Malware Analysis Report

2025-08-05 14:07

Sample ID 230805-p42zqadh6x
Target 6f61121924dbe1b34c6af8af8ee78528ca9d839856c9fd8ffe8a3a2e48cae506exe_JC.exe
SHA256 6f61121924dbe1b34c6af8af8ee78528ca9d839856c9fd8ffe8a3a2e48cae506
Tags
guloader downloader
score
10/10

Table of Contents

Analysis Overview

MITRE ATT&CK

Enterprise Matrix V15

Analysis: static1

Detonation Overview

Signatures

Analysis: behavioral1

Detonation Overview

Command Line

Signatures

Processes

Network

Files

Analysis: behavioral2

Detonation Overview

Command Line

Signatures

Processes

Network

Files

Analysis Overview

score
10/10

SHA256

6f61121924dbe1b34c6af8af8ee78528ca9d839856c9fd8ffe8a3a2e48cae506

Threat Level: Known bad

The file 6f61121924dbe1b34c6af8af8ee78528ca9d839856c9fd8ffe8a3a2e48cae506exe_JC.exe was found to be: Known bad.

Malicious Activity Summary

guloader downloader

Guloader,Cloudeye

Loads dropped DLL

Checks QEMU agent file

Legitimate hosting services abused for malware hosting/C2

Suspicious use of NtCreateThreadExHideFromDebugger

Drops file in System32 directory

Suspicious use of NtSetInformationThreadHideFromDebugger

Suspicious use of SetThreadContext

Drops file in Windows directory

Drops file in Program Files directory

Enumerates physical storage devices

Suspicious use of WriteProcessMemory

Suspicious behavior: MapViewOfSection

Suspicious behavior: EnumeratesProcesses

MITRE ATT&CK

Analysis: static1

Detonation Overview

Reported

2023-08-05 12:53

Signatures

N/A

Analysis: behavioral1

Detonation Overview

Submitted

2023-08-05 12:53

Reported

2023-08-05 12:56

Platform

win7-20230712-en

Max time kernel

145s

Max time network

134s

Command Line

"C:\Users\Admin\AppData\Local\Temp\6f61121924dbe1b34c6af8af8ee78528ca9d839856c9fd8ffe8a3a2e48cae506exe_JC.exe"

Signatures

Guloader,Cloudeye

downloader guloader

Checks QEMU agent file

Description Indicator Process Target
File opened (read-only) C:\Program Files\Qemu-ga\qemu-ga.exe C:\Users\Admin\AppData\Local\Temp\6f61121924dbe1b34c6af8af8ee78528ca9d839856c9fd8ffe8a3a2e48cae506exe_JC.exe N/A
File opened (read-only) C:\Program Files\Qemu-ga\qemu-ga.exe C:\Users\Admin\AppData\Local\Temp\6f61121924dbe1b34c6af8af8ee78528ca9d839856c9fd8ffe8a3a2e48cae506exe_JC.exe N/A

Legitimate hosting services abused for malware hosting/C2

Drops file in System32 directory

Description Indicator Process Target
File opened for modification C:\Windows\SysWOW64\Fimbrethil155\crabbing.ant C:\Users\Admin\AppData\Local\Temp\6f61121924dbe1b34c6af8af8ee78528ca9d839856c9fd8ffe8a3a2e48cae506exe_JC.exe N/A

Suspicious use of NtCreateThreadExHideFromDebugger

Description Indicator Process Target
N/A N/A C:\Users\Admin\AppData\Local\Temp\6f61121924dbe1b34c6af8af8ee78528ca9d839856c9fd8ffe8a3a2e48cae506exe_JC.exe N/A

Drops file in Program Files directory

Description Indicator Process Target
File opened for modification C:\Program Files (x86)\Chad\ndplaner\komtessernes.ini C:\Users\Admin\AppData\Local\Temp\6f61121924dbe1b34c6af8af8ee78528ca9d839856c9fd8ffe8a3a2e48cae506exe_JC.exe N/A

Drops file in Windows directory

Description Indicator Process Target
File opened for modification C:\Windows\resources\honnrmarch.han C:\Users\Admin\AppData\Local\Temp\6f61121924dbe1b34c6af8af8ee78528ca9d839856c9fd8ffe8a3a2e48cae506exe_JC.exe N/A

Enumerates physical storage devices

Suspicious behavior: EnumeratesProcesses

Description Indicator Process Target
N/A N/A C:\Users\Admin\AppData\Local\Temp\6f61121924dbe1b34c6af8af8ee78528ca9d839856c9fd8ffe8a3a2e48cae506exe_JC.exe N/A

