guloader | d2473f318c1386699bdd8442cfe5455d44e18ec23d4b2482ffc82c7c227ab9ad

Analysis

max time kernel
146s
max time network
150s
platform
windows10-2004_x64
resource
win10v2004-20241007-en
resource tags

arch:x64arch:x86image:win10v2004-20241007-enlocale:en-usos:windows10-2004-x64system
submitted
12-11-2024 06:36

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General

Target

Calyciform.exe
Size

418KB
MD5

0b813c3349387a69277d7f8a0d20fe3d
SHA1

d0c4aa5fffba33d1f7c9c184cd3acb90f6a75650
SHA256

d2473f318c1386699bdd8442cfe5455d44e18ec23d4b2482ffc82c7c227ab9ad
SHA512

d3b46abc8583f2a12c4e202392e97679147c5d1a691e1525bcf771f89902902740e503f5856574c5e7b8ad1303036485193f48f989201cf25a1ca08c79dc8c34
SSDEEP

12288:F4FAe+jtbt1JcAfGWpfnuayZzCeFPEG6w//j:YAe+jtbt1JcAlnnGC+R/j

Score

10^/10

guloader discovery downloader

Malware Config

Signatures

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

Checks QEMU agent file 2 TTPs 2 IoCs

Checks presence of QEMU agent, possibly to detect virtualization.

Query Registry

T1012

System Information Discovery

T1082

Processes:

Calyciform.exeCalyciform.exe

description	ioc	process
File opened (read-only)	C:\Program Files\Qemu-ga\qemu-ga.exe	Calyciform.exe
File opened (read-only)	C:\Program Files\Qemu-ga\qemu-ga.exe	Calyciform.exe

Loads dropped DLL 2 IoCs

Processes:

Calyciform.exe

pid process

2884 Calyciform.exe
2884 Calyciform.exe
Checks installed software on the system 1 TTPs
Looks up Uninstall key entries in the registry to enumerate software on the system.
discovery

Query Registry
T1012
Drops file in System32 directory 1 IoCs

Processes:

Calyciform.exe

description ioc process

File opened for modification C:\Windows\SysWOW64\Ever\Simplifikationens137\Kommandokarakterer.ini Calyciform.exe
Suspicious use of NtSetInformationThreadHideFromDebugger 2 IoCs

Processes:

Calyciform.exeCalyciform.exe

pid process

2884 Calyciform.exe
3888 Calyciform.exe
Suspicious use of SetThreadContext 1 IoCs

Processes:

Calyciform.exe

description pid process target process

PID 2884 set thread context of 3888 2884 Calyciform.exe Calyciform.exe
Drops file in Windows directory 1 IoCs

Processes:

Calyciform.exe

description ioc process

File opened for modification C:\Windows\Fonts\Illustreringers\Oogametes.Rud Calyciform.exe
Enumerates physical storage devices 1 TTPs
Attempts to interact with connected storage/optical drive(s).

System Information Discovery
T1082

pid	process
2884	Calyciform.exe
2884	Calyciform.exe

description	ioc	process
File opened for modification	C:\Windows\SysWOW64\Ever\Simplifikationens137\Kommandokarakterer.ini	Calyciform.exe

pid	process
2884	Calyciform.exe
3888	Calyciform.exe

description	pid	process	target process
PID 2884 set thread context of 3888	2884	Calyciform.exe	Calyciform.exe

description	ioc	process
File opened for modification	C:\Windows\Fonts\Illustreringers\Oogametes.Rud	Calyciform.exe

System Location Discovery: System Language Discovery 1 TTPs 2 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

Processes:

Calyciform.exeCalyciform.exe

description	ioc	process
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	Calyciform.exe
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	Calyciform.exe

Suspicious behavior: MapViewOfSection 1 IoCs

Processes:

Calyciform.exe

pid process

2884 Calyciform.exe

pid	process
2884	Calyciform.exe

Suspicious use of WriteProcessMemory 4 IoCs

Processes:

Calyciform.exe

description	pid	process	target process
PID 2884 wrote to memory of 3888	2884	Calyciform.exe	Calyciform.exe
PID 2884 wrote to memory of 3888	2884	Calyciform.exe	Calyciform.exe
PID 2884 wrote to memory of 3888	2884	Calyciform.exe	Calyciform.exe
PID 2884 wrote to memory of 3888	2884	Calyciform.exe	Calyciform.exe

C:\Users\Admin\AppData\Local\Temp\Calyciform.exe
"C:\Users\Admin\AppData\Local\Temp\Calyciform.exe"
1⤵
- Checks QEMU agent file
- Loads dropped DLL
- Drops file in System32 directory
- Suspicious use of NtSetInformationThreadHideFromDebugger
- Suspicious use of SetThreadContext
- Drops file in Windows directory
- System Location Discovery: System Language Discovery
- Suspicious behavior: MapViewOfSection
- Suspicious use of WriteProcessMemory
PID:2884
- C:\Users\Admin\AppData\Local\Temp\Calyciform.exe
  "C:\Users\Admin\AppData\Local\Temp\Calyciform.exe"
  2⤵
  - Checks QEMU agent file
  - Suspicious use of NtSetInformationThreadHideFromDebugger
  - System Location Discovery: System Language Discovery
  PID:3888

Network

MITRE ATT&CK Enterprise v15

Reconnaissance

Resource Development

Initial Access

Execution

Persistence

Privilege Escalation

Defense Evasion

Credential Access

Discovery

Query Registry

T1012

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

C:\Users\Admin\AppData\Local\Temp\nstCE3E.tmp\System.dll

Filesize
11KB

MD5
b0c77267f13b2f87c084fd86ef51ccfc

SHA1
f7543f9e9b4f04386dfbf33c38cbed1bf205afb3

SHA256
a0cac4cf4852895619bc7743ebeb89f9e4927ccdb9e66b1bcd92a4136d0f9c77

SHA512
f2b57a2eea00f52a3c7080f4b5f2bb85a7a9b9f16d12da8f8ff673824556c62a0f742b72be0fd82a2612a4b6dbd7e0fdc27065212da703c2f7e28d199696f66e

Download Submit
memory/2884-14-0x0000000002F00000-0x0000000003DC6000-memory.dmp

Filesize
14.8MB

Download
memory/2884-15-0x0000000077471000-0x0000000077591000-memory.dmp

Filesize
1.1MB

Download
memory/2884-16-0x0000000074164000-0x0000000074165000-memory.dmp

Filesize
4KB

Download
memory/2884-19-0x0000000002F00000-0x0000000003DC6000-memory.dmp

Filesize
14.8MB

Download
memory/3888-17-0x0000000000400000-0x0000000001654000-memory.dmp

Filesize
18.3MB

Download
memory/3888-18-0x0000000001660000-0x0000000002526000-memory.dmp

Filesize
14.8MB

Download
memory/3888-20-0x00000000774F8000-0x00000000774F9000-memory.dmp

Filesize
4KB

Download
memory/3888-21-0x0000000001660000-0x0000000002526000-memory.dmp

Filesize
14.8MB

Download
memory/3888-22-0x0000000000400000-0x0000000001654000-memory.dmp

Filesize
18.3MB

Download
memory/3888-23-0x0000000077471000-0x0000000077591000-memory.dmp

Filesize
1.1MB

Download