5707159146a77ac06aa9208504823c06c98e8e899f2ed71493f453d0e4fad3b7

Analysis

max time kernel
145s
max time network
152s
platform
windows10-2004_x64
resource
win10v2004-20231222-en
resource tags

arch:x64arch:x86image:win10v2004-20231222-enlocale:en-usos:windows10-2004-x64system
submitted
03/02/2024, 00:55

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General

Target
8af84f8d39f48976448c2be647ca2789.exe
Size 84KB
Sample240203-a9tszafeem
SHA256 5707159146a77ac06aa9208504823c06c98e8e899f2ed71493f453d0e4fad3b7
MD5 8af84f8d39f48976448c2be647ca2789
SHA1 ae7a2bf8af3911bc1538ae90e5336b47d23d87b8
SHA512 588e6a4605802b9628dc8fd16bd0021252b2618159554c564d0e2459ba28e0415144ec232cc7103e8b51cd53837cff6dcbf4bc6e158d2fa3acefb1c5c4fb93cd
SSDEEP 1536:7u4nPGyZSiVVnDfSIEd6zplQosy//rNjWFMiDIPA49v05xL1godLjUEE:7fu+VDyd4ntsyhjWFLIPagk7E
MD5 SHA1 SHA512 SSDEEP

Score

7^/10

adware discovery persistence stealer upx

Malware Config

Signatures

Executes dropped EXE 1 IoCs

pid	Process
4100	PostTip.exe

Loads dropped DLL 2 IoCs

pid	Process
956	regsvr32.exe
2036	regsvr32.exe

UPX packed file 2 IoCs

Detects executables packed with UPX/modified UPX open source packer.

upx

resource	yara_rule
behavioral2/memory/236-0-0x0000000000400000-0x0000000000440000-memory.dmp	upx
behavioral2/memory/236-11-0x0000000000400000-0x0000000000440000-memory.dmp	upx

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\MACHINE\SOFTWARE\WOW6432Node\Microsoft\Windows\CurrentVersion\Run\PostTip = "C:\\Program Files (x86)\\PostTip\\PostTip.exe"	PostTip.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

Installs/modifies Browser Helper Object 2 TTPs 3 IoCs

BHOs are DLL modules which act as plugins for Internet Explorer.

stealer adware

Modify Registry

T1112

Browser Extensions

T1176

description	ioc	Process
Key created	\REGISTRY\MACHINE\SOFTWARE\WOW6432Node\Microsoft\Windows\CurrentVersion\Explorer\Browser Helper Objects\{C4BF6897-41A2-454b-AC3B-437F30BEA671}	regsvr32.exe
Key created	\REGISTRY\MACHINE\SOFTWARE\WOW6432Node\Microsoft\Windows\CurrentVersion\Explorer\Browser Helper Objects\{C4BF6897-41A2-454b-AC3B-437F30BEA671}	regsvr32.exe
Key deleted	\REGISTRY\MACHINE\SOFTWARE\WOW6432NODE\MICROSOFT\WINDOWS\CURRENTVERSION\EXPLORER\BROWSER HELPER OBJECTS\{C4BF6897-41A2-454B-AC3B-437F30BEA671}	regsvr32.exe

Drops file in Program Files directory 3 IoCs

description	ioc	Process
File created	C:\Program Files (x86)\PostTip\PostTip.exe	8af84f8d39f48976448c2be647ca2789.exe
File created	C:\Program Files (x86)\PostTip\PostTip.dll	8af84f8d39f48976448c2be647ca2789.exe
File created	C:\Program Files (x86)\PostTip\uninstall.exe	8af84f8d39f48976448c2be647ca2789.exe