Suspicious behavior: MapViewOfSection

Description Indicator Process Target
N/A N/A C:\Users\Admin\AppData\Local\Temp\6f61121924dbe1b34c6af8af8ee78528ca9d839856c9fd8ffe8a3a2e48cae506exe_JC.exe N/A

Processes

C:\Users\Admin\AppData\Local\Temp\6f61121924dbe1b34c6af8af8ee78528ca9d839856c9fd8ffe8a3a2e48cae506exe_JC.exe

"C:\Users\Admin\AppData\Local\Temp\6f61121924dbe1b34c6af8af8ee78528ca9d839856c9fd8ffe8a3a2e48cae506exe_JC.exe"

C:\Users\Admin\AppData\Local\Temp\6f61121924dbe1b34c6af8af8ee78528ca9d839856c9fd8ffe8a3a2e48cae506exe_JC.exe

"C:\Users\Admin\AppData\Local\Temp\6f61121924dbe1b34c6af8af8ee78528ca9d839856c9fd8ffe8a3a2e48cae506exe_JC.exe"

Network

Country Destination Domain Proto
US 8.8.8.8:53 drive.google.com udp
NL 172.217.168.238:443 drive.google.com tcp
US 8.8.8.8:53 doc-08-c4-docs.googleusercontent.com udp
NL 142.251.36.1:443 doc-08-c4-docs.googleusercontent.com tcp

Files

\Users\Admin\AppData\Local\Temp\nst7725.tmp\System.dll

MD5 75ed96254fbf894e42058062b4b4f0d1
SHA1 996503f1383b49021eb3427bc28d13b5bbd11977
SHA256 a632d74332b3f08f834c732a103dafeb09a540823a2217ca7f49159755e8f1d7
SHA512 58174896db81d481947b8745dafe3a02c150f3938bb4543256e8cce1145154e016d481df9fe68dac6d48407c62cbe20753320ebd5fe5e84806d07ce78e0eb0c4

memory/1196-65-0x00000000777E0000-0x0000000077989000-memory.dmp

memory/1196-66-0x00000000779D0000-0x0000000077AA6000-memory.dmp

memory/1196-67-0x00000000751A0000-0x00000000751A6000-memory.dmp

memory/3008-68-0x0000000000400000-0x0000000001462000-memory.dmp

memory/3008-69-0x00000000777E0000-0x0000000077989000-memory.dmp

memory/3008-70-0x0000000000400000-0x0000000001462000-memory.dmp

memory/3008-92-0x0000000000400000-0x0000000001462000-memory.dmp

memory/3008-93-0x0000000001470000-0x0000000004889000-memory.dmp

memory/3008-94-0x0000000000400000-0x0000000001462000-memory.dmp

memory/3008-96-0x0000000034D50000-0x0000000035053000-memory.dmp

memory/3008-95-0x0000000001470000-0x0000000004889000-memory.dmp

Analysis: behavioral2

Detonation Overview

Submitted

2023-08-05 12:53

Reported

2023-08-05 12:56

Platform

win10v2004-20230703-en

Max time kernel

147s

Max time network

131s

Command Line

"C:\Users\Admin\AppData\Local\Temp\6f61121924dbe1b34c6af8af8ee78528ca9d839856c9fd8ffe8a3a2e48cae506exe_JC.exe"

Signatures

Checks QEMU agent file

Description Indicator Process Target
File opened (read-only) C:\Program Files\Qemu-ga\qemu-ga.exe C:\Users\Admin\AppData\Local\Temp\6f61121924dbe1b34c6af8af8ee78528ca9d839856c9fd8ffe8a3a2e48cae506exe_JC.exe N/A
File opened (read-only) C:\Program Files\Qemu-ga\qemu-ga.exe C:\Users\Admin\AppData\Local\Temp\6f61121924dbe1b34c6af8af8ee78528ca9d839856c9fd8ffe8a3a2e48cae506exe_JC.exe N/A

Legitimate hosting services abused for malware hosting/C2

Drops file in System32 directory

Description Indicator Process Target
File opened for modification C:\Windows\SysWOW64\Fimbrethil155\crabbing.ant C:\Users\Admin\AppData\Local\Temp\6f61121924dbe1b34c6af8af8ee78528ca9d839856c9fd8ffe8a3a2e48cae506exe_JC.exe N/A

Suspicious use of NtCreateThreadExHideFromDebugger

Description Indicator Process Target
N/A N/A C:\Users\Admin\AppData\Local\Temp\6f61121924dbe1b34c6af8af8ee78528ca9d839856c9fd8ffe8a3a2e48cae506exe_JC.exe N/A

