guloader | 21773cea42a57dff11a05f01ea94f48fc457871b110a410e4ccb416a4e346229 | Triage

Analysis

max time kernel
121s
max time network
129s
platform
windows7_x64
resource
win7-20240221-en
resource tags

arch:x64arch:x86image:win7-20240221-enlocale:en-usos:windows7-x64system
submitted
10/05/2024, 07:41

Sharing

Report Analysis Logs

General

Target

ISFFORM HBLDRAFTTHBL53164US7272Coscoline.exe
Size

632KB
MD5

051bd135f8be9f0dd2ef45a9918441f8
SHA1

d60f44452664f2f82cdd5c023795589611977446
SHA256

21773cea42a57dff11a05f01ea94f48fc457871b110a410e4ccb416a4e346229
SHA512

bf029bde10505c6061a2a183e3d460a9c68e8564b71c41d89b5a0b8a2bbd5f9f8d8b9f20150623b9611af5f56256841eb924f04d473e4d8d8cea7609fb5eb5a0
SSDEEP

12288:L2KmM4kx4NDiGYaasscxBh9GvLj8y3u8DehE3S/0kBrs4CGLx4:L2KU5tauxSLj8y3RKhGbkBN9Lm

Score

10^/10

guloader downloader execution persistence

Malware Config

Signatures

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

Command and Scripting Interpreter: PowerShell 1 TTPs 1 IoCs

Run Powershell and hide display window.

PowerShell

pid	Process
2032	powershell.exe

Adds Run key to start application 2 TTPs 1 IoCs

Registry Run Keys / Startup Folder

Modify Registry

description	ioc	Process
Set value (str)	\REGISTRY\USER\S-1-5-21-330940541-141609230-1670313778-1000\Software\Microsoft\Windows\CurrentVersion\Run\Startup key = "%Chindi216% -windowstyle minimized $Chewink=(Get-ItemProperty -Path 'HKCU:\\Nubblier\\').Murings;%Chindi216% ($Chewink)"	reg.exe

Drops file in System32 directory 1 IoCs

description	ioc	Process
File opened for modification	C:\Windows\SysWOW64\alliterates.ini	ISFFORM HBLDRAFTTHBL53164US7272Coscoline.exe

Suspicious use of NtCreateThreadExHideFromDebugger 2 IoCs

pid	Process
2640	wab.exe
2640	wab.exe

Suspicious use of NtSetInformationThreadHideFromDebugger 2 IoCs

pid	Process
2032	powershell.exe
2640	wab.exe

Suspicious use of SetThreadContext 1 IoCs

description	pid	Process	procid_target
PID 2032 set thread context of 2640	2032	powershell.exe	35

Drops file in Program Files directory 2 IoCs

description	ioc	Process
File opened for modification	C:\Program Files (x86)\Voksvrks197.ini	ISFFORM HBLDRAFTTHBL53164US7272Coscoline.exe
File opened for modification	C:\Program Files (x86)\Common Files\skurestribe.ini	ISFFORM HBLDRAFTTHBL53164US7272Coscoline.exe

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

System Information Discovery
T1082

Modifies registry key 1 TTPs 1 IoCs

Modify Registry

pid	Process
2524	reg.exe

Suspicious behavior: EnumeratesProcesses 8 IoCs

pid	Process
2032	powershell.exe
2032	powershell.exe
2032	powershell.exe
2032	powershell.exe
2032	powershell.exe
2032	powershell.exe
2032	powershell.exe
2032	powershell.exe

Suspicious behavior: MapViewOfSection 1 IoCs

pid	Process
2032	powershell.exe

Suspicious use of AdjustPrivilegeToken 1 IoCs

description	pid	Process
Token: SeDebugPrivilege	2032	powershell.exe

Suspicious use of WriteProcessMemory 22 IoCs

description	pid	Process	procid_target
PID 2228 wrote to memory of 2032	2228	ISFFORM HBLDRAFTTHBL53164US7272Coscoline.exe	30
PID 2228 wrote to memory of 2032	2228	ISFFORM HBLDRAFTTHBL53164US7272Coscoline.exe	30
PID 2228 wrote to memory of 2032	2228	ISFFORM HBLDRAFTTHBL53164US7272Coscoline.exe	30
PID 2228 wrote to memory of 2032	2228	ISFFORM HBLDRAFTTHBL53164US7272Coscoline.exe	30
PID 2032 wrote to memory of 656	2032	powershell.exe	33
PID 2032 wrote to memory of 656	2032	powershell.exe	33
PID 2032 wrote to memory of 656	2032	powershell.exe	33
PID 2032 wrote to memory of 656	2032	powershell.exe	33
PID 2032 wrote to memory of 2640	2032	powershell.exe	35
PID 2032 wrote to memory of 2640	2032	powershell.exe	35
PID 2032 wrote to memory of 2640	2032	powershell.exe	35
PID 2032 wrote to memory of 2640	2032	powershell.exe	35
PID 2032 wrote to memory of 2640	2032	powershell.exe	35
PID 2032 wrote to memory of 2640	2032	powershell.exe	35
PID 2640 wrote to memory of 2860	2640	wab.exe	36
PID 2640 wrote to memory of 2860	2640	wab.exe	36
PID 2640 wrote to memory of 2860	2640	wab.exe	36
PID 2640 wrote to memory of 2860	2640	wab.exe	36
PID 2860 wrote to memory of 2524	2860	cmd.exe	38
PID 2860 wrote to memory of 2524	2860	cmd.exe	38
PID 2860 wrote to memory of 2524	2860	cmd.exe	38
PID 2860 wrote to memory of 2524	2860	cmd.exe	38

