral Movement

Collection

Command and Control

Exfiltration

Impact

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Downloads

flkp1o.exe

Path C:\Users\Admin\Flkkpqs\flkp1o.exe
Size 7.8MB
SHA256 af9cf5d0a4ce78114c88f09acd16e46a23d25367e71bb07e7d0d99c7c65203b5
MD5 b70f447d9b0a5543e6d81b3cd84512d0
SHA1 118bc275cbdba4078d6b22de45a408a69e856e90
SHA512 1fb0ba3ea8a9088bbeeb977d5e4f5f7b761d1f0810f1d92a5dd51d0d6456c4d4f4837f9d27078326ed1f36c8937fb5eba7ab00a853bfacddcd6c24ec2eb019eb
SSDEEP 196608:tRUSo7yWrHALwiVYBXRUaN+EARleCIyvy1/1m4O3UEhCCsf:tKSo7LALwiCBXRU07ARlJNv81m4TEhLg
MD5 SHA1 SHA512 SSDEEP

Submit Download

flkp1o.exe

Path C:\Users\Admin\Flkkpqs\flkp1o.exe
Size 7.8MB
SHA256 af9cf5d0a4ce78114c88f09acd16e46a23d25367e71bb07e7d0d99c7c65203b5
MD5 b70f447d9b0a5543e6d81b3cd84512d0
SHA1 118bc275cbdba4078d6b22de45a408a69e856e90
SHA512 1fb0ba3ea8a9088bbeeb977d5e4f5f7b761d1f0810f1d92a5dd51d0d6456c4d4f4837f9d27078326ed1f36c8937fb5eba7ab00a853bfacddcd6c24ec2eb019eb
SSDEEP 196608:tRUSo7yWrHALwiVYBXRUaN+EARleCIyvy1/1m4O3UEhCCsf:tKSo7LALwiCBXRU07ARlJNv81m4TEhLg
MD5 SHA1 SHA512 SSDEEP

Submit Download

flkp1o.exe

Path C:\Users\Admin\Flkkpqs\flkp1o.exe
Size 7.8MB
SHA256 af9cf5d0a4ce78114c88f09acd16e46a23d25367e71bb07e7d0d99c7c65203b5
MD5 b70f447d9b0a5543e6d81b3cd84512d0
SHA1 118bc275cbdba4078d6b22de45a408a69e856e90
SHA512 1fb0ba3ea8a9088bbeeb977d5e4f5f7b761d1f0810f1d92a5dd51d0d6456c4d4f4837f9d27078326ed1f36c8937fb5eba7ab00a853bfacddcd6c24ec2eb019eb
SSDEEP 196608:tRUSo7yWrHALwiVYBXRUaN+EARleCIyvy1/1m4O3UEhCCsf:tKSo7LALwiCBXRU07ARlJNv81m4TEhLg
MD5 SHA1 SHA512 SSDEEP

Submit Download

flkp1o.exe

Path C:\Users\Admin\Flkkpqs\flkp1o.exe
Size 7.8MB
SHA256 af9cf5d0a4ce78114c88f09acd16e46a23d25367e71bb07e7d0d99c7c65203b5
MD5 b70f447d9b0a5543e6d81b3cd84512d0
SHA1 118bc275cbdba4078d6b22de45a408a69e856e90
SHA512 1fb0ba3ea8a9088bbeeb977d5e4f5f7b761d1f0810f1d92a5dd51d0d6456c4d4f4837f9d27078326ed1f36c8937fb5eba7ab00a853bfacddcd6c24ec2eb019eb
SSDEEP 196608:tRUSo7yWrHALwiVYBXRUaN+EARleCIyvy1/1m4O3UEhCCsf:tKSo7LALwiCBXRU07ARlJNv81m4TEhLg
MD5 SHA1 SHA512 SSDEEP

Submit Download

memory/840-30-0x0000000000560000-0x0000000000660000-memory.dmp

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memory/1288-6-0x0000000000560000-0x0000000000660000-memory.dmp

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memory/1288-8-0x0000000077B71000-0x0000000077C91000-memory.dmp

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memory/1288-21-0x0000000000560000-0x0000000000660000-memory.dmp

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memory/1288-4-0x0000000000400000-0x000000000055D000-memory.dmp

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memory/1388-24-0x0000000002940000-0x000000000294B000-memory.dmp

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memory/1388-25-0x0000000077B71000-0x0000000077C91000-memory.dmp

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memory/1388-29-0x0000000002940000-0x000000000294B000-memory.dmp

Download

memory/4460-9-0x0000000000D40000-0x0000000000D4B000-memory.dmp

Download

memory/4460-2-0x0000000000D40000-0x0000000000D4B000-memory.dmp

Download

memory/4460-3-0x0000000077B71000-0x0000000077C91000-memory.dmp

Download

Analysis

Sharing

General

Malware Config

Extracted

Signatures

Processes

Network

MITRE ATT&CK Enterprise v15

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Downloads