guloader | b9d1e862b5f864aab90e418632cf973132a4b4cbe4044b1fb997d9dfbd7ad0f4

Analysis

max time kernel
120s
max time network
124s
platform
windows7_x64
resource
win7-20240221-en
resource tags

arch:x64arch:x86image:win7-20240221-enlocale:en-usos:windows7-x64system
submitted
22/04/2024, 14:18

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General

Target
04172024121853atr reteks.exe
Size 1.1MB
Sample240422-rl9mysce3v
SHA256 b9d1e862b5f864aab90e418632cf973132a4b4cbe4044b1fb997d9dfbd7ad0f4
MD5 a0e9d68e9a8541eb30d6a31cae4a942b
SHA1 3cae987132d7f45df56f77c1ff2a542cb64e64c0
SHA512 eebfe98652f6b7dffb7e57bdd73c80c073f0f1879ee8a86c17054e1e1ecc3bf5dcec66b4619944659b9038ecfca19254fec0cb60c5264d905382acc8fb0ea03a
SSDEEP 24576:c0vvQvOM6sjFYk6IuhdTuvMJbmhQU/YydIE5Ltp:clvpN2zuvMxmhB/Ylyp
MD5 SHA1 SHA512 SSDEEP

Score

10^/10

guloader downloader persistence

Malware Config

Signatures

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

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\USER\S-1-5-21-330940541-141609230-1670313778-1000\Software\Microsoft\Windows\CurrentVersion\Run\Hakkers = "%Philocaly% -windowstyle minimized $Atomlres=(Get-ItemProperty -Path 'HKCU:\\Mayst\\').Fordjelsesbesvrets;%Philocaly% ($Atomlres)"	reg.exe

Suspicious use of NtCreateThreadExHideFromDebugger 2 IoCs

pid	Process
2764	wab.exe
2764	wab.exe

Suspicious use of NtSetInformationThreadHideFromDebugger 2 IoCs

pid	Process
1648	powershell.exe
2764	wab.exe

Suspicious use of SetThreadContext 1 IoCs

description	pid	Process	procid_target
PID 1648 set thread context of 2764	1648	powershell.exe	34

Drops file in Program Files directory 1 IoCs

description	ioc	Process
File opened for modification	C:\Program Files (x86)\Common Files\Levantine.ini	04172024121853atr reteks.exe

Drops file in Windows directory 2 IoCs

description	ioc	Process
File opened for modification	C:\Windows\resources\0409\marmoreret.ini	04172024121853atr reteks.exe
File opened for modification	C:\Windows\Fonts\tashlik.ini	04172024121853atr reteks.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

T1112

pid	Process
896	reg.exe

Suspicious behavior: EnumeratesProcesses 6 IoCs

pid	Process
1648	powershell.exe
1648	powershell.exe
1648	powershell.exe
1648	powershell.exe
1648	powershell.exe
1648	powershell.exe

Suspicious behavior: MapViewOfSection 1 IoCs

pid	Process
1648	powershell.exe

Suspicious use of AdjustPrivilegeToken 1 IoCs

description	pid	Process
Token: SeDebugPrivilege	1648	powershell.exe

Suspicious use of WriteProcessMemory 22 IoCs

description	pid	Process	procid_target
PID 2868 wrote to memory of 1648	2868	04172024121853atr reteks.exe	28
PID 2868 wrote to memory of 1648	2868	04172024121853atr reteks.exe	28
PID 2868 wrote to memory of 1648	2868	04172024121853atr reteks.exe	28
PID 2868 wrote to memory of 1648	2868	04172024121853atr reteks.exe	28
PID 1648 wrote to memory of 1652	1648	powershell.exe	30
PID 1648 wrote to memory of 1652	1648	powershell.exe	30
PID 1648 wrote to memory of 1652	1648	powershell.exe	30
PID 1648 wrote to memory of 1652	1648	powershell.exe	30
PID 1648 wrote to memory of 2764	1648	powershell.exe	34
PID 1648 wrote to memory of 2764	1648	powershell.exe	34
PID 1648 wrote to memory of 2764	1648	powershell.exe	34
PID 1648 wrote to memory of 2764	1648	powershell.exe	34
PID 1648 wrote to memory of 2764	1648	powershell.exe	34
PID 1648 wrote to memory of 2764	1648	powershell.exe	34
PID 2764 wrote to memory of 2052	2764	wab.exe	35
PID 2764 wrote to memory of 2052	2764	wab.exe	35
PID 2764 wrote to memory of 2052	2764	wab.exe	35
PID 2764 wrote to memory of 2052	2764	wab.exe	35
PID 2052 wrote to memory of 896	2052	cmd.exe	37
PID 2052 wrote to memory of 896	2052	cmd.exe	37
PID 2052 wrote to memory of 896	2052	cmd.exe	37
PID 2052 wrote to memory of 896	2052	cmd.exe	37