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

System Information Discovery
T1082

Modifies registry class 64 IoCs

description	ioc	Process
Key created	\REGISTRY\MACHINE\SOFTWARE\Classes\WOW6432Node\CLSID\{C4BF6897-41A2-454b-AC3B-437F30BEA671}	regsvr32.exe
Key deleted	\REGISTRY\MACHINE\SOFTWARE\Classes\WOW6432Node\CLSID\{C4BF6897-41A2-454b-AC3B-437F30BEA671}\InprocServer32	regsvr32.exe
Set value (str)	\REGISTRY\MACHINE\SOFTWARE\Classes\SideTab.SideTabCtl\CurVer\ = "SideTab.SideTabCtl.1"	regsvr32.exe
Key created	\REGISTRY\MACHINE\SOFTWARE\Classes\TypeLib\{A12EF54F-2691-4C32-AC1B-F65D144A3988}\1.0\0	regsvr32.exe
Key created	\REGISTRY\MACHINE\SOFTWARE\Classes\TypeLib\{A12EF54F-2691-4C32-AC1B-F65D144A3988}\1.0\HELPDIR	regsvr32.exe
Set value (str)	\REGISTRY\MACHINE\SOFTWARE\Classes\SideTab.SideTabCtl\ = "SideTabCtl Class"	regsvr32.exe
Set value (str)	\REGISTRY\MACHINE\SOFTWARE\Classes\WOW6432Node\CLSID\{C4BF6897-41A2-454b-AC3B-437F30BEA671}\ProgID\ = "SideTab.SideTabCtl.1"	regsvr32.exe
Key created	\REGISTRY\MACHINE\SOFTWARE\Classes\SideTab.SideTabCtl.1	regsvr32.exe
Key deleted	\REGISTRY\MACHINE\SOFTWARE\Classes\WOW6432Node\CLSID\{C4BF6897-41A2-454b-AC3B-437F30BEA671}\VersionIndependentProgID	regsvr32.exe
Key created	\REGISTRY\MACHINE\SOFTWARE\Classes\SideTab.SideTabCtl	regsvr32.exe
Key created	\REGISTRY\MACHINE\SOFTWARE\Classes\WOW6432Node\CLSID\{C4BF6897-41A2-454b-AC3B-437F30BEA671}\ProgID	regsvr32.exe
Set value (str)	\REGISTRY\MACHINE\SOFTWARE\Classes\WOW6432Node\CLSID\{C4BF6897-41A2-454b-AC3B-437F30BEA671}\InprocServer32\ = "C:\\Program Files (x86)\\PostTip\\PostTip.dll"	regsvr32.exe
Set value (str)	\REGISTRY\MACHINE\SOFTWARE\Classes\TypeLib\{A12EF54F-2691-4C32-AC1B-F65D144A3988}\1.0\ = "SideTab 1.0 Type Library"	regsvr32.exe
Set value (str)	\REGISTRY\MACHINE\SOFTWARE\Classes\SideTab.SideTabCtl\CurVer\ = "SideTab.SideTabCtl.1"	regsvr32.exe
Set value (str)	\REGISTRY\MACHINE\SOFTWARE\Classes\WOW6432Node\CLSID\{C4BF6897-41A2-454b-AC3B-437F30BEA671}\InprocServer32\ = "C:\\Program Files (x86)\\PostTip\\PostTip.dll"	regsvr32.exe
Set value (str)	\REGISTRY\MACHINE\SOFTWARE\Classes\WOW6432Node\CLSID\{C4BF6897-41A2-454b-AC3B-437F30BEA671}\InprocServer32\ThreadingModel = "Apartment"	regsvr32.exe
Key created	\REGISTRY\MACHINE\SOFTWARE\Classes\SideTab.SideTabCtl\CLSID	regsvr32.exe
Set value (str)	\REGISTRY\MACHINE\SOFTWARE\Classes\WOW6432Node\CLSID\{C4BF6897-41A2-454b-AC3B-437F30BEA671}\ = "PostTip"	regsvr32.exe
Set value (str)	\REGISTRY\MACHINE\SOFTWARE\Classes\WOW6432Node\Interface\{E2B006B6-159A-4384-B05C-4B5511C16354}\ = "ISideTabCtl"	regsvr32.exe
Set value (str)	\REGISTRY\MACHINE\SOFTWARE\Classes\SideTab.SideTabCtl\ = "SideTabCtl Class"	regsvr32.exe
Key created	\REGISTRY\MACHINE\SOFTWARE\Classes\WOW6432Node\CLSID\{C4BF6897-41A2-454b-AC3B-437F30BEA671}\InprocServer32	regsvr32.exe