Drops file in Program Files directory

Description Indicator Process Target
File opened for modification C:\Program Files (x86)\Chad\ndplaner\komtessernes.ini C:\Users\Admin\AppData\Local\Temp\6f61121924dbe1b34c6af8af8ee78528ca9d839856c9fd8ffe8a3a2e48cae506exe_JC.exe N/A

Drops file in Windows directory

Description Indicator Process Target
File opened for modification C:\Windows\resources\honnrmarch.han C:\Users\Admin\AppData\Local\Temp\6f61121924dbe1b34c6af8af8ee78528ca9d839856c9fd8ffe8a3a2e48cae506exe_JC.exe N/A

Enumerates physical storage devices

Suspicious behavior: MapViewOfSection

Description Indicator Process Target
N/A N/A C:\Users\Admin\AppData\Local\Temp\6f61121924dbe1b34c6af8af8ee78528ca9d839856c9fd8ffe8a3a2e48cae506exe_JC.exe N/A

Processes

C:\Users\Admin\AppData\Local\Temp\6f61121924dbe1b34c6af8af8ee78528ca9d839856c9fd8ffe8a3a2e48cae506exe_JC.exe

"C:\Users\Admin\AppData\Local\Temp\6f61121924dbe1b34c6af8af8ee78528ca9d839856c9fd8ffe8a3a2e48cae506exe_JC.exe"

C:\Users\Admin\AppData\Local\Temp\6f61121924dbe1b34c6af8af8ee78528ca9d839856c9fd8ffe8a3a2e48cae506exe_JC.exe

"C:\Users\Admin\AppData\Local\Temp\6f61121924dbe1b34c6af8af8ee78528ca9d839856c9fd8ffe8a3a2e48cae506exe_JC.exe"

Network

Country Destination Domain Proto
US 8.8.8.8:53 208.194.73.20.in-addr.arpa udp
US 8.8.8.8:53 254.137.241.8.in-addr.arpa udp
US 8.8.8.8:53 68.159.190.20.in-addr.arpa udp
US 8.8.8.8:53 95.221.229.192.in-addr.arpa udp
US 8.8.8.8:53 157.123.68.40.in-addr.arpa udp
US 8.8.8.8:53 206.23.85.13.in-addr.arpa udp
US 8.8.8.8:53 11.227.111.52.in-addr.arpa udp
US 8.8.8.8:53 88.156.103.20.in-addr.arpa udp
US 8.8.8.8:53 97.238.32.23.in-addr.arpa udp
US 8.8.8.8:53 drive.google.com udp
NL 172.217.168.238:443 drive.google.com tcp
US 8.8.8.8:53 doc-08-c4-docs.googleusercontent.com udp
NL 142.251.36.1:443 doc-08-c4-docs.googleusercontent.com tcp
US 8.8.8.8:53 238.168.217.172.in-addr.arpa udp
US 8.8.8.8:53 35.36.251.142.in-addr.arpa udp
US 8.8.8.8:53 1.36.251.142.in-addr.arpa udp
US 8.8.8.8:53 25.73.42.20.in-addr.arpa udp

Files

C:\Users\Admin\AppData\Local\Temp\nsvD330.tmp\System.dll

MD5 75ed96254fbf894e42058062b4b4f0d1
SHA1 996503f1383b49021eb3427bc28d13b5bbd11977
SHA256 a632d74332b3f08f834c732a103dafeb09a540823a2217ca7f49159755e8f1d7
SHA512 58174896db81d481947b8745dafe3a02c150f3938bb4543256e8cce1145154e016d481df9fe68dac6d48407c62cbe20753320ebd5fe5e84806d07ce78e0eb0c4

memory/580-143-0x0000000077011000-0x0000000077131000-memory.dmp

memory/580-144-0x00000000744E0000-0x00000000744E6000-memory.dmp

memory/3472-145-0x0000000000400000-0x0000000001654000-memory.dmp

memory/3472-146-0x0000000077011000-0x0000000077131000-memory.dmp

memory/3472-147-0x0000000077098000-0x0000000077099000-memory.dmp

memory/3472-160-0x0000000000400000-0x0000000001654000-memory.dmp

memory/3472-161-0x0000000001660000-0x0000000004A79000-memory.dmp

memory/3472-162-0x0000000000400000-0x0000000001654000-memory.dmp

memory/3472-163-0x0000000000400000-0x0000000001654000-memory.dmp

memory/3472-164-0x0000000035120000-0x000000003546A000-memory.dmp

memory/3472-165-0x0000000001660000-0x0000000004A79000-memory.dmp

memory/3472-167-0x0000000077011000-0x0000000077131000-memory.dmp