C:\Users\Admin\AppData\Local\Temp\04172024121853atr reteks.exe
"C:\Users\Admin\AppData\Local\Temp\04172024121853atr reteks.exe"
1⤵
- Drops file in Program Files directory
- Drops file in Windows directory
- Suspicious use of WriteProcessMemory
PID:2868
- C:\Windows\SysWOW64\WindowsPowerShell\v1.0\powershell.exe
  "powershell.exe" -windowstyle hidden "$Bissede=Get-Content 'C:\Users\Admin\AppData\Local\nervier\Estampede\sipunculacean\Michelines.All';$Flumes35=$Bissede.SubString(58005,3);.$Flumes35($Bissede)"
  2⤵
  - Suspicious use of NtSetInformationThreadHideFromDebugger
  - Suspicious use of SetThreadContext
  - Suspicious behavior: EnumeratesProcesses
  - Suspicious behavior: MapViewOfSection
  - Suspicious use of AdjustPrivilegeToken
  - Suspicious use of WriteProcessMemory
  PID:1648
- - C:\Windows\SysWOW64\cmd.exe
    "C:\Windows\system32\cmd.exe" /c "set /A 1^^0"
    3⤵
    PID:1652
- - 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:2764
  - - C:\Windows\SysWOW64\cmd.exe
      "C:\Windows\System32\cmd.exe" /c REG ADD HKCU\Software\Microsoft\Windows\CurrentVersion\Run /f /v "Hakkers" /t REG_EXPAND_SZ /d "%Philocaly% -windowstyle minimized $Atomlres=(Get-ItemProperty -Path 'HKCU:\Mayst\').Fordjelsesbesvrets;%Philocaly% ($Atomlres)"
      4⤵
      Suspicious use of WriteProcessMemory
      PID:2052
    - - C:\Windows\SysWOW64\reg.exe
        
        REG ADD HKCU\Software\Microsoft\Windows\CurrentVersion\Run /f /v "Hakkers" /t REG_EXPAND_SZ /d "%Philocaly% -windowstyle minimized $Atomlres=(Get-ItemProperty -Path 'HKCU:\Mayst\').Fordjelsesbesvrets;%Philocaly% ($Atomlres)"
        5⤵
        Adds Run key to start application
        Modifies registry key
        
        PID:896

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

System Information Discovery

T1082

Lateral Movement

Collection

Command and Control

Exfiltration

Impact

Replay Monitor

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Downloads

94308059B57B3142E455B38A6EB92015

Path C:\Users\Admin\AppData\LocalLow\Microsoft\CryptnetUrlCache\Content\94308059B57B3142E455B38A6EB92015
Size 68KB
SHA256 1ed81fa8dfb6999a9fedc6e779138ffd99568992e22d300acd181a6d2c8de184
MD5 29f65ba8e88c063813cc50a4ea544e93
SHA1 05a7040d5c127e68c25d81cc51271ffb8bef3568
SHA512 e29b2e92c496245bed3372578074407e8ef8882906ce10c35b3c8deebfefe01b5fd7f3030acaa693e175f4b7aca6cd7d8d10ae1c731b09c5fa19035e005de3aa
SSDEEP 1536:iMveRG6BWC7T2g1wGUa5QUoaIB9ttiFJG+AOQOXl0Usvwr:feRG6BX6gUaHo9tkBHiUewr
MD5 SHA1 SHA512 SSDEEP

Submit Download

94308059B57B3142E455B38A6EB92015

Path C:\Users\Admin\AppData\LocalLow\Microsoft\CryptnetUrlCache\MetaData\94308059B57B3142E455B38A6EB92015
Size 344B
SHA256 9d9c3048eb1803f8b8a1b3d6284bae3b7f61723918553220aade9a049f7a0b0e
MD5 ba494e6a44b9f393ebf2bab1f66c84b0
SHA1 1d2f3457b2007f377dee4d50a1a72745562f9730
SHA512 8660b5a51df8b6487f143c192f2e9e3c78878e85fa57a06dcf17f108538d127983feaa9f7d8be864d8dd49407c880703e9c792c3274d1842ac6c184b556d74f0
MD5 SHA1 SHA512

Submit Download

Cab7C63.tmp

Path C:\Users\Admin\AppData\Local\Temp\Cab7C63.tmp
Size 65KB
SHA256 c6456e12e5e53287a547af4103e0397cb9697e466cf75844312dc296d43d144d
MD5 ac05d27423a85adc1622c714f2cb6184
SHA1 b0fe2b1abddb97837ea0195be70ab2ff14d43198
SHA512 6d0ef9050e41fbae680e0e59dd0f90b6ac7fea5579ef5708b69d5da33a0ece7e8b16574b58b17b64a34cc34a4ffc22b4a62c1ece61f36c4a11a0665e0536b90d
SSDEEP 1536:drFvD2YSE/sFDqV0FJJynkAhftCvMd3coa282frgW1qgNzU:drVDJSeaDqV0FJwLhVkr282fF5U
MD5 SHA1 SHA512 SSDEEP