Key created	\REGISTRY\MACHINE\SOFTWARE\Classes\WOW6432Node\CLSID\{C4BF6897-41A2-454b-AC3B-437F30BEA671}\TypeLib	regsvr32.exe
Set value (str)	\REGISTRY\MACHINE\SOFTWARE\Classes\TypeLib\{A12EF54F-2691-4C32-AC1B-F65D144A3988}\1.0\FLAGS\ = "0"	regsvr32.exe
Set value (str)	\REGISTRY\MACHINE\SOFTWARE\Classes\Interface\{E2B006B6-159A-4384-B05C-4B5511C16354}\ProxyStubClsid32\ = "{00020424-0000-0000-C000-000000000046}"	regsvr32.exe
Key created	\REGISTRY\MACHINE\SOFTWARE\Classes\WOW6432Node\CLSID\{C4BF6897-41A2-454b-AC3B-437F30BEA671}\TypeLib	regsvr32.exe
Key created	\REGISTRY\MACHINE\SOFTWARE\Classes\WOW6432Node\CLSID\{C4BF6897-41A2-454b-AC3B-437F30BEA671}\Programmable	regsvr32.exe
Key created	\REGISTRY\MACHINE\SOFTWARE\Classes\WOW6432Node\Interface\{E2B006B6-159A-4384-B05C-4B5511C16354}\TypeLib	regsvr32.exe
Key created	\REGISTRY\MACHINE\SOFTWARE\Classes\Interface\{E2B006B6-159A-4384-B05C-4B5511C16354}\TypeLib	regsvr32.exe
Key deleted	\REGISTRY\MACHINE\SOFTWARE\Classes\WOW6432Node\CLSID\{C4BF6897-41A2-454b-AC3B-437F30BEA671}	regsvr32.exe
Key created	\REGISTRY\MACHINE\SOFTWARE\Classes\WOW6432Node\CLSID\{C4BF6897-41A2-454b-AC3B-437F30BEA671}\Programmable	regsvr32.exe
Set value (str)	\REGISTRY\MACHINE\SOFTWARE\Classes\WOW6432Node\CLSID\{C4BF6897-41A2-454b-AC3B-437F30BEA671}\VersionIndependentProgID\ = "SideTab.SideTabCtl"	regsvr32.exe
Key created	\REGISTRY\MACHINE\SOFTWARE\Classes\WOW6432Node\Interface\{E2B006B6-159A-4384-B05C-4B5511C16354}	regsvr32.exe
Key deleted	\REGISTRY\MACHINE\SOFTWARE\Classes\WOW6432Node\CLSID\{C4BF6897-41A2-454b-AC3B-437F30BEA671}\ProgID	regsvr32.exe
Key created	\REGISTRY\MACHINE\SOFTWARE\Classes\WOW6432Node\CLSID\{C4BF6897-41A2-454b-AC3B-437F30BEA671}	regsvr32.exe
Set value (str)	\REGISTRY\MACHINE\SOFTWARE\Classes\WOW6432Node\CLSID\{C4BF6897-41A2-454b-AC3B-437F30BEA671}\TypeLib\ = "{A12EF54F-2691-4C32-AC1B-F65D144A3988}"	regsvr32.exe
Set value (str)	\REGISTRY\MACHINE\SOFTWARE\Classes\SideTab.SideTabCtl.1\ = "SideTabCtl Class"	regsvr32.exe
Key created	\REGISTRY\MACHINE\SOFTWARE\Classes\SideTab.SideTabCtl.1\CLSID	regsvr32.exe
Set value (str)	\REGISTRY\MACHINE\SOFTWARE\Classes\SideTab.SideTabCtl\CLSID\ = "{C4BF6897-41A2-454b-AC3B-437F30BEA671}"	regsvr32.exe
Key created	\REGISTRY\MACHINE\SOFTWARE\Classes\WOW6432Node\Interface\{E2B006B6-159A-4384-B05C-4B5511C16354}\ProxyStubClsid32	regsvr32.exe
Set value (str)	\REGISTRY\MACHINE\SOFTWARE\Classes\Interface\{E2B006B6-159A-4384-B05C-4B5511C16354}\TypeLib\Version = "1.0"	regsvr32.exe
Key created	\REGISTRY\MACHINE\SOFTWARE\Classes\WOW6432Node\CLSID\{C4BF6897-41A2-454b-AC3B-437F30BEA671}\ProgID	regsvr32.exe
Key created	\REGISTRY\MACHINE\SOFTWARE\Classes\SideTab.SideTabCtl\CurVer	regsvr32.exe
Key created	\REGISTRY\MACHINE\SOFTWARE\Classes\TypeLib\{A12EF54F-2691-4C32-AC1B-F65D144A3988}	regsvr32.exe
Key created	\REGISTRY\MACHINE\SOFTWARE\Classes\Interface\{E2B006B6-159A-4384-B05C-4B5511C16354}\ProxyStubClsid32	regsvr32.exe