C:\Users\Admin\AppData\Local\Temp\ISFFORM HBLDRAFTTHBL53164US7272Coscoline.exe
"C:\Users\Admin\AppData\Local\Temp\ISFFORM HBLDRAFTTHBL53164US7272Coscoline.exe"
1⤵
- Drops file in System32 directory
- Drops file in Program Files directory
- Suspicious use of WriteProcessMemory
PID:2228
- C:\Windows\SysWOW64\WindowsPowerShell\v1.0\powershell.exe
  "powershell.exe" -windowstyle hidden "$Forhrsleder=Get-Content 'C:\Users\Admin\AppData\Local\Temp\semiconventionally\mast\halvas\Pseudoaconitine210\Lavishment\Bifilar.For';$Nordamerikaner=$Forhrsleder.SubString(3576,3);.$Nordamerikaner($Forhrsleder)"
  2⤵
  - Command and Scripting Interpreter: PowerShell
  - Suspicious use of NtSetInformationThreadHideFromDebugger
  - Suspicious use of SetThreadContext
  - Suspicious behavior: EnumeratesProcesses
  - Suspicious behavior: MapViewOfSection
  - Suspicious use of AdjustPrivilegeToken
  - Suspicious use of WriteProcessMemory
  PID:2032
- - C:\Windows\SysWOW64\cmd.exe
    "C:\Windows\system32\cmd.exe" "/c set /A 1^^0"
    3⤵
    PID:656
- - C:\Program Files (x86)\windows mail\wab.exe
    "C:\Program Files (x86)\windows mail\wab.exe"
    3⤵
    - Suspicious use of NtCreateThreadExHideFromDebugger
    - Suspicious use of NtSetInformationThreadHideFromDebugger
    - Suspicious use of WriteProcessMemory
    PID:2640
  - - C:\Windows\SysWOW64\cmd.exe
      "C:\Windows\System32\cmd.exe" /c REG ADD HKCU\Software\Microsoft\Windows\CurrentVersion\Run /f /v "Startup key" /t REG_EXPAND_SZ /d "%Chindi216% -windowstyle minimized $Chewink=(Get-ItemProperty -Path 'HKCU:\Nubblier\').Murings;%Chindi216% ($Chewink)"
      4⤵
      Suspicious use of WriteProcessMemory
      PID:2860
    - - C:\Windows\SysWOW64\reg.exe
        
        REG ADD HKCU\Software\Microsoft\Windows\CurrentVersion\Run /f /v "Startup key" /t REG_EXPAND_SZ /d "%Chindi216% -windowstyle minimized $Chewink=(Get-ItemProperty -Path 'HKCU:\Nubblier\').Murings;%Chindi216% ($Chewink)"
        5⤵
        Adds Run key to start application
        Modifies registry key
        
        PID:2524

Network

MITRE ATT&CK Enterprise v15

Reconnaissance

Resource Development

Initial Access

Execution

Command and Scripting Interpreter

PowerShell

Persistence

Boot or Logon Autostart Execution

Registry Run Keys / Startup Folder

Privilege Escalation

Boot or Logon Autostart Execution

Registry Run Keys / Startup Folder

Defense Evasion

Modify Registry

Credential Access

Discovery

System Information Discovery

Lateral Movement

Collection

Command and Control

Exfiltration

Impact

Replay Monitor

Loading Replay Monitor...