Submit Download

Tar7E6C.tmp

Path C:\Users\Admin\AppData\Local\Temp\Tar7E6C.tmp
Size 177KB
SHA256 67dc37ed50b8e63272b49a254a6039ee225974f1d767bb83eb1fd80e759a7c34
MD5 435a9ac180383f9fa094131b173a2f7b
SHA1 76944ea657a9db94f9a4bef38f88c46ed4166983
SHA512 1a6b277611959720a9c71114957620517ad94541302f164eb872bd322292a952409bafb8bc2ac793b16ad5f25d83f8594ccff2b7834e3c2b2b941e6fc84c009a
SSDEEP 1536:fAo/J+lCUsTRvsqgCyqWlUDNWdm1wpSru2A0XwjY/z02DTr3rmt6mJ:f/J+qTR0XCy/dmASru2Aijbdq
MD5 SHA1 SHA512 SSDEEP

Submit Download

Indskrnkningens.Meg

Path C:\Users\Admin\AppData\Local\nervier\Estampede\sipunculacean\Indskrnkningens.Meg
Size 301KB
SHA256 592aa331c37790bb4627428385c85f843d839f2ebda2f621da438afb4edfe13d
MD5 50196fec4abccdb71d5f26eccdffb22b
SHA1 594f16df70de47019f285b72d39130885837a238
SHA512 6a547e0c03fc7748b9637fa9c90784e30c4433d09b0488882d6b6792b41188a9ae2efa39f649da596d37d1079715842df315cae8fcdaf1482a5d804737d2192c
SSDEEP 6144:Yb/IxKAMpfZpRmDUBMkrXI9cEoxygQVbw6IOr7lOFwI1EQ:g/8ERmDUmR9cEoatw6Hr7lZpQ
MD5 SHA1 SHA512 SSDEEP

Submit Download

Michelines.All

Path C:\Users\Admin\AppData\Local\nervier\Estampede\sipunculacean\Michelines.All
Size 56KB
SHA256 a03bb54517df231824d324ad20b79094efef9af20eff855e30a6f459bcc43912
MD5 82340892cba1f6e4faaa080bb634cf9c
SHA1 56b029cbcada747897e9beff7c8f1013b8c9b6ce
SHA512 dfea5297d9aef9004af38f8604e74313f99d477199e797dbeec5367ec3e6c0000a4c62eeab54425deee14de5b1adb224f09956a10619cf03b821b2b91b84f5c7
SSDEEP 1536:aY1v3JTUB3Z1un5G97KwaJx8NIodV4kIj+1S78:auBUEnY7za0NIMa+k8
MD5 SHA1 SHA512 SSDEEP

Submit Download

memory/1648-29-0x00000000061E0000-0x0000000008F36000-memory.dmp

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memory/1648-16-0x0000000074090000-0x000000007463B000-memory.dmp

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memory/1648-24-0x0000000074090000-0x000000007463B000-memory.dmp

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memory/1648-25-0x0000000002400000-0x0000000002440000-memory.dmp

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memory/1648-27-0x0000000005C60000-0x0000000005D60000-memory.dmp

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memory/1648-28-0x00000000061E0000-0x0000000008F36000-memory.dmp

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memory/1648-18-0x0000000002400000-0x0000000002440000-memory.dmp

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memory/1648-31-0x0000000077830000-0x0000000077906000-memory.dmp

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memory/1648-30-0x0000000077640000-0x00000000777E9000-memory.dmp

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memory/1648-123-0x00000000061E0000-0x0000000008F36000-memory.dmp

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memory/1648-33-0x00000000061E0000-0x0000000008F36000-memory.dmp

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memory/1648-17-0x0000000074090000-0x000000007463B000-memory.dmp

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memory/1648-23-0x0000000005030000-0x0000000005034000-memory.dmp

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memory/1648-20-0x0000000002400000-0x0000000002440000-memory.dmp

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memory/1648-21-0x0000000005C60000-0x0000000005D60000-memory.dmp

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memory/2764-36-0x0000000077830000-0x0000000077906000-memory.dmp

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memory/2764-35-0x0000000077866000-0x0000000077867000-memory.dmp

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memory/2764-34-0x0000000077640000-0x00000000777E9000-memory.dmp

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memory/2764-121-0x0000000077830000-0x0000000077906000-memory.dmp

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memory/2764-120-0x0000000001A30000-0x0000000004786000-memory.dmp

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memory/2764-32-0x0000000001A30000-0x0000000004786000-memory.dmp

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