Set value (str)	\REGISTRY\MACHINE\SOFTWARE\Classes\SideTab.SideTabCtl.1\ = "SideTabCtl Class"	regsvr32.exe
Key deleted	\REGISTRY\MACHINE\SOFTWARE\Classes\WOW6432Node\CLSID\{C4BF6897-41A2-454b-AC3B-437F30BEA671}\TypeLib	regsvr32.exe
Key created	\REGISTRY\MACHINE\SOFTWARE\Classes\WOW6432Node\CLSID\{C4BF6897-41A2-454b-AC3B-437F30BEA671}\VersionIndependentProgID	regsvr32.exe
Key created	\REGISTRY\MACHINE\SOFTWARE\Classes\TypeLib\{A12EF54F-2691-4C32-AC1B-F65D144A3988}\1.0\FLAGS	regsvr32.exe
Key created	\REGISTRY\MACHINE\SOFTWARE\Classes\TypeLib\{A12EF54F-2691-4C32-AC1B-F65D144A3988}\1.0\0\win32	regsvr32.exe
Set value (str)	\REGISTRY\MACHINE\SOFTWARE\Classes\TypeLib\{A12EF54F-2691-4C32-AC1B-F65D144A3988}\1.0\0\win32\ = "C:\\Program Files (x86)\\PostTip\\PostTip.dll"	regsvr32.exe
Set value (str)	\REGISTRY\MACHINE\SOFTWARE\Classes\TypeLib\{A12EF54F-2691-4C32-AC1B-F65D144A3988}\1.0\HELPDIR\ = "C:\\Program Files (x86)\\PostTip\\"	regsvr32.exe
Set value (str)	\REGISTRY\MACHINE\SOFTWARE\Classes\Interface\{E2B006B6-159A-4384-B05C-4B5511C16354}\ = "ISideTabCtl"	regsvr32.exe
Set value (str)	\REGISTRY\MACHINE\SOFTWARE\Classes\SideTab.SideTabCtl.1\CLSID\ = "{C4BF6897-41A2-454b-AC3B-437F30BEA671}"	regsvr32.exe
Key created	\REGISTRY\MACHINE\SOFTWARE\Classes\WOW6432Node\CLSID\{C4BF6897-41A2-454b-AC3B-437F30BEA671}\VersionIndependentProgID	regsvr32.exe
Set value (str)	\REGISTRY\MACHINE\SOFTWARE\Classes\SideTab.SideTabCtl\CLSID\ = "{C4BF6897-41A2-454b-AC3B-437F30BEA671}"	regsvr32.exe
Set value (str)	\REGISTRY\MACHINE\SOFTWARE\Classes\WOW6432Node\CLSID\{C4BF6897-41A2-454b-AC3B-437F30BEA671}\ = "PostTip"	regsvr32.exe
Set value (str)	\REGISTRY\MACHINE\SOFTWARE\Classes\WOW6432Node\CLSID\{C4BF6897-41A2-454b-AC3B-437F30BEA671}\VersionIndependentProgID\ = "SideTab.SideTabCtl"	regsvr32.exe
Set value (str)	\REGISTRY\MACHINE\SOFTWARE\Classes\WOW6432Node\CLSID\{C4BF6897-41A2-454b-AC3B-437F30BEA671}\InprocServer32\ThreadingModel = "Apartment"	regsvr32.exe
Key created	\REGISTRY\MACHINE\SOFTWARE\Classes\TypeLib\{A12EF54F-2691-4C32-AC1B-F65D144A3988}\1.0	regsvr32.exe
Set value (str)	\REGISTRY\MACHINE\SOFTWARE\Classes\WOW6432Node\Interface\{E2B006B6-159A-4384-B05C-4B5511C16354}\TypeLib\ = "{A12EF54F-2691-4C32-AC1B-F65D144A3988}"	regsvr32.exe
Set value (str)	\REGISTRY\MACHINE\SOFTWARE\Classes\Interface\{E2B006B6-159A-4384-B05C-4B5511C16354}\TypeLib\ = "{A12EF54F-2691-4C32-AC1B-F65D144A3988}"	regsvr32.exe
Key deleted	\REGISTRY\MACHINE\SOFTWARE\Classes\WOW6432Node\CLSID\{C4BF6897-41A2-454b-AC3B-437F30BEA671}\Programmable	regsvr32.exe
Set value (str)	\REGISTRY\MACHINE\SOFTWARE\Classes\WOW6432Node\CLSID\{C4BF6897-41A2-454b-AC3B-437F30BEA671}\TypeLib\ = "{A12EF54F-2691-4C32-AC1B-F65D144A3988}"	regsvr32.exe
Set value (str)	\REGISTRY\MACHINE\SOFTWARE\Classes\WOW6432Node\Interface\{E2B006B6-159A-4384-B05C-4B5511C16354}\ProxyStubClsid32\ = "{00020424-0000-0000-C000-000000000046}"	regsvr32.exe