Downloads

C:\Users\Admin\AppData\LocalLow\Microsoft\CryptnetUrlCache\Content\94308059B57B3142E455B38A6EB92015

Filesize
68KB

MD5
29f65ba8e88c063813cc50a4ea544e93

SHA1
05a7040d5c127e68c25d81cc51271ffb8bef3568

SHA256
1ed81fa8dfb6999a9fedc6e779138ffd99568992e22d300acd181a6d2c8de184

SHA512
e29b2e92c496245bed3372578074407e8ef8882906ce10c35b3c8deebfefe01b5fd7f3030acaa693e175f4b7aca6cd7d8d10ae1c731b09c5fa19035e005de3aa

Download Submit
C:\Users\Admin\AppData\LocalLow\Microsoft\CryptnetUrlCache\MetaData\94308059B57B3142E455B38A6EB92015

Filesize
344B

MD5
7506ee619313c1b187ba2b589da2f3c2

SHA1
c5c9b67f5e0ebb61d2309b43ca2829c2a3669dd9

SHA256
8118e05ba680d6e891120c125ce32e3494e882c60e64f7e1a87ff0148f45bba8

SHA512
cb7eecd7f809c469f3a8a9a858739241683d774123594226ea99881e96435ddbb859a66cfb289dc2d199e8f496eda1b910262ca57c1e9955f95ebb9670fefb06

Download Submit
C:\Users\Admin\AppData\Local\Temp\Cab402E.tmp

Filesize
65KB

MD5
ac05d27423a85adc1622c714f2cb6184

SHA1
b0fe2b1abddb97837ea0195be70ab2ff14d43198

SHA256
c6456e12e5e53287a547af4103e0397cb9697e466cf75844312dc296d43d144d

SHA512
6d0ef9050e41fbae680e0e59dd0f90b6ac7fea5579ef5708b69d5da33a0ece7e8b16574b58b17b64a34cc34a4ffc22b4a62c1ece61f36c4a11a0665e0536b90d

Download Submit
C:\Users\Admin\AppData\Local\Temp\Tar41E9.tmp

Filesize
177KB

MD5
435a9ac180383f9fa094131b173a2f7b

SHA1
76944ea657a9db94f9a4bef38f88c46ed4166983

SHA256
67dc37ed50b8e63272b49a254a6039ee225974f1d767bb83eb1fd80e759a7c34

SHA512
1a6b277611959720a9c71114957620517ad94541302f164eb872bd322292a952409bafb8bc2ac793b16ad5f25d83f8594ccff2b7834e3c2b2b941e6fc84c009a

Download Submit
C:\Users\Admin\AppData\Local\Temp\semiconventionally\mast\halvas\Pseudoaconitine210\Lavishment\Bifilar.For

Filesize
49KB

MD5
dbd3fd0062c83fc1a96c9eb8f084ea63

SHA1
40f1ea618b83948dfd62c5c9169c2699dea936c8

SHA256
22964b08e64845d9c0c0f415b92e999db4a9415c241603ee21777e3c7237b331

SHA512
a9a138101e377f85028058fb33b8daa6b8e0c2f745237a2bcfab1ab4eed4e6569cfabe486e223c4c6e22395bcad800fb2539065f8d867a53dbdb3c6b71dccf0f

Download Submit
C:\Users\Admin\AppData\Local\Temp\semiconventionally\mast\halvas\Pseudoaconitine210\Lysbehandlinger.Tra

Filesize
331KB

MD5
7474345d44c52bde48e3f0aab7054ad2

SHA1
18316682d3e4fdcdd5806e08d6f6ddc468000bf7

SHA256
83214f0682a536093cd9730db0725dd3782a45253e5f38bfccaf43fbff3d98b5

SHA512
ffb21dcfac730bf14b9fd3eb5429a588f6d794d5d368e4ae7da4d8e880916fce9c045b62d0db35c663a34a7277e4df2cf9eed3e2e737682d4a3a62680adbc7bd

Download Submit
memory/2032-65-0x0000000074570000-0x0000000074B1B000-memory.dmp

Filesize
5.7MB

Download
memory/2032-69-0x0000000074570000-0x0000000074B1B000-memory.dmp

Filesize
5.7MB

Download
memory/2032-68-0x0000000074570000-0x0000000074B1B000-memory.dmp

Filesize
5.7MB

Download
memory/2032-71-0x0000000074570000-0x0000000074B1B000-memory.dmp

Filesize
5.7MB

Download
memory/2032-72-0x0000000074570000-0x0000000074B1B000-memory.dmp

Filesize
5.7MB

Download
memory/2032-73-0x0000000006280000-0x0000000008247000-memory.dmp

Filesize
31.8MB

Download
memory/2032-61-0x0000000074571000-0x0000000074572000-memory.dmp

Filesize
4KB

Download
memory/2032-64-0x0000000074570000-0x0000000074B1B000-memory.dmp

Filesize
5.7MB

Download
memory/2032-63-0x0000000074570000-0x0000000074B1B000-memory.dmp

Filesize
5.7MB

Download
memory/2032-62-0x0000000074570000-0x0000000074B1B000-memory.dmp

Filesize
5.7MB

Download
memory/2640-75-0x0000000000C30000-0x0000000001C92000-memory.dmp

Filesize
16.4MB

Download
memory/2640-170-0x0000000001CA0000-0x0000000003C67000-memory.dmp

Filesize
31.8MB

Download