Suspicious behavior: EnumeratesProcesses 2 IoCs

pid	Process
236	8af84f8d39f48976448c2be647ca2789.exe
236	8af84f8d39f48976448c2be647ca2789.exe

Suspicious use of SetWindowsHookEx 4 IoCs

pid	Process
236	8af84f8d39f48976448c2be647ca2789.exe
236	8af84f8d39f48976448c2be647ca2789.exe
4100	PostTip.exe
4100	PostTip.exe

Suspicious use of WriteProcessMemory 12 IoCs

description	pid	Process	procid_target
PID 236 wrote to memory of 956	236	8af84f8d39f48976448c2be647ca2789.exe	55
PID 236 wrote to memory of 956	236	8af84f8d39f48976448c2be647ca2789.exe	55
PID 236 wrote to memory of 956	236	8af84f8d39f48976448c2be647ca2789.exe	55
PID 236 wrote to memory of 4100	236	8af84f8d39f48976448c2be647ca2789.exe	89
PID 236 wrote to memory of 4100	236	8af84f8d39f48976448c2be647ca2789.exe	89
PID 236 wrote to memory of 4100	236	8af84f8d39f48976448c2be647ca2789.exe	89
PID 236 wrote to memory of 1152	236	8af84f8d39f48976448c2be647ca2789.exe	90
PID 236 wrote to memory of 1152	236	8af84f8d39f48976448c2be647ca2789.exe	90
PID 236 wrote to memory of 1152	236	8af84f8d39f48976448c2be647ca2789.exe	90
PID 4100 wrote to memory of 2036	4100	PostTip.exe	92
PID 4100 wrote to memory of 2036	4100	PostTip.exe	92
PID 4100 wrote to memory of 2036	4100	PostTip.exe	92

C:\Users\Admin\AppData\Local\Temp\8af84f8d39f48976448c2be647ca2789.exe
"C:\Users\Admin\AppData\Local\Temp\8af84f8d39f48976448c2be647ca2789.exe"
1⤵
- Drops file in Program Files directory
- Suspicious behavior: EnumeratesProcesses
- Suspicious use of SetWindowsHookEx
- Suspicious use of WriteProcessMemory
PID:236
- C:\Windows\SysWOW64\regsvr32.exe
  regsvr32 /s "C:\Program Files (x86)\PostTip\PostTip.dll"
  2⤵
  - Loads dropped DLL
  - Installs/modifies Browser Helper Object
  - Modifies registry class
  PID:956
- C:\Program Files (x86)\PostTip\PostTip.exe
  "C:\Program Files (x86)\PostTip\PostTip.exe"
  2⤵
  - Executes dropped EXE
  - Adds Run key to start application
  - Suspicious use of SetWindowsHookEx
  - Suspicious use of WriteProcessMemory
  PID:4100
- - C:\Windows\SysWOW64\regsvr32.exe
    regsvr32 /s "C:\Program Files (x86)\PostTip\PostTip.dll"
    3⤵
    - Loads dropped DLL
    - Installs/modifies Browser Helper Object
    - Modifies registry class
    PID:2036
- C:\Windows\SysWOW64\cmd.exe
  C:\Windows\system32\cmd.exe /c \DelUS.bat
  2⤵
  PID:1152

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

Browser Extensions

T1176

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

Replay Monitor

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Downloads

DelUS.bat

Path C:\DelUS.bat
Size 243B
SHA256 00a3bf098a218da362bcf30b4872fe7acb110d38a04416af2bb09112ae3d3eca
MD5 69c77dbfa72ea72a0685a2805be46417
SHA1 76c64d7e66df0fc037ffc9012f7aec29fb2770e5
SHA512 6c96f37f74992e868792d9b9885c3797f998380f5a2fd0fd5026c3dbc9a47086cfaad54faf8cec7016edabc4cca2170dd67e25eda27d2d3d579028b447bf706f
MD5 SHA1 SHA512

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PostTip.dll

Path C:\Program Files (x86)\PostTip\PostTip.dll
Size 134KB
SHA256 67480ded5f5106afa45e43492b1e89f22c06d8098ae0c95cbf2195a01504ae35
MD5 facfc57cee78b81964939199b2aa3c80
SHA1 22d705937ca6c50d5aabc41c231b69cb04242c44
SHA512 ae19cde49bac5f18bf9e2ce099f4e83c8352e38c0cdea4e202a55386d7dfe35b0a475eec6933ece632c5eaa7c180e206e689cb62f6b84863fd49249e51d6bfcb
SSDEEP 3072:KI+htt1cWMpBxQzy15Mo7by8ijwzaonXbwB:KFwBCho7ywzambw
MD5 SHA1 SHA512 SSDEEP

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PostTip.exe

Path C:\Program Files (x86)\PostTip\PostTip.exe
Size 38KB
SHA256 bbca9f25345ef57a8a286a4bfbb2b0f67bee705e308de4ea3b0fdfb7ec95ceb7
MD5 cf73d6f265898fce842248305dd48820
SHA1 439c07662d5d35642dabb7a91dbe1597070cc4d2
SHA512 9139f99a4b2af8168951767aa492d4b5b2497d3f568967a13c1bd13c3a363b9c1298b0669289c0f8872b232998a057e2013bf2667c824dc3100a044df4312b64
SSDEEP 384:j+tB3LvVwIvdKNMow7lhNBg8EbNgN1qCeEWWEYJLuPkCQu:joB3j7dKmow7lTBg8igzqOWWpLuD
MD5 SHA1 SHA512 SSDEEP

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memory/236-0-0x0000000000400000-0x0000000000440000-memory.dmp

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memory/236-11-0x0000000000400000-0x0000000000440000-memory.dmp

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